Section l is - Problems Section with three problems to solve where you must show

Question

Section l is - Problems Section with three problems to solve where you must show all your work. Write neatly and legibly, carefully showing each step, or you will receive reduced or no credit. Section II is Multiple-Choice and your answers to these questions must be filled in (A througn E) on the provided scan sheets on side one (the purple side). Use #2 pencil only. 3.0-kg brick rests on a frictionless ramp inclined at 34' above the horizontal. The brick is kept from ting down the plane by an ideal spring that is aligned with the surface and attached to a wall above brick as shown in the figure below. The spring has a spring constant (k) of 120 N/m. By how much the spring stretch (In centimeters) from Its equilibrium state with the brick attached?

Explanation / Answer

Fb = m*g = 3kg * 9.8N/kg = 29.4 N. = Force of the brick.

Fp = 29.4*sin34 = 16.44 N. = Force parallel to the incline.

d = (16.44/120) * 1m = 0.137 m.

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