A 1.00 mW laser produces photons of wavelength 633 nm. How many photons per second does the laser emit?
a. 
b. 
c. 
d. 
e. 
c.
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When an apple falls to the ground, momentum is transferred to the ground. The momentum absorbed by the ground is
A) negligible compared to the momentum of the apple. B) greater if the apple bounces. C) greater than that of the apple whether or not bouncing occurs. D) none of the above
Diagram 3-1 shows three approximate locations of the setting Sun along the western horizon. Which number indicates the location of the Sun at sunset on December 21 (winter Sun) for an observer at a latitude of 48° north of the equator? Choose the best answer
a. 1
b. 2
c. 3
d. The Sun will set in the east for an observer in the southern hemisphere.
e. The Sun will not set on December 21 at this latitude.
When a hunter fires a rifle, the hunter feels a force against her shoulder. Explain why
What will be an ideal response?
Equilibrium: Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. 
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the upper block, A?
A. 
B. 
C. 
D. 
E. 