The actual question is:
A 17.00 Ω resistor is made from a coil of copper wire whose total mass is 37.0 g. The resistivity of Cu is 1.68×10-8 Ω · m and its mass density is 8.90×103 kg/m3. What is the diameter of the wire?
So would I use Ohm's law V=IR to find I?
Homework Statement
I have a question where I'm given the voltage, mass, resistivity, and density of a wire and I need to find the diameter and the length. Can someone show me how to do both of these?
Homework Equations
I have no idea what equation would relate voltage, mass...
Homework Statement
a) You wish to have a plane pocket mirror that is as discreet as possible but with which you can see the whole width of your face. If your face is 23.0 cm wide, what is the minimum width, in cm, of the mirror for you to be able to see the whole width of your face in one eye...
But I'm given that the wavelength of orange is 610 nm and the indices of refraction is n = 1.522 and the wavelength of violet is 410 nm and the indices of refraction is n = 1.538. So How do I set it up if I'm given all of this information?
Homework Statement
Sunlight strikes a piece of crown glass at an angle of incidence of 36.7 degrees. Calculate the difference in the angle of refraction between a orange (610. nm) and a violet (410. nm) ray within the glass. The indices of refraction for the orange and the violet are n = 1.522...
My computer asks exactly what I wrote before and it shows:
Determine a basis for the row space:
(___ ___ ___ ___), (___ ___ ___ ___)
Determine a basis for the column space:
___ ____
___ ____
___ ____
___ ____
determine a basis for the null space:
___ ____
___ ____
___...
I am asked to find the basis for the row space, which I said was:
(2,-2,-4,4), (-1,1,2,-2)
the column space, which I said was:
2 -2
-1 1
-1 0
-4 1
and the null space, which I said was:
-3 0
-5 -2
1 0
0 1
and my computer says that at least 1 thing is wrong, but...
Homework Statement
The matrix is:
-2 -2 -4 4
-1 1 2 -2
-1 0 -3 0
-4 1 -7 -2
I know the dimensions for the null space are 2
Homework Equations
I know that to find the basis for a null space Ax=0, so I row reduced it and I got
1 0 3 0
0 1 5 -2
0 0 0 0
0 0 0 0
The Attempt...
I don't have a scanner or anything. I guess no one can help me. I understand and have done everything you guys are saying, and I appreciate the help. I was just looking for a more direct approach to the problem instead of everyone telling me what I have already done.
Yes, I know that is why we use FBD, but in this case all I know is the mass and an angle. I don't really understand what I'm setting equal to each other.
The force of tension would point up because that's where the tension is coming from. (I think). I understand the point of FBD's, but if I don't know the values then how does it help, in this case?
In my FBD, I have gravity pointing down, the force of the ground pointing up, (the force of the ground and the force of gravity are equal), friction pointing to the left, and acceleration pointing to the right (acceleration is larger since the van has constant acceleration.
a= f/m, but I don't know what the force is
the mass is 65 kg so the force is 637.4 N so when I divide 637.4/65 I get 9.8 (gravity), but that really hasn't gotten me anywhere, has it?
I don't know the equation for tension. We haven't learned it yet but the assignment is due Monday.
A projectile is shot from the edge of a cliff 172.0 m above the ground level with an initial speed of 66.00 m/s at an angle of 68.00 ° with the horizontal.
What is the range X of the projectile as measured from the base of the cliff?
I would normally use a range equation, but I didn't...
A mass M = 65.00 kg is suspended by a massless string from the ceiling of a van which is moving with constant acceleration a. If the string makes an angle theta = 26.00 degrees with respect to the vertical:
a.what is the acceleration a of the van?
b.What is the tension in the string?
can...
A horizontal force, F, holds the ball steady. Given F = 9.00 N, and theta = 12.00 degrees, calculate the mass of the ball.
I honestly have no idea where to begin. Please help.