Two wires, one copper and the other steel, of equal length stretch the same amount under an applied load P. The moduli of elasticity for each is Es 5 210 GPa and Ec 5 120 GPa. The ratio of the diameter of the copper wire to that of the steel wire is approximately:
(A) 1.00
(B) 1.08
(C) 1.19
(D) 1.32
(D) 1.32
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A ball vibrates back and forth from the free end of an ideal spring having a force constant (spring constant) of 20 N/m
If the amplitude of this motion is 0.30 m, what is the kinetic energy of the ball when it is 0.30 m from its equilibrium position? A) 0.45 J B) 0.90 J C) 0.22 J D) 0.00 J E) 1.4 J
A boy throws a rock with an initial velocity of at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory?
A) 0.110 s B) 0.194 s C) 0.215 s D) 0.303 s
What is a blackbody?
a. a perfect emitter and a perfect absorber of light b. a perfectly opaque object c. a dense object having a temperature above absolute zero d. All of the other choices are correct.
A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining double the kinetic energy received in the above situation?
a. 1.41d b. 1.73d c. 2.00d d. 4.00d