Based on the law of conservation of energy, which statement is false?
o a
energy is lost when machines don't work right.
b. we can't add more energy to the universe.
oc. we can't destroy energy that exists in the universe.
d.
energy changes from one form to another.

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?