Refracting Telescope: The focal length of the objective lens of a telescope is 0.20 m and the eyepiece has a focal length of 1.6 m. What is the length of this telescope?
A. 8.0 m
B. 1.4 m
C. 0.90 m
D. 1.6 m
E. 1.8 m
Answer: E
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Two fireworks explode at the same position on the 4th of July. A stationary observer notices that the time interval between the two events was 5.00 seconds. A second observer flies past the fireworks at a speed of 0.600c. What value does she obtain when she measures the time interval between the two explosions?
A. 8.33 s B. 6.25 s C. 4.00 s D. 3.00 s E. 5.00 s
When a 2.75-kg fan, having blades 18.5 cm long, is turned off, its angular speed decreases uniformly from 10.0 rad/s to 6.30 rad/s in 5.00 s
(a) What is the magnitude of the angular acceleration of the fan? (b) Through what angle (in degrees) does it turn while it is slowing down during the 5.00 s? (c) If its angular acceleration does not change, how long after it is turned off does it take the fan to stop.
In which atmospheric layer does all our weather occur?
What will be an ideal response?
Suppose Earth's rotation axis were tilted by 45 degrees instead of 23.5 degrees. How would the number of daylight hours be different on December 21 in the United States (or any northern hemisphere country)?
A) There would be more hours of daylight than we have with a 23.5 degree tilt. B) There would be fewer hours of daylight than we have with a 23.5 degree tilt. C) The number of daylight hours would be about the same as it is if its tilt were 23.5 degrees.