Guitar produces sound waves when a string is plucked and it vibrates. The measure of the number of the string's vibrations in 1 second is called A. speed
B. frequency
C. amplitude
D. wavelength

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.