Answer:
-2.83 m/s²
Explanation:
Initial velocity (u) = 34 m/sFinal velocity (v) = 17 m/sTime taken (t) = 6 seconds❖ Acceleration is defined as the rate of change in velocity with time.
→ a = (v - u)/t
v denotes final velocitya denotes accelerationu denotes initial velocityt denotes time→ a = (17 - 34)/6 m/s²
→ a = -17/6 m/s²
→ Acceleration = -2.83 m/s²(Minus sign implies that the velocity is decreasing.)
its un1) It is unofficial, but a strong rumor that the world will end in two years' time due to the arrival of a huge comet and its subsequent impact with Earth. You have two years to live, to get the most out of life. How would you react? What would you do? Discuss.
Answer:
I'll try my utmost best to get the most out of life...I'd do the things have always wanted to do
Sometimes it might get to me knowing fully well that in two years time the world will end but i will shake it off because the time i spend thinking about it...It will be enough to make some memories.
Hope this help anyways
1. A hydraulic lift is to be used to lift a truck masses 5000 kg. If the diameter of the
small piston and large piston of the lift is 5 cm and 1 m respectively,
a. What gauge pressure in Pa must be applied to the oil?
b. What is the magnitude of the force required on the small piston to lift the truck?
Answer:
a) F = 4.9 10⁴ N, b) F₁ = 122.5 N
Explanation:
To solve this problem we use that the pressure is transmitted throughout the entire fluid, being the same for the same height
1) pressure is defined by the relation
P = F / A
to lift the weight of the truck the force of the piston must be equal to the weight of the truck
∑F = 0
F-W = 0
F = W = mg
F = 5000 9.8
F = 4.9 10⁴ N
the area of the pisto is
A = pi r²
A = pi d² / 4
A = pi 1 ^ 2/4
A = 0.7854 m²
pressure is
P = 4.9 104 / 0.7854
P = 3.85 104 Pa
2) Let's find a point with the same height on the two pistons, the pressure is the same
[tex]\frac{F_1}{A_1} = \frac{F_2}{A_2}[/tex]
where subscript 1 is for the small piston and subscript 2 is for the large piston
F₁ = [tex]\frac{A_1}{A_2} \ F_2[/tex]
the force applied must be equal to the weight of the truck
F₁ = [tex]( \frac{d_1}{d_2} )^2\ m g[/tex]
F₁ = (0.05 / 1) ² 5000 9.8
F₁ = 122.5 N
How much stronger is the electric force between two
protons than the gravitational force between them?
Answer:
Explanation:
The electric force between two protons is 10^36 times stronger than the gravitational force between them.
Answer:
Electric force is 1.23 x 10³⁶ times stronger than gravitational force.
Explanation:
First, we will calculate the gravitational force using Newton's Law:
[tex]F_G = \frac{Gm^2}{r^2}\\\\[/tex]
where,
F_G = Gravitational Force = ?
G = Gravitational Constant = 6.67 x 10⁻¹¹ Nm²/kg²
m = mass of proton = 1.67 x 10⁻²⁷ kg
r = distance between protons
Therefore,
[tex]F_G = \frac{(6.67\ x\ 10^{-11}\ Nm^2/kg^2)(1.67\ x\ 10^{-27}\ kg)^2}{r^2}\\\\F_G = \frac{1.86\ x\ 10^{-64}\ Nm^2}{r^2}\\\\[/tex]
Now, we will calculate the electrostatic force using Colomb's Law:
[tex]F_E = \frac{kq^2}{r^2}\\\\[/tex]
where,
F_E = Electrostatic Force = ?
k = Colomb's Constant = 9 x 10⁹ Nm²/C²
q = charge of proton = 1.6 x 10⁻¹⁹ C
r = distance between protons
Therefore,
[tex]F_E = \frac{(9\ x\ 10^{9}\ Nm^2/kg^2)(1.6\ x\ 10^{-19}\ C)^2}{r^2}\\\\F_E = \frac{2.3\ x\ 10^{-28}\ Nm^2}{r^2}\\\\[/tex]
Dividing both forces:
[tex]\frac{F_E}{F_G} = \frac{2.3\ x\ 10^{-28}}{1.86\ x\ 10^{-64}}[/tex]
F_E = 1.23 x 10³⁶ F_G
Therefore, electric force is 1.23 x 10³⁶ times stronger than gravitational force.
