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

Physics & Space Science

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Physics & Space Science

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?

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Physics & Space Science

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

Physics & Space Science