The earliest Homo sapiens appeared about
A) 25 million years ago
B) 6 to 7 million years ago
C) 200,000 years ago
D) 545 million years ago
C
Physics & Space Science
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The Schwarzschild radius of a 1-Mo black hole is approximately
a. 3 km. b. 1,500,000 km, the size of the Sun. c. 150,000,000 km or 1 AU. d. 3 × 10^13 km or 1 pc.
Physics & Space Science
What is the average orbital speed of the Earth around the Sun? (Note: r = 1.5 x 1011 m and P = 3.16 107 s)
A. About 30 km/s. | ||
B. About 4.7 km/s. | ||
C. About 9.8 m/s2. | ||
D. 365 days. | ||
E. 1,000 km/s. |
Physics & Space Science
To be dimensionally consistent, velocity [L/T], force 
mass [M], and length [L] must be related as follows.
A. 
B. 
C. 
D. velocity = force length/mass
Physics & Space Science
Which of the following represents the equipotential lines of a dipole?
A.
B.
C.
D.
E.
Physics & Space Science