Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers.
B) Elliptical galaxies probably contain far more dark matter than spiral galaxies.
C) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies.
D) Elliptical galaxies probably contain far less dark matter than spiral galaxies.
C
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Studying the magnetospheres of the jovian planets has allowed us to measure their
A) orbital periods. B) interior rotation rates. C) ring system diameters. D) gravity. E) orbital radius.
Specific Heat: A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB, what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K.
A. 0.940 K B. 1.10 K C. 1.26 K D. 2.78 K E. 3.78 K
At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?
A) 55.7 dB B) 57.5 dB C) 75.5 dB D) 77.5 dB
For visible light, which property of visible electromagnetic waves changes with color?
A. Frequency and wavelength B. Amplitude and frequency C. Frequency D. Wavelength E. Amplitude