A disk has a moment of inertia of 3.0 × 10^?4 kg·m2 and rotates with an angular speed of 3.6 rad/s. What net torque must be applied to bring it to rest within 3.6 s?
a. 3.89E–4 N·m b. 3.00E–4 N·m
c. 4.32E–4 N·m d. 3.00E–4 N·m
e. 1.20E–4 N·m
d
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A starburst galaxy gets this name because
A) it contains far more x-ray bursters than our Milky Way Galaxy. B) it has many stars bursting out of its disk toward intergalactic space. C) it is forming stars so fast that the starburst phase of life must be temporary. D) it contains so many stars that the galaxy's gravity cannot retain them in their orbits.
Structure 1 with member BC of length L/2 has force P1 applied at joint C. Structure 2 with member BC of length L has force P2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied forces P1/P2 5 5/2, the ratio of the joint B rotations ?B1/?B2 is approximately:
(A) 1
(B) 5/4
(C) 3/2y
(D) 2
A hunter on level ground fires a bullet at an angle of 10 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
A) the one dropped B) the one fired C) both hit at the same time.
It is possible using the analogies between linear motion and rotational motion to write an expression for rotational kinetic energy. The formula for rotational kinetic energy (assuming ? is torque, ? is angular acceleration, I is rotational inertia, and ? is angular velocity) is
A. ½ I ?2. B. ½ ? ?2. C. ½ ? ?2. D. ½ I ?2.