Show that the average drag coefficient for flow of a fluid over a flat surface, defined as
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Which of the following is not a characteristic of clastic sedimentary rock?
A) They are composed of small pieces of weathered rock. B) They are classified by particle size. C) They are created by precipitation. D) They may contain organic matter.
A 3.0-kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The mass strikes the ground with a downward velocity of 25 m/s. Find the change in mechanical energy of the mass caused by air resistance between the point where it is dropped and the point where it strikes the ground.
A. ?0.46 kJ B. ?0.53 kJ C. ?0.61 kJ D. ?0.38 kJ E. ?0.81 kJ
A charge of 20 nC is distributed uniformly along the x axis from x = -2.0 m to x = +2.0 m. What is the electric potential (relative to zero at infinity) at the point x = 5.0 m on the x axis?
a. 57 V b. 48 V c. 38 V d. 67 V e. 100 V
Sound refraction can occur when the speed of sound
A) remains constant. B) changes. C) ranges below supersonic. D) none of the above