Physics > QUESTIONS & ANSWERS > PROBLEM-SET-4 - Mapúa Institute of Technology PHY 120-0 (All)

PROBLEM-SET-4 - Mapúa Institute of Technology PHY 120-0

Document Content and Description Below

Question 1 Which of the following statements is/are TRUE? I. Strain describes the deformation of an object. II. Stress on an object is directly proportional to the strain even under plastic deformation. III. Bending an object subjects it to compressive and tensile forces. Selected Answer: E. I and III Answers: A. I only B. II only C. III only D. I and II E. I and III  Question 2 A 1.60-m long steel piano wire has a diameter of 0.20 cm. How great is the tension in the wire if it stretches 0.25 cm when tightened? Note: Young’s modulus of steel is 2.0 x 1011 N/m2 . Selected Answer: D. 980 N Answers: A. 245 N B. 490 N C. 784 N D. 980 N E. 1225 N  Question 3 For the next two numbers, consider a family of four with a total mass of 200 kg step into their 1200-kg car, the car spring’s compress 3.0 cm. What is the spring constant of the car’s springs, assuming that they act as a single spring? Selected Answer: B. 6.5 x 104 N/m Answers: A. 5.5 x 104 N/m B. 6.5 x 104 N/m C. 11 x 104 N/m D. 13 x 104 N/m E. 22 x 104 N/m  Question 4 How far will the car lower if loaded with 300 kg rather than 200 kg? Selected Answer: D. 4.5 x 10-2 m Answers: A. 1.5 x 10-2 m B. 2.5 x 10-2 m C. 3.5 x 10-2 m D. 4.5 x 10-2 m E. 5.5 x 10-2 m  Question 5 Which of the following is TRUE about a spring-mass system assuming that the mass is attached to the spring? Selected Answer: D. The potential energy of a body in oscillation is maximum when it is farthest from the equilibrium position. Answers: A. The potential energy of a body in oscillation is minimum when it is farthest from the equilibrium position. B. The restoring force is constant at any position. C. The kinetic energy is minimum at the equilibrium position. D. The potential energy of a body in oscillation is maximum when it is farthest from the equilibrium position. E. The restoring force on a body in oscillation is minimum only when it is farthest from the equilibrium position.  Question 6 A spring-mass system is oscillating with amplitude A and total mechanical energy E. What is its kinetic energy when it is a distance x from its equilibrium position? Hint: Obtain the value of the spring constant k from the total mechanical energy. Selected Answer: B. E x2 /A2 Answers: A. E x/A B. E x2 /A2 C. E A2 /x2 D. E (1 - x 2 ) /A2 E. E (1 - x 2 /A2 )  Question 7 A 0.20-kg object attached to a spring whose spring constant is 500 N/m executes simple harmonic motion. If its maximum speed is 5.0 m/s, theamplitude of its oscillati

[Show More]

Last updated: 3 years ago

Preview 1 out of 13 pages

Buy Now

Instant download