Ablock of mass m is released from rest at a height r above a horizontal surface. the acceleration due to gravity is g. the block slides along the inside of a frictionless circular hoop of radius r. which one of the following expressions gives the speed of the block at the bottom of the hoop?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Boiling water is an example of physical change. true or false

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.