Physics, 25.12.2019 05:31 dwhitlock10
A2.5 kg , 20-cm-diameter turntable rotates at 80 rpm on frictionless bearings. two 500 g blocks fall from above, hit the turntable simultaneously at opposite ends of a diameter, and stick.
what is the turntable's angular speed, in rpm, just after this event?
Answers: 1
Physics, 22.06.2019 03:00
An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of where qin is the refrigerator cooling rate, qout is the heat rejection rate, and is the power input. show that copm can be expressed in terms of the reservoir temperatures tc and th, the cold and hot thermal resistances rt,c and rt,h, and qin, as where rtot rt,c rt,h. also, show that the power input may be expressed as 1.39 a household refrigerator operates with cold- and hot-temperature reservoirs of tc 5 c and th 25 c, respectively. when new, the cold and hot side resistances are rc,n 0.05 k/w and rh,n 0.04 k/w, respectively. over time, dust accumulates on the refrigeratorĆ¢ā¬ā¢s condenser coil, which is located behind the refrigerator, increasing the hot side resistance to rh,d 0.1 k/w. it is desired to have a refrigerator cooling rate of qin 750 w. using the results of problem 1.38, determine the modified coefficient of performance and the required power input w under (a) clean and (b) dusty coil conditions. internally reversible refrigerator qout qin w high-temperature reservoir low-temperature reservoir th th,i tc,i tc high-temperature side resistance low-temperature side resistance w qin th tc qinrtot tc qinrtot copm tc qinrtot th tc
Answers: 2
Physics, 22.06.2019 04:20
The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is
Answers: 1
Physics, 22.06.2019 16:30
In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendelās discoveries in genetics. over a century later, darwinās idea of evolution was modified in order to incorporate mendelās rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendelās rules of genetics and darwinās idea of biological evolution? a.)mendelās genetics states laws that are now part of the theory of biological evolution.b.)biological evolution states laws that are part of mendelās theory of genetics.c.)mendelās genetics replaced darwinās entire concept of biological evolution.d.)biological evolution is a law that explains why all genetics exist.
Answers: 1
Physics, 23.06.2019 01:30
Acyclotron is used to produce a beam of high-energy deuterons that then collide with a target to produce radioactive isotopes for a medical procedure. deuterons are nuclei of deuterium, an isotope of hydrogen, consisting of one neutron and one proton, with total mass 3.34Ć10ā27kg. the deuterons exit the cyclotron with a kinetic energy of 6.40 mev .a-what is the speed of the deuterons when they exit? b-if the magnetic field inside the cyclotron is 1.25 t, what is the diameter of the deuterons' largest orbit, just before they exit? c-if the beam current is 350 Ī¼a how many deuterons strike the target each second?
Answers: 3
A2.5 kg , 20-cm-diameter turntable rotates at 80 rpm on frictionless bearings. two 500 g blocks fall...
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