When starting from rest at the bottom of a straight road with constant upward slope, Joan bicycles to the top 50.0 s ahead of Sally, whose travel time is 5.00 minutes. What is the ratio of Joan's acceleration to Sally's acceleration?
a. 0.694
b. 0.833
c. 1.20
d. 1.44
e. 6.00
d
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Thin Lenses: Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A. The image is always real. B. The image is always virtual. C. The image is always inverted. D. The image is always upright. E. None of these choices are correct.
An unstable particle initially at rest breaks up into two fragments. The mass of one fragment is 1.75 × 10^–28 kg and the mass of the other fragment is 1.25 × 10^–27 kg. The lighter fragment has a speed of speed 0.850c. What is the speed of the heavier fragment?
a. 0.229c b. 0.119c c. 0.127c d. 0.220c
The Himalayan Mountains are rugged, jagged peaks and the Appalachians are smooth and rolling. Why is there a difference?
a. The Himalayas are much older and the rocks have begun breaking off. b. The Himalayas are volcanic mountains and the Appalachians are not. c. The Appalachians are much older and have been smoothed by erosion. d. The Appalachians are younger and just started to be thrust upward by plate tectonics. e. a and d
In the context of Earth's climate history, what do we mean by snowball Earth?
A) It refers to one or more deep ice ages that occurred hundreds of millions of years ago. B) This term is used to describe all the ice ages that have occurred in the past few million years. C) It refers to a time when polar regions had much more snowfall than normal. D) It is what we expect to see happen on Earth in about a billion years.