A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at an equal shoulder level) by the catcher. At what point is the ball's speed at a minimum? Note: Air resistance is negligible
a. just after leaving the center fielder's hand
b. just before arriving at the catcher's mitt
c. at the top of the trajectory
d. speed is constant during entire trajectory
C
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Which of the following subatomic particles has the most mass?
a) the neutron b) the positron c) the proton d) the electron
Most of the waves in the electromagnetic spectrum are
A) red light. B) blue light. C) green light. D) invisible.
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 wavelength of the light is increased,
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.