In the context of astronomy, _____ is the area visible in an image
A) the field of view
B) the visible spectrum
C) a reference field
D) point of reference
A
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A parachutist jumps out of an airplane and opens her parachute. She then floats downward at a constant rate. Why is she not accelerating?
A. The parachutist exerts a gravitational pull on Earth that is equal to its pull on her. B. As she falls, she is weightless and therefore cannot accelerate. C. The parachute has very little mass, so its inertia is negligible. D. She is accelerating, but gravity's pull is weak at high altitudes. E. The parachute provides an upward force to balance gravity, so the net force is zero.
Light travels fastest in
A) warm air. B) cool air. C) a vacuum.
The __________ occurs when electrons are emitted when light strikes the surface of a metal
Fill in the blank(s) with correct word
When polyethylene is melted, the only bonds that are broken are the weak ______________ bonds between the long-chain molecules.
Fill in the blank(s) with the appropriate word(s).