What must differ between the atom of 2 different elements? protons in the atom electrons in the atom neutrons in the atom protons and neutrons in the nucleus

Q. A body weighs 50 N in air and when immersed in water it weighs only 40 N. Find its relative density.

How long does it take the statue to reach the ground?

A scientific law seeks to explain why an event occurred. True or false

Prove that the volume of a cube that moves with a velocity vin the parallel direction to one of the edges is: , being V0 the volume of the cubemeasured from a reference frame in which the cube doesn'tmove.

A rope vibrates every 0.5 sWhat is the frequency of the waves?

Skeletal muscle cells have large stores of ATP that are readily available and alone can provide energy for maximal exercise lasting 30-60 seconds.

A catcher "gives" with a baseball when catching it. If the baseball exerts a force of 475 N on the glove such that the glove is displaced 8.97 cm, how much work is done by the ball? Answer in units of J.

Which of the following is the best sign that cooking pancake batter causes a chemical change

The electric field near the earth's surface has magnitude of about 150n/c. what is the acceleration experienced by an electron near the surface of the earth? express your answer to two significant figures and include the appropriate units.

Minerals are considered to be Answer made out of rocks the building blocks of rocks extremely rare and valuable difficult to find