Real world efficiency are generally very high in the 90 percent range, true or false?

What is an Advantage and Dis Advantage of energy?

You weigh 730 n. what would you weigh if the earth were six times as massive as it is and its radius were three times its present value? answer in units of n.

In bohr's atomic theory when electron moves from one energy level to another energy level more distant from the nucleus energy is emitted right?

Which set of data would be best illustrated with a bar graph? the effect of hours spent exercising on heart rate the number of skyscrapers in 5 different cities an illustration of how the humidity in the air responds to the temperature of the air

The ac generator in a series RCL circuit has an rms voltage of 70.9 V. The values of the resistance, capacitive reactance, and inductive reactance are, respectively, R = 30.0 Ω, XC = 50.0 Ω, and XL = 90.0 Ω. What is the rms current in the circuit?

Consider the following controls in an automobile in motion : gas pedal, brake, steering wheel. what are the controls in this list that cause an acceleration of the car?

What material are oil pipelines made from?

3/129 A 175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. As he clears the bar, his velocity and that of the pole are essentially zero.

A few years ago, Serena Williams dived to hit a tennis ball right after it bounced off the ground. The ball bounced on the ground 10.3 m from the net, and after Serena hit the ball it flew over the 0.

A force of 1.25x103N is required to lift an object that is under the influence of an acceleration due to gravity of 7.86ft/sec2. What is the object's mass in kilograms?