What early advance first increased the ability to communicate over long distances?

A professional cyclist rides a bicycle that is 92 percent efficient. For every 100 joules of energy he exerts as input work on the pedals, how many joules of output work are used to move the bicycle?

You are given 6 identical resistors, and allowed to combine them in any possible configuration to produce different equivalent resistances.

A hydrogen fuel cell supplies power for a small motor. the fuel cell delivers a current of 0.5 a and a voltage of 0.43 v. what is the power supplied to the motor by the fuel cell?

Kelly carried a box weighing 10 N the 200 meters from his car to his new house. George took the box from Kelly and carried it up the 3 meter tall flight of stairs. Who did more work?

A plane travels 1000 miles in 5 hours. what is the planes average speed?

A proposed space station includes living quarters in a circular ring 50.0 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth?

Which transformation of energy occurs in a hydroelectric power plant? A. Potential energy to chemical energy B. Chemical energy to potential energy C. Chemical energy to Kinetic energy D. Kinetic energy to electrical energy F.

Which two supreme court cases delt with the first amendment rights of students in public schools

Two boxes sit on a frictionless surface and are in contact with one another. the first box has a mass of 7 kg and the second box has a mass of 8 kg. A 25 N force is applied to the 7 kg box. Find the acceleration of the boxes.

Which pharaoh ordered the use of millions of man hours and extraordinary resources to create the Great Pyramid at Giza? A) Amenhotep B) Khufu C) Menes D) Tutankhamen