At the center of our Galaxy lies
A) a quasar.
B) a huge emission nebula.
C) an intensely bright visible superstar.
D) the largest of all globular clusters.
E) a black hole of millions of solar masses.
E
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The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C. What is the charge on the object? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -4.5 nC B) +4.5 nC C) -5.0 nC D) +5.0 nC
What are the mass number, the atomic number, and neutron number for each of the following particles?
(a) proton (b) neutron (c) alpha particle What will be an ideal response?
A Frisbee is thrown horizontally by a student and travels in a straight line. Viewed from above, the Frisbee is seen to be in clockwise rotation. From the point of view of the student, in which direction is the angular momentum of the Frisbee while in flight?
a. The Frisbee has no angular momentum since it is moving along a straight line away from the student. b. The direction of the angular momentum is along the line away from the student. c. The direction of the angular momentum is toward the right since this was a right-handed throw. d. The direction of the angular momentum is downward, perpendicular to the path of the Frisbee.
If CP for an ideal gas is 35.4 J/mol×K, which of the following is CV for this gas?
a. 12.5 J/mol×K b. 20.8 J/mol×K c. 29.1 J/mol×K d. 27.1 J/mol×K e. 43.4 J/mol×K