A lens that is thicker at the center than the edges
a. is a converging lens.
b. is a diverging lens.
c. always forms a real image.
d. always forms a virtual image.
e. none of the above
a
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At what speed relative to the lab will a 0.272-kg object have the same momentum as a 1.30-kg object that is moving at 0.515c relative to the lab?
A) 0.944c B) 0.592c C) 0.981c D) 0.922c
The region around 2b has far fewer craters than the region around 2c) The crater floor at 2a is also flat and smooth, without many smaller craters on it. Why are regions 2a and 2b so smooth?
A) Few small craters ever formed in these regions. B) Erosion erased craters that once existed in these regions. C) Lava flows covered craters that once existed in these regions.
Why would a decrease in the density of the ozone layer create a public health concern?
a. The greenhouse effect would not be as efficient and the temperature of Earth would decrease. b. The greenhouse effect would be more efficient and the temperature of Earth would increase. c. Plant life would no longer have the ozone it needs for photosynthesis to create chlorophyll. d. Ultraviolet radiation from the Sun would bombard Earth. e. none of the above
What temperature is required to fuse hydrogen?
A) thousands of Kelvin B) millions of Kelvin C) billions of Kelvin D) trillions of Kelvin E) any temperature, as long as gravity is strong enough