The Hubble time is expressed as:
A) H × D.
B) D/v.
C) 1/H.
D) H × T.
E) the critical density/H.
C
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The algebraic sum of the changes of potential around any closed circuit loop is
a. zero. b. maximum. c. zero only if there are no sources of emf in the loop. d. maximum if there are no sources of emf in the loop. e. equal to the sum of the currents in the branches of the loop.
In a mass spectrometer, a singly-charged particle (charge e) has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m
What is the mass of this particle? (e = 1.60 × 10-19 C) A) 3.2 × 10-28 kg B) 6.4 × 10-28 kg C) 1.7 × 10-27 kg D) 4.5 × 10-27 kg E) 3.1 × 10-31 kg
Many of the Kuiper belt objects, including Pluto, are caught in a 3:2 resonance with Neptune
a. True b. False Indicate whether the statement is true or false
To the nearest percent, what fraction of an iceberg is submerged? (?ice = 917 kg/m3, ?sea = 1.03 × 103 kg/m3.)
A. 95% B. 93% C. 91% D. 89% E. 77%