The light-collecting area of the 10-meter Keck telescope is <u>4 times greater </u>than the light-collecting area of the 5-meter Hale telescope.
Why?
We can calculate the light-collecting area of a telescope by using its diameter/radius. To do that, we can use the following formula:
Now, to know how much greater is the collecting area of the 10-meter keck telescope compared to the collecting area of the 5-meter hale telescope, we need to calculate their light-collecting areas and compare them.
For the 10-meter keck telescope, we have:
For the 5-meter hale telescope, we have:
Now, comparing the areas, we have:
Hence, we have that the light-collecting area of the 10-meter keck telescope is 4 times greater than the light-collecting area of the 5-meter hale telescope.
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Its resistor :}...............
To minimize loss of heat or absorption of heat from surroundings
This one is complicated. Not hard, but several steps. The two 5-ohm resistors in series have a total resistance of 10 ohms. 1.6 A through 10 ohms means the battery is (1.6 x 10)=16 volts. Then ... 16 volts produces 2A of current through (16/2)=8 ohms of resistance. If 3 identical resistors in parallel look like like 8 ohms, then each one is (8 x 3)= 24 ohms. That's D.
Answer:
15.0 m/s
Explanation:
When elastic collision occurs, the final velocities, v of the bodies are obtained by
Where u and m denote initial velocities and mass while the subscripts 1 and 2 are for tennis ball and the other ball
Substituting 0.311 for mass of tennis, 0.0570 for mass of the other ball, 30.3 m/s for velocity of tennis ball and -19.2 m/s