Most of the visible light from the Sun originates in the photosphere
a. True
b. False
Indicate whether the statement is true or false
True
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The Sun is roughly 6 trillion miles (1 light year) away from Earth.
a. true b. false
Nuclear fusion creates
A) radiant energy. B) thermal energy. C) both thermal and radiant energy. D) nuclear energy. E) all types of energy.
A 385-g tile hangs from one end of a string that goes over a pulley with a moment of inertia of and a radius of 15.0 cm. A mass of 710 g hangs from the other end of the string. When the tiles are released, the larger one accelerates downward while the lighter one accelerates upward. The pulley has no friction in its axle and turns without the string slipping. What is the tension in the string on the side of the 710-g tile?
A) 9.77 N B) 6.87 N C) 5.59 N D) 4.41 N E) 3.68 N
Three resistors, each with resistance R1, are in parallel in a circuit. They are replaced by one equivalent resistor, R. Compare this resistor to the first resistor of the initial circuit. Which of the following statements is true?
a. The current through R equals the current through R1. b. R is greater than R1. c. The power given off by R equals the power given off by R1. d. The voltage across R equals the voltage across R1.