The Wavelength will be higher than what will be heard without any motion on the boat due to the Doppler Effect, which is the change in the frequency of a sound wave whenever there's a relative motion between the source of the wave and observer. The amount of shift in frequency depends on the speed of the source towards the observer; the higher the velocity of the source, the higher the shift.
Doppler effect is the shift in frequency as the object gets near an object/person or far away from an object or person.
When the frequency of a police car is heard from far away, the frequency is low and long wave lengths
When the frequency of a police car is heard from near, the frequency is high and short-wave lengths
Therefore, the Doppler effect is observed when the distance between
the source and the observer is changing.
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A bowler uses a lane with a coefficient of kinetic friction of 0.211. The bowler releases her 5.20 kg bowling ball with a translational speed of 2.35 m/s. At the moment of release, the ball is not rotating. As the ball slides, it begins to rotate.
What is the work nc done by friction on the ball before it transitions to rolling without slipping? Use =9.81 m/s2 for the acceleration due to gravity.
The work done by friction on the ball before it transitions to rolling without slipping is 7.04 J.
What is the final velocity of the bowling ball?
The final velocity of the bowling ball is calculated by applying the principle of conservation of angular momentum as follows;
Li = Lf
mv₁r = mv₂r + Iω
where;
I is the moment of inertia of the bowlω is the angular velocity of the ballv₁ is the initial velocity of the ballv₂ is the final velocity of the ballmv₁r = mv₂r + (²/₅mr²)ω
mv₁r = mv₂r + (²/₅mr²)(v₂/r)
mv₁r = mv₂r + (²/₅mr)(v₂)
r(mv₁) = r(mv₂ + ²/₅mv₂)
mv₁ = mv₂ + ²/₅mv₂
v₁ = v₂ + ²/₅v₂
v₁ = 7v₂/5
7v₂ = 5v₁
v₂ = 5v₁/7
v₂ = (5 x 2.35 m/s)/7
v₂ = 1.678 m/s
The work done by friction on the ball before it transitions to rolling without slipping is calculated as follows;
work done by friction = change in kinetic energy of ball
ΔK.E = ¹/₂m(v₂² - v₁²)
ΔK.E = ¹/₂ x 5.2(1.678² - 2.35²)
ΔK.E = -7.04 J
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Answer:
-7.03266 N
Explanation:
Work = Final kinetic energy - initial kinetic energy
[tex]W_{nc} = K_{f} - K_{i}[/tex]
Finding initial kinetic energy:
[tex]K_{i}=\frac{1}{2}mv^{2}= \frac{1}{2}(5.2)(2.35)^{2}=14.3585\\[/tex]
Finding final kinetic energy:
We have mass, but don't have final velocity. Have to find [tex]v_{f}[/tex] next.
We can use the kinematics equation combined with the fωorce equation. The force that slow the ball down is friction force. [tex]v_{f}=v_{0}+at=v_{0}+\frac{F}{m}t=v_{0}-\frac{f}{m}t[/tex]
Finding f/m
f=μmg ⇒ (f/m)=μg=0.211(9.81)=2.06991
Plug that back into the equation
[tex]v_{f}=2.35-2.06991t[/tex]
Now to find time, we can use angular velocity
τ=fR and α=τ/I and [tex]I=\frac{2}{5}MR^{2}[/tex], so [tex]\alpha =\frac{fR}{\frac{2}{5} MR^{2}}=\frac{5ug}{2R}[/tex]
ω=αt=(5μg)(t)/(2R)=5.174775(t/R)
v=rω=5.174775t
Therefore, [tex]v_{f}=2.35-2.06991t=5.174775t[/tex]
t=0.32437
Plug time back into the v_f equation.
