Questions from College Physics

Q: The volume flow rate of the water supplied by a well is

The volume flow rate of the water supplied by a well is 2.0 × 10−4 m3/s. The well is 40.0 m deep. (a) What is the power output of the pump—in other words, at what rate does the well do work on the wa...

Q: A uniform solid cylinder rolls without slipping or sliding down an incline

A uniform solid cylinder rolls without slipping or sliding down an incline. The angle of inclination is 60.0°. Use energy considerations to find the cylinder's speed after it has traveled a distance o...

Q: Using Poiseuille’s law [Eq. (9-41)], show

Using Poiseuille’s law [Eq. (9-41)], show that viscosity has SI units of pascal-seconds.

Q: A person on a bicycle (combined total mass 80.0

A person on a bicycle (combined total mass 80.0 kg) starts from rest and coasts down a hill to the bottom 20.0 m below. Each wheel can be treated as a hoop with mass 1.5 kg and radius 40 cm. Ignore fr...

Q: A viscous liquid is flowing steadily through a pipe of diameter D

A viscous liquid is flowing steadily through a pipe of diameter D. Suppose you replace it by two parallel pipes, each of diameter D/2, but the same length as the original pipe. If the pressure differe...

Q: A painter (mass 61 kg) is walking along a trestle

A painter (mass 61 kg) is walking along a trestle, consisting of a uniform plank (mass 20.0 kg, length 6.00 m) balanced on two sawhorses. Each sawhorse is placed 1.40 m from an end of the plank. A pai...

Q: What does it mean when we refer to a cord as an

What does it mean when we refer to a cord as an “ideal cord” and a pulley as an “ideal pulley”?

Q: A Ferris wheel rotates because a motor exerts a torque on the

A Ferris wheel rotates because a motor exerts a torque on the wheel. The radius of the London Eye, a huge observation wheel on the banks of the Thames, is 67.5 m and its mass is 1.90 × 106 kg. The cru...

Q: A hypodermic syringe is attached to a needle that has an internal

A hypodermic syringe is attached to a needle that has an internal radius of 0.300 mm and a length of 3.00 cm. The needle is filled with a solution of viscosity 2.00 × 10−3 Pa·s; it is injected into a...

Q: An experimental flywheel, used to store energy and replace an automobile

An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 200.0 kg and radius 0.40 m. (a) What is its rotational inertia? (b) When driving at 22.4 m/s...