Phy
Most popular questions and responses by Phy
Physics
A point charge Q1=2 microcoulomb is located at x=0, and a point charge Q2=+8 microcoulomb, is placed at x=0.5 on the x axis of a cartesian coordinate system.The goal of this problem is to determine the electric field,at various points along the x axis.
asked on February 25, 2013 
Physics
A charge of q1=1×10−6 C is located at corner A of an equilateral triangle. A charge q2=4×10−6 C is located at corner B and a charge of q3=7×10−6 C is located at corner C. The distance AB=0.46 m (the other two sides of the triangle are the same).
asked on March 24, 2013 
Physics
A long coaxial cable consists of two concentric conductors. The inner conductor is a cylinder with radius R_1, and it carries a current I_0 uniformly distributed over its cross section. The outer conductor is a cylindrical shell with inner radius R_2 and
asked on April 5, 2013 
Physics
(a) In the diagram above the small semicircle in the wire above R_1 indicates that it is not in contact with the horizontal wire which it appears to intersect due to the 2dimensional projection. Additionally, the horizontal wire is continuous, not
asked on April 5, 2013 
Physics
A simple motor has N=250 turns of wire on a coil measuring 12 cm \times \, 4 cm. It's resistance is R=10 ohms. The magnetic field is B=1 T. (a) How much current (in Ampere) in the coil is needed to produce a maximum torque of 40 Nm? b) What maximum EMF (in
asked on April 6, 2013 
Phys
A car of mass 1200kg is moving on a road at the speed of 60km/hr.if coefficient of friction is 38, and Normal force is 50N. The frictional force acting on the car is given by
asked on November 8, 2017 
Thermodynamics
An insulated rigid tank contains 1.5 kg of helium at 30∘C and 500 kPa. A paddle wheel with a power rating of 0.1 kW is operated within the tank for 30 minutes. Cvof helium = 3.12 KJ/Kg.K Problem 7A. Calculate the net work done by helium, in kJ. Enter the
asked on October 17, 2014 
Physics
An electron is projected, with an initial speed of v= 2.18e+05 m/sec, directly towards a proton that is essentially at rest. If the electron is initially a great distance from the proton, at what distance from the proton is its speed instantaneously equal
asked on March 2, 2013 
Physics
An object of mass m=80 kg moves in one dimension subject to the potential energy U(x)=λ/4*(x2−a2)2+(b/2*x2) a) How many equilibrium points (stable and unstable ones) does this potential have? b) Find a stable equilibrium point x0 such that x0 is
asked on November 2, 2013 
Physics
A woman weighs Fg= 600 N when standing on a stationary scale. Now, the woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 7 m/s to 1 m/s in a time interval of 1 s.
asked on November 2, 2013 
PHYSICS
a car traveling at a constant velocity of 30 m/sec passes an intersection at time t=0 45 seconds later a second car passes the same intersection and its traveling in the same direction at a constant velocity of 55 m/sec. when does the second car overtake
asked on October 17, 2011 
Thermodynamics
Steam in a cylinderpiston arrangement expands from an initial condition of 5 bar, 80% dry to a final state of 2 bar, dry saturated steam. The initial volume of steam is 0.8 m3. The process of expansion can be represented by a straight line on the
asked on October 17, 2014 
Thermodynamics
Consider 2 kg of an ideal gas (R=300 J/(kg.K) and Cp=1000 J/(kgK)) contained in a piston cylinder arrangement. The cylinder has a small valve at the end opposite to the piston.The cylinder walls are not adiabatic and allow heat transfer. The initial
asked on October 17, 2014 
Physics
An airliner makes an emergency landing with its nose wheel locked in a position perpendicular to its normal rolling position. The forces acting to stop the airliner arise from friction due to the wheels and from the breaking effort of the engines in
asked on November 2, 2013 
Physics
A body of mass m= 1 kg is moving along the xaxis. Its potential energy is given by the function U(x)=2*(x^2−1)^2 Suppose the body starts with zero speed at x=1.5 m. What is its speed (in m/s) at x=0 m and at x=−1 m? v(x=0)= v(x=−1)=
asked on October 18, 2013 
MathsCalculus
If f(2)=1 and f(2+h)=(h+1)3, compute f′(2). If f(−1)=5 and f(−0.9)=5.2, estimate f′(−1). If the line y=−3x+2 is tangent to f(x) at x=−4, find f(−4). Your answer should be expressed as an integer. If the line y=x−1 is tangent to the graph
asked on September 10, 2013 
Physics
A spherical shell of radius R carries a uniform surface charge density (charge per unit area) \sigma. The center of the sphere is at the origin and the shell rotates with angular velocity \omega (in rad/sec) around the zaxis (z=0 at the origin). Seen from
asked on April 26, 2013 
Physics
A coil consists of N=10^5 turns of wire wrapped uniformly around a plastic torus. The inside radius of the torus is r0=0.15 m and the outer radius is r1=0.16 m. Thus, each winding has a diameter d=0.01 m. What is the selfinductance (in H) of this coil?
