Spaceship Earth can be self-sufficient in all resources

What will be an ideal response?


For all of human history this has been true, but only if we neglect the input of
energy from the Sun! That is not really self-sufficiency. In the future, off-Earth resources
will become more important.

Physics & Space Science

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The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called

a. an achromatic lens. b. active optics. c. a Schmidt-Cassegrain design. d. a Newtonian design. e. interferometry.

Physics & Space Science

The system shown is released from rest and moves 50 cm in 1.0 s. What is the value of M? All surfaces are frictionless.

A. 0.42 kg B. 0.34 kg C. 0.50 kg D. 0.59 kg E. 0.68 kg

Physics & Space Science

Replacing a wire resistor with another of the same material and length but with three times the diameter will have the effect of changing the resistance by what factor?

a. 1/3 b. 1/9 c. 3 d. 9

Physics & Space Science

Do magnetic lines of force represent lines of force along the entire length of which the force on a unit pole would have the same value? Explain your answer

Physics & Space Science