The kinetic energy of the baseball be 63 joule.
The player had to work of 63 joule on the ball to give it this energy.
What is kinetic energy?According to the definition of kinetic energy in physics, it is the amount of work that an item may accomplish while in motion.
As a scalar quantity, kinetic energy can only be fully defined by its magnitude.
Given that:
Mass of the baseball: m = 0.14 kg.
Speed of the baseball: v = 30 m/s.
So, kinetic energy of the baseball= 1/2×0.14×30² joule = 63 joule.
Hence, the player had to work of 63 joule on the ball to give it this energy.
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Shown below are the four terrestrial planets of our solar system. Assume that all the planets started out equally hot inside. Rank the planets based on their expected cooling rates, from fastest cooling to slowest cooling.MercuryMarsVenusEarth
The rank of the terrestrial planets based on their expected cooling rates, from fastest cooling to slowest cooling is as follows -
mercury , Mars, Venus, Earth
Mercury - It is the smallest terrestrial planet in the solar system. It has a thin atmosphere, which causes it to swing between burning and freezing temperatures.
Mars - It is less dense than Earth and has a smaller magnetic field, which is a indication of a solid core rather than a liquid one. Mars is known to have water ice and organics- some of the ingredients for living things.
Venus - It is about the same size as Earth and has a thick, toxic carbon-monoxide (CO) dominated atmosphere that traps heat, making it the hottest planet in the solar system.
Earth - Out of the four terrestrial planets, Earth is the largest and has regular seasons for much of it surface; regions closer to the equator tend to stay warm, while spots closer to the poles are cooler and in the winter, icy.
Therefore, the cooling rate of terrestrial planets is Mars, Earth, Venus, Mercury
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an uncharged capacitor and a resistor are connected in series to a source of emf. if e 5 9.00 v, c 5 20.0 mf, and r 5 100 v, find (a) the time constant of the circuit, (b) the maximum charge on the capacitor, and (c) the charge on the capacitor at a time equal to one time constant after the battery is connected.
a)The time constant of the circuit is 2sec.
b)The maximum charge on the capacitor is 0.18C
c)The charge on the capacitor at one time constant is 0.18×(1-(1/[tex]e^\frac{t}{500}[/tex]).
a)We have resistor resistance 100ohm,capacitor capacitance as 20mf and EMF value as 9V.
We know very well that the time constant of the circuit is defined as the product of Resistance and Capacitance, or in other words
τ=R×C
Therefore,τ=100ohm×20×10⁻³F
=>τ=2sec.
b)The maximum charge on the capacitor is defined as the product of capacitance and voltage applied by the battery.
In other words, Q=C×E
=>Q=20×10⁻³F×9V
=>Q= 180×10⁻³C
=>Q=0.18C
c)Now,we need to find the charge on the capacitor at one constant time.We know very well that charge on the capacitor at any given time is represented by
q(t)=q₀(1−1 /[tex]e\frac{t}{RC}[/tex])
where q₀ is the maximum charge induced on the capacitor
Therefore, q(t)=0.18×(1-(1/[tex]e^\frac{t}{100.5}[/tex])
=>q(t)=0.18×(1-(1/[tex]e^\frac{t}{500}[/tex])
Hence, a)time constant is 2sec,b)maximum charge is 0.18C and c)charge at one time constant on capacitor is q(t)=0.18×(1-(1/[tex]e^\frac{t}{500}[/tex]).
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a solid cylinder with a mass of 5 kg and a radius of 30 cm is rolling on a flat surface. the cylinder rolls with a speed of 2 m/s. what its kinetic energy?
The total kinetic energy of a cylinder is 15 J.
Given that, mass = 5 kg
Radius of the cylinder= 30 cm = 30/100 m = 0.3 m
Speed = 2 m/s
Ut = Uk + Ur
where, Uk - translation kinetic energy
Ur - rotational kinetic energy
I is the moment of inertia of the solid cylinder
⇒ 1/2 mv² + 1/2 Iω²
⇒ 1/2 mv² + 1/2 [1/2 m r² * (v/r)²]
⇒ 1/2* 5 * (2)² + 1/2 [1/2* 5 *(0.3)² * (2/0.3)²]
⇒ 10 + 1/2*1/2*5* (0.3)²* 4 / (0.3)²
⇒ 10 + 5 = 15 J
Thus, the total kinetic energy is 15 J.
