A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. ?0.64 kJ
b. ?0.40 kJ
c. ?0.52 kJ
d. ?0.28 kJ
e. ?0.76 kJ
d
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Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10-9 kg
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A bare roof of a warmly heated home on a snowy day indicates
A) an unwanted flow of heat. B) good insulation. C) a change of phase. D) all of the above
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a. True b. False Indicate whether the statement is true or false
If a monkey floating in outer space throws his hat away, the hat and the monkey will both move
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