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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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

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

Which of the following represents the equipotential lines of a dipole?

A.


B.

C.

D.

E.

Physics & Space Science

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