[tex]v_{f}=2.35-2.06991(0.32437)=1.67858[/tex]
Plug v_f back into the K_f equation
[tex]K_{f}=\frac{1}{2}mv^{2}= \frac{1}{2}(5.2)(1.67858)^{2}=7.32584[/tex]
Work done by friction
[tex]W_{nc} = K_{f} - K_{i}=7.32584-14.3585=-7.03266[/tex]
what is the minimum angular spread of a 633-nm wavelength he-ne laser beam that is originally 1.00 mm in diameter? (answer in degrees)
The diffraction-induced minimum angular spread is 633 10 9 meters.
What is diffraction-induced propagation?When the hole is illuminated by a parallel ray of light of wavelength lambda, it is believed that the dispersal of the spot (gotten on the left wall of the video) equals the sum of its geometrical dispersal and the spread induced by diffraction.
Diffraction is the term used to describe the spreading out of waves when they pass through an apertures or around objects. It occurs when the aperture's or obstruction's size and the incident wave's wavelength are of same magnitude. At very small aperture diameters, the most of the wave is blocked.
Briefing : Minimum angular spread due to diffraction (θ) = λ/b
Given.
Wavelength = 633nm = 633×10⁻⁹m
Beam diameter is 1mm.
Minimum angular spread due to diffraction (θ) = 633×10⁻⁹m/1
Minimum angular spread due to diffraction (θ) = 633×10⁻⁹m.
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g an apple pie in a 9.00 in diameter plate is placed upon a rotating tray. then, the tray is rotated such that the rim of the pie plate moves through a distance of 158 in. express the angular distance that the pie plate has moved through in revolutions, radians, and degrees.
The angular distance should be the angular distance that the pie plate has moved through in revolutions, radians, and degrees are 5.59 revolution and 2012.4° respectively.
In revolution, θ = 8.24 revolution.
In radian = θ = 57.78 rad.
In degree θ = 2966.4°.
Calculation of the angular distance:
Since
Pie diameter = 9 in
So, the circumference of the pie should be
P = πd = 9π in
And, rim of the pie rotates 158 in,
So,
1 Revolution of the pie is 9π in,
So, for 158 it should be
= 158 in / 9π in revolution
= 5.59 revolution
Now in the case when
1 revolution is 2πrad
So,
5.59 revolution = 5.59 × 2π = 87.79 rad.
And also, 1 revolution is 360°
5.59 revolution = 5.59 × 360 = 2012.4°
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let's say you use a heat pump to pump heat from room a to room b. the temperature in room a is 18.6 oc and in room b is 27.3 oc. if your goal is to cool space a, what is the theoretical cop limit?
The theoretical Coefficient of Performance (COP) to cool the room A is 33.52.
Temperature in room A = T₁ = 18.6 oc
Temperature in room B = T₂ = 27.3 oc
To convert temperatures in Kelvin,
= T₁ = 18.6 + 273 =
= T₁ = 291.6 K
and,
= T₂ = 27.3 + 273
= T₂ = 300.3 K
The COP value to cool room A =
= COP = T₁ / (T₂ - T₁)
= COP = 291.6 / (300.3 - 291.6 )
= COP = 291.6 / 8.7
= COP = 33.52
The theoretical coefficient of performance to cool room A is 33.52 when the temperature of room A is 18.6 oc and that of room B is 27.3 oc.
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the ring and the disk shown above have identical masses, radii, and velocities, and are not attached to each other. if the ring and the disk each roll without slipping up an inclined plane, how will the distances that they move up the plane before coming to rest compare?
The ring will move farther than will the disk.
The torque required to achieve a desired angular acceleration about a rotational axis depends on the moment of inertia of a rigid body.
The moment of inertia of a ring is given by the following equation [tex]I=mr^{2}[/tex]
similarly, the moment of inertia of a disk is [tex]I=m\frac{r^{2} }{2}[/tex]
Where, m and r is the mass and the radii of the ring and the disc.
The body's mass distribution and the axis selected to affect the moment of inertia, with larger moments requiring more torque to change the rotation rate. The object with the lowest moment of inertia will descend to the bottom first because it is resistance to rotational motion.
Therefore the disc will reach the bottom first, but due to the higher moment of inertia than the disc the ring will move farther than the disc.