asked on April 14, 2013 
Physics
Consider the following circuit. We have R_1=7 Ohms, R_2=17 Ohms, R_3=11 Ohms, V=9 Volts, L=0.09 H. At t=0 the switch is closed. (a)Immediately after the switch is closed, what are currents I_1, I_2, I_3 ? I_1 (b)What are the three currents after the switch
asked on April 14, 2013 
Physics
Consider a capacitor made of two square plates of side 'l' . The distance between the two plates is 'd'. a) We insert a dielectric of dielectric constant K>1 and width l, a distance x (as in the diagram). What is the total capacitance of this arrangement?
asked on March 12, 2013 
Maths
Prove that the triangle formed by the points of contact of the sides of a given triangle with the excircles corresponding to those sides is equivalent to the triangle formed by the points of contact of the sides of the traingle with the inscribed circle
asked on March 7, 2013 
physics
Two conducting thin hollow cylinders are coaligned. The inner cylinder has a radius R1 , the outer has a radius R2 . Calculate the electric potential difference V(R2)−V(R1) between the two cylinders. The inner cylinder has a surface charge density of
asked on March 3, 2013 
Physics
A block of mass m=2 kg on a horizontal surface is connected to a spring connected to a wall (see figure). The spring has a spring constant k= 12 N/m. The static friction coefficient between the block and the surface is μs= 0.5 , and the kinetic friction
asked on November 2, 2013 
Physics
In the following circuit R_1=3 Ohm, R_2=10 Ohm, C=0.003 Farad, V=5 Volts. At time t =0 we connect the power supply to the circuit. At t=0 the capacitor is uncharged. (a) What is the time constant tau (in seconds) to charge up the capacitor? (b) What is the
asked on May 6, 2013 
Physics
The equation describing the (r, \theta ) coordinates of points along a single field line of a magnetic dipole is r=R_0 \sin ^2(\theta ) where \theta =0 is in the direction of the dipole moment and R_0 is a constant which is different for each field line.
asked on April 6, 2013 
physics
A current I travels counterclockwise through a closed copper wire loop which has the shape of a rectangle with sides 'a' and 'b'. What is the magnitude of the magnetic field at the center, C, of the rectangle? Express your answer in terms of a, b, I and mu
asked on March 30, 2013

PHYSICS
The pressure is 0.2526 atm
posted on January 11, 2014 
PHYSICS(HELP)
The pressure is 0.2526 atm
posted on January 11, 2014 
Classical Mechanics Physics  Urgent help please
Didn't get the solution for b) and c) of 1st problem, please help me
posted on December 9, 2013 
Classical Mechanics Physics  Urgent help please
BW please tell me solution for the 1st problem, my beta is 0.8 and mass is 3kg
posted on December 9, 2013 
Classical Mechanics Physics  Urgent help please
bw did u find f_y?
posted on December 9, 2013 
Classical Mechanics Physics  Urgent help please
Can someone please tell me the solution for b) part?
