I have three different homework questions I cannot seem to get My hw is due at 1

Question

I have three different homework questions I cannot seem to get
My hw is due at 12 so if anyone can help that would be helpful

Thank you

1)   For a car moving with speed v, the force of air drag is proportional to v2. If the power output of the car's engine is quadrupled, by what factor does the speed of the car increase?

2)Tarzan

3) A wheel of mass 13 kg is pulled up a step by a horizontal rope as depicted in the figure below. If the height of the step is equal to one-fifth the radius of the wheel,

Explanation / Answer

2.

Using v^2 = 2 gh
At the lowest point
v^2 = 2*9.8 * 1.5 = 29.4(m/s)^2
Tension T = m v^2/ L + mg = {76 * 29.4 / 8} + 76*9.8 = 1024.1 = 1.02 KN
----
-In the second case it will break.
When the string makes an angle ?, h = 1.5

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