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April 20, 2014

April 20, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics please HELP**

A meteor is approaching. Assume that the meteor started very far away from the earth and just grazes the earth. You may ignore all other forces except gravitational force between earth and meteor. Assume that mass of the meteor is much smaller than mass of the earth. With ...
*Tuesday, November 12, 2013 at 6:46pm*

**Physics**

In a 1-dimensional problem, a single force acts on a 10 kg object and is given the equation F=ax+b where a=250 N/m, b=25 N, x is position of object. There is a force acting on the object while that object moves from x=0 to x=2 lasting 3 sec. 1) What is the work done by this ...
*Tuesday, November 12, 2013 at 6:05pm*

**physics **

A 62-kg woman is standing on a scale while riding in an elevator? As the elevator continues to move up, it has a constant velocity . what is the reading on the scale.?
*Tuesday, November 12, 2013 at 5:49pm*

**Physics Urgent please help**

Thank you Damon
*Tuesday, November 12, 2013 at 5:36pm*

**physics**

A 72.5 kg skier is going straight down a 31.1o slope. Each ski has a contact area with the snow of 0.137 m2. Calculate the pressure that the snow exerts on each ski.
*Tuesday, November 12, 2013 at 5:33pm*

**physics **

a 36 kg child slides down a slide at a height of 2.5 m at at velocity of 3 m/s. how much energy was transferred by friction as she slid down the slide?
*Tuesday, November 12, 2013 at 5:27pm*

**Physics Important please**

A yo-yo of mass m rests on the floor (the static friction coefficient with the floor is mu ). The inner (shaded) portion of the yo-yo has a radius R-1 , the two outer disks have radii R-2 . A string is wrapped around the inner part. Someone pulls on the string at an angle Beta...
*Tuesday, November 12, 2013 at 4:35pm*

**Physics**

Gravity on the surface of the moon is only 1/6 as strong as gravity on the Earth. What is the weight of a 24 kg object on the Earth? The acceleration of gravity is 10m/s2 .
*Tuesday, November 12, 2013 at 4:31pm*

**Physics Classical Mechanics**

This is part of an 8.01x problem. Answers should not be given untill the deadline!! Cheaters will be banned from 8.01x!
*Tuesday, November 12, 2013 at 4:08pm*

**physics**

0.6
*Tuesday, November 12, 2013 at 3:49pm*

**physics**

An archer standing a horizontal distance d=50m away from a tree sees an apple hanging from the tree at h=12m above the ground. The archer chooses an arrow and prepares to shoot. The arrow is initially 1.5m above the ground. Just as the archer shoots the arrow with a speed of ...
*Tuesday, November 12, 2013 at 3:09pm*

**physics Important please**

q=It=Ut/R
*Tuesday, November 12, 2013 at 3:06pm*

**physics Important please**

R₀=8 Ω, T₀=20℃, R₁=8.4 Ω, T₁=70℃, T₂ = - 10℃ R₂=? R=R₀[1-αΔT] R₁=R₀[1-αΔT₁] 8.4=8[1+(70-20)α] α={8.4/8 – 1)/50 = 10⁻³ K⁻¹ R&#...
*Tuesday, November 12, 2013 at 3:04pm*

**physics**

a=(V^2-Vo^2)/2d=(0-90^2)/1.2m=-6750m/s^2 F = m*a = 0.04 * -6750 = -270 N.
*Tuesday, November 12, 2013 at 2:47pm*

**PHYSICS (HELP)**

power is KE=Iù²/2 = 9000•0.8²/2 = 2880 J. (Whitout the children)
*Tuesday, November 12, 2013 at 1:49pm*

**physics Important please**

A metal wire has a resistance of 8.00Ω at a temperature of 20C. If the same wire has a resistance of 8.40Ω at 70C, what is the resistance of this wire in ohms when its temperature is −10C?
*Tuesday, November 12, 2013 at 1:43pm*

