5. (10) A spring with a spring constant of 1400 Nm is stretched 25 from its equi

Question

5. (10) A spring with a spring constant of 1400 Nm is stretched 25 from its equilibrium position. What is the potential energy of the spring? Answer each of the following questions with "T" for true or "F for false. Be sure that your answers are elearly marked. (2 points each) -1. A 2000 kg pick-up truck will always have nnore momentum than a 1200 kg car. 2. The unit of momentum is a watt. .3·The friction force is a nonconservative force. 4·The normal force never does any work. 5. Energy cannot be created or destroyed. For each of the following multiple choice questions, select one best answer (2 points each) . Henry does 150,000 J of work in 250 s while Susie does 150,000J of work in 100 s. Which of the following statements regarding the power is correct? A. The power applied by Henry is less than the power applied by Susie. B. The power applied by Henry is greater than the power applied by Susie. C. The power applied by Henry is the same as the power applied by Susie. D. The information given has no relation to the power applied. 2. A box is given a push so that it has some kinetic energy. It slides some distance across the carpet and comes to a stop. What happened to the energy? A. it was converted to potential energy B. it was converted to thermal energy C. it ceased to exist D. the person who pushed the box reabsorbs the energy as the box slows down.

Explanation / Answer

10.

Potential energy of the spring is given by

U=(1/2)KX2=(1/2)*1400*0.252

U=43.75 J

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1.false since momentum P=mV ,if velocity of 1200 kg is more compared 2000 kg car then 1200 kg car has more momentum

2.False since momentum unit are kg-m/s

3.True

4.True since normal force is perpendicular to the surface

5.true

2.

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