Give five reasons for liming pond
When we experience positive "g forces", it is as if we have become...
Answer:
heavier
Explanation:
The formula length x width x height is used to calculate the volume of a type of
Answer: 3 dimensional solid like cubes and parallelepipeds
Explanation:
A torsional pendulum has a centroidal mass moment of inertia of 0.40 kg·m2 and when given an initial twist and released is found to have a frequency of oscillation of 200 rpm. Knowing that when this pendulum is immersed in oil and given the same initial condition it is found to have a frequency of oscillation of 180 rpm, determine the damping constant for the oil. The damping constant for the oil is
Knowing that when this pendulum is immersed in oil and given the same initial condition it is found to have a frequency of oscillation of 180 rpm,0.00246914 come to the damping of the constant for the oil
what is frequency ?
The frequency can be defined as the number of oscillation per unit time which is used for defining the cyclic process like rotation, oscillation, wave etc.
The SI unit of the frequency is denoted as Hertz and the symbol λ represents it where one hertz means the wave completed one cycle in one second.
The frequency which explains the phenomenon of oscillatory and vibration like the mechanical vibration, sound signals, light, frequency waves etc. The “period” represented as the time required by the wave for one oscillation, i.e., it is inversely proportional to the frequency.
If the flashes, then the period is the time between the two flashes. And the frequency is the total number of flashes per second.
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Four 15 Ω resistors are connected in series with a 45 V battery. What is the current in the circuit?
Answer:
3A
Explanation:
Resistance=R=15
Voltage=45volts
we know that[tex]\boxed{\sf Current=\dfrac{Voltage}{Resistance}}[/tex]
[tex]\\ \tt \mapsto \:Current=\dfrac{45}{15}[/tex]
[tex]\\ \tt \mapsto \:Current=\dfrac{3A}[/tex]
The current of the circuit is 0.75 amps
The first step is to write out the parameters
Four resistors of 15 in series
15+15+15+15
= 60
voltage= 45
Current= 45/60
= 0.75
Hence the current is 0.75 amps
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A square loop of wire with a small resistance is moved with constant speed from a field free region into a region of uniform B field (B is constant in time) and then back into a field free region to the left. The self inductance of the loop is negligible. True While the loop is entirely in the field, the emf in the loop is zero. False When entering the field the coil experiences a magnetic force to the left. False When leaving the field the coil experiences a magnetic force to the right. True Upon entering the field, a clockwise current flows in the loop.
Answer:
False, True, False, True
Explanation:
Given a square loop of a wire having a small resistance and moving with a constant sped from the free region to a region having a region having a uniform field B. It is then moved back to the left in the free field region.
For the following statements :
While the loop is entirely in the field, the emf in the loop is zero. -- TRUE
The emf of the coil is zero when the coil moves into the field from a free region field to a uniform field region field.
When entering the field the coil experiences a magnetic force to the left ---- FALSE
According to the Lenz law, a loop entering the field opposes it and moves towards the right.
When leaving the field the coil experiences a magnetic force to the right. --- TRUE
Upon entering the field, a clockwise current flows in the loop. ---- TRUE
In the field the coil or the loop tries to oppose the magnetic field and forces the current in the loop to move in a clockwise direction.
A 9-V battery is hooked up to a 330-Ω resistor. What current is flowing through this circuit?
Group of answer choices
0.027 A
2970 A
36.6 A
6 A
Answer:
option a 0.027 A
Explanation:
I = V/R
-> 9/330 = 0.027
Sodium and ice a physical or chemical reaction
Answer:
physical change uwu owo hope this helps you uwu silly goose
The block A and attached rod have a combined mass of 50 kg and are confined to move along the guide under the action of the 796-N applied force. The uniform horizontal rod has a mass of 15 kg and is welded to the block at B. Friction in the guide is negligible.
Required:
Compute the bending moment M exerted by the weld on the rod at B. The bending moment is positive if counterclockwise, negative if clockwise.
