How does the placement of the eyepiece with Newtonian and Cassegrain reflectors differ?
What will be an ideal response?
In the Newtonian, the eyepiece is located on the front side of the tube, but with the Cassegrain, it lies behind the hole in the main mirror.
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Why can't we see the center of our galaxy with our eyes?
A) We are in the center of the Milky Way. B) There are no stars in the center of the Milky Way, just a supermassive black hole. C) Interstellar dust and gas absorbs and scatters visible light before it can reach us from the center. D) The center of the Milky Way does not emit enough visible light. E) Stars are too densely spaced in the plane of our galaxy to see all the way to the center.
What is the rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a thickness of 4.00 mm when the outside temperature is -10.0°C and the inside temperature is 25.0°C?
The thermal conductivity of glass is 0.105 W/(m?K) and the specific heat of glass is 0.180 cal/(g?°C). A) 24.2 W B) 3.81 W C) 18.6 W D) 47.3 W E) 110 W
A boy kicks a football with an initial velocity of 28.0 m/s at an angle of 30.0° above the horizontal. What is the highest elevation reached by the football in its trajectory?
A) 11.2 m B) 10.0 m C) 12.7 m D) 9.40 m E) 41 m
When running and jumping to score, a basketball player seems to "hang" in the air because
a. his or her acceleration is zero. b. his or her horizontal velocity is quite small. c. both components of motion are zero. d. his or her vertical velocity is quite small. e. levitation is possible with practice.