Sound waves cannot travel in

a. steel.

b. air.

c. a vacuum.

d. water. e. sound can travel in all of the above.

Three liquids are at temperatures of 6 ◦C, 23◦C, and 38◦C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 13◦C.

A horizontal force of magnitude 34.0 n pushes a block of mass 3.93 kg across a floor where the coefficient of kinetic friction is 0.565.

A street lamp weighs 150N. It is supported by two wires that form an angle of 120° with each other. The tensions in each wire are equal. What is the tension in each wire?

Thermal energy from the sun travels to earth by?

The least common fossils are those that have been petrified frozen buried distilled

As the average kinetic energy of the particles in a gas increases, which of the following occurs?

Power=170 watts time=20 seconds

What is the charge of alpha, beta and gamma rays?

A pair of scissors is a complex machine. what simple machines make up a pair of scissors?

Methane gas absorbs red light, and methane clouds reflect blue light, giving Uranus and Neptune their distinctive blue colors. Why do Uranus and Neptune have methane clouds, but Jupiter and Saturn do not