Apendulum of length l is suspended from the ceiling of an elevator. when the elevator is at rest the period of the pendulum is t. how would the period of the pendulum change if the supporting chain were to break, putting the elevator into freefall?

Aforce of 240.0 n causes an object to accelerate at 3.2 m/s2. what is the mass of the object?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?