Answer:
The bending moment is 459.16 N.m
Explanation:
From the given information;
Let's assume that the angle is 66°
Then, the free body diagram is draw and attached in the file below.
Now, the calculation of the acceleration from the first part of the free body diagram is:
[tex]\sum F_x = ma_x \\ \\ 796 - 50(9.81) sin 66=50a \\ \\ 796 - 448.094 = 50 a \\ \\ a = \dfrac{347.906}{50} \\ \\ a = 6.96 \ m/s^2[/tex]
Bending moment M:
From the second part of the diagram:
[tex]\sum M_B = mad \\ \\ M - (15 \times 9.81) (1.5) = (25 \times 6.96)(1.5 sin 66) \\ \\ M - 220.725 = 238.435 \\ \\ M = 238.435 + 220.725 \\ \\ \mathbf{M = 459.16 \ N.m}[/tex]
The Hall effect is to be used to find the sign of charge carriers in a semiconductor sample. The probe is placed between the poles of a magnet so that magnetic field is pointed up. A current is passed through a rectangular sample placed horizontally. As current is passed through the sample in the east direction, the north side of the sample is found to be at a higher potential than the south side. Make a sketch of the situation, then decide if the number density of charge carriers is positively or negatively charged.
Answer:
the sign of these carriers is POSITIVE
Explanation:
In the effect, he found the charge carriers that were subjected to two forces, one electric and the other magnetic.
F = F_e + F_m = q E + q v x B
bold indicates vectors
The electric field goes to the east, therefore the current also has this direction, the vector product of the velocity of the charge carriers towards the east and the magnetic field upwards, using the right hand rule a magnetic force is created towards the north if the carriers are positive.
In the exercise they indicate that the north side has a higher potential than the south side, therefore there must be an accumulation of carriers on this side that create an electric field (Hall) that is put to the magnetic force until reaching equilibrium when the total force is zero.
Therefore the sign of these carriers is POSITIVE
A 100-turn, 7.0-cm-diameter coil is made of 0.50-mm-diameter copper wire. A magnetic field is perpendicular to the coil. At what rate must B increase to induce a 2.0 A current in the coil?
Answer:
The rate of increase of the magnetic field is 0.0311 T/s.
Explanation:
Given;
number of turns of the coil, N = 100 turn
diameter of the coil, D = 7.0 cm = 0.07 m
diameter of the copper wire, d = 0.5 mm = 0.5 x 10⁻³ m
induced current, I = 2.0 A
The induced emf is calculated as;
[tex]emf = IR = NA\frac{dB}{dt}\\\\\frac{dB}{dt} = \frac{IR}{NA} \\\\Where; A \ is \ area \ of \ the \ coil = \frac{\pi D^2}{4}\\\\[/tex]
[tex]\frac{dB}{dt}[/tex] is the rate of increase of the magnetic field, B
R is the resistance of the copper wire
[tex]R = \frac{\rho L}{A} = \frac{\rho D}{A}= \frac{\rho D}{\frac{\pi d^2}{4} }[/tex]
Where; ρ is the resistivity of copper wire = 1.68 x 10⁻⁸ Ωm
[tex]R = \frac{(1.68 \times 10^{-8})(0.07)}{\frac{\pi (0.5\times 10^{-3})^2}{4} } \\\\R = 5.989 \times 10^{-3} \ ohms[/tex]
[tex]\frac{dB}{dt} = \frac{(2)(5.989 \times 10^{-3})}{(100)(\frac{\pi \times (0.07)^2}{4} )} \\\\\frac{dB}{dt} =0.0311 \ T/s[/tex]
Therefore, the rate of increase of the magnetic field is 0.0311 T/s.
A 1.55 kg frictionless block is attached to an ideal spring with force constant 340 N/m . Initially the spring is neither stretched nor compressed, but the block is moving in the negative direction at 14.0 m/s.
A.) Find the amplitude of the motion.
B.) Find the maximum acceleration of the block.
C.) Find the maximum force the spring exerts on the block.