The question is incomplete. The correct question is
A ring and a disk have identical masses, radii and velocities and are not attached to each other. If they each roll without slipping up an inclined plane, how will the distances that they move up the plane before coming to rest compare?
a. The ring will move farther than the disk.
b. The disk will move farther than the ring.
c. The ring and the disk will move equal distances.
d. The relative distances depend on the angle of elevation of the plane.
e. The relative distances depend on the length of the plane.
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suppose that a disk of indefinite radius is rotated at an angular velocity w in a large volume of liquid
The central angle relating to an object's position on a circle changes as it moves along a circular path.The rate at which this angle changes with respect to time is known as the angular velocity, denoted by the symbol w.
A Ferris wheel, for instance, might rotate pi / 6 radians every minute.
If a disk of indefinite radius is rotated at an angular velocity $w$ in a large volume of liquid, the liquid will experience a force known as the centrifugal force.
This force is directed radially outward from the axis of rotation and is given by the equation $F = mrw^2$, where $m$ is the mass of the liquid, $r$ is the distance from the axis of rotation, and $w$ is the angular velocity.
The magnitude of the force increases with the mass of the liquid, the distance from the axis of rotation, and the angular velocity of the disk.
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the technology that allows engineers to penetrate rock at multiple angles instead of simply a straight line is called(1 point)
The method used by engineers to pierce rock at angles other than just a straight line is known as directional drilling.
What is method?
A procedure connected to a message and an object is referred to as a method throughout object-oriented programming (OOP). An object is made up of state information and behaviour, which together make up the interface that outlines how any of the object's various consumers may use it. A method is indeed a consumer-parametrized behaviour of an object. Behaviors have been represented as methods, while data is represented as an object's properties. For instance, a Window object may have properties like open and close as well as methods like open and close, and its state (whether it is opened or closed at any given time) would be a method.
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Figure 1-1 shows how a steel ball moved during an experiment. Average speed is calculated by dividing total distance by time. Did the steel ball speed up, slow down, or remain at the same speed throughout the experiment?
The ball is seen to be speeding up as the distance increases with time.
What is speed?We know that speed is the ratio of the distance to the time that is taken by the object. We know that when an object is speeding up, the distance of the object is going to increase linearly with the time taken.
If we look at the graph that has been shown in the image that is attached to this answer, we would notice that the distance that is covered is increasing with time.
The speed can then we obtained from;
Speed = [tex]y_{2} - y_{1}/x_{2} - x_{1}[/tex]
= 80 - 0/6.5 - 0
= 12.3 m/s
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consider a wave passing through a single slit. what happens to the width of the central maximum of its diffraction pattern as the slit is made half as wide? it becomes one-fourth as wide. it becomes one-half as wide. its width does not change. it becomes twice as wide. it becomes four times as wide.
Wave passing through a single slit it becomes twice as width of the central maximum of its diffraction pattern as the slit is made half as wide.
The central maximum lies between the first-order minima defined by the relation sinθ dark =mλ/a=λ/a. Because the angle is small, sinθ dark ≈tanθ dark =y dark/L, so the width of the central maximum is proportional to Lλ/a. Thus, the central maximum becomes twice as wide if the slit width a becomes half as wide.
In order to enter the region of geometric shadow cast by the obstruction or aperture, waves must interact with one another or bend around its edges, which is referred to as diffraction. A secondary source of the wave that is propagating is in fact created by the diffracting item or aperture. The term "diffraction" was originally used in 1660 by the Italian scientist Francesco Maria Grimaldi, who was also the first to make precise observations of the phenomena.
On the registration plate, an infinite number of spots (three are illustrated) along length d project phase contributions from the wave front, resulting in a constantly changing intensity.
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a long straight wire carries current to the right. above the wire is a square wire loop. if the loop moves away from the long ,straight wire what is the direction of the induced current in the loop?
The loop's induced current flows counterclockwise because a long, straight wire carries current in that direction (to the right). There is a square wire loop above the wire. if the loop departs from the lengthy.
