A sound level of 80 dB has __________ times the amplitude of a 60 dB sound
Fill in the blank(s) with correct word
ten
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Using only pencil and paper calculations, Arrhenius concluded that a doubling of the carbon dioxide concentration would raise global temperatures by about _____.
A. 1° C B. 2° C C. 5° C D. 15° C
What is the largest satellite (moon) in the Solar System?
A. Saturn's moon, Titan B. Neptune's moon, Triton C. Jupiter's moon, Ganymede D. Earth's moon
A 50-kg air conditioner is placed on top of a concrete pad with a cross-sectional area of 3.0 m2 and 20 cm thick. What is the change in thickness of the pad? Young's modulus for concrete is 2.3 × 1010 N/m2
A) 1.4 × 10-9 m B) 2.8 × 10-9 m C) 1.4 × 10-8 m D) 1.4 × 10-7 m E) 2.8 × 10-8 m
Redshift surveys give us
A) a 3-D layout of galaxies in space. B) a better value of the speed of light. C) an idea of how turbulent the intergalactic gas is. D) the total mass of the universe. E) a more accurate census of the Local Group.