Jeremy has a mass of 60 kg. He is standing on a scale in an elevator that is acc

Question

Jeremy has a mass of 60 kg. He is standing on a scale in an elevator that is accelerating downward at 1.7 m/s/s. What is the approximate reading on the scale? ON 400 N 500 N 600 N 700 N 6 of 20 Certain SUV ads claim that their vehicles can climb a slope of 45.What is the minimum coefficient of static friction between the tires and the road for this to be possible? 0.7 0.9 1.0 None of these 7 of 20 A truck is traveling at 30 m/s on a slippery road. The driver slams on the brakes, and the truck start to skid. The coefficient of kinetic friction between the tires and the road is 0.20, How far wil the truck skid before stopping? 230 m 300 m 450 m 24,5 km None of these

Explanation / Answer

1) the reading will be = m(g-a)

= 60*(10-1.7)

= 498 N

so third option is correct

2) mg sin theta = u mg cos theta

u = tan theta

= tan 45 = 1

3) deceleration of the car = ug = 0.2*9.8= 1.96 m/s2

V^2 - u^2 = 2as

0 - 30^2 = 2*(-1.96)*S

S = 229.6 m

so option 1 is the correct answer

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