What is the frequency of a wave if its period is 0.25 seconds?

A machine is supplied energy at a rate of 4000 watts and does useful work at a rate of 3761 watts what is the efficiency of the machine

When you exert a force on a fluid in a closed container, does the pressure increase, decrease, or remain constant?

The temp of equal masses of three different liquids A, BandC are 12°C, 19°Cand 28°Crespectively. The temp when A and B are mixed is 16°C, and when Band C are mixed is 23°C. The temp when A and C are mixed is

How do you calculate error in refractive index (n) ?

Deserts are located in latitude zones which are classified as

A body with v=20m/s changes its speed to 28m/s in 2sec. its acceleration will be

Charge: A piece of plastic has a net charge of + 2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 * 10-19 C)

How much heat is needed to raise the temperature of 6g of water by 18oC?

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.