Placer mining involves to extract minerals.
A. Removing the top layer of earth.
B. Tunneling...
Physics, 06.10.2020 14:01 puchie1225
Placer mining involves to extract minerals.
A. Removing the top layer of earth.
B. Tunneling under the earth.
C. Dredging sediments from the water bottom.
D. None of the above
(It’s either C or D, but I don’t know which one)
Answers: 2
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Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?
Answers: 3
Physics, 22.06.2019 21:40, lottie2306
Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.
Answers: 3
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Answers: 2
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