posted on December 9, 2013 
Classical Mechanics Physics  Urgent help please
I got c) part, the angle is 48.18 for all values
posted on December 9, 2013 
Classical Mechanics  Need Help Please
Please help me, my beta is 0.8 and mass is 3 kg, I got only the a) part correct, b) and c) are wrong :(
posted on December 9, 2013 
physics
How to calculate M initial and M final?
posted on December 8, 2013 
Physics
Yes, try it yourself, I got a green tick!
posted on November 4, 2013 
Physics
Yes yes, even I got the same result, but solved it a little differently
posted on November 4, 2013 
Physics
I think i have got how to work for t12, let me try first.
posted on November 4, 2013 
Physics
@ mouse, in the airliner's problem, what units do we have to keep? I converted kN to kg and tonnes to kg as well.
posted on November 4, 2013 
Physics
@ mouse, I read the airliner prob properly, I solved it but got it wrong. I am confused in the equations. Their equation is F(t)=F0+Bt , whereas ours is F(t)=F0+(t/ts1)*F1. What is B? I have only 1 try left now :(
posted on November 4, 2013 
Physics
Thanks a lot mouse, I could solve the pendulum problem. But, in the mass spring problem, I got x1=0.5714 , so mod(x2x1) should also be equal to x1, correct? But when i typed in the value, it showed that x1 was correct but mod(x2x1) was wrong :( Also, I
posted on November 3, 2013 
Physics
ss01, can you please tell me the solution for the airliner problem?
posted on November 3, 2013 
Physics
Thanks a lot mouse and KS, Did anyone get the airliner and the pendulum problem?
posted on November 3, 2013 
Physics
@ KS, can you please tell me how you got the solution for Double Well potential? I am not getting the value for k.
posted on November 3, 2013 
Physics
Please help me mouse
posted on November 3, 2013 
Physics
Thats what I am not getting! My x0 is 2, so F(x)= F0k(x2), when i type this in taylor series calculator of wolframalpha, i get a huge equation!
posted on November 3, 2013 
Physics
Yes i got x0, but i didn;t get k, can you please tell me how to calculate k for those values?
posted on November 3, 2013 
Physics
@ mouse, my x_0 is 2, lambda is 5, a=4, b=60 and mass is 80kgs. Please tell me the value of K, i tried to solve it by your method, but i got it wrong.
posted on November 3, 2013 
Physics(IMPORTANT)
ss01, can you please tell me a,b,c parts?
posted on November 3, 2013 
physics(help)
I didn't get the 2nd part, If I plug in 50*10*cos(30) , i get the answer wrong.
posted on November 3, 2013 
PHYSICS(HELP)
And also for sliding down the dome's 2nd part
posted on November 3, 2013 
PHYSICS(HELP)
I need help for airliner and double well potential ( K=? T=? )
posted on November 3, 2013 
Physics
I couldn't understand part c. In wolframalpha, what do we have to enter as the order of the taylor series and the point?
posted on November 3, 2013 
PHYSICS (HELP!!!)
What about the remaining parts??
posted on November 2, 2013 
PHYSICS(HELP)
Yes, this method is not working
posted on November 2, 2013 
PHYSICS(HELP)
What is the distance here?
posted on November 2, 2013 
physics (it's rather urgent help is appreciated
Thanks. Did you get Stone On Roof Find Distance problem?
posted on October 6, 2013 
physics (it's rather urgent help is appreciated
Can you tell me how to calculate distance of the particle to the origin at time, speed of the particle and the smaller angle? I got the acceleration. Thanks
posted on October 6, 2013 
physics (it's rather urgent help is appreciated
Well, I don't know how to differentiate, can you explain it to me.
posted on October 6, 2013 
physics (it's rather urgent help is appreciated
I didn't get you, can you explain it properly how to do the 1st problem
posted on October 6, 2013 
physics (it's rather urgent help is appreciated
kyle and ss01 can you please tell me how to solve the 1st problem?
posted on October 6, 2013 
physics (it's rather urgent help is appreciated
Even I wanted to know how to solve this problem. Can any one tell me how to solve the first problem of the exam? I got the answers of all problems except these 2.
posted on October 6, 2013 
MathsCalculus
Thanks, can you tell me the rest?
