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%

Which is an example of a solution? A) sugar water B) muddy water C) sand and water D) cereal and milk

How do you make a propeller that is strong to make a hovercraft

A what is used to measure air pressure.

Why are newtons second and third law important to everyday life?

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?

In an experiment, all participants receive a treatment but those in the control group recieves a false treatments

When the volume increased, what happened to the density?

8. Chemical weathering occurs more rapidly in what kind of climates? A. Desertlike B. Cold with high snowfall amounts C. Cool and dry D. Warm with abundant rainfall

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be A) zero. B) the same as before.

If an electromagnet is used to pick up nails and other metal objects, what happens when the current is turned off?