You experience night-time when
A) the Moon blocks the Sun's light.
B) Earth is on the opposite side of the celestial sphere from the Sun.
C) you are located on the side of the Earth that faces away from the Sun.
D) you are located on the side of the Earth that faces toward stars.
C) you are located on the side of the Earth that faces away from the Sun.
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A charge of +3.0 ?C is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25?C from infinity to the center of the circle?
a. 5.4 J b. 3.4 J c. 4.3 J d. 2.7 J e. 6.8 J
The energy used by a 100 watt light bulb in 1 hour is __________
Fill in the blank(s) with correct word
Which of the following statements is true of a Doppler shift?
A) A light source approaching an observer will appear red. B) A light source moving away from an observer will appear blue. C) The shift in the velocity of the source is identified irrespective of its direction. D) The amount of change in wavelength depends on the speed of the source.
What does the CNO cycle and the hydrogen proton-proton cycle have in common? Choose the best answer to the question
A) They both trigger at the same temperature. B) They both are ways to fuse hydrogen nuclei to make helium. C) They are both cycles in star lives. D) They are both nuclear reactions; the CNO cycle makes carbon, nitrogen, and oxygen, and the proton cycle makes helium.