Tarzan tries to cross a river by swinging from one bank to the other on a vine t

Question

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 12.2 m long. His speed at the bottom of the swing is 8.8 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 103 N. What is the largest mass that Tarzan can have and still make it safely across the river?
1 . kg. 1/4
When you take your 1200 kg car out for a spin, you go around a corner of radius 45 m with a speed of 18 m/s. Assuming your car doesn't skid, what is the force exerted on it by static friction?
Magnitude
1 .    kN Direction
2
forward
backward
toward the middle of the circle
away from the middle of the circle
up
down

Explanation / Answer

1)

mv^2 / r = Tmax

=> m = 16.22 kg

2)

F = Mg = Mv^2/r

= 8640N

direction : towards the middle of the circle

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