If a star system at 30 parsecs distance is found to be broadcasting intelligent radio signals, then their news is already ________ years old
Fill in the blank(s) with correct word
about 93
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If galaxy A is four times more distant than galaxy B, then according to the Hubble Law, galaxy A will recede ____ than galaxy B
a. 16 times faster b. 4 times faster c. 2 times faster d. 1.2 times faster e. 0.25 times faster
What types of mirrors always produce upright images?
A. Converging and plane B. Diverging and plane C. Converging and diverging D. The image from all types of mirrors is always upright.
A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then is exerted on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters
What is the magnitude of the force F?
The highest energy level in an atom is its
a. ionization level. b. emission level. c. absorption level. d. photon level. e. ground state.