Questions from College Physics

Q: When the temperature as measured in °C of a radiating object

When the temperature as measured in °C of a radiating object is doubled (such as a change from 20°C to 40°C), is the radiation rate necessarily increased by a factor of 16?

Q: Two factors that can determine the distance over which a force can

Two factors that can determine the distance over which a force can act are the mass of the exchange particle that carries the force and the Heisenberg uncertainty principle [Eq. (28-5)]. Assume that t...

Q: In a circus trapeze act, two acrobats fly through the air

In a circus trapeze act, two acrobats fly through the air and grab on to each other, then together grab a swinging bar. One acrobat, with a mass of 60 kg, is moving at 3.0 m/s at an angle of 10° above...

Q: A cup of hot coffee has been poured, but the coffee

A cup of hot coffee has been poured, but the coffee drinker has a little more work to do at the computer before she picks up the cup. She intends to add some milk to the coffee. To keep the coffee hot...

Q: At t = 0, six birds are flying south at 10

At t = 0, six birds are flying south at 10 m/s. Their masses and their velocities at a later time are: (a) 200 g, 10 m/s north at t = 30 s (b) 200 g, 10 m/s east at t = 30 s (c) 200 g, 20 m/s north at...

Q: A convex mirror produces an image located 18.4 cm behind

A convex mirror produces an image located 18.4 cm behind the mirror when an object is placed 32.0 cm in front of the mirror. What is the focal length of this mirror?

Q: A proposed “space elevator” consists of a cable going all

A proposed “space elevator” consists of a cable going all the way from the ground to a space station in geostationary orbit (always above the same point on Earth’s surface). Elevator “cars” would clim...

Q: Two children are playing with a tin-can telephone. The

Two children are playing with a tin-can telephone. The children are 12 m apart, the string connecting their tin cans has a linear mass density of 1.3 g/m, and it is stretched with a tension of 8.0 N....

Q: A wooden barrel full of water has a flat circular top of

A wooden barrel full of water has a flat circular top of radius 25.0 cm with a small hole in it. A tube of height 8.00 m and inner radius 0.250 cm is suspended above the barrel with its lower end inse...

Q: What makes clothes cling together—or to your body—after

What makes clothes cling together—or to your body—after they’ve been through the dryer? Why do they not cling as much if they are taken out of the dryer while slightly damp? In which case would you ex...