The loop's magnetic flux will decrease as the current in wire AB in the wire drops. Therefore, to counteract the drop in magnetic flux, the current introduced into the loop must be counterclockwise. Induced current definition The current that results from electromagnetic induction is known as the induced current. The production of electric power relies heavily on electromagnetic induction. Typically, metal is drawn through a hole in a die or draw plate to create wire. There are numerous standard sizes for wire gauges.
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what would be the effect on the motion of the cross if the center of mass of the body were to one side of the axis of rotation
Never does a free body revolve around its center of mass ( the instantaneous axis of rotation never passes through the center of mass).
Explain about the axis of rotation?Being a hypothetical object, the axis of rotation might be a challenging notion to understand. An imaginary line that extends through the joint's pivot or rotation point is referred to as the axis of rotation in terms of human anatomy (for example, the axis of rotation for flexing and extending the arm projects through the elbow joint).
The intersection of these three axes, which are the longitudinal, lateral, and vertical ones, each of which is perpendicular to the others, occurs at the center of gravity of the aero plane.
Position, momentum, and angular momentum make up an object's motion when it is rigid. Therefore, the "axis of rotation" is the unit vector, which is the object's angular momentum vector divided by the angular momentum magnitude (and therefore undefinable in the absence of angular momentum).
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In a canoe race, team a is traveling 6 miles per hour and is 2 miles ahead of team b. Team b is also traveling 6 miles per hour. The teams continue traveling at their current rates for the remainder of the race. Using d for distance (in miles) and t for time (in hours), write a system of linear equations that represents this situation.
Linear equation for team a; d = 6t + 2 and Linear equation for team b;
d = 6t.
What is the relationship between speed, distance and time?To find speed, divide the distance of the journey by the time it took to travel. To calculate the time, divide distance by speed and to get the distance, multiply speed by time.
Given that in a canoe race, team a is traveling 6 miles per hour and it is 2 miles ahead of team b.
Team b is traveling 6 miles per hour. The teams continue the traveling at their current rates for the remaining race.
We know that speed= distance/time
Linear equation for team a;
d = 6t + 2
Linear equation for team b;
d = 6t
d is distance and t is time.
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Scientists at a metallurgic factory are testing different metals to study the strength of the electrical forces between their atoms. They determined the force needed to bend a sheet of each metal and found that metal a requires 50 n of force, metal b requires 30 n, metal c requires 70 n, and metal d requires 100 n. Which metal will have the lowest melting point?.
The metal that has the lowest melting point must be the metal that has the lowest density and therefore is easiest to bend. That is metal B.
The melting point of the metal depends upon the types of bonds between the metal atoms. The relationship between the melting point of a substance and the strength of the intermolecular force of that substance is directly proportional. That means that the stronger the intermolecular forces of the substance, the higher the melting point of the substance.
Tungsten has the highest melting point of any metal in the periodic table is 3422 °C.
As the strength of the intermolecular forces increases, more energy is needed to disrupt the attraction between these molecules. As a result, increasing intermolecular forces results in a concomitant increase in melting point.
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a laser emits photons continuously at a rate of 6.8*1016/s. if the wavelength of the photons is 641 nm, what is the laser power in mw?
The laser power is 27,69 mW.
Power= energy/sec = J/s
Photon energy= hf= hc /wavelength
# of photons/sec = power/ photon energy= rate of emission
Photon Energy= ( 6.63 × [tex]10^{-34}[/tex]) × 3×[tex]10^{8}[/tex] / 6.8×[tex]10^{16}[/tex] ≈ 3.147 ×[tex]10^{-42}[/tex] J
This should be ignored. It is part of the units and not the equation.
Power/3.147 × [tex]10^{-42}[/tex] = 8.8 × [tex]10^{26}[/tex] [tex]s^{-1}[/tex]
Power= 8.8 × [tex]10^{-26}[/tex]- 3.147 × [tex]10^{-42}[/tex] J= 0 .02769 W = 27.69 mW
How is laser power determined?
