Witch of the following is not an example of work. a) picking up a box off the floor b) raising a barbell over your head c) holding a tray in the cafeteria line d) pushing a box across the floor

If forces acting on an object are unbalanced. true or false

Smallest intensity of a stimulus that you can detect 50 percent of the time is

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)