**physics Important please**

A metal wire has a resistance of 8.00Ω at a temperature of 20C. If the same wire has a resistance of 8.40Ω at 70C, what is the resistance of this wire in ohms when its temperature is −10C?
*Tuesday, November 12, 2013 at 1:42pm*

**physics Important please**

A potential difference of 12.0V is maintained across an electrical device with a resistance of 10.0Ω. What total charge passes through a cross section of wire attached to this device over a period of 4.00s?
*Tuesday, November 12, 2013 at 1:39pm*

**PHYSICS (HELP)**

The power is wrong
*Tuesday, November 12, 2013 at 1:15pm*

**Physics Classical Mechanics**

b) is a wrong ansfer!!
*Tuesday, November 12, 2013 at 11:16am*

**Physics**

laf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible friction between his feet and the ice. A friend throws Olaf a ball of mass 0.400kg that is traveling horizontally at 11.5m/s . Olaf's mass is 65.2kg. If...
*Tuesday, November 12, 2013 at 9:46am*

**Physics**

net acceleration mv^2/r tension= mv^2/r-mg b. at the bootom, mv^2/r+mg
*Tuesday, November 12, 2013 at 9:25am*

**Physics**

A machine swings a mass of 1kg connected to a massless rope in a vertical circle so that the speed of them mass is constant at 8 m/s. The rope is 1.0 m long, and the center of the circle is fixed at all times. a) Find the acceleration of the mass with magnitude and direction ...
*Tuesday, November 12, 2013 at 8:21am*

**Physics Urgent please help**

I omega, angular momentum, does not change so: I1 omega1 = I2 omega2 I1 omega1 = (3/4) I1 omega2 so omega2 = omega 1 * 4/3 then original ke = (1/2) I1 omega1&2 final Ke = (1/2) I2 omega2^2 so final Ke=(1/2)(3/4)I1 *(4/3)^2 omega1^2 = 4/3 of original (she had to do work to pull...
*Tuesday, November 12, 2013 at 8:14am*

**Physics**

Massless ropes A, B, C are connected together as shown and support a mass of 100 kg. Rope A is horizontal and ties to the wall, rope b is tied to the ceiling and rope c is vertical. What are the tensions in the ropes.
*Tuesday, November 12, 2013 at 7:49am*

**physics**

when 1240 J of heat are added to one mole of an ideal monatomic gas its temperature increases from 273K to 277K. Find the work done by the gas during the process.
*Tuesday, November 12, 2013 at 7:39am*

**physics**

when 1240 J of heat are added to one mole of an ideal monatomic gas its temperature increases from 273K to 277K. Find the work done by the gas during the process.
*Tuesday, November 12, 2013 at 6:55am*

**Physics Urgent please help**

4/3
*Tuesday, November 12, 2013 at 5:11am*

**Physics please HELP**

Thanx 2) 9.22e-24 11)The flux reverses sign and remains the same in magnitude
*Tuesday, November 12, 2013 at 4:38am*

**Physics please HELP**

2)9.2308e-24 11)option3
*Tuesday, November 12, 2013 at 4:34am*

**Physics I**

kos emkom
*Tuesday, November 12, 2013 at 4:21am*

**physics**

KE=W(resistive force) mv²/2 = Fs F= mv²/2s
*Tuesday, November 12, 2013 at 3:55am*

**physics**

a bullet of mass 0.04kg moving with a speed of 90m/s enter a heavy wooden block is stopped after a distance of 60cm.What is the avg resistive force exertes by the block or the bullet
*Tuesday, November 12, 2013 at 2:00am*

**physics**

a bullet of mass 0.04kg moving with a speed of 90m/s enter a heavy wooden block is stopped after a distance of 60cm.What is the avg resistive force exertes by the block or the bullet
*Tuesday, November 12, 2013 at 2:00am*

**Physics**

A coin rests 18.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.390. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.850 rad/s2. (b) At what angular speed (ω...
*Tuesday, November 12, 2013 at 1:49am*

