Which of the following is NOT a conventional spacecraft design?
A) a matter—antimatter rocket
B) a chemical rocket
C) a solar sail
D) a nuclear rocket
A
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The dark age is a period lasting hundreds of millions of years until the formation of the first stars
Indicate whether the statement is true or false
The figure shows a cross section of three parallel wires each carrying a current of 15 A. The currents in wires A and C are out of the paper, while that in wire B is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 4.0-m length of wire C?
A. 90 mN B. 54 mN C. 30 mN D. 18 mN E. 36 mN
In the two-slit experiment, monochromatic light of frequency 5.00 × 1014 Hz passes through a pair of slits separated by 2.20 × 10-5 m. (c = 3.00 × 108 m/s)
(a) At what angle away from the central bright spot does the third bright fringe past the central bright spot occur? (b) At what angle does the second dark fringe occur?
A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 ? at 20°C and increases to 3.072 ? as indium just starts to melt
What is the melting point of indium? The temperature coefficient of resistivity for platinum is 3.927 × 10-3/C°. A) 136°C B) 351°C C) 156°C D) 116°C