Why can't we see past the cosmological horizon?
A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born.
B) We do not have big enough telescopes.
C) The cosmological horizon is infinitely far away, and we can't see to infinity.
D) Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond it.
A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born.
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When an ideal gas undergoes a slow isothermal expansion:
A. the work done by the gas is the same as the energy absorbed as heat B. the work done by the environment is the same as the energy absorbed as heat C. the increase in internal energy is the same as the energy absorbed as heat D. the increase in internal energy is the same as the work done by the gas E. the increase in internal energy is the same as the work done by the environment
A space satellite weighs 100,000 newtons on Earth. When orbiting at a height of 6000 km [one Earth-radius] above Earth, its weight is
A) zero. B) 25,000 newtons. C) 50,000 newtons. D) 400,000 newtons. E) 100,000 newtons.
The different outcomes in touching a faulty 120-V light fixture and a high-voltage Van de Graaff generator have to do with differences in
A) sustainability of charge flow. B) duration of charge flow. C) amount of energy transferred. D) all of the above E) none of the above
What is the change in area (in cm2) of a 60.0 cm by 150 cm automobile windshield when the temperature changes from 0° C to 36.0° C. The coefficient of linear expansion of this glass is 9.0 × 10^?6/°C
a. 1.6 b. 2.9 c. 3.2 d. 4.9 e. 5.8