Like we measure heat with a thermometer._ Now, the bottom layer is the
It contains 90% of the air.

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?

Suppose astronomers built a 140-meter telescope. how much greater would its light-collecting area be than that of the 10-meter keck telescope? express your answer using two sign