Time Dilation: A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light. It is unstable, and is observed to decay in an average 37.0 ?s. If this particle were at rest in the laboratory, what would be its average lifetime?
A. 2.9 µs
B. 18 µs
C. 5.3 µs
D. 12 µs
E. 4.3 µs
Answer: A
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A heat conducting rod, 1.40 m long, is made of an aluminum section that is 0.50 m long and a copper section that is long. Both sections have cross-sectional areas of
The aluminum end and the copper end are maintained at temperatures of and respectively. The thermal conductivity of aluminum is 205 W/m ? K of copper is 385 W/m ? K. The rate at which heat is conducted in the rod is closest to A) 20 W. B) 18 W. C) 23 W. D) 25 W. E) 28 W.
Which of the following is the best answer to the question, "Why does the Sun shine?"
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Based on observations, which of the following statements about stars in the Milky Way is generally true?
A) The older the star, the lower its abundance of heavy elements. B) The younger the star, the higher its mass. C) The older the star, the faster its orbital speed. D) The less massive the star, the older it is. E) The older the star, the bluer its color.
The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion. Assume that 30.0 cm3 of gasoline is atomized into N spherical droplets. Each droplet has a radius of 1.0 × 10^?5 m. Find the total surface area of these N spherical droplets
a. 3.0E+4 cm2 b. 1.2E+5 cm2 c. 1.8E+5 cm2 d. 9.0E+4 cm2 e. 1.1E+5 cm2