The energy levels of the electrons in the atoms of the material used to create the laser beam—often referred to as the "lasing" material—determine the intensity of the laser beam. The wavelength of the light generated by the lasing material has an inverse relationship with the energy level of the photons that are created by it.
Can a laser's power be increased?
The intensity of the light increases with the amount of energy used to excite those atoms in the laser. It almost resembles dialing up the sound system's volume control. However, if you turn that level up too loud, you run the danger of harming your hearing or the sound system itself.
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Can someone please help meeeeeeee! I’m so bad at these stuff. Ill give brainliest too
46. what minimum friction force must exist between the tires and the road to prevent the car from skidding as it rounds the curve?
Daniel G. A=v2r calculates centripetal acceleration. The recommended minimum friction coefficient is 0.4.
How much friction must there be at a minimum for the car to stay on the road?Of course, the car won't slide if the coefficient of friction is higher than 0.141; this is the minimum value. The frictional force is parallel to the velocity, as you can see.
What level of frictional force is needed to prevent the car from swerving?A car needs a centripetal force of mV2/R, where m is the mass of the vehicle, V is the speed, and R is the radius of the circular portion of road, in order to maintain its position on the road without skidding. Fs/Fl = 4mV2/R / 2mV2/R is obtained by dividing Fs by Fl.
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explain the relationship between diffraction angle and wavelength using the two dimensional diffraction relationship n
Diffraction is defined as the bending of waves through an aperture or around the edges of an obstruction into the vicinity of the barrier and The wavelength's length directly affects the angle of diffraction.
Why is it called wavelength?When electromagnetic radiation such as radio waves, light waves, or infrared (heat) waves travel through space, they leave behind distinctive patterns. The wave has a distinct size and shape. Wavelength is the separation between peaks (high points).
What occurs if the wavelength is boosted?A wavelength's frequency plus energy (E) drop as it gets longer. You may conclude from these formulas that the length gets shorter as the frequency rises. The wavelength lengthens as the frequency drops.
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calculate the work w done by the gas during process 1→3→6 . express your answer in terms of p0 and v0 .
6P₀V₀ is the work done by the gas during process 1→3→6.
What is work done by gas?The work performed by a gas expanding against an external pressure is negative, analogous to the work performed by a system on its surroundings. In contrast, when a gas is compressed externally, V₀ and the work is positive because the environment exerts force on the system.
The gas must release some energy into the environment when it expands in response to an external pressure. The overall energy of the gas is thus reduced as a result of the negative work. When a gas is compressed, energy is transferred to it, increasing its energy as a result of positive work.
Let's consider,
Work done = -W (As the energy is released)
External pressure = P₀
Volume of gas = V₀
So, the work done can be calculated as follows:
W = P x (dV)
-W = P₀ × V₀
Now according to the process given:
1→3→6
Energy flow increases up to 6.
Hence, the energy of the system (work done) is:
-W = 6 × P₀ × V₀
-W = 6P₀V₀
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A diver in the pike position (leg? straight _ hands on ankles) usually makes only one or onc-and-a-half rotations. To make tWO Or three rotations_ thie cliver goes into tuck position (knees bent , body curled up tight) . Why? 12.62 A 120-Cm-wide sign hangs from 5.0 kg; 200-cm-long pole cable of negligible maSS supports the end of the rod as shown in the figure_ What is the HaXimu maSS of the sign if the maxinm tension in the cable without breaking is 300 N? Note: You will be graded On your use of all elements from Dynamics Worksheet Problem 2. Cable 250 cm 200 cm PATSIES SHIPPE 80 cm
It's crucial to understand that when a diver leaps off a springboard, their angular momentum stays constant until they touch the water's surface.
Despite acting on the diver, gravity does not exert a net positive or negative torque on the diver since it passes through the diver's center of mass. The diver can make two to three rotations when in the tuck position, but only one or two rotations when in the pike position. The moment of inertia of the two places is the cause. The moment of inertia of the diver in the tuck position can be lower. Given that the diver's angular speed is inversely proportional to the moment of inertia, she will make more rotations for the constant angular momentum.
