Scientists have learned about the structure of earth's interior by a) examining deep wells b) using radar c) studying seismic waves d) using sonar

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

In science and physics what is the standard unit of measure for speed?

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?