Physics, 25.02.2020 22:26, redrosesxx
A parallel plate capacitor is charged to a potential difference of 100 V and disconnected from the source. A slab of dielectric is then inserted between the plates. (a) Compared to the energy before the slab was inserted, the energy stored in the capacitor with the dielectric is introduced to the energy stored in the empty capacitor is U/U0 = k.
(b) Give a physical explanation for this increase in stored energy.
(c) What happens to the charge on the capacitor? Note: This situation is not the same as when the battery is removed from the circuit before the dielectric is introduced.
Answers: 3
Physics, 22.06.2019 10:00, ceasar6071
Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?
Answers: 1
Physics, 22.06.2019 11:20, cjd1214812148
The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)
Answers: 3
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