I1w1 =I2w2
w1/w2 = I1/I2
I1 = mr1^2
I2 = mr2^2
r2<r1
then I2<I1
w1/w2<1
w1<w2
From the above analysis we can say that the angular velocity is less in the first case than in the later case which means the number of rotations made in the tuck position is more than number of rotations made than that in pike position.
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what is the debroglie wavelength in picometers (10-12m) of an electron that is traveling at 79.1% of the speed of light?
The debroglie wavelength in picometers (10-12m) of an electron that is traveling at 79.1% of the speed of light is 2.8 × [tex]10^{-12}[/tex]
Mass of electron m = 9.1 × [tex]10^{-31}[/tex]kg
speed of electron v = 3 ×[tex]10^{8}[/tex] m/s * (79.1/100) = 2.37 × [tex]10^{8}[/tex] m/s
debroglie wavelength λ = h/mv
λ = 6.626 [tex]10^{-34}[/tex]/9.1 × [tex]10^{-31}[/tex] × 2.37 × [tex]10^{8}[/tex]
λ = 2.8 × [tex]10^{-12}[/tex]
In many branches of physics, the speed of light in a vacuum, commonly abbreviated as c, plays a crucial role. Exactly 299,792,458 meters per second is the speed of light, or c. [Note 3] The speed at which common matter or energy can travel through space (and, consequently, any signal carrying information) is limited to c, according to the special theory of relativity.
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when a rigid object rotates about a fixed axis, what is true about all the points in the object? (there could be more than one correct choice.)
When a rigid item rotates along a fixed axis, the following occurs:
They are all moving at the same angular speed.
They are all moving at the same angular velocity.
When a rigid item rotates along a fixed axis, the following occurs:
They are all moving at the same angular speed.
They are all moving at the same angular velocity.
When a rigid item rotates along a fixed axis, all of its angular speeds are the same.
All of the particles in the rotating object have the same angular speed.
They are all moving at the same angular velocity.
All of the particles in the rotating object have the same angular acceleration.
All of this stems from the following relationships:
v=wR
a = alpha*R
where w is the angular velocity and alpha is the angular acceleration.
tangential velocity and acceleration depend on the distance from the axis, whereas angular velocity and acceleration are the same for all the points on the rotating body.
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an infinite moderator contains unifonnly distributed isotropic sources emitting s neutrons/cm3 -sec. detennine the steady-state flux and current at any point in the medium.
The steady-state flux and current at every location in the medium are given by Ф ≅( S(2^1/2)/π*d)* e^-a/(2)^1/2*L. Since there are isotropic sources that are equally distributed and emit s neutrons per cm3/s
According to Fick's first law, which stipulates that diffusion flow is proportional to concentration gradient, steady-state flux diffusion processes are identified by this property. Diffusion coefficient or diffusivity are other names for the proportionality constant, D. It is expressed in m2/sec. J x can be used to represent the one-dimensional case for steady-state flux. The movement of electrical charge carriers like electrons is known as current. Positive and negative locations both experience current flow. The ampere is the SI unit for calculating electrical current (A). The movement of electrical charge carriers like electrons is known as current. Positive and negative locations both experience current flow.
Ф ≅( S/4*π*d)* e^(r/l)/r
Ф ≅( S/4*π*d)* e^-a/(2)^1/2*L
Ф ≅( S(2^1/2)/π*d)* e^-a/(2)^1/2*L
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would the balloon hit the ground before or after 1.0 s of falling? which equation did you use to decide, and what comparison did you make to determine that it would or would not hit the ground by then?
The first equation will be used to determine that it would hit the ground after 1.0s of falling (in 1.56 s).
Equation of motion are a mathematical formula that describes the position, velocity or acceleration of a body relative to a given frame of reference
The first equation to be used will be second equation of motion
x = v₀t + 1/2at²
where, x = distance
a = uniform acceleration
t = time
12 = 1/2*9.8 *t²
24 = 9.8 * t²
t = 1.56 s.
