Why are machines not a 100% efficient?

You throw a ball into a box and close the lid. You hear the ball bouncing around inside as the ball's energy changes from gravitational potential energy to kinetic energy, to elastic potential energy, and so on.

How does an inclined plane work? A A small input force is exerted over a long distance. B A large output force is exerted over a long distance. C The input force is exerted in the direction opposite to the output force.

A 5.0 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.0 m/s2, find the tension exerted by the rope. A. 5.0 x 9.8 NB. (5.0 x 9.8) - (5.0 x 3.0) NC. 5.0 ND. (5.0 x 9.8) + (5.0 x 3.0) N

What would you do to cause two balloons to attract one another and stick together?

Which expression can be used to calculate centripetal acceleration?

Which nitrogen base sequence is the partner of C-A-T-C-G-A? O C-A-T-C-G-A O G-T-A-G-C-T OT-G-C-T-A-G O G-C-A-T-G-T TI

What is the kind of energy that comes from movement?

The average kinetic energy of 1 mole of a gas at 273 degrees Celsius is: 6.81 x 103 J 3.40 x 103 J 1.51 x 103 J 6.72 x 101 J

Which one of the following crystal structures has the fewest slip directions and therefore the metals with this structure are generally more difficult to deform at room temperature? a. BCC b. FCC c. HCP d. BCT

To rid the body of wastes, including excess water and salts" is the purpose of what human body system? A) Digestive B) Excretory C) Skeletal D) Nervous