A 6.0-kg object, initially at rest in free space, "explodes" into three segments of equal mass. Two of these segments are observed to be moving with equal speeds of 20 m/s with an angle of 60° between their directions of motion. How much kinetic energy is released in this explosion?
a. 2.4 kJ
b. 2.9 kJ
c. 2.0 kJ
d. 3.4 kJ
e. 1.2 kJ
c
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A cylindrical tank is assembled by welding steel sections in a heli-cal pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The longitudinal strain in the the wall of the tank is approximately:
(A) 1.2 3 1024
(B) 2.4 3 1024
(C) 3.1 3 1024
(D) 4.3 3 1024
The units T•m2/s are equivalent to:
a. V. c. W. b. N/m. d. webers.
Two blocks of different mass are connected by a string. The system is accelerated across a smooth horizontal surface by a force supplied by a rubber band connected to the less massive block. The tension in the connecting string will be
A. the same as the force pulling the leading block. B. greater than the force pulling the leading block. C. less than the force pulling the leading block. D. zero.
An innovative physics professor conducts laboratory exercises in the college swimming pool. Suppose that one exercise was the measurement of the degree of polarization by bouncing laser light off the vertically-oriented transparent polycarbonate side wall of the pool. The laser is shone on the pool wall at an angle of 42 degrees with respect to the vertical, and at that angle the reflected ray is perfectly polarized. What is the index of refraction of the material? It will help to recall that the index of refraction of water is 1.33.
A. 1.11 B. 1.28 C. 1.20 D. 1.48