Homework Statement
write two independent equations using kirchoff rule to describe the circuit.
Homework Equations
V=IR
Emf = IR
The Attempt at a Solution
The answer is
emf2 -I1R3-I2R2-I1R1 = 0
(ok i have questions here: why is it I1R1? shouldnt it be I4R1?)
and...
Homework Statement
A circuit with one 5V and 3 resistors in parallel. What is the voltage across one of the resistors?
Homework Equations
V=IR
The Attempt at a Solution
5/3 V??
or should i put
R1 = 5V/I -R2-R3 V
how do we get voltage across one of the resistors without...
Homework Statement
We know the magnitude of the electric field at a location on the x axis and at a location on the y axis, if we are far from the dipole.
(a) Find \DeltaV= V_p - V_a along a line perpendicular to the axis of a dipole. Do it two ways: from superposition of V due to the two...
Homework Statement
He2+
2 protons and 2 neutrons
Homework Equations
E = Kq/r^2
The Attempt at a Solution
to get q
do square the charges of the proton? or do I multipy it by 2
Unwinding Cylinder--Dynamics
Homework Statement
A cylinder with a moment of inertia I (about its axis of symmetry), mass m, and radius r has a massless string wrapped around it which is tied to the ceiling (Intro 1 figure) .
At time t=0 the cylinder is released from rest at height h...
Homework Statement
m_1, v_1f
m_2, v_2f
m_2 = m_1 = m
Homework Equations
KE = .5mv^2
W = F*d
spring: F= -kx
pot energy = PE = -.5kx^2
The Attempt at a Solution
A) K + U = .5m(v_1f)^2 + .5m(v_2f)^2 - .5kx^2
.5(.1kg)(v_1f)^2 + .5(.1kg)(v_2f)^2 -.5(100N/m)(.02m)^2
B) ...
Homework Statement
The Earth can be approximated as a sphere of uniform density, rotating on its axis once a day. The mass of the Earth is 5.97×10^24 kg, the radius of the Earth is 6.38×10^6 m, and the period of rotation for the Earth is 24.0 hrs.
What is the moment of inertia of the...
Homework Statement
Suppose you are standing on the center of a merry-go-round that is at rest. You are holding a spinning bicycle wheel over your head so that its rotation axis is pointing upward. The wheel is rotating counterclockwise when observed from above.
For this problem, neglect...
Homework Statement
There are two balls travelling and they collide. How do there momentum change.
What is the impulse done to ball B by ball A.
Homework Equations
delta momentum = 0
impulse = ?
The Attempt at a Solution
the first part
i think its C
becuz A is moving up...
Homework Statement
its asking me if if it is easier to use the mass units
Homework Equations
PART A
The Attempt at a Solution
its it easier to to use numbers given becuz
when add the numbers
(3.9) / ( 1 - 16 / (16+133) ) = 4.3 = kinetic energy needed for O ionize C
4.3 > 4...
Homework Statement
There are two balls with masses m_a and m_b connected by a string. m_b is moving at a velocity v upwards (perpendicular to the string) and it asks for the Tension (T) in the string.
Homework Equations
a=(v^2)/R
delta Energy of system = 0
T = m((u^2)/r)
u is...
Homework Statement
there is a block sliding down a big globe in Italy.
Homework Equations
uhh
The Attempt at a Solution
does the globe have its own gravity?
i'm thinking its A and C.
Homework Statement
The Radius of Mars is R_m
its mass is m
The radius of Mars (from the center to just above the atmosphere) is R_m and its mass is m. An object is launched from just above the atmosphere of mars.
A) what is the object's initial velocity if its final velocity is V_f
Homework...
Homework Statement
the force is given as F
the distance pushed is given as D
Homework Equations
W= F*d
F=ma
KE = 1/2 mv^2
The Attempt at a Solution
the blocks have the same kinetic energy
Homework Statement
the force is given as F
the distance pushed is given as D
Homework Equations
W= F*d
F=ma
KE = 1/2 mv^2
The Attempt at a Solution
the blocks have the same kinetic energy