Which of the following is a reversible physical change?

a. burning coal

b. boiling water

c. chopping onions

d. bread rising in an oven

In a game of pool why will the balls eventually stop after a collision

What is the G. P. E of 675 newtons on 26000 meter mountain

You have a magnet that you can turn on and off with a switch. What type of magnetism are you using? A. Induced magnetism B. Electromagnetism C. Contact magnetism D. Permanent magnetism

What was the vertical component of her acceleration during push-off? the positive direction is upward?

American football is played on a 100 yd100 yd long field, excluding the end zones. What is the length? L of the field in meters? Assume that 1 m equals 3.281 ft. 3.281 ft.

The slope of a velocity time graph over any interval of time gives the during that interval

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit