A fisherman in a stream 39 cm deep looks downward into the water and sees a rock on the stream bed. How deep does the stream appear to the fisherman? The index of refraction of the water is 1.33
A) 29 cm
B) 52 cm
C) 33 cm
D) 45 cm
A
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The escape velocity of an object depends on I. the mass of that object. II. the mass of the object trying to escape. III. the distance from the center of the object and the escaping object. IV. the speed of light
a. I, II, III, & IV b. I & II c. I & III d. I, II, & IV e. I, III, & IV
Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star B will be
A) the same. B) four times as much. C) one-fourth as much. D) half as much. E) twice as much.
Which season is shown in the picture for the southern hemisphere?
a. spring
b. summer
c. fall
d. winter
Uncertainty Principle Using Momentum and Position: An electron is known to be confined to a region of width 0.10 nm. What is an approximate value for the least kinetic energy it could have, in electron-volts? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, (melectron = 9.11 × 10-31 kg)
A. 1.1 eV B. 0.88 eV C. 3.8 eV D. 8.8 eV E. 17 eV