Questions from Modern Physics

Q: Suppose the 2.0-kg model car in Exercise 6

Suppose the 2.0-kg model car in Exercise 6.43 is initially at rest at x = 0 and

Q: At a waterpark, sleds with riders are sent along a slippery

At a waterpark, sleds with riders are sent along a slippery, horizontal surface by the release of a large compressed spring. The spring, with force constant k = 40.0 N/cm and negligible mass, rests on...

Q: (a) Suppose you cut a massless ideal spring in half

(a) Suppose you cut a massless ideal spring in half. If the full spring had a force constant k, what is the force constant of each half, in terms of k? (b) If you cut the spring into three equal segme...

Q: A small glider is placed against a compressed spring at the bottom

A small glider is placed against a compressed spring at the bottom of an air track that slopes upward at an angle of 40.0° above the horizontal. The glider has mass 0.0900 kg. The spring has k = 640 N...

Q: An ingenious bricklayer builds a device for shooting bricks up to the

An ingenious bricklayer builds a device for shooting bricks up to the top of the wall where he is working. He places a brick on a vertical compressed spring with force constant k = 450 N/m and negligi...

Q: A force in the +x-direction with magnitude F(

A force in the +x-direction with magnitude F(x)= 18.0 N –(0.530 N/m)x is applied to a 6.00-kg box that is sitting on the horizontal, frictionless surface of a frozen lake. F(x) is the only horizontal...

Q: A 75.0-kg painter climbs a ladder that is

A 75.0-kg painter climbs a ladder that is 2.75 m long and leans against a vertical wall. The ladder makes a 30.0° angle with the wall. (a) How much work does gravity do on the painter? (b) Does the an...

Q: A crate on a motorized cart starts from rest and moves with

A crate on a motorized cart starts from rest and moves with a constant eastward acceleration of a = 2.80 m/s2. A worker assists the cart by pushing on the crate with a force that is eastward and has m...

Q: How many joules of energy does a 100-watt light bulb

How many joules of energy does a 100-watt light bulb use per hour? How fast would a 70-kg person have to run to have that amount of kinetic energy?

Q: It is 5.0 km from your home to the physics

It is 5.0 km from your home to the physics lab. As part of your physical fitness program, you could run that distance at 10 km/h (which uses up energy at the rate of 700 W), or you could walk it leisu...