When are objects in thermal equilibrium? * When they're the same size.
When they're touching.
When they're the same temperature.
When both objects' temperatures have changed by the same amount.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero