Velocity Addition: A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative to the ship must the spaceship launch a shuttlecraft in the forward direction so that it will be moving away from Earth at 98.7% the speed of light?

A. 0.91c
B. 0.97c
C. 0.93c
D. 0.99c
E. 0.84c


Answer: C

Physics & Space Science

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A) Fusion reactions slow down, core shrinks and heats. B) Fusion reactions speed up, core expands and cools. C) Fusion reactions speed up, the core shrinks and cools. D) Fusion reactions slow down, the core expands and heats.

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Add the following lengths, each obtained from a different measuring instrument, and round off the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m

What will be an ideal response?

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Which of the following ions is not isoelectronic with the other three?

a. Cl- b. K+ c. Br- d. P3-

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Which of the following is unique concerning the so-called "Planck's time"?

a. It is the time Planck took to solve the blackbody radiation problem. b. It is the time light takes to travel across a proton. c. It is about equal to the moment of creation of the universe. d. There is no such thing as Planck's time

Physics & Space Science