If an astronaut with a weight of 800 N on Earth steps on a bathroom scale while he is in Earth orbit, the scale will read
A. zero.
B. less than 800 N.
C. 800 N.
D. more than 800 N.
Ans: A. zero.
Physics & Space Science
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A comet that has a semi-major axis of 100 AU must have a period of about
A. 20 years. B. 100 years. C. 1,000 years. D. 10 years.
Physics & Space Science
Volume can be measured in units of m3 . Which of the following unit combinations also result in volume?
a. ft2/m b. cm·ft c. cm2in. d. m2·cm·ft
Physics & Space Science
A solenoid of length 4.00 cm and cross-sectional area 2.00 cm2 has 80 turns. What is its self- inductance?
A. 160 
H
B. 120 H
C. 80.0 H
D. 40.0 H
E. 0.500 H
Physics & Space Science
You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J
What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 0.11 nm B) 0.22 nm C) 0.15 nm D) 0.18 nm
Physics & Space Science