Questions from College Physics

Q: How much work is done on the bowstring of Example 6.

How much work is done on the bowstring of Example 6.9 to draw it back by 20.0 cm? [Hint: Rather than recalculate from scratch, use proportional reasoning.]

Q: A Nile cruise ship takes 20.8 h to go upstream

A Nile cruise ship takes 20.8 h to go upstream from Luxor to Aswan, a distance of 208 km, and 19.2 h to make the return trip downstream. Assuming the ship’s speed relative to the water is the same in...

Q: A large parallel plate capacitor with air between the plates has plate

A large parallel plate capacitor with air between the plates has plate separation 1.00 cm and plate area 314 cm2. The capacitor is connected to a 20.0 V battery and then disconnected. How much work is...

Q: Is it possible for two identical projectiles with identical initial speeds,

Is it possible for two identical projectiles with identical initial speeds, but with two different angles of elevation, to land in the same spot? Explain. Ignore air resistance and sketch the trajecto...

Q: What is the acceleration of an object thrown straight up into the

What is the acceleration of an object thrown straight up into the air at the highest point of its motion? Does the answer depend on whether air resistance is negligible or not? Explain.

Q: If the trajectory is parabolic in one reference frame, is it

If the trajectory is parabolic in one reference frame, is it always, never, or sometimes parabolic in another reference frame that moves at constant velocity with respect to the first reference frame?...

Q: An ideal transformer takes an ac voltage of amplitude 170 V as

An ideal transformer takes an ac voltage of amplitude 170 V as its input and supplies a 7.8 V amplitude to a circuit that converts it to dc. The primary has 300 turns. (a) How many turns does the sec...

Q: If air resistance is ignored, what force(s) act

If air resistance is ignored, what force(s) act on an object in free fall?

Q: Why might an elevator cable break during acceleration when lifting a lighter

Why might an elevator cable break during acceleration when lifting a lighter load than it normally supports at rest or at constant velocity?

Q: You are standing on a balcony overlooking the beach. You throw

You are standing on a balcony overlooking the beach. You throw a ball straight up into the air with speed vi and throw an identical ball straight down with speed vi. Ignoring air resistance, how do th...