A dam produces 400 watts of electrical energy. What is the efficiency of the dam?

The difference between a noise and a musical note is that the noise is. A louder B. of higher pitch C. louder and venally lower pitch D. of irregular pitch

wich following is not use of doppler effect? a, radar b, astronomy c, energy transmission d, blood floe measurment

Find the solution set of x + y = 5, 2 x - y = 7

Jim is playing with a 1-meter-long pendulum that is hooked 2 meters above the ground. He lifts the pendulum's bob to a height of 2 meters above the ground and then releases it. Potential energy is assigned zero value at the ground level.

A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter.

Work is a product of A force and distance B force and heat energy C cause and heat energy D cause and effect

An exploration submarine should be able to descend 1200 m down in the ocean. If the ocean density is 1020 kg/m3, what is the maximum pressure on the submarine hull?

Why cooking pans don't have have metal handles?

Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band

How would you explain photosynthesis to a new student in class