physics forces

[sweetsaja]

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what is the min radius that a cyclist can ride without slipping. v=10km/hr coefficient of friction=.5 for some reason i keep getting ~2 and the answer is 4?

1kg ball is swung around in a 90 cm circle in an angle of 10 below the horizontal. What is the tension in the string? where does teh 10 degrees come into play?

 

[ltw902]

For the second one, think of the person swinging the thing above her head so that the the ball/string is going around like a helicopter, but the string/ball is dipped 10 degrees toward the ground.

To answer the question, there are two forces acting. The tension of the string will be F(T)sin(10). The second force will be gravity so F=mg. Make these two equal to each other...

F(T)sin(10)=mg
F(T)=mg/sin(10)
F(T)=57.6N

I think that's right....

 

[sweetsaja]

oohhhh! i see! thanks!