A clown 2 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet?
A. 1 m from the floor
B. 50 cm from the floor
C. 25 cm from the floor
D. at the bottom of the mirror
E. 1.5 m from the floor
Answer: A
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Melting and freezing are
A) changes of phase. B) opposite processes. C) both of these D) neither of these
Express -40°C in °F
A) -72°F B) 4.4°F C) -40°F D) -54°F
A projectile is launched from ground level at an angle of 50.0° above horizontal with a speed of 30.0 m/s. If the projectile is moving over level ground, how long is it in the air before it again contacts the ground?
A) 8.12 s B) 2.35 s C) 4.69 s D) 6.44 s E) 11.3 s
The maximum permissible workday dose for occupational exposure to radiation is 26 mrem. A 55-kg laboratory technician absorbs 3.3 mJ of 0.40-MeV gamma rays in a workday. The relative biological efficiency (RBE) for gamma rays is 1.00
What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage? A) 0.23 B) 0.25 C) 0.28 D) 0.30 E) 0.32