Which sound wave-object interaction is used by animals in echolocation?

Two cars drive on a straight highway. At time t=0, car 1 passes mile marker 0 traveling due east with a speed of 20.0 m/s. At the same time, car 2 is 0.80 km east of mile marker 0 traveling at 26.0 m/s due west.

What substance is represented by chemical formula C60

What did you observe when food coloring was added to the glass that was not in the cake pan?

Describe the spontaneous flow of heat between objects at different temperatures.

How would the absence of gravity affect the formation of planets?

Steam moves into a cylinder of a steam engine at a constant pressure and does 2.34 J of work on a piston. The diameter of the piston is 3.4 cm and the piston travels 4.6cm. What is the pressure of the steam?

Identify each type of simple machine.

A car's speedometer reads 20 m/s after accelerating, from a standing start, for 25s. What was the magnitude of its acceleration?

What happens to the period of a pendulum and the period of a spring as the amplitude of the oscillation increases? Briefly give an explanation for this relationship.

The element that is most abundant in earth is