An inclined plane is 100m long and at an angle of 20°to the horizontal the AMA of the slope is two. calculate a.)the effort required to push a7200N block up the slope
b) the ideal mechanical advantage

c) the efficiency of the slope

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

If a rock is thrown upward on the planet mars with a velocity of 10 mys, its height in meters t seconds later is given by y − 10t 2 1.86t 2 . (a) find the average velocity over the given time intervals: (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001] (b) estimate the instantaneous velocity when t − 1.