**Physics Urgent please help**

A figure skater stands on one spot on the ice(assumed frictionless) and spins around with her arms extended. When she pulls in her arms, her moment of inertia decreases to 3/4 of the initial value. Assume that her spin angular momentum is conserved. What is the ratio of her ...
*Monday, November 11, 2013 at 11:22pm*

**Physics Important please**

Its not ok. If x=1cm, the e- have a net force to the rigth x=-3cm
*Monday, November 11, 2013 at 10:55pm*

**Physics**

A test tube in a centrifuge is pivoted so that it swings out horizontally as the machine builds up speed. If the bottom of the tube is 165.0 mm from the central spin axis, and if the machine hits 53500 rev/min, what would be the centripetal force exerted on a giant amoeba of ...
*Monday, November 11, 2013 at 10:38pm*

**Physics please HELP**

What is the ratio of the spin angular momentum of the Earth and its orbital angular momentum about the Sun. The mean radius of the earth is R_earth = 6400 km. The radius of the Earth's orbit is r_s = 1.5 * 10^8 km. For simplicity you may assume that the mass of the Earth ...
*Monday, November 11, 2013 at 10:38pm*

**physics**

A bicyclist traveling at 8 m/s rides around an unbanked curve. The coefficient of friction (is this static or kinetic friction?) between the tires and the road is 0.42. What is the radius of the shortest turn that the bicyclist can safely make?
*Monday, November 11, 2013 at 10:36pm*

**physics**

A 0.0309-kilogram ball is stuffed into a spring gun and shot up into the air at some angle. The gun's spring has a force constant of 92.5 N/m and is initially compressed 0.138 m. When the ball reaches maximum height, it has a horizontal velocity with a speed of 2.23 m/s. ...
*Monday, November 11, 2013 at 9:41pm*

**physics**

Light falls on a double slit with slit separation of 2.45×10^−6m, and the first bright fringe is seen at an angle of 13.8◦ relative to the central maximum. What is the wavelength of the light?
*Monday, November 11, 2013 at 9:00pm*

**PHYSICS**

A five turn square loop (10 cm on an edge and resistance = 4.0 ohms) is placed in a magnetic field that makes an angle of 30 degrees with the plane of the loop. The magnitude of this field varies with the time according to B = 0.50 t^2, where t is measured in seconds and B in ...
*Monday, November 11, 2013 at 8:49pm*

**Physics (Please Help)**

http://idol.union.edu/vineyarm/teaching/phy17/uncertainties_intro.pdf start with cosTheta uncertainity is diff between Cos(23.5)and cos(.5)= .5sin23.5=.199 now it is squared, so double it. error is appx 0.4 now in the expression, it is multiplied by 4d, so add the error...
*Monday, November 11, 2013 at 8:19pm*

**physics**

no
*Monday, November 11, 2013 at 7:32pm*

**Physics**

The Achilles tendon, which connects the calf muscles to the heel, is the thickest and strongest tendon in the body. In extreme activities, such as sprinting, it can be subjected to forces as high as 13 times a person’s weight. According to one set of experiments, the ...
*Monday, November 11, 2013 at 7:21pm*

**Physics (Please Help)**

d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. Z = 4d1 (cos (0))^ 2
*Monday, November 11, 2013 at 7:17pm*

**Physics (Please Help)**

d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. d1 (tan (0))
*Monday, November 11, 2013 at 7:16pm*

**Physics**

d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. a = 4 v1^2 / d2
*Monday, November 11, 2013 at 7:15pm*

**Physics Classical Mechanics**

R=2 m, Ic=9000 kg•m², r₀=1.2 m, m=20 kg, F=200 N, Δt=18 s. I=Ic+2I₀=Ic+2m r₀² = =9000+2•20•1.2²=9057.6 kg•m². M=Iα α=M/I=FR/I =200•2/9057.6 = 0.044 rad/s² ω=α•Δt =0.044•...
*Monday, November 11, 2013 at 6:17pm*

