What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?

a canary sits 10 m from the edge of a 30-m-long clothesline, and a grackle sits 5 m from the other end. The rope is pulled by two poles that each exerts a 200-N force on it. The mass per unit length is 0.10 kg/m.

Is the following statement true or false? Nuclear fission occurs naturally in stars.

Two balloons having the same charge of 1.2 * 10-6 coulombs each are kept 5.0 * 10-1 meters apart. What is the magnitude of the repulsive force between them? (k = 9.0 * 109 newton·meter2/coulombs2) 1.2 * 10-2 newtons 3.2 * 10-3 newtons 6.

A certain aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is a constant 445,000 N, what is the speed of the airplane 10.0 s later?

If a car travels 500 m in 25 second how fast is it traveling?

A football travels 25 m in 2.5 seconds. What is the speed of the football?

A 25 kg ball is thrown into the air when thrown it's going 10 m/s calculate how high it travels

As part of a circus performance, a man is attempting to throw a dart into an apple which is dropped from an overhead platform. Upon release of the apple, the man has a reflex delay of 215 milliseconds before throwing the dart.

A train travels 90 kilometers in 1 hour, and then 82 kilometers in 5 hours. What is it's average speed?

3. A hydraulic lift is used to jack a 950-kg car 45 cm off the floor. The diameter of the output piston is 23 cm, and the input force is 375 N. a. What is the area of the input piston? (10pts) b.