75kg roller skater traveling 15 m/s skids to a stop. If all of the energy is absorbed by his. 5 kg aluminum skates, what is the change in temperature?

A spherical source of sound radiates uniformly into a large volume of air at 25C and 101.3 kPa. The frequency of the sound wave is 274 Hz, and the acoustic power radiated from the source is 30mW.

How can the same material bend in one situation but break in another

If you weigh 690n on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 19.0 km?]

What shape does the moon appear to be when it is closer to the sun

Your class decides to build a circuit to make a light bulb shine. When you are finished, you have a setup with wires, a light bulb and a battery. What role does the battery play in this circuit design? A) The battery works as the system's wires.

The half-life of carbon-14 is 5730 years. How long will it take for the number of carbon-14 nuclei in a sample to drop to a quarter of the original number? Enter your answer as a number years

Which object has more thermal energy a bowl of soup or pot of soup

When you look into a clear pond, a fish may appear to be in a different position than it actually is. What is this caused by? A. diffraction B. dispersion C. refraction D. reflection,

How long would it take to drive to alpha centauri (4.4 light-years away) ?

A type of fault where the hanging wall slides upward