Homework Help for Physics

Using the law of conservation of energy derive the equationofmotion for the system below

A wire carries a current of I = 29 A along the
x-axis from x1 = −6.6 cm to x2 = 1.7 cm.
Find the magnitude of the resulting magnetic
field at the point r = 9.2 cm on the y axis.
Answer in units of μT

two positive charges, each ofwhich has a charge of 2.5 x 10^-9C,are located y=+0.50m andy=-0.50m. find the magnitude and directionof the resultantelectric force acting on a charge of 3.0 x 10^-9Clocated atx=0.70m.

(a) A 43 Ω resistoris connected in series with a 3 µF capacitor anda battery. What is themaximum charge to which this capacitor can becharged when thebattery voltage is 9 V? UsemicroC for µC.


(b) Initially the capacitor has zero charge. At what time duringthecharging process will the charge on this capacitorbe 17.1 µC?


(c) The capacitor is now fully charged. The battery is removedandthe capacitor is discharged through the resistor. What will bethecharge on the capacitor after 0.129ms?

So I consulted the solutions guide on problem 16, chpt. 20 and it didn't really answer my question. I'm trying to find the work done by/on the gas by the use of a P-V diagram only. a-b is a constant pressure case, so no problem there. b-c is constant volume. Alright, I can handle that too. But c-a? What about that? The solution neglected to mention its existence. It didn't make clear why the answer ignored this phase of the cycle. Why is it this way? Please explain.

Two loop wires are side by side as shown. The currentinI₁ in loop 1 is supplied by an external source,notshown, and is clockwise as viewed from the right.

While I₁ is increasing, what is the direction ofthemagnetic force exerted on loop 2, if any? Explain.

While I₁ is constant, does current flow in loop 2? Ifsodoes it flow clockwise or counter clockwise as viewed fromtheright? Explain.

When the current in loop 1 increases at a steady rate of 9.0A/s,the current in loop 2 is 0.185 mA. The resistance of loop 2 is0.66Ω. What is the direction of the current in loop 2 as viewedfromthe right? What is the mutual inductance of the two loops

I need help with this one. Ive tried 6.01x10-7 & 6.1 and theyrebothwrong....

A block of mass 3.00 kg is pushed against a wall by a force P that makes a 50.0 degree angle with the horizontal. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude of P that allow the block to remain stationary. (b) Describe what happens if absolute value of P has a larger value and what happens if it is smaller. (c) Repeat parts (a) and (b) assuming the force makes an angle of 13.0 degrees with the horizontal.