Will somebody please help mw with these Physics questions.
A ball attached to a string is whirled in a circle. If the string breaks, what causes the ball to move in a straight line?
b. centripetal force
c. centripetal acceleration
d. centrifugal force
A boy can raise a rock that weighs 120 N by using a lever and applying a force of 25 N. What is the mechanical advantage of the lever?
A dog sits 1.25 m from the center of a merry go round and revolves at a tangential speed of 2.0 m/s. If the dog's mass is 19.3 kg, what is the magnitude of the centripetal force on the dog?
a. 40. N
b. 61.8 N
c. 103 N
d. 21.3 N