Nearly all the elements found in nature were formed inside stars, EXCEPT for:
A) carbon and silicon.
B) hydrogen and helium.
C) helium and carbon.
D) silver and technetium.
E) uranium and radium.
B
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How can precision of a measuring instrument be increased?
A converging mirror with a focal length f forms an image of the moon. Where is the image?
A. Very close to f behind the mirror B. At the surface of the mirror C. At the radius of curvature of the mirror D. Very close to f in front of the mirror
A 600-kg car makes a 90° turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum?
A) 19.1 × 103 kg?m/s B) 10.2 × 103 kg?m/s C) 9.55 × 103 kg?m/s D) 12.0 × 103 kg?m/s E) 22.2 × 103 kg?m/s
In a situation where an object can move only along the x axis, a book states “the force on the object is F = -kx, where k is a constant, and x is the object’s position coordinate.” Is F being used here as a shorthand symbol for 
(A) or Fx (C)?
A. A B. C