Describe the energy changes associated with evaporation and boiling?

If the force experienced by a positively charged balloon is 2.7 newtons and the electric field strength is 7.8 * 105 newtons/coulomb, what is the magnitude of the charge on the balloon?

Which statement best describes a characteristic of gases?

What measurement is equivalent to 350 milliliters?

What is the apparent weight of this same object at the neptune's equator? (note that neptune's "surface" is gaseous, not solid, so it is impossible to stand on it.) ?

The 20 g bullet is traveling at 400 m/s when it becomes embedded in the 2 - kg stationary block. Determine the distance the block will slide before it stops. The coefficient of kinetic friction between the block and the plane is μk=0.2.

Janice has just measured the density of an object. Which value is possible? (Density: D = )

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy

When a gas in a container is squeezed to half its volume, its density?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?