Does a material have less mass when it has contracted?

Heat energy on earth escapes into space. which heat transfer?

A gas is collected from a radioactive material; upon inspection, the gas is identified as helium. The presence of the helium indicates the radioactive sample is most likely decaying by: A). alpha B). beta + C). beta - D). gamma

500 kg cannon and is at rest on a horizontal, frictionless surface on a clear and sunny day. When a crazy cool 100 kg clown decided to show how the cannon works they decided to get fired horizontally from the barrel of the cannon and the cannon

A 149 turn 149 turn circular coil of radius 2.15 cm 2.15 cm is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. Over an interval of 0.165 s 0.165 s, the magnetic field strength increases from 50.5 mT 50.5 mT to 95.

How much mass dose a vehicle have if it needs 29000 Newton's of force to accelerate it at a rate of 4m/s

What is the spine also known as

If a man has a mass of 74 kilograms runs 800 meters in 150 seconds, what is his average momentum?

Two lamps one rated 40W at 220 V and the other 60W at 220 V are connected in parallel to the electric supply at 220V.

A 45.0-kg person steps on a scale in an elevator. The scale reads 460 n. What is the magnitude of the acceleration of the elevator?

The entropy of a hot baked potato decreases as it cools. is this a violation of the increase of entropy principle? explain.