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a grating with 532 lines/mm is illuminated with light of wavelength 565 nm. what is the angular separation between the two lines formed in order m
The angular separation is 77.8°.
What is angular separation?
It is the angle between two point objects or sightlines, as seen from an observer. It is denoted by θ.
What is bragg's law?
Bragg's law states that "The reflected x-ray beam has the same angle of scattering as the incident beam when an x-ray beam strikes a crystal at an angle. When the path difference (d) is equal to the wavelength's whole number (n), constructive interference will result."
nλ = 2d sin θ
Separation of 532 lines = 1 mm, so the slit separation is,
d= 1 / 532 mm
=[tex](1.8 * 10^-^3mm) (\frac{10^-^3m}{1 mm)}[/tex] = [tex]1.8 * 10^-^6[/tex] m
The Bragg's equation is,
d sinθ = nλ
Rewrite the Bragg's equation for θ
θ = [tex]sin^-^1[/tex] [mλ / d ]
Thus, the angle of diffraction is,
θ = [tex]sin^-^1 [\frac{2(565 * 10^-^9) }{1.8 * 10^-^6}][/tex]
= 38.89°
Angular separation = 2θ
=2(38.89)°
= 77.78°
≅ 77.8°
The angular separation is 77.8°.
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a piece of cork has a mass of 15 g in air and a specific gravity of 0.25. the cork is attached to a lead sinker whose mass is 230 g in air. what will be the apparent mass of the pair when they are both submerged in water?
With a piece of cork connected, which has a mass of 15 g in air and a specific gravity of 0.25, the pair weighs 164.736 grammes when they are both submerged in water.
A physical body's mass is its total amount of matter. Inertia, or the body's resistance to acceleration (change of velocity) when a net force is applied, is also measured by this property. The gravitational pull an object has on other bodies is also influenced by its mass. A substance will float on water if its specific gravity is less than 1. sp gr, or specific gravity, is a common abbreviation. The following formula represents specific gravity, which is also known as relative density: Substance formula: substance / reference The purpose of comparing densities
60 grammes of water are equal to 15 grammes of cork when divided by 15.25. Lead's specific gravity is 11.35; its mass is (230+15)-(60+20.264); and its mass is 245 - (80.264) grammes.
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speedboat a negotiates a curve whose radius is 120 m. speedboat b negotiates a curve whose radius is 240 m. each boat experiences the same centripetal acceleration. what is the ratio of the speeds of the boats
Ratio of the speeds of the boats with equal centripetal acceleration is 0.7.
Centripetal acceleration is defined as the change in tangential velocity and is experienced during uniform circular motion. It has a magnitude equal to the square of the body's speed v along the curve divided by the radius r (or distance) from the centre of the circle to the moving body. The centripetal acceleration ac is given by:
ac = v^2/ r
For the boat A:
ac = va^2/ 120
For the boat B:
ac = vb^2/ 240
As provided, the centripetal acceleration is equal for both boats, hence
va^2/ 120 = vb^2/ 240
va^2/vb^2 = 120/240
va^2/vb^2 = 0.5
va/vb = √0.5 = 0.7
Hence, the ratio of the speeds of the boats is 0.7
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a 1.5 kg 1.5 kg ball rotates on the end of a 3 m 3 m string in a vertical circle with a speed of 7 m/s 7 m/s. what force does the ball exert on the rope at the top of the vertical circle?
Force exerted by the ball on the rope is 24.5 N.
Force is an external influence that can change the velocity or motion of an object.
It can also be defined as the product of mass and acceleration.Mathematically, force F = m*amass of the ball = 1.5 kg
Radius of the circle = 3 m
Speed at which the ball is rotating = 7 m/s
Since the ball is rotating in a vertical circle, centripetal force acts on it.
Centripetal force is the force exerted on a rotating object and the gravitational force in a vertical circle is zero.
Mathematically centripetal force is Fc = mv²/r
Fc = 1.5 * (7)²/ (3)
Fc = 24.5 N
Force exerted by the ball on the rope at the top of the vertical circle is 24.5 N.
