The rotational inertia of the dumbbell (see figure) about axis A is twice the rotational inertia about axis B. The unknown mass is:
5
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A cyclotron is designed to accelerate protons (mass 1.67 x 10-27kg) up to a kinetic energy of 2.5 x 10-13 J. If the magnetic field in the cyclotron is 0.75 T, what is the radius of the dipole magnets in the cyclotron?
A. 14 cm B. 24 cm C. 17 cm D. 5.8 cm
How do we know that chlorine caused the ozone hole?
A) From measurements of the relationship between the experimental release of chlorine from the land surface in Antarctica, and the depletion of ozone that appeared in the atmosphere a few days later. B) From laboratory experiments involving a replica of the atmosphere over Antarctica. C) From the relationship between the release of chlorine by the Pinatubo volcano and the depletion of ozone over Antarctica a few months later. D) From theories of the chemical destruction of ozone, coupled with computer calculations. E) From measurements of chlorine monoxide and ozone in the Antarctic atmosphere as the sun reappeared in the spring.
Galaxy A is 300 Mpc from Galaxy B. Hubble's Law says that V=H0 x D. About how fast is Galaxy A receding from the perspective of Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A) 75 km/s B) 15000 km/s C) 30000 km/s D) 225 km/s E) 22500 km/s
In the process of fluorescence, the input is high-frequency light and the output is
A) higher-frequency light. B) equally high-frequency light. C) lower-frequency light. D) none of the above