Why is the efficiency of a machine always less than 100 percent

we discussed a charged particle moving through crossed fields with the forces F_E and F_B in opposition. We found that the particle moves in a straight line (that is, neither force dominates the motion) if its speed is v = E/B.

Two cities, A and B, use the same number of identical wind turbines to generate power. City A has a steady wind speed of 10 knots.

Can the human ear hear radio waves? Give evidence

Also got lost on this question: A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235m below. If the plane is traveling horizontally with a speed of 250 km/h (69.

What two parts make up velocity?

Through which medium would EM waves travel the fastest? A. The Ocean B. The Atmosphere C. Rocks

Average mass of a toy car (small, hot wheels) ?

A cannon directed straight upward launches a ball with an initial speed v. The ball reaches a maximum height h in a time t. Then, the same cannon is used to launch a second ball straight upward at a speed 2v.

Does the sun fuse hydrogen into helium or vice versa?

Is it possible to put a distance versus time graph to be universal go mine