How much heat is needed to melt 2.5 kg of lead? The latent heat of fusion for lead is 5.85 Kcal/kg. The latent heat of vaporization of lead is 20.8 kcal/kg

Does the total charge change when we charge an object?

Approximately what is the parallax angle of a star that is 20 light-years away?

A 1600-kg car travels at a speed of 12.5m/s what is its kinetic energy

A circuit has one 10.0-ohm resistor. The current flowing through the circuit is 0.15 amps. So, the battery in the circuit is a (blank) - volt battery.

At very close range, which of these forces is stronger than the gravitational force a.) electric only, b.) magnetic only c.) electric and magnetic

If the volume of a container increases, then the pressure will: A. first increase and then decrease. B. increase. C. stay the same. D. decrease.

How does the theory of natural selection explain the diversity of life?

What law states that when matter undergoes a physical or chemical change, no atoms are created or destroyed?

Which statement would be a valid argument in favor of using nuclear power? There are few negative impacts from mining the fuel. Reactors are safe from natural disasters. There are little to no waste products from fission.

How would you convince somebody that the momentum of an isolated system is constant?