Questions from College Physics

Q: Because of Earth’s rotation about its axis, a point on the

Because of Earth’s rotation about its axis, a point on the equator has a centripetal acceleration of 0.034 0 m/s2, whereas a point at the poles has no centripetal acceleration. (a) Show that, at the e...

Q: A roller coaster travels in a circular path. (a

A roller coaster travels in a circular path. (a) Identify the forces on a passenger at the top of the circular loop that cause centripetal acceleration. Show the direction of all forces in a sketch. (...

Q: In Robert Heinlein’s The Moon Is a Harsh Mistress, the colonial

In Robert Heinlein’s The Moon Is a Harsh Mistress, the colonial inhabitants of the Moon threaten to launch rocks down onto Earth if they are not given independence (or at least representation). Assumi...

Q: A model airplane of mass 0.750 kg flies with a

A model airplane of mass 0.750 kg flies with a speed of 35.0 m/s in a horizontal circle at the end of a 60.0-m control wire as shown in Figure P7.60a. The forces exerted on the airplane are shown in F...

Q: The tires on a new compact car have a diameter of 2

The tires on a new compact car have a diameter of 2.0 ft and are warranted for 60000 miles. (a) Determine the angle (in radians) through which one of these tires will rotate during the warranty period...

Q: A bicycle tire is spinning clockwise at 2.50 rad/

A bicycle tire is spinning clockwise at 2.50 rad/s. During a time period Δt = 1.25 s, the tire is stopped and spun in the opposite (counterclockwise) direction, also at 2.50 rad/s. Calculate (a) The c...

Q: A potter’s wheel moves uniformly from rest to an angular velocity of

A potter’s wheel moves uniformly from rest to an angular velocity of 1.00 rev/s in 30.0 s. (a) Find its angular acceleration in radians per second per second. (b) Would doubling the angular accelerati...

Q: Objects moving along a circular path have a centripetal acceleration provided by

Objects moving along a circular path have a centripetal acceleration provided by a net force directed towards the center. Identify the force(s) providing the centripetal acceleration in each of these...

Q: A dentist’s drill starts from rest. After 3.20 s

A dentist’s drill starts from rest. After 3.20 s of constant angular acceleration, it turns at a rate of 2.51 x 104 rev/min. (a) Find the drill’s angular acceleration. (b) Determine the angle (in radi...

Q: Because of Earth’s rotation about its axis, you weigh slightly less

Because of Earth’s rotation about its axis, you weigh slightly less at the equator than at the poles. Explain.