What will be the frequency of an alternating current if its direction changes after every 0.01 sec

How do you find input energy with only the efficiency and output energy given?

A steam power plant produces 500 MW of electricity with an overall thermal efficiency of 35%. Determine (a) the rate at which heat is supplied to the boiler and (b) the waste heat that is rejected by the plant.

Instead, suppose that it was fired upward at 60◦ with respect to a horizontal line. Then its horizontal component of velocity is 50 m/s. What would be the speed of the projectile at the top of its trajectory?

Air is compressed adiabatically in a piston-cylinder assembly from 1 bar, 300 K to 10 bar, 600 K. The air can be modeled as an ideal gas and kinetic and potential energy effects are negligible.

Which of the following are spread through the vector route of transmission? a. plasmodium b. norovirus c. cholera d. plague e. yellow fever f. typhus g. chickenpox?

Question 11 1 pts Nuclear power plants rely on to generate power. O climate change O fusion Ofission O coal

Which of the following is not a characteristic that geologists use to identify minerals? A. Softness B. Color C. Streak D. Fracture

To practice Tactics Box 10.1 Calculating the work done by a constant force. To find the work done on an object by a force, begin with a visual overview and follow Tactics Box 10.1.

the color of the sun appears to be orange or yellow when looking from the earth but it really is red. true or false

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? 1 - positive 2 - negative 3 - zore