What is the unusual result of mass transfer in the Algol binary system?
A) a helium white dwarf
B) a carbon white dwarf
C) a black dwarf
D) a red dwarf
E) a brown dwarf
A
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Parallel-Plate Capacitor: A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces. The plates are both circular with a radius of 6.50 cm. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)(a) How much excess charge must be on each plate to hold the oil drop steady?(b) Which plate must be positive, the upper one or the lower one?
What will be an ideal response?
Which of the following observations is explained by Einstein's General Theory of Relativity but NOT Newton's Universal Law of Gravitation?
A) how gravity acts at a distance B) planets periodically undergo apparent retrograde motion C) all objects fall to Earth at the same rate D) planets move faster in their orbits when they are closer to the Sun
Why is Supernova 1987A particularly important to astronomers?
A) It occurred only a few dozen light-years from Earth. B) It provided the first evidence that neutron stars exist. C) It was the first supernova detected in nearly 400 years. D) It provided the first observational evidence that supernovae actually occur. E) It was the nearest supernova detected in nearly 400 years.
A mass of 1.53 kg is attached to a spring and the system is undergoing simple harmonic oscillations with a frequency of 1.95 Hz and an amplitude of 7.50 cm. What is the speed of the mass when it is 3.00 cm from its equilibrium position?
A) 0.0368 m/s B) 0.551 m/s C) 0.421 m/s D) 0.842 m/s E) 0.919 m/s