posted on September 11, 2013 
Physics
Q3, 3rd and 4th I=V/R
posted on June 16, 2013 
Physics
Thanks, can u tell me the solutions of 1,4,6,9,10,11,12?
posted on June 15, 2013 
Physics
P, these are the answers 1.2133e8 1.21845e7
posted on June 15, 2013 
Physics
No i didn't get them yet, I'll tell you when i get those, can u tell me the solutions of 1,4,6,9,10,11,12?
posted on June 15, 2013 
Physics
What is di/dt ??
posted on June 15, 2013 
Physics
B=n*E_0/c wavelength= 2*pi*c/(n*omega) Direction z and y
posted on June 15, 2013 
Physics
I got 4th problem
posted on June 15, 2013 
Physics
No, do you have any idea for others problems?
posted on June 15, 2013 
Physics
b) 0
posted on June 15, 2013 
Engineering
6_2A= t_0*x 6_2B= t_0*(x^2L^2)/(8*pi*G_0*R^4) 6_2C= L^2*t_0/(8*pi*G_0*R^4) 6_2D= 5*t_0*L/(4*pi*R^3) 6_3= 8*psi*G*I_o/(L^2) i need 6_1B
posted on June 11, 2013 
Physics/Mechanics
anyone got the 2nd answer???
posted on June 11, 2013 
physics please need help
Period (P) = 1/F
posted on June 1, 2013 
Physics
Do you know 1st c) and d) ?? And 3rd problem??
posted on May 25, 2013 
Physics
Yeah, only c) worked for me
posted on May 25, 2013 
Physics
Are these the formulas for 2nd problem?
posted on May 25, 2013 
Physics
Flu, U is the voltage of the battery
posted on May 25, 2013 
Physics
And Flu, from where did you find out the answers for 3rd prob?? My grader isn't accepting the the answer which u told, can u please tell me the formula, or from where u found out the answer?
posted on May 12, 2013 
Physics
And can anyone tell me the answer of 1st (g)??
posted on May 12, 2013 
Physics
1st prob c) 1.451e8 and 1.6711e8 d) 1.936e8 and 2.229e8 If you want answers of any other probs or formulas, please let me know
posted on May 12, 2013 
Physics
Thanks a lot Flu for the 4th prob 2nd prob a) Wavelength= 2*pi/k Frequency= omega/(2*pi)
posted on May 12, 2013 
Physics
What are the answers when t=2.2e16?? And do u have answers for the 4th question? Anonymous, I have the answers for the 1st and 2nd problems, can u tell me the specific questions for whom u want the answers
posted on May 12, 2013 
Physics
Any one for 2nd and 4th question all parts??
posted on May 4, 2013 
Physics
Thanks, and for the standing wave??
posted on May 4, 2013 
Physics
Standing Wave and Traveling Wave all parts please.
posted on May 4, 2013 
Physics
Standing Wave and Traveling Wave all parts please.
posted on May 4, 2013 
Physics
Yeah even i got it wrong, the formula itself is wrong
posted on April 28, 2013 
Physics
A=4*pi*r*r
posted on April 28, 2013 
Physics
Wrong formula!!!
posted on April 28, 2013 
Physics
That is a wrong formula, i m getting my answers wrong
posted on April 28, 2013 
Physics
How to calculate 'A'???
posted on April 28, 2013 
Physics
Thanks!! But how to calculate A in the first part??
posted on April 27, 2013 
Physics
a) (a) Calculate the magnitude of the total current (in A) carried by the rotating sphere for the following values of sigma,omega and R: sigma = 5 times 10^{4},C/m^2, omega = 4 rad/sec and R = 1 m b)(b) Calculate the magnitude of the magnetic field B(z)
posted on April 27, 2013 
physics
A) 2.40*1.50=3.6J b) 0.600*1.50=0.9 c) (1.50)cos90=0 d) same as c E) 3.60.9=2.7
posted on April 18, 2013 
Physics
I am not getting the answer by solving it. Can u please show the solution again?
posted on April 16, 2013 
Physics
Thanks
posted on April 6, 2013 
Physics
a) and c) are wrong
posted on April 6, 2013