February 24, 2017

Homework Help: Physics

Posted by Sara on Monday, October 26, 2009 at 1:45pm.

A tire cruises up an embankment at 30° for 1 meter before launching across Piranha Lake. What is the velocity of the tire at the top of the embankment in m/s?

HELP: Inital KE of the tire is 1/2*M*V2 + 1/2*I*(V/R)2; both rotational and translational
Final KE = Initial KE - M*g*h where h = 1m * sin(30°).

Also: Initial Velocity is 2.8m/s Mass=10kg radius=.3m and I calculated the angualr momentum to be 4.2

It seems like the help part spells it all out but I still don't get the right answer.

This is what I tried to do:
KEfinal= 1/2(10)(2.8)^2 + 1/2 (10) (2.8)^2 - (10)(9.8)(1 sin 30)

KEfinal= 29.4
29.4= 1/2mv^2
V= sqr(29.4*2/10)=2.42 but this is not the righ answer...I don't know what I am doing wrong

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