The slope of a line connecting two points on a position versus time graph gives
A) instantaneous velocity.
B) average velocity.
C) instantaneous acceleration.
D) average acceleration
E) none of the given answers.
B
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An object accelerates when it slows or its direction of movement changes
a. true b. false
What is the resolving power of a diffraction grating that is capable of just distinguishing between two wavelengths of 568.20 nm and 569.60 nm? (1 nm = 10?9 m)
a. 1.10 b. 406 c. 487 d. 812 e. 568.9
How do elliptical galaxies typically compare to spiral galaxies?
A) Elliptical galaxies are redder and rounder. B) Elliptical galaxies are redder and flattened. C) Elliptical galaxies are bluer and rounder. D) Elliptical galaxies are bluer and flattened. E) Elliptical galaxies are always much smaller.
If the angular size of a spherical object is known, along with its distance from Earth, what third quantity can be determined?
A) the object's brightness B) the object's mass C) the baseline D) the object's diameter