The graph to the right shows measured values for the magnitude of the restoring

Question

The graph to the right shows measured values for the magnitude of the restoring (elastic) force as a function of the compression of a pinball-machine spring. What is the value of the spring stiffness, k? (A) 2.50 N/m (B) 0.40 N/m (C) 25.0 N/m (D) 40.0 N/m (E) 0.00 N/m According to Newton's second Law, the acceleration imparted to an object is tripled if (A) the net force is doubled. (B) the net force is quadrupled. (C) the net force is tripled. (D) the net force stays the same. (E) the net force decreases six times. According to Newton's Second Law, under the action of a constant force, the acceleration imparted to an object is doubled if (A) the mass is doubled. (B) the mass is halved. (C) the mass is quadrupled. (D) the mass stays the same. (E) none of the above. With one exception, each of the following units can be used to express mass. What is the exception? (A) slug (B) N s^2/m (C) gram (D) newton (E) milligram

Explanation / Answer

1) Using relation

F = kx

k = F/x = slope of the graph

(1-0)/(0.4-0) = 2.5 N/m

2) Net force is tripled

3) mass is halved

4) Newton

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