The balloon will hit the ground after 1.0s of falling.
The 1st equation was used because of the values provided which included the distance and the acceleration due to gravity. The 2nd equation has final velocity and initial velocity which couldn't be compared from the data given.
The given question is incomplete complete question is:
A student holds a water balloon outside of an open window and lets go. The window is 10 meters above the ground, and the balloon is falling under the acceleration of gravity, which is 9.8 m/s2. There are two equations that can be used to describe its motion over time:
x=x0+v0t+12at2
v=v0+at
Would the balloon hit the ground before or after 1.0 s of falling? Which equation did you use to decide, and what comparison did you make to determine that it would or would not hit the ground by then?
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A helium-neon laser emits light with a wavelength of 633 nm. What is the frequency of this light.
Answer:
The frequency of light beam is 4.74 x 10^(14) s^(-1)
Explanation:
In this problem we use the formula C=F x ( lamda )
here c= the speed of light
f =the frequency of light beam
lamda = wavelength
c=3 x 10^8 m/s ( universally same)
lamda = 633nm = 633 * 10^(-9) m
Therefore f = c/ ( lamda )
or; f = 3 x 10^8 / 633 * 10^(-9)
f= 4.74 x 10^(14) s^(-1) .
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An engineer is investigating potential energy with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move. To test her ideas, the engineer will move one car one space. Which movement will result in the largest increase in potential energy?.
Movement that will result in the largest increase in potential energy : All the movements will result in the same change in potential energy because they each move a roller coaster car for the same distance.
Which movement will result give largest increase in potential energy?Since they move in the same direction, therefore share the same magnetic qualities and move one unit identically.
The potential energy increases because train moves against the magnetic force and potential energy does not change because the magnets in the system do not change. Engineer is experimenting with two identical magnetic roller coaster cars on the different sides of a center magnet that cannot move.
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The physician who was inspired by traveling mesmerists and who coined the term hypnosis was ____________. A. Franz mesmer b. James braid c. Jean martin charcot d. Sigmund freud please select the best answer from the choices provided a b c d.
James braid, a physician, is credited with coining the term hypnosis after becoming mesmerized while traveling. Hence, the relevant option is option (b).
Who was James braid?James Braid was born on June 19, 1795, and passed away on March 25, 1860. He was a well-known Scottish surgeon who was also a gentleman scientist and natural philosopher. According to Braid, hypnotic suggestion can be an effective treatment for nervous system functioning problems. Comparative anatomy has been defined as the study of similar body features in various animal species in order to suggest or comprehend modifications that have to occur underground during the course of evolution from very similar predecessors.
The research that compares the structural differences between various animal species in order to comprehend the changes that each species went through during the stage of evolution from their common ancestors. James braid, a physician, is credited with coining the term hypnosis after being mesmerized while traveling.
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an object moves halfway around a circle of radius r. an inward radial force of magnitude f is exerted on it. the work done on the object by the radial force being exerted on it is
The item moves halfway around a circle of radius r. an inward radial pressure of magnitude f is exerted on it. the paintings done on the item through the radial force being exerted on it is zero.
In physics, paintings is the power transferred to or from an object via the software of pressure along a displacement. In its most effective form, for a consistent strain aligned with the direction of motion, it equals the fabricated from the force strength and the gap traveled.
The work modifications the quantity of mechanical and internal electricity possessed with the aid of devices. whole paintings is carried out on a gadget or object, power is added to it.
The individual of labor accomplished can be categorised in three instructions. they're +ve paintings, -ve paintings and 0 work. The character of work is based upon at the attitude amongst stress and displacement..
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Nuclear decay occurs according to first-order kinetics. How long will it take for a sample of titanium-45 to decay from 65. 0 grams to 25. 0 grams? the half-life of titanium-45 is 3. 08 hours.
It will take 4.24 hours for a sample of titanium-45 to decay from 65. 0 grams to 25. 0 grams.
