Which of the following statements is true?

a.) all of the sun's heat is reflected by the earth's atmosphere.
b. )radiation is the transfer of heat between objects which are not touching.
c.) an insulator speeds up the vibration of molecules and the transfer of heat.
d.) heat is transfered in solids through conduction.

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.

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?

How many joules will be lost by 150 g of water if it is cooled from 90oc to 5oc?