A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?
A) 2.5 m/s
B) 5.0 m/s
C) 10 m/s
D) 0 m/s
E) 1.3 m/s
D
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In the context of supernova explosions, the _____ is a young remnant, only about 960 years old and about 9 ly in diameter
A) Lagoon Nebula B) Carina Nebula C) Eagle Nebula D) Crab Nebula
The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air, how long does it take the football to reach the top of its trajectory?
A) 1.0 s B) 2.0 s C) 3.0 s D) 4.0 s E) 5.0 s
In the figure below the blue object arrow is replaced by one that is much taller than the lens. How many rays from the object will strike the lens?
Relative to a fossil-fuel plant, a nuclear power plant produces
A) more electricity. B) less heat and smoke. C) less pollution. D) all of the above E) none of the above