Homework Statement
A toaster with a Nichrome heating element has a resistance of 70 ohms at 20oC and an initial current of 1.6 A. When the heating element reaches its final temperature, the current is 1.39 A. What is the final temperature of the heating element?
Homework Equations
V=IR...
Homework Statement
An electron, starting from rest, is accelerated by a uniform electric field of 4 104 N/C that extends over a distance of 7 cm. Find the speed of the electron after it leaves the region of uniform electric field.
Homework Equations
F=(q1q2)/r^2
and maybe the Work...
Thanks for your Input. Yes I realize it is one dimensional so hear is what I have so far:
(I will define 1 as the negative charge and 2 as the positive and e will be the electron)
F_1e=k*((-.5muC*e)/R_1e^2)
F_2e=k*((12muC*e)/R_2e^2)
to find equilibrium:
F_1e= F_2e
I am then left...
Homework Statement
A point charge of -0.5 C is located at the origin. A second point charge of 12 C is at x = 1 m, y = 0.5 m. Find the x and y coordinates of the position at which an electron would be in equilibrium.
Homework Equations
F=k*((q_1*q_2)/r^2)
The Attempt at a Solution...
Maybe my brain is physics fried haha But which Variables need to be negative and why? Is it both potentials? I thought the would have positive potential energy or is it the fact that it is in the negative direction? Oh boy I am going to fail haha
I am assuming that there is no kinetic in my final state because the rocket doesn't have enough velocity to escape according to sqrt(2GM/r) so then:
(GMm/r_final)=.5mv^2+GMm/r_initial
r=GMm/(.5mv^2+(GMm/r_initial))
r= 6.7E-11*7E22*10/(.5*10*500^2+((6.7E-11*7E22*10)/1.75E6))
r=1.672e6...