Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine?

4%

25%

75%

400%

Which of the statements below is correct about waves? A) All waves do not carry energy. B) All waves carry energy without transferring matter. C) All waves carry energy by transferring matter. D) All waves transfer matter.

Cardi respiratory fitness is most likely to improve due to which of the following types of exercise

Rather than run in the school marathon, then decided to run with his brother and his new car. They drove to north from Pinehills to Silverlight covering a distance of 240 km in four hours. On the way, I stop for a traffic light.

In experimental research, it is important to provide precise definitions of both dependent and independent variables. With - definitions, the variables are described -, to make clear exactly what manipulations and - the experiment involves.

Which statement is true about alkali metals? A. Some of them explode when exposed to water. B. They are in group 18 of the periodic table. C. They are not conductors of heat or electricity. D. They are not very reactive.

Explain why glucose is important to a cell

4. How far does a car travel in 90 seconds if it is traveling at a speed of 55 m/s?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?