What problem do refractor telescopes have that reflectors don't?
A) chromatic aberration
B) light loss from secondary elements
C) diffraction limited resolution
D) atmospheric blurring
E) bad seeing
A
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A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact
The specific heat capacity of aluminum is more than double that of copper. Which object experiences the greater temperature change during the time the system takes to reach thermal equilibrium? A) the copper B) the aluminum C) neither; both experience the same size temperature change D) it is impossible to tell without knowing the masses E) it is impossible to tell without knowing the volumes
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
a. 2.0 × 10^4 J. b. 2.5 × 10^4 J. c. 1.7 × 10^3 J. d. 1.5 × 10^3 J. e. 4.0 × 10^4 J.
A Boeing 737 airliner has a mass of 20 000 kg and the total area of both wings (top or bottom) is 100 m2 . What is the pressure difference between the top and bottom surface of each wing when the airplane is in flight at a constant altitude?
a. 1 960 N/m2 b. 3 920 N/m2 c. 7 840 N/m2 d. 4 560 N/m2 e. 3 070 N/m2
Why is the light from near a black hole redshifted?
What will be an ideal response?