24. You and two friends apply a force of 425 N to push a piano up a 2.0 m long ramp.
a. Work How much work, in joules, has been
done when you reach the top of the ramp?
b. Power If you make it to the top in 5.0 s,
what is your power output in watts?
c. Mechanical Advantage If lifting the piano
straight up requires 1,700 N of force, what is
the mechanical advantage of the ramp?

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.

A6.0-μf air-filled capacitor is connected across a 100-v voltage source. after the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). how much additional charge flows from the voltage source, which remained connected during the process?

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves