Imagine that you are trying to stop neutrinos with a lead shield. How thick would you need to make this shield to ensure that it can stop an average neutrino?
A) about one meter
B) about 700,000 kilometers (the radius of the Sun)
C) about 150 million kilometers (the size of an astronomical unit)
D) about one light-year
E) about 14 billion light-years (the size of the observable universe)
D) about one light-year
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An oxygen molecule has a moment of inertia of 5 × 10^?46 kg ? m2 . Calculate the bond length (in nm). Recall that the atomic mass of oxygen is 16 u (1 u = 1.66 × 10^?27 kg)
a. 0.3 b. 0.1 c. 0.2 d. 0.4 e. 0.5
The Moon's redness during a lunar eclipse is due to
A) light of lower frequencies reflected from the Moon. B) excess infrared radiation. C) an optical illusion. D) refracted light from Earth's sunrises and sunsets. E) none of the above
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2-m-high ladders. The center of mass of the Earth (mE = 5.90 
1024 kg) is then displaced
A. 0 m. B. 1.84 × 10?23 m. C. 1.84 × 10?14 m. D. 1.80 × 10?13 m. E. 2 m.
A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling towards the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 83 Hz B) 85 Hz C) 87 Hz D) 89 Hz E) 91 Hz