The equation e = mc2 relates mass and

a. energy

b. force

c. work

d. gravity

Which statement about the effects of medium on the speed of a mechanical wave is true? A. Medium has no effect on the speed of a mechanical wave. B. A mechanical wave generally travels faster in solids than liquids. C.

If the Density of an object is 5.2 g/cm3, and its volume is 3.7 cm3, what is its mass

One of the principal difficulties in establishing the theory of continental drift (the idea that tectonic plates drift around on Earth's surface) was identifying a source of energy capable of powering such movements.

A child pushes a toy car down a hill. After 5 seconds, the car has a kinetic energy of 115 J and a gravitational potential energy of 30 J. What is the car's mechanical energy at that time? A) 3.9 J B) 85 J C) 115 J D) 145 J

The two dry sand samples are examined by changing one parameter. The independent variable, the one that is intentionally manipulated between the two samples, is the (temperature over time, mass of each sample, or type of material used)

A person riding on the roof of a freight train throws a ball forward. (a) If we ignore air drag and relative to the ground, is the ball moving faster or slower when the train is moving than when it is standing still?

Determine which factors will increase the reaction rate and which factors will decrease te reaction rate.

Read the paragraph below from the section "An Object At Rest Has Potential Energy Potential energy is the energy an object rgy is the energy an object has because of its position. It is energy that is waiting to be released.

Briefly describe the history of the metric system as it applies to the meter and how the definition of a meter has changed over time.

Visible light is an example of?