Use the words at the bottom to describe a convection current: Energy, dense, less dense, heat, cool

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

1700 j of energy is lost from 0.14 kg object , the temperature decreases from 50°c to 45°c what is the specific heat of this object, amd what is the material ?

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2 . how much is the spring compressed x from its natural length?