A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1. (Assume the room temperature is 70°F.)
A. 217
B. 180
C. 90
D. 68
E. 850
Answer: A
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A policeman investigating an accident measures the skid marks left by a car. He determines that the distance between the point that the driver slammed on the brakes and the point where the car came to a stop was 28.0 m
From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? (This car was not equipped with anti-lock brakes.) A) 10.7 m/s B) 12.8 m/s C) 21.4 m/s D) 32.9 m/s E) 45.7 m/s
From the point of view of a muon produced high in the atmosphere, the reason it can get to the ground before it decays is because
a. relativity gives it extra time to get there b. of the uncertainty principle c. it is a short distance to the ground d. relativity shortens the distance to the ground
Nuclear Binding Energy: Radium-226 decays into radon-222 plus an alpha particle. The relevant masses are
How much energy is released in this process? (1 u = 931.5 MeV/c2)
A. 4.24 MeV B. 3.76 MeV C. 4.87 MeV D. 5.05 MeV E. 5.39 MeV
What color is an H I region?
A) red from ionized hydrogen's alpha transition, such as in the Orion Nebula B) red from reddening due to dust C) colorless; it emits in the radio region D) blue from the scattering of light off the tiny atoms, such as around the Pleiades E) blue from ionized helium's alpha transition, such as the Horsehead Nebula