In which of the following methods of heat transfer is it necessary for the objects to be directly touching one another? a. convection. b. radiation. c. conduction. d. all of these.

Asample of a gaseous substance changes into a liquid

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves