The primary purpose of a particle accelerator is to
A) make small particles go very fast.
B) make small particles achieve large accelerations.
C) create particles and study their behavior.
D) produce energy for commercial use.
E) test new ideas about the law of gravity.
C
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A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
A. ?0.64 kJ B. ?0.40 kJ C. ?0.52 kJ D. ?0.28 kJ E. ?0.76 kJ
A deep space probe moving forward in space needs to make a course correction and so fires a thruster on the side of the probe 90° away from its direction of motion, as shown below. This thruster, while on, exerts a constant force on the probe perpendicular to its original direction of motion. While the thruster is operating, which trajectory best describes the probe’s motion? (Hint: Note that the thrust force delivers an upward impulse to the probe during every successive time interval. Consider what happens to the ball in figure C2.4 as it receives analogous continual downward impulses.)
A. A
B. B
C. C
D. D
E. E
Superconductivity is lost when a certain critical temperature is exceeded
Indicate whether the statement is true or false
A good heat conductor is
A) a poor insulator. B) a good insulator. C) neither of these