Which graph shows an object moving with a constant non-zero velocity?
GRAPH A
GRAPH B
GRAPH C
A constant velocity would have a position versus time graph with a constant slope (not one of the choices) or a velocity versus time graph with a horizontal line (graph B).
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A star will experience a helium flash if
a. it is less massive than about 3 solar masses b. its has become a red giant star c. its has formed a helium core d. the material in the core has gradually become degenerate e. All of the above must be true.
Magnetic Field of a Long Wire: At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A)
A. 1.0 mm B. 1.0 cm C. 2.0 cm D. 3.0 cm E. 4.0 cm
Why is Newton's version of Kepler's third law so useful to astronomers?
A) It can be used to determine the masses of many distant objects. B) It allows us to calculate distances to distant objects. C) It tells us that more-distant planets orbit the Sun more slowly. D) It explains why objects spin faster when they shrink in size.
For a diverging lens, rays that enter the lens directed along lines toward the far focal point emerge from the lens
A. Parallel to the optical axis B. Diverging from the near focal point C. Converging at the far focal point D. Diverging from the far focal point.