A 125 gram glass mug at 20 oC is filled with 200.0 grams of coffee at 90 oC. The final temperature of the coffee and mug reaches 83oC. Assuming that all heat lost by the coffee is transferred to the mug, what is the specific heat value for the coffee?

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

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.