Add the following lengths, each obtained from a different measuring instrument, and round the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m
What will be an ideal response?
28.41 m
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A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is then
A) 300 N downward. B) 500 N downward. C) 800 N downward. D) 300 N upward. E) 500 N upward.
In which eon of Earth's history did dinosaurs and mammals first appear?
A) Hadean B) Archean C) Phanerozoic D) Proterozoic
What is the difference between 103.5 and 102.24 expressed to the correct number of significant figures?
A) 1.3 B) 1.26 C) 1.260 D) 1.2600
Poke a pinhole in a piece of card and hold it in sunlight and an image of the Sun is cast on the floor. The Sun-image diameter depends on the height of the pinhole above the floor
Measurements for all heights show the Sun-image diameter is about 1/100 the distance between the pinhole and the floor. This means that A) about 100 end-to-end Sun images would fit between the pinhole and the floor. B) distance-wise, the Sun is about 100 Suns away from Earth. C) both of these D) none of the above