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

A. 4%

B. 25%

C. 75%

D. 400%

Why should you exercise caution when taking a personality test? Some online tests may ask for too much personal information. Personality tests don't define exactly who you are forever. Some personality tests aren't that good. all of the above

In object moving at 30 M/S takes five seconds to come to a stop what is the objects acceleration

Specific heat capacity is the quantity of heat

What does an epidemiologist do? (write it in your own words)

When your car headlights fail you should?

A piano emits frequencies that range from a low of about 28 hertz to a high of about 4200 hz. find the range of wavelength in air attained by this instrument when the speed of sound in air in 342m / s

Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged. B) It gains protons and becomes positively charged. C) The number of positive and negative charges can be the same. D) It has to be a metal.

Define the law of conservation of momentum in one sentence

A shopping cart rolls from x=19.9m to x=5.40m with an average velocity of - 0.418m/s. How much time did it take? (unit=s)

Where does the energy of a nuclear power plant come from?