Questions from Modern Physics

Q: A brick is dropped (zero initial speed) from the roof

A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 1.90 s. You may ignore air resistance, so the brick is in free fall. (a) How tall, in meters, is th...

Q: A 7500-kg rocket blasts off vertically from the launch pad

A 7500-kg rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.25 m/s2 and feels no appreciable air resistance. When it has reached a height of 525 m, its engines...

Q: In the vertical jump, an athlete starts from a crouch and

In the vertical jump, an athlete starts from a crouch and jumps upward as high as possible. Even the best athletes spend little more than 1.00 s in the air (their “hang time”). Treat the athlete as a...

Q: A student is running at her top speed of 5.0

A student is running at her top speed of 5.0 m/s to catch a bus, which is stopped at the bus stop. When the student is still 40.0 m from the bus, it starts to pull away, moving with a constant acceler...

Q: A ball is thrown straight up from the edge of the roof

A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof 1.00 s later. Ignore air resistance. (a) If the height of the building is 20.0 m, what must...

Q: Can you have zero displacement and nonzero average velocity? Zero displacement

Can you have zero displacement and nonzero average velocity? Zero displacement and nonzero velocity? Illustrate your answers on an x-t graph.

Q: The football team at Enormous State University (ESU) uses vector

The football team at Enormous State University (ESU) uses vector displacements to record its plays, with the origin taken to be the position of the ball before the play starts. In a certain pass play,...

Q: All of the stars of the Big Dipper (part of the

All of the stars of the Big Dipper (part of the constellation Ursa Major) may appear to be the same distance from the earth, but in fact they are very far from each other. Figure P1.91 shows the dista...

Q: Starting from the front door of a ranch house, you walk

Starting from the front door of a ranch house, you walk 60.0 m due east to a windmill, turn around, and then slowly walk 40.0 m west to a bench, where you sit and watch the sunrise. It takes you 28.0...

Q: A car is stopped at a traffic light. It then travels

A car is stopped at a traffic light. It then travels along a straight road such that its distance from the light is given by x(t)= bt2 - ct3, where b = 2.40 m/s2 and c = 0.120 m>s3. (a) Calculate the...