First one I'm not sure what I've done wrong.
A 20kg wagon is pulled along the level ground by a rope inclined at
above the horizontal. A friction force of 30 N opposes the motion. How large is the pulling force if the wagon is moving with an acceleration of
?
Okay - after taking the friction and angle of the rope into account, I end up with:
The answer, however, is
.
Second one: I'm just not sure what to do as I can't picture the question =S
An inclined plane making an angle of
with the horizontal has a pulley at its top. A 30kg block on the plane is connected to a freely hanging 20kg block by means of a cord passing over the pulley. Compute the distance the 20kg block will fall in 2s starting from rest. Neglect friction.
Thanks everyone.