Two identical stars are located at different distances, one star at 2.0 pc and the other at 6.0 pc. How many times greater is the apparent brightness of the nearer star when compared to the more distant one?
A)
1.7 times
B)
3.0 times
C)
9.0 times
D)
18 times
E)
27 times
C
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Springs: A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The brick is kept from sliding down the plane by an ideal spring that is aligned with the surface and attached to a wall above the brick. The spring has a spring constant (force constant) of 120 N/m. By how much does the spring stretch with the brick attached?
A. 360 cm B. 240 cm C. 14 cm D. 24 cm E. 36 cm
A flat circular coil has 200 identical loops of very thin wire. Each loop has an area of 0.12 m2 and carries 0.50 A of current. This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop
What is the magnitude of the magnetic torque on the coil? A) 0.25 N ? m B) 0.52 N ? m C) 2.5 N ? m D) 5.2 N ? m
The development of physics prior to about 1900 is called ______________ physics
Fill in the blank(s) with correct word
The sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. sun is on the ecliptic and is never on the celestial equator.