Question

A person stands on a scale inside an elevator at rest and the scale reads 900 N. If the elevator moves upward at a constant speed of 3 m/s, what does the scale read then?

What if the elevator accelerated upward at a constant rate of 3 m/s², what does the scale read then?

900 N, 2700 N

900 N, 3600 N

900 N, 624.5 N

1175.5 N, 1175.5 N

900 N, 1175.5 N

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Question 282 pts

On a highway curve with a radius of 46 meters, the maximum force of static friction that can act on a 1,200 kg car going around the curve is 7,500 Newtons. What speed limit should be posted for the curve so that cars can negotiate it safely?

[Express the answer in m/s and mph]

17.322 m/s, 38.975 mph

16.956 m/s, 38.151 mph

16.956 m/s, 37.033 mph

16.459 m/s, 37.033 mph

16.956 m/s, 38.975 mph

Answer 1