**PHYSICS**

q7, the answer is a)2*pi*sqrt(((1/3*m+m)*l^2+1/2*m*R^2)/((1/2*m+m)*g*l)) b)2*pi*sqrt(((1/3*m+m)*l^2)/((1/2*m+m)*g*l)) 4a: (m_2*g)/(m_2+I_c/R^2) b: (I_c*m_2*g)/(m_2*R^2+I_c) c: sqrt((2*h*m_2*g*R^2)/(m_2*R^2+I_c))
*Monday, November 11, 2013 at 6:06pm*

**physics**

Fr = 283N.[41o] + 283N.[0o] X = 283*cos41 + 283 = 496.6 N. Y = 283*sin41 = 185.7 N. Fr^2 = X^2 + Y^2 Fr^2 = 496.6^2+185.7^2 = 281,096.05 Fr = 530.2 N. Ff = u*mg = 0.283 * 264.6 = 74.9 N. a = (Fr-Ff)/m=(530.2-74.9)/27=16.9 m/s^2
*Monday, November 11, 2013 at 5:56pm*

**physics**

i dont know
*Monday, November 11, 2013 at 4:55pm*

**Physics falling ladder**

http://www.mathematische-basteleien.de/ladder.htm
*Monday, November 11, 2013 at 4:05pm*

**physics**

F=ma=mΔv/Δt=m[v₂-v₁;]/Δt= =0.38•[-1.9-2.3]/3•10⁻³ = - 532 N ( direction: from the wall)
*Monday, November 11, 2013 at 4:00pm*

**physics**

Energy = PE = PE₁₂+PE₁₃+PES21;₄+PE₂₃+PE₂324;+PE₃₄= =kq₁q₂/a +kq₁q₃/a+kq₁q₄/a+ kq₂q₃/a+kq₂q₄/a +kq₃q₄/a . Since q₁...
*Monday, November 11, 2013 at 3:52pm*

**Physics please HELP**

KE=Iω²/2 =I•4π²/2T² T=2 π•sqrt{I/2•KE} If KE↓ => T↑
*Monday, November 11, 2013 at 3:41pm*

**physics**

mv²/R =mg v=sqrt(gR)
*Monday, November 11, 2013 at 3:41pm*

**PHYSICS**

.146 meters
*Monday, November 11, 2013 at 3:41pm*

**physics**

Lifted weight= Bouyant force g*[(He density)*V+650+4600]=Air density *V*g g= gravity= 9.8 N/Kg Air Density= 1.29 Kg/m^3 He Density= 0.179 Kg/ m^3 Ballon Voulme= Gas Volume= Air volume approximately Solving the equation V= 4227 m^3
*Monday, November 11, 2013 at 3:36pm*

**Physics**

do=15.1 cm, R=8.55 cm, H= 6.7 cm di= ? h=? 1/do – 1/di = -2/R 1/di = 1/do+2/R = 1/15.1 +2/8.55. di= 3.33 cm The virtual image is smaller and closer to the mirror than the object h/di =H/do => h=H•di/do = 6.7•3.33/15.1 =1.48 cm
*Monday, November 11, 2013 at 3:36pm*

**Physics**

1/q + 1/p = 1/f f=r/2 p=15.1 f= 8.55/2= 4.275 1/q= 1/f+1/p= 1/4.275 + 1/15.1 = 19.375/64.5525 take inverse to get q q= 3.33
*Monday, November 11, 2013 at 3:25pm*

**Physics please HELP**

1- 19.2E-19 2-??? 3-1 4-4.8E-5 5-3.84e-23 6-h-(2*ke*lambda*q)/(l*ks) 7-(E*q)/(m*g) 8-D 9-7e-6 10-3.6e7 11-??? 12-3rd option 13-54e9 14-408.5E-12 15-4.902E-9 16-2.451E-9 17-6000 18-96E-17 19-1053787047200878.1558726673984632 20-increase 21-stay the same 22-increase 23-increase ...
*Monday, November 11, 2013 at 3:21pm*

