Conservation of Momentum: In a police ballistics test, a 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block at rest. The bullet goes through the block almost instantaneously and emerges with 50.0% of its original speed. What is the speed of the block just after the bullet emerges?
A. 1.50 m/s
B. 2.97 m/s
C. 3.00 m/s
D. 273 m/s
Answer: A
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Conservation of angular momentum means that a spinning body tends to:
A) fly apart. B) slow down. C) wobble into an eccentric orbit. D) gravitationally collapse. E) keep spinning.
A machinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s
The wheel is run at that angular velocity for 37 s and then power is shut off. The wheel decelerates uniformly at 1.5 rad/s2 until the wheel stops. In this situation, the time interval of angular deceleration (slowing down) is closest to: A) 17 s B) 15 s C) 19 s D) 21 s E) 23 s
The mass of a sulfur atom is 32.0 u, and the mass of a fluorine atom is 19.0 u. What is the mass of a mole of sulfur hexafluoride (SF6)?
a. 41.0 g b. 20.5 g c. 106 g d. 146 g e. 211 g
Which one of the following is an accurate statement about light?
A) When light strikes a surface at the critical angle, all the light passes through the surface. B) When light strikes a surface at the critical angle, only the reflected light is 100% polarized. C) When light strikes a surface at Brewster's angle, it is completely reflected at the surface. D) When light strikes a surface at Brewster's angle, only the reflected light is 100% polarized. E) When light strikes a surface at Brewster's angle, the reflected and transmitted light are both 100% polarized.