Q: A roller coaster car (mass = 988 kg including passengers)
A roller coaster car (mass = 988 kg including passengers) is about to roll down a track. The diameter of the circular loop is 20.0 m and the car starts out from rest 40.0 m above the lowest point of t...
See AnswerQ: When a ball is dropped to the floor from a height h
When a ball is dropped to the floor from a height h, it strikes the ground and briefly undergoes a change of shape before rebounding to a maximum height less than h. Explain why it does not return to...
See AnswerQ: A gymnast is swinging in a vertical circle about a crossbar.
A gymnast is swinging in a vertical circle about a crossbar. In terms of energy conservation, explain why the speed of the gymnast’s body is slowest at the top of the circle and fastest at the bottom....
See AnswerQ: A bicycle rider notices that he is approaching a steep hill.
A bicycle rider notices that he is approaching a steep hill. Explain, in terms of energy, why the bicyclist pedals hard to gain as much speed as possible on level road before reaching the hill.
See AnswerQ: A cheetah can accelerate from rest to 24 m/s in
A cheetah can accelerate from rest to 24 m/s in 2.0 s. Assuming the acceleration is constant over the time interval, (a) what is the magnitude of the acceleration of the cheetah? (b) What is the dis...
See AnswerQ: (a) Calculate the net electric force acting on the dipole
(a) Calculate the net electric force acting on the dipole. (b) Show that the magnitude of the torque on the dipole is τ = qEd sin θ. (c) Calculate the torque acting on the dipole for θ = 0, 36.9°, a...
See AnswerQ: (a) Find the electric flux through each side of a
(a) Find the electric flux through each side of a cube of edge length a in a uniform electric field of magnitude E. The field direction is perpendicular to two of the faces. (b) What is the total flu...
See AnswerQ: You are trapped on the second floor of a burning building.
You are trapped on the second floor of a burning building. The stairway is impassable, but there is a balcony outside your window. Describe what might happen in the following situations. (a) You jump...
See AnswerQ: An airplane has a velocity relative to the ground of 210 m
An airplane has a velocity relative to the ground of 210 m/s toward the east. The pilot measures his airspeed (the speed of the plane relative to the air) to be 160 m/s. What is the minimum wind veloc...
See AnswerQ: Two objects with different masses have the same kinetic energy. Which
Two objects with different masses have the same kinetic energy. Which has the larger magnitude of momentum?
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