Mechanics | Relativity Answers

A moving particle encounters an external electric field that decreases its kinetic energy from 9330 eV to 7410 eV as the particle moves from position A to position B. The electric potential at A is -45.0 V, and that at B is +17.0 V.

Determine the charge of the particle.

Include the algebraic sign (+ or -) with your answer.

Because of these charges, a potential difference of about 0.077 V exists across the membrane. The thickness of the membrane is 7.3 x 10^-9 m. What is the magnitude of the electric field in the membrane?

The electric potential energy stored in the capacitor of a defibrillator is 100 J, and the capacitance is 170 μF. What is the potential difference across the capacitor plates?

The electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of an 710-μF capacitor is 370 V. (a) Determine the energy that is used to produce the flash in this unit. (b) Assuming that the flash lasts for 6.6 ms, find the effective power or "wattage" of the flash.

The membrane that surrounds a certain type of living cell has a surface area of 5.3 x 10^-9 m2 and a thickness of 1.5 x 10^-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.3. (a) The potential on the outer surface of the membrane is +89.0 mV greater than that on the inside surface. How much charge resides on the outer surface? (b) If the charge in part (a) is due to K+ ions (charge +e), how many such ions are present on the outer surface?

Expain newton third law of motion.

What is ratio of De-broglie wavelegth of proton and electron at same kinetic energy.

I drag a mass m=21 kg in a straight line, along a horizontal surface, a distance D=23 m . I drag it at constant speed v=0.90 m.s−1 in a straight line using a horizontal force. The coefficients of friction are \mu_{s} = 1.2μ
s
​
=1.2 and \mu_{k} = 1.1μ
k
​
=1.1. How much work do I do? W =W= _____ J

if a tube have filed with water to a height 5m.and suddenly air of specific density of 0.85started to flow over it with 50m/s.find the the new height of water in tube.