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The figure shows three forces applied to a trunk that moves leftward by 3.44 m over a frictionless floor. The force magnitudes are
F1 = 4.94 N, F2 -8.81 N, and F3 - 2.72 N, and the indicated angle is 8 - 60° (a) During the displacement, what is the network done on
the trunk by the three applied forces, the gravitational force, and the normal force? (b) Is there a net transfer of energy to or from
the trunk? (c) Does the kinetic energy of the trunk increase or decrease?
(a) Number
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(c)
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There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

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