If two objects are the same size but one object is 3 times hotter than the other object, the hotter object emits
A) 3 times more energy.
B) 9 times more energy.
C) 12 times more energy.
D) 81 times more energy.
E) none of the above
D
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Jupiter's _______________ shows that the planet cannot be as rigid as a Terrestrial planet
Fill in the blank(s) with correct word
A rod (length = 2.0 m) is uniformly charged and has a total charge of 40 nC. What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
a. 40 N/C b. 45 N/C c. 24 N/C d. 90 N/C e. 36 N/C
Magnetic Field of a Long Wire: Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/A)
A. 1.0 × 10-5 T B. 2.0 × 10-5 T C. 3.0 × 10-5 T D. 4.0 × 10-5 T E. 5.0 × 10-5 T
If star A is closer to us than star B, then Star A's parallax angle is
A) larger than that of Star B. B) smaller than that of Star B. C) hotter than that of Star B. D) fewer parsecs than that of Star B.