Questions from Modern Physics

Q: Two 25.0-N weights are suspended at opposite ends

Two 25.0-N weights are suspended at opposite ends of a rope that passes over a light, frictionless pulley. The pulley is attached to a chain from the ceiling. (a) What is the tension in the rope? (b)...

Q: In Fig. E5.10 the weight w is 60.

In Fig. E5.10 the weight w is 60.0 N. (a) What is the tension in the diagonal string? (b) Find the magnitudes of the horizontal forces

Q: An astronaut is inside a 2.25 × 106 kg rocket

An astronaut is inside a 2.25 × 106 kg rocket that is blasting off vertically from the launch pad. You want this rocket to reach the speed of sound 1331 m/s2 as quickly as possible, but astronauts are...

Q: A rocket of initial mass 125 kg (including all the contents

A rocket of initial mass 125 kg (including all the contents) has an engine that produces a constant vertical force (the thrust) of 1720 N. Inside this rocket, a 15.5-N electrical power supply rests on...

Q: On September 8, 2004, the Genesis spacecraft crashed in the

On September 8, 2004, the Genesis spacecraft crashed in the Utah desert because its parachute did not open. The 210-kg capsule hit the ground at 311 km>h and penetrated the soil to a depth of 81.0 cm....

Q: Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal

Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal ropes (Fig. E5.14). The pull is of magnitude 190 N. Find (a) the acceleration of the system and (b) the tensio...

Q: Can the total work done on an object during a displacement be

Can the total work done on an object during a displacement be negative? Explain. If the total work is negative, can its magnitude be larger than the initial kinetic energy of the object? Explain.

Q: A 15.0-kg load of bricks hangs from one

A 15.0-kg load of bricks hangs from one end of a rope that passes over a small, frictionless pulley. A 28.0-kg counterweight is suspended from the other end of the rope (Fig. E5.15). The system is rel...

Q: An 8.00-kg block of ice, released from

An 8.00-kg block of ice, released from rest at the top of a 1.50-m-long frictionless ramp, slides downhill, reaching a speed of 2.50 m>s at the bottom. (a) What is the angle between the ramp and the h...

Q: A light rope is attached to a block with mass 4.

A light rope is attached to a block with mass 4.00 kg that rests on a frictionless, horizontal surface. The horizontal rope passes over a frictionless, massless pulley, and a block with mass m is susp...