Homework Statement
A conducting bar slides down without friction on a pair of conducting rails separated by distance d. Connected to resistor R and there magnetic field B directed upward, perpendicular to the ground over the entire region through which the bar moves.
1) find the current
2)...
Homework Statement
Since i only know the field direction, increasing go into page. Why the answer is C?
Why the answer "a" ?
The R and r on the pic is respected to what?
Homework Equations
The Attempt at a Solution
Right hand rule : finger tip = current
Thumbs = force
Palm = B
Or...
Homework Statement
A point particle of mass m and charge q(>0) approaches to a point particle Q(>0) at a fixed position. When the distance between the two particles is L, the speed of the moving particle is v. The permittivity of the vacuum is denoted as Epsilon0. Find the minimum distance...
Homework Statement
1. Homework Statement [/B]
The displacement y of standing wave that is obtained by a superposition of waves :
Y1 = 3 sin (2##\pi##(0.5t - 0 25 x))
Y2 = 3 sin (2##\pi##(0.5t + 0 25 x))
Homework Equations
Formula for standing waves
Y = 2Asinkx coswt
The Attempt at a Solution...
Homework Statement
Let 3/2kT be the kinetic energy of ideal gas per molecules. T the absolute temperature and N the avogadro number. Answer the following questions :
1) when the volume doubled at constant temperature. How many times the kinetic energy per molecule become greater than before...
1. The problem statement, all variables and given/known data
Homework Equations
The Attempt at a Solution
B at rest. A moves 7m/s and bump into B. Object A is frictionless. Object B not, coeff of friction = 0.2.
g = 9.8 m/s2
After collision both objects moves together with speed 2 m/s to the...
Homework Statement
That is a speaker. Sound wave is sent out from spesker S into pipe of uniform thickness.
Piston P move to left
1st resonance at 0.045 m
2nd resonance at 0.151 m
Frequency of the sounx 1620 Hz
Piston is stopped at the position that 2nd resonance occur
Then, frequency...
Homework Statement
[/B]
There is lead XY shaped as straight wire. Next to it, circular lead with radius 0.10 m.
They are in the same plane.
XY to center of circle, O is 0.20 m.
Curent flowing through XY is 15.7 A
Homework Equations
The Attempt at a Solution
1) find magnetic field (B) at...
Homework Statement
##\sin a + \cos b## = ##\frac{-1}{2}##
##\cos a + \sin b## = ##\frac{\sqrt 3}{2}##
0 < a < ##\pi/2##
##\pi/2## < b < ##\pi##
a + b = ? By calculating sin (a+b)
Homework Equations
The Attempt at a Solution
I tried :
##\sin a + \cos b =...
Homework Statement
|a| = 2
|b| = ## \sqrt3##
|a - 2b| = 2
Angle between a and b
Homework Equations
The Attempt at a Solution
##\theta## is angle between a and b
So angle between a and -2b is 180-##\theta## [/B]
##|a-2b|^2## = |a|^2 + |2b|^2 -2|a||2b|cos(180-##\theta##)
##2^2## = 2^2 +...
Homework Statement
Homework Equations
The Attempt at a Solution
I often do circuit. But still there is always stuff i dont get..
I was asked to find
1) I1 I2 I3 immidiately after S closed
2) I1 I2 I3 after sufficient of time
3) I1 I2 I3 immidiately after S opened
Just give me clue please...
Homework Statement
Gravitational force exerted on mass m is GMm/r^2
2. Relevant equations
Orbital velocity at distance R from earth = ##\sqrt gR##
Escape velocity = ##\sqrt 2gR##
gR = GM/R
Fc = mV^2/R
F =m.a
The Attempt at a Solution
1) express acceleration of gravity in terms of G, M , and...
Homework Statement
Kinetic energy per mol is 3/2KT
Homework Equations
Q = nC##\Delta##T
U = Q + W
W = -P##\Delta##V
The Attempt at a Solution
1) internal energy = 3/2NKT
2) heat needed to increase temperature of 1 mol ideal gas by 1 degree at constant volume?
Since constant volume, W = 0
Q...
Homework Statement
|x-2| < a is a necessary condition for x^2 -3x -10 < 10 . What is the range value of a?
|x-2| < a is a sufficient condition for x^2 -3x -10 < 10. What is the range value of a?[/B]
The options are
a>= 4
a>=3
0<a<=2
0<a<=3
0<a<=5
The Attempt at a Solution
Range of x for x^2...
