Evidence for dark matter is exhibited by the
A) relatively similar speeds at which all stars in a galaxy orbit the galactic nucleus.
B) speed at which galaxies orbit one another within clusters.
C) degree to which galaxy clusters exhibit gravitational lensing effects.
D) All of the above
Answer: D
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Energy Conservation With Conservative Forces: A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible.
A. 0.20 km/s B. 15 m/s C. 10 m/s D. 0.15 km/s E. 49 m/s
A string on a violin is stretched between two points 20.00 cm apart with a tension of 120.0 N. The mass/length of the string is 0.002000 kg/m. The frequency of the mode next higher than the fundamental mode is
A. 1,400 Hz. B. 1,322 Hz. C. 1,225 Hz. D. 1,558 Hz. E. 2,120 Hz.
The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is nuclear fusion
Indicate whether the statement is true or false
Which subatomic particles are arranged in various energy levels or orbitals?
a. electrons only b. protons only c. neutrons only d. electrons and protons e. protons and neutrons