The mass of a lump of gold is constant everywhere but its weight isnt explain both in weight and mass

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?