The input work done on a machine is 9.63 * 103 joules, and the output work is 3.0 * 103 joules. What is the percentage efficiency of the machine?

Why the bicycle stops when the cyclist stops pedaling?

To catch a fast-moving softball with your bare hand, you extend your hand forward just before the catch and then let the ball ride backward with your hand. Doing this reduces the catching force because a. the time of the catch is decreased. b.

What is a matrix and reinforcement in the simplest explanation.

A 500g object falls off a cliff and losers 100 J from its gravitational potential energy store. if the gravitational field strength g=9.8N/kg, how high is the cliff?

What is the direction of the tangential speed when a car is driving around a circular curve? A. toward the center of the curve B. out from the center of the curve C. straight ahead, in the direction the car is moving D.

A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? A) 36 m B) 72 m C) 140 m D) 210 m

Which of the following best explains why an explosive charge in a cannon can cause a cannonball to fly out of the cannon with a high velocity? A. because chemical potential energy can convert to gravitational potential energy B.

Distance divided by time what is velocity

The decay constant of a radioactive nuclide is 4.6 x 10^-3 s^-1. What is the half-life of the nuclide? 2.5 min 2.0 min 1.4 min 3.6 min 3.1 min

A furlong is an old british unit of length equal to 0.125 mi, derived from the length of a furrow in an acre of ploughed land. a fortnight is a unit of time corresponding to two weeks, or 14 days and nights.