Questions from College Physics

Q: An intergalactic spaceship is traveling through space far from any planets or

An intergalactic spaceship is traveling through space far from any planets or stars, where no human has gone before. The ship carries a crew of 30 people (of total mass 2.0 × 103 kg). If the speed of...

Q: The average density of a fish can be found by first weighing

The average density of a fish can be found by first weighing it in air and then finding the scale reading for the fish completely immersed in water and suspended from a scale. If a fish has weight 200...

Q: A uniform rod of length 30.0 cm is bent into

A uniform rod of length 30.0 cm is bent into the shape of an inverted U. Each of the three sides is of length 10.0 cm. Find the location, in x- and y-coordinates, of the CM as measured from the origin...

Q: You suspend the coin from a spring scale and find that its

You suspend the coin from a spring scale and find that its mass is 49.7 g. You then let the coin hang completely submerged in a glass of water but not touching the bottom and find that the scale reads...

Q: A child places 12 wooden blocks together, as shown in the

A child places 12 wooden blocks together, as shown in the figure. If each block has the same mass and density, where is the CM of these blocks? Each block is a cube with sides of 1.0 inch length. The...

Q: On a kitchen scale you measure the coin’s mass to be 49

On a kitchen scale you measure the coin’s mass to be 49.7 g. You measure the mass of a small bowl of water as 314.8 g. You tie a slender thread around the coin and suspend it completely submerged in t...

Q: To contain a violent mob, the riot squad approaches with fire

To contain a violent mob, the riot squad approaches with fire hoses. Suppose that the rate of flow of water through a fire hose is 24 kg/s, and the stream of water from the hose moves at 17 m/s. What...

Q: A helicopter is flying horizontally at 8.0 m/s

A helicopter is flying horizontally at 8.0 m/s and an altitude of 18 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 12 m/s relative to the helicopter....

Q: In the circuit / and R = 100.0

In the circuit and R = 100.0 Ω. Assume the emf is ideal. If a voltage Vx = 30.0 V is needed for a circuit, what should resistance Rx be?

Q: (a) A piece of balsa wood with density 0.

(a) A piece of balsa wood with density 0.50 g/cm3 is released under water. What is its initial acceleration? (b) Repeat for a piece of maple with density 0.750 g/cm3. (c) Repeat for a ping-pong ball...