A55.0-gram lead bullet hits a steel plate, both initially at 24 °c. the bullet melts and splatters on impact. assuming that the bullet receives 72% of its kinetic energy as heat energy, at what minimum speed must it be traveling to melt on impact? (the melting temperature of lead is 327°c)

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

What was the first instrument to ever record an earthquake?

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.