Questions from Modern Physics

Q: From the top of a tall building, you throw one ball

From the top of a tall building, you throw one ball straight up with speed v0 and one ball straight down with speed v0. (a) Which ball has the greater speed when it reaches the ground? (b) Which ball...

Q: A bird flies in the xy-plane with a velocity vector

A bird flies in the xy-plane with a velocity vector given by v =(a - bt2)

Q: A sly 1.5-kg monkey and a jungle veterinarian

A sly 1.5-kg monkey and a jungle veterinarian with a blow-gun loaded with a tranquilizer dart are 25 m above the ground in trees 70 m apart. Just as the veterinarian shoots horizontally at the monkey,...

Q: Birds of prey typically rise upward on thermals. The paths these

Birds of prey typically rise upward on thermals. The paths these birds take may be spiral-like. You can model the spiral motion as uniform circular motion combined with a constant upward velocity. Ass...

Q: In fighting forest fires, airplanes work in support of ground crews

In fighting forest fires, airplanes work in support of ground crews by dropping water on the fires. For practice, a pilot drops a canister of red dye, hoping to hit a target on the ground below. If th...

Q: A movie stuntwoman drops from a helicopter that is 30.0

A movie stuntwoman drops from a helicopter that is 30.0 m above the ground and moving with a constant velocity whose components are 10.0 m/s upward and 15.0 m/s horizontal and toward the south. Ignore...

Q: Recall that density is mass divided by volume, and consult Appendix

Recall that density is mass divided by volume, and consult Appendix B as needed. (a) Calculate the average density of the earth in g/cm3, assuming our planet is a perfect sphere. (b) In about 5 billio...

Q: An acre has a length of one furlong (1/8

An acre has a length of one furlong (1/8 mi) and a width one-tenth of its length. (a) How many acres are in a square mile? (b) How many square feet are in an acre? See Appendix E. (c) An acre-foot is...

Q: In January 2006 astronomers reported the discovery of a planet, comparable

In January 2006 astronomers reported the discovery of a planet, comparable in size to the earth, orbiting another star and having a mass about 5.5 times the earth’s mass. It is believed to consist of...

Q: A maser is a laser-type device that produces electromagnetic waves

A maser is a laser-type device that produces electromagnetic waves with frequencies in the microwave and radio-wave bands of the electromagnetic spectrum. You can use the radio waves generated by a hy...