What is Newton's 3rd law of motion? A. When objects collide they exert a force to balance both out
B. For every action there is no reaction
C. If an object exerts a force on a second object the second exerts an equal force in the opposite direction
D. Force is applied when there are two opposite objects

Which instrument is used to measure air temperature

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m. the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

In the 1980's, congress authorized the u. s. department of energy to build the wipp facility in the chicuahuan desert in new mexico. what is the purpose of wipp?