Does a radioactive isotope ever lose its radioactivity?
A) yes
B) no
C) sometimes
D) usually
Answer: B
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Uniform Circular Motion: A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force on the car due to the road?
A. tangent to the curve in the forward direction B. tangent to the curve opposite to the direction of the car's motion C. perpendicular to the curve outward D. perpendicular to the curve inward E. There is no friction on the car because its speed is constant.
Voyager 1 was unable to image Titan's surface because
A) of "smog" in Titan's atmosphere. B) volcanic activity spewed sulfur clouds, obscuring the surface. C) of Titan's high reflectivity. D) the cameras were damaged by Saturn's magnetic field. E) the moon was in shadow during the mission.
Which of the following are basic postulates of special relativity? (There could be more than one correct choice.)
A) The speed of light is the same for all observers. B) No material object can be accelerated to the speed of light. C) The laws of physics are the same in all inertial reference frames. D) Nothing can travel faster than the speed of light. E) The laws of physics are the same in all reference frames.
In nickel-based superalloys, aluminum and titanium are added to provide _________-hardening.
Fill in the blank(s) with the appropriate word(s).