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A block of iron has the dimensions of 3. 00 cm x 3. 00 cm x 3. 00 cm. It has a mass of 213 g. When placed in water, the block sinks. What volume of water did it displace? 213 cm 3 0. 127 cm 3 7. 89 cm 3 27. 0 cm 3.
When the block of iron is placed in water the volume of water that is displaced is 27.0 cm³
Hence, Option D is correct.
Explain in detail.
The volume water that is displaced is equal to volume of block of the ironvolume of block of iron = length x width x height length= 3 cm width = 3 cm height = 3 cmtherefore the volume displaced = 27 cm³ since the volume of water displaced is equal to volume of block.
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a beam positioned on a fulcrum is 6 m long. it has a weight of 300 n attached to one end and a weight of 250 n attached to the other end. to establish mechanical equilibrium, the fulcrum must be placed how far away from the 250 n weight? (answer in m)
To establish mechanical equilibrium, the fulcrum must be placed 3.27 m away from the 250 N weight.
What is the position of the fulcrum?
The position of the fulcrum from the 250 N weight is determined by applying the principle of moment as shown below.
let the position of the fulcrum = d
The position of the 250 N from the fulcrum must be greater than the center of the beam since 300 N is heavier than 250 N.
----------------------------------Δ--------------------------------
↓ d ↓
250 N 300 N
the position of the 250 N weight from the fulcrum = d
the position of the 300 N weight from the fulcrum = 6 m - d
take moment about the pivot;
sum of the antic lock wise moment = sum of the clockwise moment
250 ( d ) = 300 ( 6 - d )
250d = 1,800 - 300d
550d = 1,800
d = 1,800 / 550
d = 3.27 m
Thus, the position of the fulcrum from 250 N depends on the length of the beam and the weight hanging at the other end.
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A glider on an air track is connected by springs to either end of the track. Both springs have the same spring constant, k, and the glider has mass Ma) Determine the frequency of the oscillation, assuming no damping, if k = 125 N/m and M = 210 g .b) It is observed that after 55 oscillations, the amplitude of the oscillation has dropped to one-half of its initial value. Estimate the value of γγ, using x(t)=A* e^γt * cosω′tc) How long does it take the amplitude to decrease to one-quarter of its initial value?
The amplitude drops to one-quarter of the initial value after 102.7 oscillations.
λ=1/51⋅0.20slog(1/2)=−0.68s^-1
Using the previous result we can evaluate the amplitude as a function of time to obtain the elapsed time until the amplitude drops to one-quarter of its initial value,
1/4=Aeλt.
Solving for the time,
t=1/λlog(1/4)=20.4s
Comparing this result with the period,
t=102.7T.
The maximum displacement or distance made by a point on a vibrating body or wave relative to its equilibrium location is known as the amplitude in physics. It is equivalent to the length of the vibration path divided in half. Amplitude is the separation between the wave's resting position and its highest displacement. Frequency is the number of waves that cross a particular place in a second. Period—the length of time needed for a wave cycle to complete
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1. (10 points) when ashley sat on a rotating stool holding a set of weights close to her body, her rate of rotation changed when she moved the weights away from her body. did her rate or rotation slow down or speed up? why did this occur? did this violate the conservation of energy?
Moment of inertia decreases. due to friction effects associated with the tides driven by the Moon.
Conservation of energy Physics. a fundamental regulation of physics and chemistry stating that the whole power of an isolated system is steady despite inner modifications. it's far most normally expressed as electricity can neither be created nor destroyed and is the basis of the first law of thermodynamics.
According to the regulation of conservation of electricity, electricity can not be created or destroyed. it is able to, however, be converted from one shape to some other. whilst all kinds of strength are considered, the full strength of an isolated gadget stays consistent.
The longer we pass without making enormous adjustments, the greater the risk of world warming and climate exchange come to be in our everyday lives. whilst we burn fossil fuels, they devise an awesome amount of greenhouse gas emissions.
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As you watch the video, notice that the size of the tidal bulges varies with the Moon's phase, which depends on its orbital position relative to the Sun. Which of the following statements accurately describes this variation?
Low tides are lowest at both full moon and new moon.
Low tides are highest at both full moon and new moon.
