The weight of a body is 12kgf . what is the weight in SI unit ? what is the mass of the body ?

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of