The first scientist to introduce the concept of inertia was A) Aristotle. B) Gal

Question

The first scientist to introduce the concept of inertia was A) Aristotle. B) Galileo. C) Newton. D) Copernicus. Suppose that, as it evaporates in the upper atmosphere, a raindrop's diameter changes in one minute from one millimeter to one micrometer. Its diameter has decreased by a factor of A) 10, i.e., it is one tenth of the initial size. B) 100, i.e., it is one hundredth of the initial size. C) 1000 (or, 10^3), i.e., it is one thousandth of the initial size. D) 1000000 (or, 10^6), i.e., it is one millionth of the initial size. Sam runs along the aisle of a train that moves at 5 m/s. Her speed relative to the floor is 8 m/s. Her speed relative to an observer at rest on the ground is A) 3 m/s. B) 13 m/s. C) either depending on her running direction. D) none of the above. If a car decreases its velocity from 20 m/s to zero in 5 seconds, its acceleration is A) -5 m/s^2. B) 4 m/s^2. C) -4 m/s^2. D) 100 m/s^2. E) -100 m/s^2. In the process of delivering mail, a postal worker walks 100 m, due east from his truck. He then turns around and walks 70 m, due west from his truck. What is the worker's displacement relative to his truck? A) 30 m, due west B) 30 m, due east C) 170 m, due west D) 170 m, due east In order to find the height of a bridge, you drop a stone into the lake and time its fall. It hits the water after falling for 4 s. Approximate the magnitude of g to be 10 m/s^2. The height of the bridge is about A) 5 m. B) 80 m. C) 40 m. D) 20 m The velocity of an auto increases 5 m/s in every second. The acceleration of the auto in m/s^2 is A) 5. B) 10. C) 20. D) 30. E) zero.

Explanation / Answer

5) worker's dipacement

= 100 + 70 =170 m due wast

7) a = rate of change of velocity

= dv/dt

= 5/1

= 5m/s2

so option A) is the correct answer

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