A rescue helicopter has a 50 kg load suspended from as rope. If the tension in t

Question

A rescue helicopter has a 50 kg load suspended from as rope. If the tension in the rope is 300 N, is the load ? (circle the correct answer below) An engineer is asked to design a playground slide so that the speed a child reaches at the bottom does not exceed 6.0 m/s. Determine the maximum height that the slide can possibly have. Three identical blocks are sitting on a turntable. The turntable is spinning with an angular speed of 2.30 rad/s. Which block requires the greatest force to keep it from slipping off the turntable? (a) Block A (b) Block B (c) Work C (d) All three the same force A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg.m^2. If the skater's arms are pulled in so the moment of inertia decreases to 1.80 kg.m^2, what is the final angular speed? Assume the net external torque on the skater is 0.

Explanation / Answer

13. Weight of load = mg = 50 x 9.81 = 490.5 N

and T < W

that means W - T = ma

so acclerating downwrds.

14. mgh = mv^2 /2

9.81 x h = 6^2 /2 =

h = 1.83 m

15. F = ma_c = m w^2 r

Greater the r and greater the force

Ans. Block A

16) Using angular momentum,
I1w1 = I2w2

2.25 x 5 = 1.80 x w2

w2 = 6.25 rad/s

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