Answer:
Explanation:
Let amplitude be A . At displacement A , velocity will be zero , so
1/2 k A² = 1/2 m v²
340 A² = 1.55 x 14²
A = .9452 m
= 94.52 cm
B ) angular frequency of oscillation ω = √ ( k / m )
= √ ( 340 / 1.55 )
ω = 14.81 radian /s
maximum acceleration = ω²A
= 14.81² x 0.9452
= 207.32 m/s²
C) Maximum force = mass x maximum acceleration
= 1.55 x 207.32
= 321.36 N .
A truck contains both hydraulic brakes (reliability 0.96) and mechanical brakes (reliability 0.99). What is the probability of stopping the truck (i) while moving at a high speed, assuming both systems must work to avoid hitting a vehicle stalled in the roadway, and (ii) while moving at a low speed, assuming either system will stop the truck in time if they function properly
Answer:
i) 0.9504
ii) 0.0452
Explanation:
Given data: reliability of hydraulic brakes= 0.96
reliability of mechanical brakes = 0.99
So the probability of stopping the truck = 0.96×0.99= 0.9504
At low speed
case: A works and B does not
= 0.96×(1-0.99) = 0.0096
case2 : B works and A does not
= 0.99×(1-0.96) = 0.0396
Therefore, probality of stopping = 0.0096+0.0396 = 0.0492
a car travels a distance of 1600km in 24hr .what was it's speed
Answer:
66.66 or 66.67
Explanation:
If unlike magnetic poles attract, how does a magnet attract an un-magnetized piece of metal such as a piece of iron?
A
It does this via a process called magnetic induction which temporarily makes a magnet of the metal.
B
It can only do this if the piece of metal already is a magnet internally.
C
What actually happens is that the un-magnetized metal attracts the magnet rather than the other way around.
D
Only powerful electro-magnets, such as are found in wrecking yards, can attract unmagnetized metals.
Answer:
A
Explanation:
The lets say the magnet is is facing the north and a piece of iron is near it. The iron will become magnetized since the protons will be repelled leaving only the electrons creating a magnetic field. Or in other words a temporary magnet is made, this is only as long a the actual magnet is close enough to the iron.
What would happen if I removed the battery from the circuit?
Answer:
The current would stop
Explanation:
Electric currents are interesting because they carry little to no momentum. As soon as you remove a power source, the whole current halts.
A house is advertised as having 1460 square feet under roof. What is the area of this house in square meters?
Answer: 131.92 m
Explanation: The problem give above is a conversion problem. To convert any measurement from one unit to another, we need a relation for the original units to that of the desired unit. This relation is called the conversion factor. It is used by multiplying or dividing the factor depending on what is the unit of the original measurement. For this case, we need to convert from ft^2 to m^2. The conversion factor would be 1 foot is equal to 0.3048 m. So, we would be getting the square of the factor and then multiply to the original value.
1420 ft^2 ( 0.3048 m / 1 ft)^2 = 131.92 m
Determine which characteristics are chemical properties. Explain. A) IV. This property can only be determined by chemical reacting the sample of sulfur. B) I and II. These properties can only be determined by chemical reacting the sample of sulfur. C) III. These properties can be determined by physical measurements. The sulfur does not need to react, chemically, in order to measure these properties. D) III and IV. These properties can be determined by physical measurements. The sulfur does not need to react, chemically, in order to measure these properties.
Answer:
Explanation:
The choices are:
A) IV. This property can only be determined by chemical reacting the sample of sulfur.
B) I and II. These properties can only be determined by chemical reacting the sample of sulfur.
C) III. These properties can be determined by physical measurements. The sulfur does not need to react, chemically, in order to measure these properties.
C) III. These properties can be determined by physical measurements. The sulfur does not need to react, chemically, in order to measure these properties.
The answer is A and B as both characteristics can only be determined by chemical reacting so they are chemical properties.
Answer:
a
Explanation:
i just did this on usatestprep.
PLEASE HELP I need help bad
66. Which of the following results of correlational
studies implies that environment contributes to
the determination of IQ?
(A) Correlations are higher for identical twins
than for fraternal twins.
(B) Correlations are higher for children and their
biological parents than for children and their
adoptive parents.
(C) Correlations are higher for parents and their
children than for husbands and wives.
