Aball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance?

How do you know how many valence electrons an atom has?

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?