A centrifuge rotor (hollow disk) is rotating at 10,000 rpm is shut off and brought to rest by a constant frictional torque of 1.20 Nm. If the mass of the rotor is 4.37 kg and its radius of gyration is 0.0710 m, through how many revolutions will the rotor turn before coming to rest and how long will it take
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Physics, 22.06.2019 08:00
5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0Β°c and at the end it was 19.0Β°c. calculate the energy absorbed by the reaction.
Answers: 3
Physics, 22.06.2019 22:50
Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligibleβabout 1 2000 of the protonβs mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ionβs circular orbit?
Answers: 1
A centrifuge rotor (hollow disk) is rotating at 10,000 rpm is shut off and brought to rest by a cons...
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