An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/
A)
2.0 mT
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What thermodynamic quantity is held constant in Boyle's law?
a. pressure b. volume c. temperature d. Both pressure and volume are each held constant.
The star Arcturus shows a large proper motion, almost perpendicular to the galactic plane. What Population might we assume it belongs to, and why?
What will be an ideal response?
A blimp is filled with 200 m3 of helium. How much mass can the balloon lift? The density of helium is one-seventh that of air, and the density of air is 1/800 that of water. Consider the mass of the balloon to be negligible
a. 115 kg b. 214 kg c. 315 kg d. 415 kg e. 37 kg
If helium nuclei and protons are each accelerated from rest through the same potential difference, how do the resulting speeds compare?
A. the protons attain twice the speed of the helium nuclei B. the protons attain 1.4 times the speed of the helium nuclei C. the helium nuclei attain twice the speed of the protons D. the helium nuclei attain 1.4 times the speed of the protons E. they both attain the same speed