# Phy

Most popular questions and responses by Phy
1. ## 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.

2. ## 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).

3. ## 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

4. ## Physics

(a) In the diagram above the small semi-circle 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 2-dimensional projection. Additionally, the horizontal wire is continuous, not

5. ## 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

6. ## 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

7. ## 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

8. ## 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

9. ## 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

10. ## 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.

11. ## 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

12. ## Thermodynamics

Steam in a cylinder-piston 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

13. ## 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

14. ## 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

15. ## Physics

A body of mass m= 1 kg is moving along the x-axis. 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)=

16. ## Maths-Calculus

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

17. ## 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 z-axis (z=0 at the origin). Seen from

18. ## 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 self-inductance (in H) of this coil?

19. ## 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

20. ## 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?

21. ## 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

22. ## physics

Two conducting thin hollow cylinders are co-aligned. 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

23. ## 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

24. ## 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

25. ## 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.

26. ## 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

1. ## PHYSICS

The pressure is 0.2526 atm

posted on January 11, 2014
2. ## PHYSICS(HELP)

The pressure is 0.2526 atm

posted on January 11, 2014
3. ## Classical Mechanics Physics - Urgent help please

posted on December 9, 2013
4. ## 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
5. ## Classical Mechanics Physics - Urgent help please

bw did u find f_y?

posted on December 9, 2013
6. ## Classical Mechanics Physics - Urgent help please

Can someone please tell me the solution for b) part?

posted on December 9, 2013
7. ## Classical Mechanics Physics - Urgent help please

I got c) part, the angle is 48.18 for all values

posted on December 9, 2013
8. ## 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
9. ## physics

How to calculate M initial and M final?

posted on December 8, 2013
10. ## Physics

Yes, try it yourself, I got a green tick!

posted on November 4, 2013
11. ## Physics

Yes yes, even I got the same result, but solved it a little differently

posted on November 4, 2013
12. ## Physics

I think i have got how to work for t12, let me try first.

posted on November 4, 2013
13. ## 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
14. ## 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/ts-1)*F1. What is B? I have only 1 try left now :(

posted on November 4, 2013
15. ## Physics

Thanks a lot mouse, I could solve the pendulum problem. But, in the mass spring problem, I got x1=0.5714 , so mod(x2-x1) should also be equal to x1, correct? But when i typed in the value, it showed that x1 was correct but mod(x2-x1) was wrong :( Also, I

posted on November 3, 2013
16. ## Physics

ss01, can you please tell me the solution for the airliner problem?

posted on November 3, 2013
17. ## Physics

Thanks a lot mouse and KS, Did anyone get the airliner and the pendulum problem?

posted on November 3, 2013
18. ## 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
19. ## Physics

posted on November 3, 2013
20. ## Physics

Thats what I am not getting! My x0 is 2, so F(x)= F0-k(x-2), when i type this in taylor series calculator of wolframalpha, i get a huge equation!

posted on November 3, 2013
21. ## 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
22. ## 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
23. ## Physics(IMPORTANT)

ss01, can you please tell me a,b,c parts?

posted on November 3, 2013
24. ## 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
25. ## PHYSICS(HELP)

And also for sliding down the dome's 2nd part

posted on November 3, 2013
26. ## PHYSICS(HELP)

I need help for airliner and double well potential ( K=? T=? )

posted on November 3, 2013
27. ## 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
28. ## PHYSICS (HELP!!!)

posted on November 2, 2013
29. ## PHYSICS(HELP)

Yes, this method is not working

posted on November 2, 2013
30. ## PHYSICS(HELP)

What is the distance here?

posted on November 2, 2013
31. ## physics (it's rather urgent help is appreciated

Thanks. Did you get Stone On Roof Find Distance problem?

posted on October 6, 2013
32. ## 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
33. ## 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
34. ## 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
35. ## 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
36. ## 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
37. ## Maths-Calculus

Thanks, can you tell me the rest?

posted on September 11, 2013
38. ## Physics

Q3, 3rd and 4th I=V/R

posted on June 16, 2013
39. ## Physics

Thanks, can u tell me the solutions of 1,4,6,9,10,11,12?

posted on June 15, 2013
40. ## Physics

P, these are the answers- 1.2133e-8 1.21845e-7

posted on June 15, 2013
41. ## 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
42. ## Physics

What is di/dt ??

posted on June 15, 2013
43. ## Physics

B=n*E_0/c wavelength= 2*pi*c/(n*omega) Direction -z and -y

posted on June 15, 2013
44. ## Physics

I got 4th problem

posted on June 15, 2013
45. ## Physics

No, do you have any idea for others problems?

posted on June 15, 2013
46. ## Physics

b) 0

posted on June 15, 2013
47. ## Engineering

6_2A= -t_0*x 6_2B= -t_0*(x^2-L^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
48. ## Physics/Mechanics

posted on June 11, 2013
49. ## physics please need help

Period (P) = 1/F

posted on June 1, 2013
50. ## Physics

Do you know 1st c) and d) ?? And 3rd problem??

posted on May 25, 2013
51. ## Physics

Yeah, only c) worked for me

posted on May 25, 2013
52. ## Physics

Are these the formulas for 2nd problem?

posted on May 25, 2013
53. ## Physics

Flu, U is the voltage of the battery

posted on May 25, 2013
54. ## 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
55. ## Physics

And can anyone tell me the answer of 1st (g)??

posted on May 12, 2013
56. ## 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
57. ## 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
58. ## Physics

What are the answers when t=2.2e-16?? 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
59. ## Physics

Any one for 2nd and 4th question all parts??

posted on May 4, 2013
60. ## Physics

Thanks, and for the standing wave??

posted on May 4, 2013
61. ## Physics

Standing Wave and Traveling Wave all parts please.

posted on May 4, 2013
62. ## Physics

Standing Wave and Traveling Wave all parts please.

posted on May 4, 2013
63. ## Physics

Yeah even i got it wrong, the formula itself is wrong

posted on April 28, 2013
64. ## Physics

A=4*pi*r*r

posted on April 28, 2013
65. ## Physics

Wrong formula!!!

posted on April 28, 2013
66. ## Physics

That is a wrong formula, i m getting my answers wrong

posted on April 28, 2013
67. ## Physics

How to calculate 'A'???

posted on April 28, 2013
68. ## Physics

Thanks!! But how to calculate A in the first part??

posted on April 27, 2013
69. ## 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
70. ## 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) 3.6-0.9=2.7

posted on April 18, 2013
71. ## Physics

I am not getting the answer by solving it. Can u please show the solution again?

posted on April 16, 2013
72. ## Physics

Thanks

posted on April 6, 2013
73. ## Physics

a) and c) are wrong

posted on April 6, 2013