Questions from Modern Physics

Q: A wooden block with mass 1.50 kg is placed against

A wooden block with mass 1.50 kg is placed against a compressed spring at the bottom of an incline of slope 30.0° (point A). When the spring is released, it projects the block up the incline. At point...

Q: A small object with mass m = 0.0900 kg moves

A small object with mass m = 0.0900 kg moves along the +x-axis. The only force on the object is a conservative force that has the potential-energy function U(x)= -ax2 + bx3, where a = 2.00 J/m2 and b...

Q: A cutting tool under microprocessor control has several forces acting on it

A cutting tool under microprocessor control has several forces acting on it. One force is

Q: A particle moves along the x-axis while acted on by

A particle moves along the x-axis while acted on by a single conservative force parallel to the x-axis. The force corresponds to the potential-energy function graphed in Fig. P7.76. The particle is re...

Q: You are designing a pendulum for a science museum. The pendulum

You are designing a pendulum for a science museum. The pendulum is made by attaching a brass sphere with mass m to the lower end of a long, light metal wire of (unknown) length L. A device near the to...

Q: A long ramp made of cast iron is sloped at a constant

A long ramp made of cast iron is sloped at a constant angle u = 52.0o above the horizontal. Small blocks, each with mass 0.42 kg but made of different materials, are released from rest at a vertical h...

Q: A single conservative force F1x2 acts on a small sphere of mass

A single conservative force F1x2 acts on a small sphere of mass m while the sphere moves along the x-axis. You release the sphere from rest at x = -1.50 m. As the sphere moves, you measure its velocit...

Q: A 0.100-kg stone rests on a frictionless,

A 0.100-kg stone rests on a frictionless, horizontal surface. A bullet of mass 6.00 g, traveling horizontally at 350 m>s, strikes the stone and rebounds horizontally at right angles to its original di...

Q: A movie stuntman (mass 80.0 kg) stands on

A movie stuntman (mass 80.0 kg) stands on a window ledge 5.0 m above the floor (Fig. P8.81). Grabbing a rope attached to a chandelier, he swings down to grapple with the movie’s villain (mass 70.0 kg)...

Q: A 75-kg roofer climbs a vertical 7.0-

A 75-kg roofer climbs a vertical 7.0-m ladder to the flat roof of a house. He then walks 12 m on the roof, climbs down another vertical 7.0-m ladder, and finally walks on the ground back to his starti...