What has to happen for a force to do work on an object?

Name one situation in which gravitational potential energy might be useful and one where it might be dangerous

You kick a soccer ball of mass 0.41 kg. the ball leaves your foot with an initial speed of 23 m/s. (a what is the magnitude of the impulse imparted to the ball by you?

Pure water has a hydrogen ion concentration of 1 x 10 (-7) M and a ph of 7. A student measures a basic solution and finds that it has a hydrogen ion (H+) concentration of 1 x 10 (-3).

A very long, straight wire has charge per unit length 3.50*10^-10 C/m. At what distance from the wire is the electricfield magnitude equal to 2.90 N/C?

Cardiac muscle causes movement in the A: Bone B: Tendon C: Ligament D: Organ

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?