A ball is dropped from a building of height 100m. At the same time, another ball is then thrown vertically up from the ground with a velocity V0. They meet each other at the middle. What is the speed V0 of the ball thrown vertically up?
a) 44.3m/s
b)9.8m/s
c) 31.3m/s
d)19.6 m/s
e) 98.0m/s
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A charge of 3.06 is held fixed at the origin. A second charge of 3.06 is released from rest at the position (1.11 m, 0.524 m). If the mass of the second charge is 2.73 g, what is its speed when it moves infinitely far from the origin? At what distance from the origin does the 3.06 charge attain half the speed it will have at infinity?
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A 1.50 mol sample of an ideal gas with a molar specific heat of CV = 5/2 R always starts at pressure 2.00 ✕ 105 Pa and temperature 250 K. For each of the following processes, determine the final pressure (Pf, in kPa), the final volume (Vf, in L), the final temperature (Tf, in K), the change in internal energy of the gas (ΔEint, in J), the energy added to the gas by heat (Q, in J), and the work done on the gas (W, in J). (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.)
(a) The gas is heated at constant pressure to 370 K.
Pf =_______ kPa
Vf =_______ L
Tf =_______ K
ΔEint_______= J
Q =_______ J
W =_______ J
(b) The gas is heated at constant volume to 370 K.
Pf =_______ kPa
Vf =_______ L
Tf =_______ K
ΔEint_______= J
Q =_______ J
W =_______ J
(c) The gas is compressed at constant temperature to 240 kPa.
Pf =_______ kPa
Vf =_______ L
Tf =_______ K
ΔEint_______= J
Q =_______ J
W =_______ J
(d) The gas is compressed adiabatically to 240 kPa.
Pf =_______ kPa
Vf =_______ L
Tf =_______ K
ΔEint_______= J
Q =_______ J
W =_______ J
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A) A car travels at a constant speed of 32.5 mi/h (14.5 m/s) on a level circular turn of radius 49.0 m, as shown in the bird's-eye view in figure a. What minimum coefficient of static friction, μs, between the tires and the roadway will allow the car to make the circular turn without sliding?
B) At what maximum speed can a car negotiate a turn on a wet road with coefficient of static friction 0.215without sliding out of control? The radius of the turn is 25.5 m.
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people wearing prism goggles, which shift the visual world left or right by small, quickly adapt to the distortion. suppose you were wearing goggles that completely reversed everything along the left-right dimension, as if you were viewing the world in a mirror, with objects to your right appearing to be on your left, and objects appearing to be on your left appearing to be on your right. would you be able to adapt to this sort of distortion? explain your answer.
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1) a)Godzilla crushes a subway car between his two hands by pressing against its ends. The force applied at each end can be described as
options:
a tensile force
a compressive force
a shearing force
a bulk force
a and b
b) You place your flat hand on top of a textbook which is lying flat on the desk. You gently push against (along) the book cover in the direction parallel to the surface of the desk, causing the shape of the book to distort slightly. The parallel force you applied can be described as
options:
a tensile force
a compressive force
a shearing force
a bulk force
a and b
c) Two teams stretch a rope in a game of tug-of-war. The applied force from each of the two teams can be described as
options:
a tensile force
a compressive force
a shearing force
a bulk force
a and b
d) The units of Young's modulus, the shear modulus, and the bulk modulus are
options:
all N/m
all N/m2
all N/m3
N/m, N/m2, N/m3
all dimensionless
e) Stress divided by strain has units of
options:
Newtons
Newton meter
Newton per meter
Newton per square meter
none; it's dimensionless
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If the average drift speed of an electron is very slow, how can there by a current on the order of 1 or 2 ampere in a circuit if the drift speed is only about 1 meter per hour?
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9. A 60 kg football receiver starts from rest, accelerating at a rate of 0.36 g’s for 1.42 seconds until he runs as fast as he can. A ball of mass 0.25 kg is thrown, and the player catches the ball 3.35 seconds after the play starts. If the ball is travelling at 16 m/s when the player catches it, (a) how far down field did the player catch it, (b) what will the player’s final speed be after catching the ball, (c) what are the kinetic energies of the ball and player separately before the catch, and (d) what is the kinetic energy of the ball – player system after the catch? (e) Compare your results of (c) and (d) and explain.
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To push a crate of mass 55 kg up a frictionless
ramp with an angle of 50 ° to the horizontal, a
worker exerts a force of 1050 N parallel to the
incline.
The crate moves a distance of 5 m
What work is done on the crate by the worker?
J
| Tries 0/2 |
What work is done by the weight of the crate?
J
| Tries 0/2 |
What work is done by the normal force exerted by the floor on the
crate??
J
| Tries 0/2 |
What is the total work done on the crate?
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In a short essay ( 100 words ) answer the above the question.
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An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 16.0 N. When completely submerged in water, its apparent weight is 13.4 N. What is the volume of the object? m3 The density of ethyl alcohol at zero degrees Celsius is 806 kg/m3.
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