A 45-kg person steps on a scale in an elevator. The scale reads 460 N. What is the elevator doing?
What will be an ideal response?
It is accelerating upward at 0.41 m/s2.
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If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the initial intensity of the beam?
a. 
b. 
c. 
d. 
e. 
A(n) ______________ image is defined as one that cannot be brought to a focus on a screen
a. virtual b. real c. upright d. inverted
Single concave spherical mirrors produce images that
A) are always smaller than the actual object. B) are always larger than the actual object. C) are always the same size as the actual object. D) could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object. E) are always real.
An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P?
?
?
a.
0
b.
?/2
c.
?
d.
2?
e.
4?