What accounts for the additional few minutes of sunlight we experience daily, before sunrise and after sunset?
What will be an ideal response?
Answer: Atmospheric refraction adds to daylight time. When we see the Sun on the horizon, it is already below it. Refraction makes it appear higher in the sky, and we have about 9 minutes of additional sunlight per day because of atmospheric refraction.
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A wheel (radius = 0.20 m) is mounted on a frictionless, horizontal axis. A light cord wrapped around the wheel supports a 0.50-kg object, as shown in the figure. When released from rest the object falls with a downward acceleration of 5.0 m/s2. What is the rotational inertia of the wheel?
?
?
A. 0.023 kg?m2 B. 0.027 kg?m2 C. 0.016 kg?m2 D. 0.019 kg?m2 E. 0.032 kg?m2
The break-up of Pangaea resulted in the separation of
A) habitats. B) landmasses. C) plant and animal life. D) landmasses, and plants and animals and their habitats.
During heating, an amorphous material starts to soften at the ______________transition temperature.
Fill in the blank(s) with the appropriate word(s).
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5c and a spaceship moves toward it (to the west) at a speed of 0.8c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7c. b. 0.21c. c. ?0.21c. d. 0.93c. e. ?0.93c.