Homework Statement
each wire carrying 10 Amps
a = 0.3 meter
point o located in the center
Homework Equations
B = permeability constant * I / ( 2 ##\pi## r)
r = distance between O and the wire
r perpendicular to B and I
A = carrying current into the page
B and C = out of the pages
The...
Homework Statement
fig 1 : Area of each plate is S, separated by 2d, charge Q in the capacitors
fig 2 : uncharged conductors of area S, thickness d, inserted parallel between plates
What is the ratio of electrostatic energy in fig 2 to electrostatic energy in fig 1?
Homework Equations
Q =...
Homework Statement
C1 = 4 micro F
C2 = 8 mF
R1 = 4 ohm
R2 = 8 ohm
V = 12
Questions :
1) Find current I when S not closed
2) find Vb, when Vc is 0
3) find Vd, when Vc is 0
4) total charge move from B to D
Homework Equations
Vf - Vi = F.d/q
(not sure this below is useful equations)
I = E/Z
E...
Homework Statement
(Is the image read-able now? )
The fig 1 shows the relationship between voltage and current when voltage is applied to a certain light bulb.
Next, in fig 2, the bulb is connected in series with a 12-V battery and a 5 ohm resistor.
Question : what is the amount of power...
Homework Statement
Homework Equations
The Attempt at a Solution
I think the answer for number 1 , graph somewhat like this
I get trouble for 2, 3, etc
I (k) = ##\int_{-1}^{1} f(x) dx ##
f(x) = ## \mid x^2 - k^2 \mid##
2) k < 1
for negative side
##\int_{-1}^{-k} (x^2 - k^2) dx +...
Homework Statement
##\lim_{h \to 0} \frac{f(x - 2h) - f(x + h)}{g(x + 3h) - g(x-h)}##
While f(x) = cos x
g(x) = sin x
Homework Equations
The Attempt at a Solution
Using L Hopital i couldn't make it more simple.
I tried to divide it by cos and sin
Can you give me clue?
Homework Statement
Homework Equations
The Attempt at a Solution
When the circuit moves creates magnetic force that moves the some charges in the wire and that is a current.
That is what i thought.
F = Q.v B sin theta
B = ( permeability Of vacuum* I)/(2pi.r)
But how to find the I?
Thank...
1. The problem statement, all variables and given/known
Homework Equations
## \frac {PV1}{T1} = \frac {PV2}{T2} ##
The Attempt at a Solution
I find that v2 = 330/273 V1
But how can this related to the distance of P travel?
Also, as the A gas pressed to B, i think the B gas try to resist...
Homework Statement
Homework Equations
The Attempt at a Solution
I tried to find constant k
f = k ##\Delta##x
1/2 * 9,8 = k * 0,1
k = 49 N/m
is rubber string the same as spring?
Ep + EK at 0,1 meter = Ek + EP at 0,3 m
1/2 k x^2 + 0 = 1/2 k x^2 + 1/2 mv^2
v^2 = 2*49(0,08)
v = 7*0,4 = 2,8...
Homework Statement
Homework Equations
The Attempt at a Solution
what's the Fa and Fb?
my logic is
Fa = Wa - N = mg - ##\frac{N}{\cos \theta}##
so is Fb...
so the ratio is 1. But I know it's wrong. What will make the difference between Fa and Fb?
can anyone give a clue please?
Homework Statement
Homework Equations
f = Spring's constant * ##\Delta x##
Potential Energy = ##\frac{1}{2} kx^2##
The Attempt at a Solution
I try to find constant of the springs
Fabove + Fbelow - W = 0
k*(0,2 m) + k*(0,2m) - ##\frac{1}{2}## * 9,8 = 0
0,4k = 4,9
k = 12,25 N/m
can I use...
Homework Statement
find f(x) which satisfies f(x) = x + ##\frac{1}{\pi}## ##\int_{0}^{\pi} f(t) \sin^2{t} \ d(t)##
Homework Equations
The Attempt at a Solution
to solve f(x), I have to solve the integral which contains f(t). And f(t) is the f(x) with variable t? if yes, I will get integral...
Homework Statement
Pic A, what's the I2?
Pic B, what's the current across a-b ?
Homework Equations
V = I*R
Voltage in series is different, the current is the same
Current in parallel is different, the voltage is the same
The Attempt at a Solution
from Pic A, I found that I1 = 1A, I3 = 1A...