Masses of the planets are easiest to determine if:
A) they are terrestrial and the extra size of the planet's disk can be measured.
B) they are jovian and their oblateness can be found.
C) they have natural satellites whose motions can be precisely measured.
D) they are dense and easily deflect the path of passing spacecraft.
E) they move rapidly and their periods are easily measured.
C
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A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 ? ? m. When this wire carries a current of 0.50 A, what is the voltage across its ends?
A) 0.0030 V B) 0.32 V C) 0.64 V D) 1.6 V
Exclusion Principle: In its ground state, the quantum numbers (n, ?, m1, ms) for hydrogen are, respectively,
A. 1, 1, 1, 1. B. 1, 0, 0, 0. C. 1, 0, 0, ±1/2. D. 1, 1, 1, ±1/2.
Magnesium has 12 protons. How many electrons are in its first energy level?
a. 2 b. 4 c. 6 d. 8 e. 10
If you are driving 72 km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive period?
A) 40 m B) 20 m C) 18 m D) 80 m