1. When a star collapses to form a black hole, its mass

a. decreases

b. remains the same

A 2.0-kg block sits at the top of an inclined plane with a length of 4.12 m. If the coefficient of kinetic friction μk is 0.18 between the block and the plane, how long will it take the block to slide down the plane when released?

A small mass m is tied to a string of length L and is whirled in vertical circular motion. The speed of the mass v is such that the ratio of the string tension at the top of the circle to that at the bottom of the circle is FtopT/FbotT = 0.5.

Light incident on a lake surface is partly reflected and partly refracted. How is the reflected ray different from the incident ray?

How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57*10-21 newtons?

A square coil of wire of side 3.95 cm is placed in a uniform magnetic field of magnitude 2.25 T directed into the page as in the figure shown below. The coil has 34.0 turns and a resistance of 0.780 Ω. If the coil is rotated through an angle of 90.

Which of the following is not the name of a space station that was in orbit around Earth?

Relationship between acceleration and free fall

A SI unit used to measure force, equal to less than one-quarter of a pound, is the what

What basic form of energy is present in blowing wind?

A wave with a frequency of 30 Hz has a wavelength of 40.5 m. How fast is the wave traveling?