Ball b, moving in the positive direction of an x axis at speed v, collides with stationary ball a at the origin. a and b have different masses. after the collision, b moves in the negative direction of the y axis at speed v/3. in what direction does a move, as an angle with respect to the x axis?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

Ain is , is 's of ? 0.62 0.79 1.27 1.50

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2