The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?
a. first
b. second
c. third
d. fourth
c
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Impulse: A 0.140 kg baseball is thrown horizontally with a velocity of 28.9 m/s. It is struck with a constant horizontal force that lasts for 1.85 ms, which results in a velocity of 37.0 m/s in the opposite direction. What was the magnitude of the horizontal force?
A. 0.613 kN B. 2.19 kN C. 2.80 kN D. 4.99 kN
One helpful development regarding the atmospheric ozone problem was the international agreement to
A) significantly reduce ozone production by year 2000. B) issue free sunglasses to everybody. C) significantly reduce CFC production by year 2000. D) reduce fossil fuel use by 50 percent by year 2000. E) produce more ozone and inject it into the stratosphere.
Two spheres are made of the same metal and have the same radius, but one is hollow and the other is solid. The spheres are taken through the same temperature increase. Which sphere expands more?
1.solid sphere 2.hollow sphere 3.They expand by the same amount. 4.not enough information to say
To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water?
A) 2.3 s B) 2.6 s C) 2.9 s D) 3.2 s E) 3.6 s