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%

The frequency of the middle d note on a piano is 293.66 hz. what is the wavelength of this note in centimeters? the speed of sound in air is 343.06 m/s.

This is a subatomic particle with a negative charge and very little mass.

List four forms of energy that might be absorbed or released during a chemical reaction

Your friend comes back to school after a week of being sick. She tells you that she wasn't quite able to talk during that time. Which organ was responsible for her inability to emit (release) sounds to talk?

A metal object is suspended from a spring scale. The scale reads 943 N when the object is suspended in air, and 799 N when the object is completely submerged in water. a. Find the volume of the object. The acceleration of gravity is 9.8 m/s².

What is the z coordinate for the above vector? A vector is r⇀ = 356 m @ θ = 115∘, φ=-30.0∘. 178 m -178 m 120 m 308 m

In a classic carnival ride, patrons stand against the wall in a cylindrically shaped room. once the room gets spinning fast enough, the floor drops from the bottom of the room!

What does Newton's law of universal gravitation say about the distance between objects?

Direction of current in a solenoid depends on the direction of magnetic field

What is your mass in kilograms?