Charge q1 = -4.5 nC is located at the coordinate system origin, while charge q2 = 0.91 nC is located at (a, 0), where a = 1.1 m. The point P has coordinates (a, b), where b = 0.85 m. A third charge q3 = -1.5 nC will be placed later.

a) Find the electric potential VP at point P, in volts. Assume the potential is zero at infinity.

b) How much work W, in joules, would you have to do to bring the third charge, q3, from very far away to the point P?

c) What is the total potential energy U, in joules, of the final configuration of three charges?

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.