A string is attached to the rear-view mirror of a car. A ball is hanging at the other end of the string. The car is driving around in a circle, at a constant speed. Which of the following lists gives all of the forces directly acting on the ball?
A) tension and gravity
B) tension
C) tension, gravity, and the centripetal force
D) tension, gravity, the centripetal force, and friction
Answer: A
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A car starts from rest and travels a distance of 100 m in 10 seconds. The acceleration of the car is
A. 1.0 
B. 2.0
C. 2.5
D. 3.0
E. 3.5
A toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed using 1000 J of work, is
A) 20 W. B) 50 W. C) 100 W. D) 1000 W. E) 20,000 W.
In a spectroscopic binary system, the star showing the larger blue shift is
A) cooler and receding the fastest. B) less massive of the pair and receding slower. C) more massive and approaching us. D) less massive and approaching us at this moment. E) hotter and receding faster.
The study of the structure and evolution of the Universe is called ________.
A. archaeology B. cosmology C. astrology D. anthropology