Forget. I got it. 240.1 N
Used 1/2 distance for distance of forarm
mg L/2 + mgL = total torque down
torque up is the same. f=torque / distance , f=240.1
Thanks anyway!
This isn't a homework question, but I'm just wondering how the text in the book gets from one formula to the next.
To figure out total kinetic energy of a rotating object:
K translational + K rotational
\frac{1}{2}mv^2+\frac{1}{2}I (\frac{v}{r})^2
Then the book gives an alternate...
7. Below is a diagram of a baseball/forearm system at rest. It is acted on by four different forces: the weight of the forearm, the weight of the baseball, the bicep force, and a force from the upper arm bone (attached at the elbow).
(Use the following values: L = 14 cm, d = 2 cm, M = 3 kg...
7. [Walker2 8.P.026.] Catching a wave, a 75 kg surfer starts with a speed of 1.3 m/s, drops through a height of 2.05 m, and ends with a speed of 8.2 m/s. How much nonconservative work was done on the surfer?
I used delta K + delta U is nonconservative force.
They want kJ instead of J.
I...