High tides are highest at full moon and lowest at new moon.
Low tides are highest at full moon and lowest at new moon.
High tides are highest at both full moon and new moon.
High tides are highest at first- and third-quarter moon.
The two statements that accurately describes this variation are that low tides are lowest at both full moon and new moon, high tides are highest at both full moon and new moon.
What is the reason for this?
As the video shows, the tidal minima are smallest and the tidal bulges are largest at full moon and new moon, because those times when tidal forces due to the Sun and Moon get aligned (and therefore add to one another).
So, high tides are higher and low tides are lower at these times, and these are called spring tides. (In contrast, we have neap tides at first- and also third-quarter moons, when high tides are not as high and low tides are not as low as usual.)
Therefore, the two statements that accurately describes this variation are that low tides are lowest at both full moon and new moon, high tides are highest at both full moon and new moon are .
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A 90 g mass is attached to one end of a 10-cm-long spring. The other end of the spring is connected to a frictionless pivot on a frictionless, horizontal surface. Spinning the mass around in a circle at 90 rpm causes the spring to stretch to a length of 12 cm.
The spring constant of the spring is 6.66 N/m.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
The rotational speed of the 90 g = 0.09 kg mass is: ω = 90 rpm
= 90×2π/60 radian/second.
= 3π radian/second.
So centripetal force acting on the spring = mω²r
This causes the spring to stretch to a length of 12 cm = 0.12 m.
Hence, spring constant: k = mω²r/0.12 = 0.09×(3π)²×0.10/0.12 N/m = 6.66 N/m.
Hence, the spring constant of the spring is 6.66 N/m.
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what is the minimum coefficient of friction between the tires and the road that the car could have and still make the turn?
The minimum coefficient of friction between the tires and the road that the car could have and still make the turn is 0.7 for dry roads and 0.4 for wet roads.
The value of minimum coefficient of friction is usually between 0 and 1 but can be greater than one. A value of zero means there is no friction between the objects such is possible with a lubricant material . All objects, should have friction between them when they come in contact with each other.
The coefficient of friction is as low as 0.05 between dry sliding surfaces will be achieved when the mechanical interconnections are removed. This outcome has been attained based on a theoretical model of an ideal surface for low friction.
The coefficient of friction having value 1 is a perfect positive correlation. A coefficient of correlation zero means there is no linear relationship. Correlation coefficients are used in science to assess the degree of association between two variables, factors, or data sets.
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a total lunar eclipse is visible: group of answer choices only within a narrow path on earth only during new moon phase visible to observers on a whole hemisphere of earth an opportunity to observe the solar corona
The correct answer is only within a narrow path on earth. This is because the shadow of the earth during a total lunar eclipse is only large enough to cover a small area on the earth's surface.
Lunar eclipse:A total lunar eclipse is visible only within a narrow path on earth, where the moon passes directly through the center of the Earth's shadow. This path, which is typically around 160 to 270 kilometers (100 to 170 miles) wide, moves eastward as the Moon orbits Earth.
During a total lunar eclipse, the moon is fully engulfed in Earth's shadow, making it visible to observers on a whole hemisphere of earth. However, an opportunity to observe the solar corona is not visible during a total lunar eclipse. The solar corona can only be seen during a total solar eclipse.
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what do we mean by the halo of a galaxy? (a) it is the central region that is crowded with stars. (b) it is a large, roughly spherical region surrounding the disk. (c) it is the pancake-shaped region in which spiral arms are found.
A galaxy's halo is a large, generally spherical area that surrounds the disk.
Solution b is accurate.
What is Halo Galaxy?An extended, approximately spherical component of a galaxy that extends beyond the primary, visible component is called a galactic halo. The halo is made up of several distinctive galaxy parts, including: the halo of a star. a galaxy's corona (hot gas, i.e. a plasma)
The term "halo" refers to a ring of light that seems to surround the sun or moon and is caused by the refraction or reflection of light by atmospheric ice particles.
Globular clusters and other aging stars can be found in the galactic halo, a region of the galaxy that extends far above and below the galactic disk. - Roughly round; somewhat flattened. - Only includes old stars. - is free of gas and dust.
