A4.00 kg stone is dropped from a height of 145 m. what is the stone’s potential and kinetic energy respectively when it is 50.0 m from the ground?

a - 1,960 j, 5,680 j

b - 5,680 j, 1,960 j

c - 3,720 j, 1,950 j

d - 1,960 j, 3,720 j

Which device uses ac current to operate?

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.