1.6 (2 points) A 100 kg man is of an standing in an elevator that is acceleratin

Question

1.6 (2 points) A 100 kg man is of an standing in an elevator that is accelerating up towards the top floor apartment building. What does the scale read? A 100 kg B. less than 100 kg C. more than 100 kg 1.7 (2 points) what would the scale in this picture read? A. 5000 N B. 1000 N C. 1500 N D, 2000 N E, 2500 N 1.8 (2 points) figure shows waves coming from two sources. What best describes the interference at the black dot A. The interference is maximally constructive. B. The interference is perfectly de- C. The interference is somewhere between perfectly desctructive and maximally constructive. D. You cannot describe the inter- ference as constructive or de- structive because there is beat- ing between teh two waves. 1.9 (2 points) A gun shoots a plastic ball with a launch speed of to. if the spring is spring-loaded compressed twice as far, the balls launch speed will be A. to B. vo/2 D. Ito

Explanation / Answer

1.6 net force upward = m a

N - m g = m a

N = mg + m a

so more than 100 kg

Ans(C)

1.7
balancing moment about hinge point,

(L/2 N) - (L x 1000) = 0

N = 2000 N

Ans(E)

1.8 (B)

both have minimums at the dot location.

1.9 Applying energy conservation,

k x^2 /2 = m v^2 /2

so x is directly prpotional to the v0.

so if x is doubled then v0 will also doubled.

Ans(E)

1.10 Ans(D)
Using the doppler's effect.

1.11 Ans(D)

1.12 a = F / m

and vf = vi + a t

0 = v - a t

t = v / a

t1 = v1 m1 / F = 1 x 2 / F = 2 / F

t2 = v2 m2 / F = 2 x 1 / F = 2 / F

Ans(C)

1.13 moving at constant speed hence there will be only centripetal acceleration that is always towards the center of cirle.

Ans(D)

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