What was Miller and Urey trying to replicate in their experiment?
a. the formation of cell
b. the formation of ozone
c. the formation of photosynthesis
d. the formation of organic molecules
e. the formation of liquid water
d
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A plane truss with span length L 5 4.5 m is constructed using cast iron pipes (E 5 170 GPa) with a cross-sectional area of 4500 mm2. The displacement of joint B cannot exceed 2.7 mm. The maximum value of loads P is approximately:
(A) 340 kN
(B) 460 kN
(C) 510 kN
(D) 600 kN
The Drake equation now tells us that the number of technological civilizations in our Galaxy at this time is:
A) only our own. B) five to ten at most. C) perhaps 3,000. D) millions. E) not known; insufficient data to compute.
The speed v of an object falling with a constant acceleration g can be expressed in terms of g and the distance traveled from the point of release, h, as v = agbhc, where a, b, and c, are dimensionless constants. What must be the values of b and c?
What will be an ideal response?
At point P the magnetic field due to a long straight wire carrying a current of 2.0 A is 1.2 µT. How far is P from the wire? (?0 = 4? × 10-7 T ? m/A)
A) 33 cm B) 22 cm C) 11 cm D) 55 cm E) 44 cm