Calculate the minimum intensity of light in watts (j/s) required to eject 1.40 x 1011 electrons (each with a kinetic energy of 3.61 x 10-19 j) using a 0.20 second pulse of light.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.