The unit of electric charge, the coulomb, is the charge on a
A) single electron.
B) specific large number of electrons.
C) neutron.
D) specific number of neutrons.
E) quark.
Answer: B
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When you look at a single-slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is decreased,
A. the pattern shrinks in size (central maximum less wide; other maxima in closer to it). B. the pattern increases in size (central maximum wider; other maxima farther from it). C. it does not affect the size of the pattern. D. the width of the central maximum increases, but the other maxima do not change in position or width. E. the width of the central maximum decreases, but the other maxima do not change in position or width.
You are holding on to the axle of a spinning bicycle wheel with one hand on either side of the wheel. The top part of the wheel is moving away from you and the bottom is moving toward you and the axle is horizontal. In what direction do you need to apply a torque for the wheel to turn to the left?
A) toward you B) away from you C) vertically up D) vertically down E) to your right
How many significant figures are in the number 0.0037010?
A) four B) five C) six D) seven E) eight
A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position?
a. 2.6 m/s b. 3.1 m/s c. 3.5 m/s d. 1.9 m/s e. 2.3 m/s