What is the correct method to subtract a vector from another vector?
a. Put one on top of the other, put a minus sign by the lower one, and then subtract as if they were numbers.
b. Draw an arrow from the head of the first vector to the tail of the second.
c. Add the two vectors and make the result negative.
d. Turn the arrow you are subtracting around, and then add.
e. Draw an arrow from the tail of the first vector to the head of the second.
Ans: d. Turn the arrow you are subtracting around, and then add.
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Alex throws a 0.25-kg rubber ball down onto the floor. The ball's speed just before impact is 4.5 m/s, and just after is 2.9 m/s. What is the change in the magnitude of the ball's momentum?
a. 0.39 kg/m/s b. 1.9 kg/m/s c. 1.1 kg/m/s d. 0.73 kg/m/s e. 7.4 kg/m/s
During loading in a stress-strain test of a material, we observe that the plot is not linear and has no discontinuities. We can assume that:
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A sample of water, H2O, has a mass of 38.0 g. How many atoms of oxygen are in the sample? (oxygen has 16.0 g/mol, hydrogen has 1.00 g/mol, and NA = 6.02 × 10^23)
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Suzie Skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on Suzie is then
A) 90 N. B) 250 N. C) 410 N. D) 500 N. E) none of the above