17. At what minimum speed must a roller coaster be traveling when upside down at

Question

17. At what minimum speed must a roller coaster be traveling when upside down at the top of a circle (Fig. 5-34) if the passengers are not to fall out? Assume a radius of curvature of 10.0 m
____ meters per second

18. How much tension must a rope withstand if it is used to accelerate a 1200 kg car vertically upward at 0.80 m/s2?
____Newtons

19. A force of 28.0 N is required to start a 3.4 kg box moving across a horizontal concrete floor.
(a) What is the coefficient of static friction between the box and the floor?
(b) If the 28.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction?

20. A person lifts a 5.0 kg cement block a vertical distance 1.0 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process.
_____Joules by person
_____Joules by force of gravity

Explanation / Answer

1.v^2 =rg v= 9.9m/s 2.T= ma +mg = 12732N 3.a.u= F/mg= .84 b. u= 26.3/mg =.79 4.work done by person = mgh= 49.05j done by gravity = -49.05j

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