Half life of first order reaction is given by: [tex]t_{1/2}[/tex] = 0.693/k
Given half life is 3.08 hours.
So k = 0.225
Rate of first order reaction is given by: [tex]kt = 2.303 * log(R'/R)[/tex]
Where k = rate of reaction = 0.225
t= time taken
R' = final amount = 25g
R = initial amount =65g
Putting these values we get t=4.24 hours.
So it will take 4.24 hours for a sample of titanium-45 to decay from 65. 0 grams to 25. 0 grams.
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• (n) if we take the potential energy of a i oo-kg object and earth are zero when the two are separated by an infinite distance, what is the potential energy when the object is at the surface of earth? (b) find the potential energy of the same object at a height above earth's surface equal to earth's radius. (c) find the escape speed for a body projected from this height.
The potential energy of the object when it is at the surface of the Earth is -3.53 x 10^14 J
What is potential energy?
Potential energy in physics is the energy that an object retains as a result of its position in relation to other objects, internal stresses, electric charge, or even other elements. The gravitational potential of an object, this same elastic potential energy of a stretched spring, as well as the electric potential power of the an electric charge inside an electric field are examples of common types of potential energy. The joule, denoted by the letter J, is the energy unit inside the International System of Units (SI). Although it has connections to the Greek philosopher Aristotle's idea of potentiality, the term "potential energy" was coined by the Scottish engineer as well as physicist William Rankine in the 19th century.
(a) The potential energy of the object when it is at the surface of the Earth is equal to the gravitational potential energy, which is calculated by the equation:
PE = -GmM/r
Where G is the gravitational constant (6.67 x 10^-11 m^3 kg^-1 s^-2), m is the mass of the object (100 kg), M is the mass of the Earth (5.98 x 10^24 kg) and r is the distance between the object and the center of the Earth (6.37 x 10^6 m).
Therefore, the potential energy of the object when it is at the surface of the Earth is:
PE = -GmM/r = -6.67 x 10^-11 x 100 x 5.98 x 10^24 / 6.37 x 10^6 = -3.53 x 10^14 J
(b) The potential energy of the object when it is at a height above the Earth's surface equal to the Earth's radius is calculated by the same equation as above, but with a different value for r. Since the height is equal to the Earth's radius, the distance between the object and the Earth's center is doubled and the potential energy is equal to:
PE = -GmM/r = -6.67 x 10^-11 x 100 x 5.98 x 10^24 / (2 x 6.37 x 10^6) = -1.76 x 10^14 J
(c) The escape speed for a body projected from this height is calculated by the equation:
v_esc = sqrt(2GM/r)
Where G is the gravitational constant (6.67 x 10^-11 m^3 kg^-1 s^-2), M is the mass of the Earth (5.98 x 10^24 kg) and r is the distance between the object and the Earth's center (2 x 6.37 x 10^6 m).
Therefore, the escape speed for a body projected from this height is:
v_esc = sqrt(2GM/r) = sqrt(2 x 6.67 x 10^-11 x 5.98 x 10^24 / (2 x 6.37 x 10^6)) = 11.2 km/s
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in blind cave fish, eyes do not form. however, transplantation of the lens from a closely-related aboveground fish into the optic cup of the cave fish induces eye development. what does this suggest about the loss of vision in the cave fish?
According to Moran, the evidence points to pleiotrophy and energy savings as two key factors in the cavefish eye loss.
How does evolution explain why cavefish are blind?Mexicanus was created through natural selection, pleiotropy, and genetic drift, not through human initiative. Organisms get what they need via natural selection. The fish must conserve energy to avoid going blind. Fish lose their eyes because they are unnecessary.
Why is cavefish's vision not more crucial?The Mexican tetra (Astyanax mexicanus) has been evolving in caves for the last few million years in forms that are blind. The loss of eyes is a major benefit for creatures living in the dark since maintaining eyes and the visual regions of the brain requires a lot of energy. The cavefish instead "sees" by sucking.
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