Thus halo galaxy is a large, roughly spherical region surrounding the disk (option B is correct)
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click to turn on the electric field. there is something interesting about the direction of electric field between the plates. why do you think that this situation appears in so many physics problems?
This situation appears in physics problems because of the negative charge, an inward-facing radial electric field is produced.
However, due to E=F/Q (here, Q is negative, so) there is another negative charge, which experiences a force in the direction radially opposite the first negative charge.As a result, force would be moving in the opposite direction from the field, which is directed towards the negative charge.However, in actuality, atoms would lose their electrons in order to generate a positive charge. The protons would be more numerous than the electrons, giving it a positive charge.Because a test particle would be subjected to two forces acting in opposite directions at the point of intersection, field lines produced by a single charge do not intersect.To know about protons -
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jupiter nudges the asteroids through the influence of (a) tidal forces. (b) orbital resonances. (c) magnetic fields.
The asteroids are moved by Jupiter under the influence of (b) orbital resonances.
What are asteroids ?
Small, stony objects called asteroids orbit the Sun. Asteroids, sometimes known as minor planets, are rocky, airless debris from the early stages of the solar system's creation, which occurred around 4.6 billion years ago.
When two satellites' orbital periods are related by integer relationships, they can exert gravitational pull on one another and change the eccentricity of their orbits, resulting in an orbital resonance. Io, Europa, and Ganymede are the three inner moons of planet Jupiter. They are locked in a 4:2:1 orbital resonance, which means they are playing the same note in different octaves. The tones that Callisto and Ganymede produce are almost an octave and a minor third apart because they are almost in a 12:5 resonance.
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Sam, whose mass is 75 kg, straps on his skis and starts down a 50-m-high, 20 ^\circ frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies.
a)Find Sam's speed at the bottom using work and energy.
b)Find Sam's speed at the bottom using Newton's laws.
At the base of the incline, Sam is moving at a speed of 15.73 m/s. who weighs 75 kg puts on his skis and begins to descend a 50 m-high, 20 frictionless slope.
Sam's bottom-of-the-screen speed is determined using the Work-Energy Theorem as follows: An object moves parallel to the plane on a slope with no friction. Both the normal force and the gravitational perpendicular component cancel each other out because they are acting in the same speed. Therefore, an object on a frictionless slope is solely accelerated by the gravitational parallel component. On a surface on an inclined plane with no friction, any item accelerates.
delta W is equal to the delta kinetic energy for frictionless slope
(36750 - 27472) = 1/2*75*(v2 -0).
9278=37.5(v^2)
v^2 = 9278/37.5(v2)
v^2 = 247.4v = 15.73 m/s
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a particle of mass 0.195 ???? carries a charge of −2.50×10ି଼ ????. the particle is given an initial horizontal velocity that is due north and has a magnitude of 4.00×10ସ ௦. what are the magnitude and direction of the minimum magnetic field that will keep the particle moving in the earth’s gravitational field in the same horizontal, northward direction?
The magnitude and direction of the minimum magnetic field that will keep the particle moving in the earth’s gravitational field in the same horizontal, northward direction is 1.911 Tesla.
Velocity v = 4×[tex]10^{4}[/tex]
Charge q = 2.5 × [tex]10^{-8}[/tex]
Mass of particle m= 0.195 g = 0.195 × [tex]10^{-3}[/tex] kg
Using the concept of Lorentz force
mg=Bvq
B = mg/vq
Substituting the values
B= 0.195 × [tex]10^{-3}[/tex] × 9.8/4×[tex]10^{4}[/tex]×2.5×[tex]10^{-8}[/tex]
B= 1.911 Tesla
Therefore, To produce upward force, using right hand value and taking particle in negative charge then the magnetic field has to be point in eastwards.
What is gravitational field?
In physics, a gravitational field is a model used to describe the effect of one massive object spreading out in space around it and creating a force on another massive object. Gravitational fields are used to describe gravitational phenomena and are measured in Newtons per kilogram.
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an earth satellite has its apogee at 2500 km above the surface of earth and perigee at 500 km above the surface of earth. at apogee its speed is 6260 m/s. what is its speed at perigee? earth's radius is 6370 km (see below).
When a satellite revolves around the Earth at a speed of v2=31300 m/s, there is no torque on the Earth.
