In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP
B) flife
C) NHP × flife
D) NHP / flife
C
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Which of the following objects is considered to possibly contain a black hole?
a. The central star of the Crab nebula b. The Orion nebula. c. LMC X-3 d. Algol e. PSR 1257+12
A force of 10.0 N is applied to a wire with an un-stretched length of 4.00 m and a diameter of 5.00 mm. If the wire changed length by 1.20 mm, then the stress in the wire is
a. 
b. 
c. 
d. 
e. 
The figure below represents a string which has a heavy section and a light section. The mass per unit length of the heavy section is 16 times as large as the mass per unit length of the light section. When the string is under tension, the speed of a pulse traveling in the heavy section is ____ times the speed of that same pulse traveling in the light section
a. b. c. d. 2 e. 4
What should be the approximate diameter (in fm) of a nucleus containing 92 protons and 143 neutrons?
What will be an ideal response?