Closed textbook and notes. You may use a calculator. 2.5 hour exam. . Draw a cle

Question

Closed textbook and notes. You may use a calculator. 2.5 hour exam. . Draw a clearly labeled diagram for all problems. Print clearly. Work each problem from basic principles. If you use a formula derived Partial credit will be given, so show all your work neatly. Get all answers to three significant figures. Use SI units. in the book write it first in symbols. Use both sides of the paper. Ask for additional sheets if needed. Staple all your pages. Draw a box around your final answers to each problem part Multiple Choice (5 points each. Circle the best choice here) 1) A boxer delivers a blow of 1000 N to a window that breaks the glass. The force that acts on the hand during this event is actually A) less than 1000 N. B) 1000 N. C) more than 1000 N. D) .there is no way to say for sure. scale as shown. The reading on the scale is Short Problems. Answer below (10 points) 2) Two 5-Newton weights are pulling on the spring A) 10 N. B) 5 N. C) O N. 3. A toy train has a mass of 15 kg without the engine. If the locomotive (engine) can pull with a constant force of 75 N, how much distance is required for the train to accelerate to a speed of 4 m/s from rest?

Explanation / Answer

1) 1000 N

2) spring measures the tension so reading on the scale is 5N

3) given m=15 kg

Force F = 75 N

a = F/m = 75/15 = 5 m/s2

from

vf2 = vi2 + 2as

42 = 0+ (2*5*s)

s = 1.6 m

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