Physics, 31.07.2019 14:30 datgamer13
Your boss asks you to design a room that can be as soundproof as possible and provides you with three samples of material. the only information on each sample's label is the material's coefficient of absorption. the coefficient of absorption listed on sample a is 30%, on sample b is 47%, and on sample c is 62%. when your boss asks for your choice and the reasoning behind it, what would you tell him? a. sample a would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest. b. sample a would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the largest. c. sample c would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the largest. d. sample c would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.
Answers: 1
Physics, 22.06.2019 10:30
Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.
Answers: 1
Physics, 22.06.2019 13:10
The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.
Answers: 3
Physics, 23.06.2019 00:30
Which of the following is a true statement about the acceleration ~a of the pendulum bob ~a is equal to the acceleration due to gravity. ~a is perpendicular to the bobโs trajectory. ~a is equal to the instantaneous rate of change in velocity. ~a is tangent to the bobโs trajectory.
Answers: 1
Your boss asks you to design a room that can be as soundproof as possible and provides you with thre...
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