What does the term "torque" mean?
A torque is an angular force that tends to generate rotation along an axis, which could be a fixed point or the center of mass. Torque can also be conceived of as a spinning object's capacity to overcome turning resistance, such as a gear or a shaft.
In vehicles, what does torque mean?
When used to describe internal combustion engines or electric motors, torque refers to the force acting on the driving shaft. Torque is measured in newton-meters or pounds-feet (lb-ft) (Nm). Engine power is determined by the relationship between torque and engine speed (rpm).
Briefing:
mv1r1=mv2r2
2500*6260=v2*500
v2=31300m/s
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a ferris wheel starts from rest and builds up to a final angular speed of 1.9 rad/s while rotating through an angular displacement of 4.9 rad. what is its average angular acceleration?
The average angular acceleration of Ferris wheel is 0.368m/s².
According to their position on the Ferris wheel, riders will feel "heavier" or "lighter" depending on the physics of the Ferris wheel, which is directly related to centripetal acceleration.The passenger gondolas (seats) for the ferris wheel are attached to the rim of an upright wheel. At the support where they are connected to the Ferris wheel, these gondolas can freely pivot. As a result, while the Ferris wheel is spinning, the gondolas always hang downward.ω=1.9rad/s
α=4.9rad
To find angular acceleration.
[tex]w^2=2\alpha s[/tex]
To find α:-
[tex]\alpha =\frac{w^2}{2s}[/tex]
=1.9 x 1.9/9.8
=0.368m/s²
To find angular acceleration-
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Nuclear decay occurs according to first-order kinetics. What is the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes?.
The half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes is 3.5 minutes.
Rate of first order reaction is given by:[tex]kt = 2.303 * log(R'/R)[/tex]
Where , k = rate of reaction
t= time = 2.5 minutes
R= final amount = 31.7g
R'= initial amount = 55.4g
Putting these values in above equation we get k = 0.22
Now half life of a first order reaction is given by: 0.693/k
Putting k= 0.22 , we get half life = 3.5 minutes.
So the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes is 3.5 minutes.
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the holding force in drawing is most likely to be (a) greater than, (b) equal to, or (c) less than the maximum drawing force?
In drawing, the holding force is most likely to be lower than the maximal drawing force.
Explain about the drawing force?By using a special method called FORCE Drawing, you can learn to see things more clearly and to comprehend what you are looking at. This will help you to draw from life and from your imagination with great talent and understanding.
All forces operating on an item, their direction, and their magnitude are represented in a force diagram. The image has been streamlined to only depict the forces.
The term "force diagram," sometimes known as a free body diagram, refers to a sketch in which all force vectors acting on an object are shown with their initial points at the location of the object.
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two inductors of self-inductance l1 and l2 are connected in parallel. the inductors are magnetically shielded from one another so that neither produces flux in the other. show that the self-inductance of the combination is given by 1 l
Voltage is proportional to inductance just as, for resistors, it is proportional to resistance. Now, the (independent) voltages for parallel elements are equal (V₁ = V₂) and the currents (which are generally functions of time) add i(t) = i₁(t) + i₂(t)
This leads to the equation,
i = i₁ + i₂ + i₃ = V [(1/R₁) + (1/R₂) + (1/R₃)] for resistors.
We note that this condition on the currents implies
d₁(t)/dt + d₂(t)/dt = d(it)/dt
Thus, although the inductance equation, ε = -L(di/dt) involves the rate of change of current, as opposed to current itself, the conditions that led to the parallel resistor formula also apply to inductors.
Therefore, 1/L(eq) = 1/L₁ + 1/L₂
Therefore to ensure the independence of the voltage values, it is important that the inductors not be too close together. The requirement is that the field of one inductor not to have significant influence (or "coupling") in the next.
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when testing the strength of grade a cotton fabric covering an aircraft that requires only intermediate grade, the minimum acceptable strength the fabric must have is
B- 70 percent of the original strength for intermediate fabric.
What is Fabric covering?
Fabrics are adaptable and employed in a wide range of industries, including clothing, agriculture, the military, and obviously the healthcare sector. More than you would imagine, specialty textiles are a part of our daily life. These textiles are generally flame resistant, mould and mildew resistant, and particularly treated with antibacterial properties for the healthcare sector. Why, I presume you ask? Because textiles used often in the medical field need to be antimicrobial and stain resistant from the start, this will help prevent bacteria from growing on the fabric surface.
