An echo is an example of sound wave A) diffraction. B) interference. C) reflection. D) refraction.

45 m = how many cm?

Ways to accelerate an object

Law of conservation of mass "When you burn a log in the fireplace, the resulting ashes hae a mass less than that of the original log. Account for the difference in mass."

A block is launched up an incline plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3.

A stopped car reaches 60 meters per second in 12 seconds. What is the acceleration?

Why is it important to develop alternative energy sources

Which of the following subatomic particles does not have a charge? A.) electron B.) proton C.) neutron D.) positron

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa