Periodic waves with a period of 0.026 s travel along a rod at 1200 m/s. What is the wave number k of the waves?
A)
5.0 m-1
B)
31 m-1
C)
6.9 m-1
D)
0.20 m-1
E)
68 m-1
D
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The Tonga Trench in the Pacific Ocean is 36,000 feet deep. Assuming that sea water has an average density of 1.04 g/cm3,
calculate the absolute (total) pressure at the bottom of the trench in atmospheres. (1.00 in = 2.54 cm, 1.00 atm = 1.01 × 105 Pa) A) 1.1 × 103 atm B) 1.1 × 108 atm C) 1.1 × 105 atm D) 1.1 × 106 atm E) 2.1 atm
______________ has the general formula (C6H10O5)n, where n may take on values up to 3000
Fill in the blank(s) with correct word
The radiation from cell phones
A. does not cause cancer B. causes cancer, but not enough to worry C. causes over 1 % of the cancer in those who use them D. protects users from cosmic rays
In what way does our theory of nuclear fusion predict that the Sun should be different today than it was when fusion began about 4-1/2 billion years ago?
A) The Sun's mass should be about 30% higher today. B) The Sun's mass should be about 30% lower today. C) The Sun's luminosity should be about 30% higher today. D) The Sun's radius should be about 30% higher today. E) The Sun's distance from Earth should be about 30% lower today.