Which of the following is an example of acceleration?
a) a twirling ballerina
b) a car on cruise control going 50 m/s east
c) mrs. crisp (my science teacher) sliding on the gym floor at +2.23 m/s
d) a remote control car traveling at a constant rate of 5 m/h

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.