Awave is traveling through X. What can be known about X?

It is empty space.

It is any medium.

It is a solid

It is a liquid.

Kepler's first law states that planets orbit the Sun in a path called a (n) a. area. b. period. c. ellipse. d. parabola.

Light in air enter crown glass (n = 1.52) at an angle of 35 degrees. What is the refracted angle?

Heat is a transfer of thermal energy from one object to anther because of a difference in?

The human body stores chemical energy from digested food. Some of the chemical energy is converted into mechanical energy when the body moves.

How can you tell the stigma from the stamens in the flowers

What is the energy source that heats a contracting protostar?

What unit is kg divided by m/s^2

If the energy stored in the fully charged battery is used to lift the battery with 100-percent efficiency, what height is attained? Assume that the acceleration due to gravity is 9.8 m/s2m/s2 and is constant with height

How does the mass of an astronaut change when she travels from earth to the moon? how does her weight change?

If an object has a mass of 20 grams and a volume of 40 cm3, what is its density in g/cm3?