Glass is transparent to
A) infrared light.
B) visible light.
C) ultraviolet light.
D) all of the above
Answer: B
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A(n) ______ is the digital file that specifies the combination of character data.
A. typeface B. font C. serif D. font-family
The Department of Energy develops a new reversible engine which has a COP of 4 when operated as a refrigerator and a COP of 5 when operated as a heat pump. What is its efficiency when operated as an engine doing work?
A) 10.% B) 20.% C) 25.% D) 45.% E) 80.%
A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible
A) 10 m/s B) 15 m/s C) 0.15 km/s D) 0.20 km/s E) 49 m/s
Today, the uranium found on Earth contains 0.720% 235U (with a half-life of 0.700 billion years) and 99.28% 238U (with a half-life of 4.50 billion years)
At a time 2.20 billion years ago, what percent of the uranium on Earth was 238U (assuming that no other uranium isotopes were present)? A) 95.6% B) 2.18% C) 6.29% D) 8.68% E) 4.53%