Physics, 12.12.2019 05:31 mariaaalopezz
Six new refrigerator prototypes are tested in the laboratory. for each refrigerator, the electrical power p needed for it to operate and the maximum heat energy that can be removed per second qc, max/δt from its interior are given.
part a
rank these refrigerators on the basis of their performance coefficient.
rank from largest to smallest. to rank items as equivalent, overlap them.
part b
thsee six refrigerators are placed in six identical sealed rooms. rank the refrigerators on the basis of the rate at which they raise the temperature of the room.
rank from largest to smallest. to rank items as equivalent, overlap them.
1) p= 750 w, qc, max/deltat= 1500 j/s
2) p= 400 w, qc, max/deltat= 1200 j/s
3) p= 500 w, qc, max/deltat= 2000 j/s
4) p= 250 w, qc, max/deltat= 1000 j/s
5) p= 500 w, qc, max/deltat= 1500 j/s
6) p= 1000 w, qc, max/deltat= 3000 j/s
Answers: 2
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Physics, 23.06.2019 00:00
You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?
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Six new refrigerator prototypes are tested in the laboratory. for each refrigerator, the electrical...
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