What is the usual symbol used to represent an amount of charge?
a. C b. q
c. e d. none of the above
b
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An object in a stable orbit continuously misses Earth because of its vertical velocity
Indicate whether the statement is true or false
If you wanted to observe stars behind a molecular cloud, in what wavelength of light should you observe?
A) ultraviolet B) visible C) infrared D) x-ray E) gamma ray
Once the helium flash occurs at stage 10, the star stabilizes again on the horizontal branch of the H-R diagram, but now hundreds of times as bright as on the main sequence
Indicate whether the statement is true or false
A 2.50-kg projectile is launched at an angle of 20.0° above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high. If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m, how much work has been done on the projectile by air friction?
a. –3.3E+3 J b. 1.7E+2 J c. –3.5E+3 J d. 2.4E+4 J