Visible light has a frequency of about 6x10^14 Hz. How long does it take for one complete cycle of visible light to enter our eyes?

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

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?