**Physics please HELP**

KE=Iω²/2 =I•4π²/2T² T=2 π•sqrt{I/2•KE} If KE↓ => T↑
*Monday, November 11, 2013 at 3:13pm*

**physics**

You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
*Monday, November 11, 2013 at 3:12pm*

**physics**

You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
*Monday, November 11, 2013 at 3:11pm*

**physics**

You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
*Monday, November 11, 2013 at 3:10pm*

**physics**

You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
*Monday, November 11, 2013 at 3:08pm*

**Physics**

An object 6.70 cm high is placed 15.1 cm in front of a convex mirror with radius of curvature of 8.55 cm. Where is the image formed?
*Monday, November 11, 2013 at 3:02pm*

**physics**

C=ε₀A/d C=q/U=> q=CU = ε₀AU/d E=σ/2ε₀ =q/A•2ε₀= = ε₀AU/d•A•2ε320;=U/d The same result may be obtained from E=-gradΔU => E=ΔU/Δx =U/d
*Monday, November 11, 2013 at 2:56pm*

**Physics please HELP**

Assume that the energy source of radiation of the Crab Nebula pulsar is tapped from its rotational kinetic energy. Does the period of the pulsar increase, decrease, or stay the same?
*Monday, November 11, 2013 at 2:49pm*

**physics**

A capacitor has circular plates of radius \(r = 12\,cm\) that are now a distance \(d = 0.2\,cm\) apart. If this particular capacitor is hooked up to a \(12\,V\) battery, what is the value of the Electric Field between the two plates in \(N/C\)?
*Monday, November 11, 2013 at 2:48pm*

**physics**

q₁ = 3 e, q₂ = 12e, q₃ = 5e The electric field at the midpoint is E= kq₂/(x/2)²- kq₁/(x/2)²= =k(12e-3e)/(x/2)² =k36e/x² (directed to the 3e charge) F= q₃E=k36e•5e/x²= =k•180e/x², where k =9•10&#...
*Monday, November 11, 2013 at 2:45pm*

**Physics Part 2**

m₁=m₂=m=0.17 kg, α=45° v=5.6 m/s, v₁=3.5 m/s, v₂=? vector p =vector p₁+vector p₂ p₂=sqrt{p₁²+p²-2p₁•p•cosα} = =m•sqrt{3.5²+5.6²-2•3.5•5.6•cos45&...
*Monday, November 11, 2013 at 2:44pm*

**physics**

q₁ = 3 e, q₂ = 12e, q₃ = 5e The electric field at the midpoint is E= kq₂/(x/2)²- kq₁/(x/2)²= =k(12e-3e)/(x/2)² =k36e/x² (directed to the 3e charge) F= q₃E=k36e•5e/x²= =k•180e/x², where k =9•10&#...
*Monday, November 11, 2013 at 2:31pm*

**physics**

q₁ = 3 e, q₂ = 12e, q₃ = 5e The electric field at the midpoint is E= kq₂/(x/2)²- kq₁/(x/2)²= =k(12e-3e)/(x/2)² =k36e/x² (directed to the 3e charge) F= q₃E=k36e•5e/x²= =k•180e/x², where k =9•10&#...
*Monday, November 11, 2013 at 2:30pm*

**PHYSICS(HELP)**

Prob # 7 ocw.mit.edu/courses/physics/8-01sc-physics-i-classical-mechanics-fall-2010/two-dimensional-rotational-motion/two-dimensional-rotational-dynamics/MIT8_01SC_problems21_soln.pdf
*Monday, November 11, 2013 at 2:03pm*

**Physics please HELP**

Assume that the energy source of radiation of the Crab Nebula pulsar is tapped from its rotational kinetic energy. Does the period of the pulsar increase, decrease, or stay the same?
*Monday, November 11, 2013 at 1:03pm*

