Physics, 23.10.2019 23:00, kevinbazalar
What is minimum-energy configuration for a system of n equal point charges placed on or inside a circle of radius r? because the charge on a conductor goes to the surface, you might think the n charges would arrange themselves (uniformly) around the circumference. show (to the contrary) that for n=12 it is better to place 11 on the circumference and one at the center. how about for n=11 (is the energy lower if you put all 11 around the circumference, or if you put 10 on the circumference and one at the center)? [hint: do it numerically - you'll need atleast 4 significant digits. express all energies as multiples of q2/4πϵ0r
Answers: 3
Physics, 21.06.2019 15:10, tracijp
On a cold day, when the air temperature is 0°c, you empty your lungs and take a deep breath, filling your lungs with 4.2 l of air. if you hold your breath until the temperature of the air in your lungs reaches 37°c, what is the volume of the air in your lungs at that point, assuming the pressure does not change?
Answers: 1
Physics, 22.06.2019 10:40, rainbowboi
As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.
Answers: 1
Physics, 22.06.2019 14:20, mercymain1014
How many atoms of nitrogen are in the chemical formula ni(w on
Answers: 1
Physics, 22.06.2019 15:00, weridness80
For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat
Answers: 1
What is minimum-energy configuration for a system of n equal point charges placed on or inside a cir...
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