Questions from Modern Physics

Q: At its Ames Research Center, NASA uses its large “20

At its Ames Research Center, NASA uses its large “20-G” centrifuge to test the effects of very large accelerations (“hyper gravity”) on test pilots and astronauts. In this device, an arm 8.84 m long r...

Q: A web page designer creates an animation in which a dot on

A web page designer creates an animation in which a dot on a computer screen has position (a) Find the magnitude and direction of the dot’s average velocity between t = 0 and t = 2.0...

Q: A railroad flatcar is traveling to the right at a speed of

A railroad flatcar is traveling to the right at a speed of 13.0 m>s relative to an observer standing on the ground. Someone is riding a motor scooter on the flatcar (Fig. E3.30). What is the veloci...

Q: Can you find two vectors with different lengths that have a vector

Can you find two vectors with different lengths that have a vector sum of zero? What length restrictions are required for three vectors to have a vector sum of zero? Explain.

Q: A “moving sidewalk” in an airport terminal moves at 1

A “moving sidewalk” in an airport terminal moves at 1.0 m>s and is 35.0 m long. If a woman steps on at one end and walks at 1.5 m/s relative to the moving sidewalk, how much time does it take her to r...

Q: Two piers, A and B, are located on a river

Two piers, A and B, are located on a river; B is 1500 m downstream from A (Fig. E3.32). Two friends must make round trips from pier A to pier B and return. One rows a boat at a constant speed of 4.00...

Q: A canoe has a velocity of 0.40 m/s

A canoe has a velocity of 0.40 m/s southeast relative to the earth. The canoe is on a river that is flowing 0.50 m/s east relative to the earth. Find the velocity (magnitude and direction) of the cano...

Q: The nose of an ultra-light plane is pointed due south

The nose of an ultra-light plane is pointed due south, and its airspeed indicator shows 35 m/s. The plane is in a 10-m/s wind blowing toward the southwest relative to the earth. (a) In a vector additi...

Q: A river flows due south with a speed of 2.0

A river flows due south with a speed of 2.0 m/s. You steer a motorboat across the river; your velocity relative to the water is 4.2 m/s due east. The river is 500 m wide. (a) What is your velocity (ma...

Q: (a) In which direction should the motorboat in Exercise 3

(a) In which direction should the motorboat in Exercise 3.35 head to reach a point on the opposite bank directly east from your starting point? (The boat’s speed relative to the water remains 4.2 m/s....