A pion is an unstable particle that has a mean lifetime of 2.55 × 10-8 s. This is the time interval between its creation in a nuclear process and its extinction into decay products,
as measured in a frame of reference at rest with respect to the pion. An average pion is traveling at 0.230c relative to Earth. How far does it travel in its lifetime, relative to Earth?
A) 2.07 m
B) 1.81 m
C) 2.23 m
D) 3.22 m
E) 3.50 m
B
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Some automobiles have air bags installed on their dashboards as a safety measure. The impact of a collision causes the bag to inflate, and it then cushions a passenger's head when he is thrown forward in the car
Suppose that such a bag could lengthen the collision time between one's head and the dashboard by a factor of 10. What effect would this have on the force exerted on the head? A) The force would be reduced by a factor of about 3. B) The force would be reduced by a factor of about 1000. C) The force would be reduced by a factor of about 10. D) The force would not be reduced, but the energy transferred to the head would be, thereby minimizing the damage done. E) The force would be reduced by a factor of about 100.
Approximately how many brown dwarfs are believed to exist in the Milky Way galaxy?
A) 100,000 B) one million C) one billion D) one hundred billion E) ten trillion
Suppose it were possible to drill a frictionless cylindrical channel along a diameter of the Earth from one side of the Earth to another. A body dropped into such a channel will only feel the gravitational pull of mass within a sphere of radius equal to the distance of the mass from the center of the Earth. The density of the Earth is 5.52 × 10^3 kg/m3 and G = 6.67 × 10^-11 N×m2/kg2 . The mass
will oscillate with a period of a. 84.4 min. b. 169 min. c. 24.0 h. d. 1 130 h. e. 27.2 d.
Exclusion Principle: For the ground state of the hydrogen atom, which of the following numbers represents the correct value of the magnetic quantum number?
A. -1 B. 0 C. 1 D. 2 E. -2