Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the amount of distortion caused by a gravitational lens
B) measuring the temperature of X-ray gas in the intracluster medium
C) measuring the orbital velocities of galaxies in the cluster
D) none of the above
A
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Building codes usually limit the current carried by a No. 14 copper wire to 15 A. Many household circuits are wired with this size wire. What is the drift velocity of the electrons in this case? The diameter of this wire is 1.6 mm
Assume one conduction electron per atom in copper. The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m3. Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C. A) 5.51 × 10-4 m/s B) 1.65 × 10-3 m/s C) 4.56 × 10-4 m/s D) 4.89 × 10-5 m/s E) 4.44 × 10-2 m/s
Which is the smallest entity in the following list?
A. Molecule B. Electron C. Nucleus D. Atom
The spectacular image called "Einstein's Cross" is direct evidence of which of the following phenomenon
A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the frictionless hinges of the door
The door begins to rotate with an angular acceleration of 2.00 rad/s2. What is the moment of inertia of the door about the hinges? A) 4.28 kg ? m2 B) 7.52 kg ? m2 C) 1.88 kg ? m2 D) 0.684 kg ? m2 E) 2.74 kg ? m2