Which substance has the highest density at room temperature?

a. hydrogenc. waterb. oxygend. they are all the same

Two train whistles, A and B, each have a frequency of 392 Hz. A is stationary and B is moving toward the right (away from A) at a speed of 35.0 m/s. A listener is between the two whistles and is moving toward the right with a speed of 15.0 m/s.

What are the three characteristics of sound waves

Three polarizing filters are stacked, with the polarizing axis ofthe second and third filters at angles of 22.2^/circ and 68.0^/circ, respectively, to that of thefirst. If unpolarized light is incident on the stack, the light hasan intensity of 75.

A nuclear reactor is: a. constructed from thick aluminum walls that can control the nuclear reactions b. surrounded by a thick pressure vessel that is filled with a cooling fluid c. powered by a combustion chamber in which uranium is burned d.

According to newton's first law, if a body is moving in the absence of any net external force, decribe the continuing motion of the object

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1) gravity 2) normal force 3) air resistance 4) tension 5) friction

Use Newton's universal law of gravitation to explain why gravity is greater on Earth than on Mercury.

What is a magnetic field and how does it interact with magnetic materials?

What is significant about holden sitting on the radiator?