47. Which combination of funda be used to express the elastic potential energy stored in a compressed spring? (1) kg.m/s? (2) kg.m?/s (3) kg. m?/s? (4) kg.m²/s³ 48. A force is applied to a spring causing it to stretch. If the applied force is halved, the potential energy stored in the spring will be (1) halved (2) doubled (3) quartered (4) quadrupled 49. A vertically hung 0.50-meter-long spring is stretched from its equilibrium position to a length of 1.00 meter by a weight attached to the spring. If 15 joules of elastic potential energy are stored in the spring, what is the value of the spring constant? (1) 30. N/m (2) 60. N/m (3) 120 N/m

47. Which combination of funda be used to express the elastic potential energy stored in a compressed spring? (1) kg.m/s? (2) kg.m?/s (3) kg. m?/s? (4) kg.m²/s³ 48. A force is applied to a spring causing it to stretch. If the applied force is halved, the potential energy stored in the spring will be (1) halved (2) doubled (3) quartered (4) quadrupled 49. A vertically hung 0.50-meter-long spring is stretched from its equilibrium position to a length of 1.00 meter by a weight attached to the spring. If 15 joules of elastic potential energy are stored in the spring, what is the value of the spring constant? (1) 30. N/m (2) 60. N/m (3) 120 N/m

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter6: Energy Of A System

Section: Chapter Questions

Problem 11P

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Concept explainers

Spring Potential Energy

The potential energy is the energy possessed by a body by virtue of its position or the energy held by the object due to its position relative to other objects, its force like stresses, charge, and other factors affecting the particles of the body. The potential energy is the measure of the net work done by or on the body. The spring potential energy is the potential energy stored due to the deformation of an elastic spring and this elasticity is due to the stretched spring. The elasticity is the ability of a solid-state matter to come back to its equilibrium position or original position after any kind of external force is acted on it. It is also known as Elastic potential energy. The potential energy here is caused due to the displacement of the spring from its equilibrium position to another position and this potential energy is equal to the net work done due to the stretching of the spring. It also resembles the same mechanics of the oscillation of a simple pendulum, where due to the external force, the object moves from its equilibrium position to its maximum ends and the periodic motion continues till it comes back to the equilibrium position to rest. 

Question

please help with these three questions, 47,48,49

47. Which combination of fundamental units can
be used to express the elastic potential energy
stored in a compressed spring?
(1) kg.m/s?
(2) kg.m?/s
(3) kg. m?/s?
(4) kg.m?/s
48. A force is applied to a spring causing it to
stretch. If the applied force is halved, the
potential energy stored in the spring will be
(1) halved
(2) doubled
(3) quartered
(4) quadrupled
49. A vertically hung 0.50-meter-long spring is
stretched from its equilibrium position to a
length of 1.00 meter by a weight attached
to the spring. If 15 joules of elastic potential
energy are stored in the spring, what is the
value of the spring constant?
(1) 30. N/m
(2) 60. N/m
(3) 120 N/m
(4) 240 N/m

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