A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest on Earth,
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket.
B) the light will reach the front of the rocket before it reaches the back of the rocket.
C) the light will reach the front of the rocket after it reaches the back of the rocket.
Answer: C
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Assume that all the circuit elements have the same resistance. (b) Which bulb is (or bulbs are) dimmest? (To indicate a pair of bulbs using the letters at the back of the book, point to two letters at the same time.)
A. Bulb A
B. Bulb B
C. Bulb C
D. All three bulbs are equally bright.
In radioactive dating, carbon-14 is often used. This nucleus emits a single beta particle when it decays. When this happens, the resulting nucleus is
A) still carbon-14. B) boron-14. C) nitrogen-14. D) carbon-15. E) carbon-13.
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards, the velocity points __________ and the acceleration points __________
Fill in the blank(s) with correct word
Torque: A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pivot point produced by this force?
A. 7.6 N ? m B. 10.7 N ? m C. 12.0 N ? m D. 9.7 N ? m