Riding down a river in an old canoe, if the discharge of the river increases a little and the width and the depth of the river stay the same, the speed of the river will
A) decrease.
B) increase.
C) stay the same.
D) become unpredictable.
Answer: B
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If an object of mass 8 kg has an acceleration of 5 m/s2, what is the unbalanced force acting on it?
a. 40 N b. 1.6 N c. 0.63 N d. 13 N e. cannot be determined
The figure shows a distance versus time graph for an object
The acceleration of the moving object is a non-zero constant.
a.
True
b.
False
Dust and smoke blown up into the Earth's atmosphere from the massive impact of an asteroid 65 million years ago
A) removed most of the oxygen in the Earth's atmosphere by oxidation B) rapidly escaped into space, having very little effect on the Earth's climate C) blocked sunlight, causing global temperatures to fall on the Earth and subsequently shutting down photosynthesis for up to a year D) trapped heat in the Earth's atmosphere, causing global temperatures to rise
Consider the Sun and its largest planet Jupiter. Where on the line joining them is their center mass? Is it within or outside the Sun? (Sun-Jupiter avg distance 778.million km; Solar mass/Jupiter mass = 1.0 × 103; Solar diameter 1.4 million km)
What will be an ideal response?