(D) Correlations for two children in the same
family are lower when one of the children is
adopted than when both are the biological
offspring of the parents.
(E) Correlations for children and their adoptive
parents are statistically significant and
positive.
i think the answer is B.
i believe this because the child’s brain development is proven to have changed based off separation from their biological parents, presenting a change in their environment
i hope this helps ! ♡
Correlational study involves a non-experimental study of the relationship between two variables using statistical study in the evaluation of our result.
The association between environment and IQ in the options given is best identified by the statistical significance shown in the association between children and their adoptive parent.
Correlational study involves the establishment of statistical pattern or trend using methods such as Analysis of variance. Statistical evaluation is key in establishing the outcome of a correlational study or evaluation. Since the method by which the correlation between the variables in the other options aren't stated, the best option is E.Therefore, correlation between adoptive parent and children showing positive statistical significance implies a correlational study.
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Kendra wonders how she ended up with brown hair, hazel eyes, and is right handed. Using the terms amino acids, genes, proteins, and traits, explain how she ended up with these features.
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Photo used to help with the question is below!! Please answer! Will mark BRAINLIEST!
⬇⬇⬇⬇⬇⬇⬇
Hot air near the surface of a road in summer can create a mirage that looks like a puddle of water. The puddles are actually light waves from the sun that are refracted to your eyes.
-True
-False
help PLEASEEEEEEEEEEE
A heat engine operating between a pair of hot and cold reservoirs with respective temperatures of 500 K and 200 K will have what maximum efficiency?
A) 60%
B) 50%
C) 40%
D) 30%
Answer:
The maximum efficiency of the heat engine is 60%.
Explanation:
Given that,
The temperature of hot reservoir = 500 K
The temperature of cold reservoir = 200 K
We need to find the maximum efficiency. The formula for the efficiency of heat engine is given by :
[tex]\eta=1-\dfrac{T_c}{T_H}[/tex]
Put all the values,
[tex]\eta=1-\dfrac{200}{500}\\\\\eta=0.6[/tex]
or
[tex]\eta=60\%[/tex]
So, the maximum efficiency of the heat engine is 60%.
2. A piece of alloy has a measured mass of 86g in air and 73 g when immersed in water. Find its
(a) volume
(b) density
Answer:
Hello There!!
Explanation:
a)The volume is 13 cc.(i think)
b)The density is 86/13 = 6.62.
hope this helps,have a great day!!
~Pinky~
How much stronger is the electric force between two protons than the gravitational force between them?
Answer:
The electric force between two protons is 10^36 times stronger than the gravitational force between them.
Explanation:
Answer:
[tex]F_e=1.23\times 10^{36}\times F_G[/tex]
Explanation:
The charge on proton is [tex]1.6\times 10^{-19}\ C[/tex]
The mass of proton is [tex]1.67\times 10^{-27}\ kg[/tex]
The electric force between two charges is given by :
[tex]F_e=\dfrac{kq^2}{r^2}\ ......(1)[/tex]
The gravitational force between two protons is given by :
[tex]F_G=G\dfrac{m^2}{r^2}\ ......(2)[/tex]
From equations (1) and (2).
[tex]\dfrac{F_e}{F_G}=\dfrac{kq^2}{Gm^2}\\\\=\dfrac{9\times 10^9\times (1.6\times 10^{-19})^2}{6.67\times 10^{-11}\times (1.67\times 10^{-27})^2}\\\\=1.23\times 10^{36}\\\\F_e=1.23\times 10^{36}\times F_G[/tex]
So, the electric force between two protons is [tex]1.23\times 10^{36}[/tex] times that of the gravitational force between them.
please help meeeee :((((((((((
Answer:
hello me
Explanation:
help me thisanswer
describe los ejercicios que caliente las extremidades superiores del cuerpo
Answer:
todas las cosas que la cuerda de salto hará
Explanation:
1. Mueva suavemente las muñecas y prepárese para levantar la parte superior del cuerpo.
2.Activa tus hombros sin presionarlos.
3. Calienta todo tu cuerpo elevando tu frecuencia cardíaca y cebando para la coordinación de todo el cuerpo que necesitas para el entrenamiento de la parte superior del cuerpo.