For 1, 2, 3, 5 use the kinematic equations:
v = v0 + at
x = x0 + v0t + 1/2 at^2
a(x - x0) = 1/2 (v^2 - v0^2)
Where the subscript 0 represent the initial value of the quantity.
This is for the x direction, but you can use it for y or z direction as well, by simply substituting x with y or z.
For 4,
I guess that you are given the component of the weight perpendicular to the inclined plane.
You should be able to find the weight using trigonometry.
Keep in mind that the angle that the weight makes with the component perpendicular to the plane is the same as the angle the inclined plane makes with the horizontal.
For 6,
You must balance the force of gravity to lift the object. So the force you exert is upward with magnitude mg.
And if you have a constant force that is in the direction of the displacement, the work done by the force is the product between the magnitude of the force and the displacement.
*
Last edited by Roller; Oct 1st 2015 at 07:39 AM.
* |