Four students were loading boxes of food collected during a food drive. The force that each student exerted while lifting and the distance each box was lifted are listed in the table.

A pulley system is used to lift a crate weighing 150 newtons straight up. If the force applied is 87 newtons and the ideal mechanical advantage of the pulley system is 2, what is the percentage efficiency of the pulley system?

What is the energy stored in the 10.5 μ F 10.5 μF capacitor of a heart defibrillator charged to 8250 V?

What is the velocity of a wave having a frequency of 25 Hz and a wavelength of 10m

A friend claims that there are just two forms of energy: kinetic energy and gravitational potential energy. What is wrong with your friend's statement? A. There are only three types of energy. B. There is only one type of energy. C.

What instrument uses a magnetic field to magnify imags up to 100000000?

Sound waves are mechanical waves in which the particles in the medium vibrate ina direction parrallel to the direction of energy transport. What is another name of the type of wave that transfers energy in this way?

A sound from a source has an intensity of 270 db when it is 1 m from the source. what is the intensity of the sound when it is 3 m from the source?

What experimental term is it when a ruler is dropped to the floor?

Where is most of the energy from incoming waves focused? A. spit B. headland C. underwater D. barrier beach

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.