Which is a part of a vacuum?

a) inclined plane

b) block and tackle

c) wedge

d) lever

The process in which bone cells gradually replace cartilage is called?

The thumb is the only saddle joint in the human body

What is the Lorentz force law used for?

What type of change had occurred when a nail rusts

You are sitting at the beach and want to determine the speed of a wave. You estimate the wavelength to be 3 m and find the frequency to be 5 Hz. What is the speed of the wave?

Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below).

Is mercury (the planet) rocky or gaseous (meaning relating to or having the characteristics of a gas.)

What does one prolonged blast emitted by boat a using an efficient sound producing device indicate?

Feng and Isaac are riding on a merry-ground. Feng rides on a horse at the outer rim of the circular platform, twice as far from the center of the circular platform as Isaac, who rides on an inner horse.

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. She placed a ray box in front of a mirror.