a 3.5 kg of aluminum increases its temperature 7 c when heat energy us added. how much heat energy produced this change in temperature? 990 j/kg C

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation:

b.a device that inputs heat into a cool object

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.