In everyday language, speed and velocity are synonyms, but in physics
A. velocity has only magnitude.
B. speed has only direction.
C. velocity has magnitude and direction.
D. speed has magnitude and direction.
E. velocity has only direction.
C. velocity has magnitude and direction.
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Even though modern astronomers know that stars are scattered through space at different distances, they still use what scientific model to describe celestial locations in the sky?
a. apparent visual magnitude b. Copernican revolution c. celestial sphere d. scientific orb e. planetarium dome
The observed temperature difference between the northern and southern hemispheres of Uranus:
A) is dozens of Kelvins. B) is hundreds of Kelvins. C) varies greatly. D) is about 10 Kelvin.
What is different between a particle and its antiparticle?
a. opposite electric charge b. opposite strangeness c. opposite charm d. all of the above
If a neutral element has the following chemical notation, how many electrons does it have?
fluorine-19 A) 9 B) 10 C) 11 D) 19 E) none of the above