I have 2 questions regarding mirrors:
If you look at yourself in a shiny Christmas tree ball with a diameter of 9.0 cm when your face is 30.0 cm away from it, where is your image? Is it real or virtual? Is it upright or inverted?
I know the mirror equation is:
(1/object distance) +...
I have 2 questions:
What type and height of image would a rearview mirror produce of a car that was 1.3 m high and 15.0 m behind you, assuming the mirror's radius of curvature is 3.2 m?
I don't know what equation to use to solve the problem. I think it might be:
(1/object distance) +...
I need help solving these 2 proofs:
(sec^2x-1)/(sec^2x) = sin^2x
I am not sure what direction to go in. I know the top of the left side could be changed into:
tan^2x/sec^2x, but I don't know what to do after that.
The second one I need help with is:
cos^2x/(1+tan^2x) = cot^2x
I...
So for the second one:
tan^2 x - sin^2 x = (tan^2 x)(sin^2 x)
(sin^2 x/cos^2 x) - sin^2 X = (sin^2 x/cos^2 x)(sin^2x)
So on both sides so the sin^2 x cancel, leaving it like:
cos^2 x = cos^2 x?
And for the first one:
tan x + cot x = (sec x)(csc x)
I changed it to:
sin...
I need help solving 2 proofs:
tan x + cot x = (sec x)(csc x)
I changed the left side to:
tan x + 1/tan x = (sec x)(csc x)
then crossed out the tan:
1 = (sec x)(csc x), but I got stuck there.
The next one I had trouble with was:
tan^2 x - sin^2 x = (tan^2 x)(sin^2 x)
I saw...
How can you make a compass without using iron or other ferromagnetic material?
At first, I thought to use a needle, but I was told that that was steel, and therefore iron. Any ideas?
In class we made a beakman's electric motor using wire, a battery, and a magnet. I don't understand how the motor works though. Can someone explain it to me? I think it has something to do with the magnetic poles, but I am not sure. This site: fly.hiwaay.net/~palmer/motor.html has a diagram...
An electron starts from rest 72.5 cm from a fixed point charge with Q=-0.125µC. How fast will the electron be moving when it is very far away?
The answer the book says is 2.33 x 10^7 m/s, but I don't know how they got that answer.
The equation I think I need to use is V=k(Q/R)
So I...
I have to find the Requivalent and all of the currents and voltages in the circuit below.
l------------Resistor 1----l---------l
l l l
battery l l
l Resistor 2 Resistor 3...
Tomorrow I have to do a demo in physics regarding static electricity. I am going to rub a comb against the inside of my sweatshirt and then attract tissue paper to it. I don't understand how to explain why this happens.
Is the comb neutral at first, then when you rub it to the sweatshirt it...
A 60 kg bungee jumper jumps from a bridge. She is tied to a 12 m long bungee cord and falls a total of 31 m. Calculate the spring constant of the bungee cord and the maximum acceleration experienced by the jumper.
I don't even know where to start. Can you tell me which equations I would...