Questions from College Physics

Q: A house painter is standing on a uniform, horizontal platform that

A house painter is standing on a uniform, horizontal platform that is held in equilibrium by two cables attached to supports on the roof. The painter has a mass of 75 kg, and the mass of the platform...

Q: A spool of thread of mass m rests on a plane inclined

A spool of thread of mass m rests on a plane inclined at angle θ. The end of the thread is tied as shown. The outer radius of the spool is R, and the inner radius (where the thread is wou...

Q: What keeps a cloud from falling? A cumulus (fair-

What keeps a cloud from falling? A cumulus (fair-weather) cloud consists of tiny water droplets of average radius 5.0 μm. Find the terminal velocity for these droplets at 20°C, assuming viscous drag....

Q: A bicycle travels up an incline at constant velocity. The magnitude

A bicycle travels up an incline at constant velocity. The magnitude of the frictional force due to the road on the rear wheel is f = 3.8 N. The upper section of chain pulls on the sprocket wheel, whic...

Q: A flea is on the back of a squirrel climbing a tall

A flea is on the back of a squirrel climbing a tall tree. When the squirrel is near the top, the flea jumps off. (a) Assuming the drag force is viscous, estimate the terminal speed of the flea. Treat...

Q: A circus roustabout is attaching the circus tent to the top of

A circus roustabout is attaching the circus tent to the top of the main support post of length L when the post suddenly breaks at the base. The worker's weight is negligible relative to that of the un...

Q: The graph shows vx versus t for an object moving along the

The graph shows vx versus t for an object moving along the x-axis. (a) What is ax at t = 11 s? (b) What is ax at t = 3 s? (c) Sketch a graph of ax(t). (d) How far does the object travel from t = 1...

Q: When salmon head upstream to spawn, they may encounter a waterfall

When salmon head upstream to spawn, they may encounter a waterfall. If the water is not moving too fast, the salmon can swim right up through the falling water. Otherwise, the salmon jump out of the w...

Q: An aluminum sphere (specific gravity = 2.7) falling

An aluminum sphere (specific gravity = 2.7) falling through water reaches a terminal speed of 5.0 cm/s. What is the terminal speed of an air bubble of the same radius rising through water? Assume visc...

Q: A student stands on a platform that is free to rotate and

A student stands on a platform that is free to rotate and holds two dumbbells, each at a distance of 65 cm from his central axis. Another student gives him a push and starts the system of student, dum...