What is used to measure motion

The law of universal gravitation applies everywhere for everything applies everywhere but not for everything does not apply everywhere has not been proven

How many neutrons does element X have if it's atomic number is 21 and it's mass number is 75

Explain whether an editorial article in a newspaper, expressing the views of the editor, should be classified as a valid source of information.

Why is the high specific heat of water important to our planet?

What type of general wave requires a medium for the wave to travel through

A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? A) 36 m B) 72 m C) 140 m D) 210 m

Which of the following best explains why an explosive charge in a cannon can cause a cannonball to fly out of the cannon with a high velocity? A. because chemical potential energy can convert to gravitational potential energy B.

Distance divided by time what is velocity

The decay constant of a radioactive nuclide is 4.6 x 10^-3 s^-1. What is the half-life of the nuclide? 2.5 min 2.0 min 1.4 min 3.6 min 3.1 min

A furlong is an old british unit of length equal to 0.125 mi, derived from the length of a furrow in an acre of ploughed land. a fortnight is a unit of time corresponding to two weeks, or 14 days and nights.