Suppose you are asked to find the area of a rectangle that is 2.1cm wide by 5.6cm long. your calculator answer would be 11.76cm^2. now suppose you are asked to enter the answer to two significant figures.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

What you see with your eyes is a form of energy. a. light b. heat c. chemical d. electrical

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