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Air in an ideal Diesel cycle is compressed from 4 L to 0.25 L, and then it expands during the constant pressure heat addition process to 0.50 L. Under cold air standard conditions, determine the thermal efficiency of this cycle.
Air in an ideal Diesel cycle is compressed from 4 L to 0.25 L, and then it expands during the constant pressure heat addition process to 0.50 L. Under cold air standard conditions, the thermal efficiency of this cycle is 65.2%.
For an air standard engine with γ = 1.4, compression ratio r and fuel cut off ratio rc where r = V1/V2
and rc = V3/V2 and V1 = 4l, V2 = 0.25l and V3 = 0.50l
The efficiency (n) of diesel cycle is ----
n = 1 - [1 / r^(γ - 1)] * (rc^γ -1) / γ(rc - 1)
n = 1 - [1/(4/0.25)^(1.4-1)] * (0.50/0.25)^1.4 - 1 / 1.4 [(0.50/0.25) -1 ]
n = 1 - [1/3.03] * [2.63 - 1] / 1.4x1
n = 0.652
n% = 65.2%
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A cyclist is travelling along a track at 8 m/s when a rabbit runs out in front of them. they stop their bike in 1.6 seconds. calculate their deceleration.
The deceleration experienced by the cyclist is -5 m/s. Deceleration is also called negative acceleration.
What is deceleration?Deceleration is the term used to describe a decrease in speed as the body moves away from the beginning place. The opposite of acceleration is deceleration.
Given,
Initial velocity (V₁) = 8 m/s
Final velocity (V₂) = 0 m/s (Since the bike was stopped).
Time taken for the velocity drop (t) = 1.6 seconds
We know,
[tex]deceleration=\frac{V_{2}-V_{1} }{t} \\[/tex]
Substituting the values we get,
[tex]deceleration= \frac{0-8}{1.6}[/tex]
[tex]= -5 m/s[/tex]
Hence, the deceleration experienced by the cyclist is -5 m/s.
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The right answer is "-1.5 m/s²"
Answer explanation:
Acceleration = change in velocity / time
= (4 m/s – 7 m/s) / 2 s = -1.5 m/s2.
The acceleration is negative because the bike is slowing down.(decelarating)
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in the proton-proton chain, the mass of four protons is slightly greater than the mass of a helium nucleus. explain what happens to this "lost" mass.
The lost mass or mass defect that results in the mass of four protons being slightly greater than the mass of a helium nucleus is due to the conversion of matter to energy.
What is the lost mass in a nucleus of atoms?The lost mass or the mass defect is the difference in mass that is observed when the mass atoms of elements are compared to the sum of the mass of the constituents of all the particles in the nucleus of the atom.
For example, the mass of four protons is slightly greater than the mass of a helium nucleus that is also composed of four protons.
This loss in mass is known as the mass defect.
The loss in mass or mass defect is a result of the conversion of some of the mass of the particles to energy.
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a stuntman is being pulled along a rough road at a constant velocity, by a cable attached to a moving truck. the cable is parallel to the ground. the mass of the stuntman is 109 kg, and the coefficient of kinetic friction between the road and him is 0.870. find the tension in the cable.pdf
The tension in the cable is 929.334 N.
Solution:
The net force in the horizontal direction is T - F = 0.
Resolving vertically,
N = mg
The relationship between friction and reaction force is
[tex]F = \mu_{k}N[/tex]
[tex]T - \mu_{k} N = 0[/tex]
[tex]T = \mu_{k} mg[/tex]
= [tex](0.870)(109 kg) \times 9.8 \frac{m}{s^{2}}=(0.870)(109kg)[/tex] x 9.8ms²
N = 929.334N.
Tension refers to the force transmitted when a cable, rope, wire, or cord is knotted by forces acting on both ends. The cord is unidirectional along its length and pulls the object evenly at both ends of the cord. As lift increases, the total stress equals the sum of weight and force due to acceleration. As the lift is lowered, the total stress equals the difference in weight and force due to acceleration.
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