A flow of electricity that constantly reverses direction. In the United States it reverses itself 120 times per second.

The sun emits energy by converting hydrogen into helium. what is this process called?

Sue ARVA has a moon rock and a mars rock. Both are the exact same size. Sue pours honey into a large glass. The moon rock barely floats on the surface but the mars rock sinks. Which rock has higher density?

You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 1515 lb and was traveling eastward. Car B weighs 1125 1125 lb and was traveling westward at 44.0 44.0 mph.

How does the frequency of a wave when the period of the wave is doubled?

What do we call the quantity of matter that an object contains? A. mass B. weight C. volume D. density

Which of the following could be used to send an receive electromagnetic waves at the same time?

Tim is riding a bike at a velocity of 10m/s north. As he starts to climb a hill, his velocity decreases to 5 m/s north. Is the acceleration positive or negative? Calculate the acceleration.

What is the theme of the car we had to push?

State the law of conservation of energy in your own words

A condition associated with most warm fronts is