The image of the "infinitely-far-away" Sun produced by a converging lens appears
A) between the lens and the focal point.
B) at the focal point.
C) beyond the focal point.
Answer: B
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Terminal Voltage and Internal Resistance: A battery has an emf ? = 78.0 V and an internal resistance r = 4.0 ?, as shown in the figure. A current of 4.7 A is drawn from the battery when a resistor R is connected across the terminals a and b. The power dissipated by the resistor R is closest to
A. 280 W. B. 340 W. C. 320 W. D. 300 W. E. 370 W.
Pluto exerts a noticeable gravitational influence on Uranus
Indicate whether the statement is true or false
Compared to a type A0 star, a type A9 star is
A) bluer. B) more massive. C) cooler. D) hotter. E) more luminous.
An iceberg weighing 1,000 tons is floating in the North Atlantic. Consider the gravitational forces on the iceberg due to the Earth, the Moon, and the Sun. Put these gravitational forces in order of increasing magnitude
You do not need to do any calculations. Use reasoning, or simply guess.
1.Earth < Moon < Sun 2.Earth < Sun < Moon 3.Moon < Sun < Earth 4.Moon < Earth < Sun 5.Sun < Moon < Earth 6.Sun < Earth < Moon