A component in an automobile 12-V electrical system has a resistance of 90 ?. How much current is in the component when in operation?
a. 100 A
b. 0.13 A
c. 7.5 A
d. 1100 A
b
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Momentum is conserved only when there is no friction
Indicate whether the statement is true or false
A small underwater pool light is 1.26 m below the surface of a swimming pool. What is the radius of the circle of light on the surface, from which light emerges from the water? (nwater = 1.333)
a. 0.77 m c. 1.13 m b. 0.57 m d. 1.43 m
Where would you see Polaris, the north star?
What will be an ideal response?
Which of the following statements is probably true about the very first stars in the universe?
A) They were made only from hydrogen and helium. B) They were made from pure energy. C) They were probably orbited only by terrestrial planets, but no jovian planets. D) They were made approximately of 98% hydrogen and helium, and 2% of heavier elements.