Why must telescopes observing at long infrared (that is, far-infrared) wavelengths be cooled to low temperatures?
What will be an ideal response?
To reduce thermal radiation from the mirror and detector parts of the telescope.
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How many Saros cycles does it take for the same eclipse to occur at about the same location on Earth?
a. one cycle b. three cycles c. 18 cycles d. 22 cycles e. 54 cycles
What are the two largest moons of Neptune and what makes them peculiar objects in our Solar System?
What will be an ideal response?
Refer to Figure 6-11. Block A has a mass of 3.00 kg and rests on a smooth table and is connected to block B, which has a mass of 2.00 kg, after passing over an ideal pulley, as shown. Block B is released from rest. How long does it take block B to travel 80.0 cm?
A. 0.494 s B. 0.785 s C. 0.639 s D. 0.935 s E. 0.404 s
A gallon container is filled with gasoline. How many gallons are lost if the temperature increases by 25°F? (The volume expansion of gasoline is 9.6 × 10^-4 (°C)-1.) (Neglect the change in volume of the container.)
a. 2.4 × 10^-2 b. 1.3 × 10^-2 c. 3.6 × 10^-2 d. 4.8 × 10^-2 e. 9.6 × 10^-2