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Chrome File Edit View History Bookmarks People Window Help If the coefficient of inetic fric x cowww.webas Assignment-Responses/lst?dep-16866416 Assignment Scoring Your last submission is used for your score. 0/1 points 1 P A 2.1 kg purse is dropped from the top of the Leaning Tower of Pisa and falls 5s m before reaching the ground with a of air resistance? 2.074 × N upward 2. O 35 points | Previous Answers Glanooli7 4.P.O7O A 70.0 kg person stands on a scale in an elevator (a) What does the scale read (in kg) when the elevator is at rest? 70 (b) What does it read when the elevator is climbing at a constant speed of 2.0 m/s kg 70 (c) What does it read when the elevator is falling at 2.0 m/s? 70 kg (d) What does it read when the elevator is accelerating upward at 2.0 m/s2 70 (e) What does it read when the elevator is accelerating downward at 2.0 m/s? 84.3 Your Teach Show Ad

Explanation / Answer

1)

V² = Vo² + 2ax

29² = 0 + 2a(55)

841 = 110a

a = 7.65 m/s²

net F = ma

net F = 2.1 kg (7.65m/s²)

net F = 16.06 N

net F = (Fdown - Fair)

16.06 N = (2.1*9.81 N) - Fair

Fair = 4.541 N

2)

d)

the force due to the acceleration is acting downwards, adding to the weight of the person, so they weigh;

70kg + (70*2/10) = 84 Kg (10N of force = 1Kg)

e)

the force due to the acceleration is acting upwards, away from the scales, and so the person weighs less this time

70Kg - (70*2/10) = 56 Kg

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