**Physics**

d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. Z = 4d1 (cos (0))^ 2
*Monday, November 11, 2013 at 12:45pm*

**Physics**

d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. d1 (tan (0))
*Monday, November 11, 2013 at 12:45pm*

**physics**

Four charges are arranged at the corners of a regular tetrahedron (a pyramid with four sides that are identical equilateral triangles). The charges are 1 Coulomb each, and the sides of the tetrahedron are all 1 meter. How much energy in Joules is required to assemble this ...
*Monday, November 11, 2013 at 12:44pm*

**Physics**

d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. a = 4 v1^2 / d2
*Monday, November 11, 2013 at 12:44pm*

**Physics**

3.84e-23
*Monday, November 11, 2013 at 12:32pm*

**Physics question - Damon please help!!**

If the shot is fired as the monkey falls, fire exactly at the monkey because the bullet and the monkey will both accelerate down at g and meet. Dy/Dx = tan T Dy = Dx tan T It does not matter what Vo is as long as the bullet and monkey do not hit the ground before colliding. So...
*Monday, November 11, 2013 at 12:16pm*

**physics**

q*E=F
*Monday, November 11, 2013 at 11:15am*

**Physics**

If f(x1,x2) is a function of x1 and x2 which have independent uncertainties sigma1 and sigma2, then the uncertainty in f(x1,x2) is: sigmaf = sqrt[sigmaf1^2 +sigmaf2^2] where sigmaf1 and sigmaf2 are the contributions to the uncertainty in f coming from x1 and x2: sigmaf1 = f(x1...
*Monday, November 11, 2013 at 11:12am*

**Physics**

d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. 1. d3 = 4 (d1 + d2)
*Monday, November 11, 2013 at 10:51am*

**Physics Urgent please help**

3e and 12e charge have opposite force, so I conside 9e instead of 15e, why answer is 15e????? Answer is not correct , I think!
*Monday, November 11, 2013 at 10:40am*

**Physics Urgent please help**

hi Rickross, explain why 15e ?
*Monday, November 11, 2013 at 10:38am*

**PHYSICS(HELP)**

A uniform stick of mass m and length l is suspended horizontally with end B at the edge of a table as shown in the diagram, and the other end A is originally held by hand. The hand at A is suddenly released. At the instant immediately after the release: (a) What is the ...
*Monday, November 11, 2013 at 10:19am*

**Physics Urgent please help**

hai unrickross THX foR 5QUESTION I got green check !!!
*Monday, November 11, 2013 at 10:09am*

**Physics Urgent please help**

Oh God unrickross i made mistake on my sign but the last ans is correct so it would be Distance between charges is d=sqrt{3²+3²} =4.24 cm x=d/2 =4.24/2 =2.12 cm =0.0212 m E=kq₁/x²+kq₂/x² = =k12e/x²+k3e/x²=k15e/x²= =9•10⁹...
*Monday, November 11, 2013 at 10:08am*

**Physics Urgent please help**

what are the answers for q13-16?
*Monday, November 11, 2013 at 10:07am*

**Physics pls anyone can help me? its urgent**

what is k?
*Monday, November 11, 2013 at 10:00am*

**Physics Urgent please help**

3.84*10^-23, sorry type wrong sign
*Monday, November 11, 2013 at 9:35am*

**Physics Urgent please help**

rickross in your equation k12e/x�+k3e/x�=k9e/xᦙ3; but why you using K15e/x in final calculation?
*Monday, November 11, 2013 at 9:00am*

**Physics Urgent please help**

jasonhafner 4 days ago As stated in the first lecture, "e" is the elementary charge unit,and never means the electron charge. Professor's explaination confuse the 4th answer.
*Monday, November 11, 2013 at 8:50am*

**physics**

A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.38 kg. The ball approaches the cushion with a velocity of +2.30 m/s and rebounds with a velocity of -1.90 m/s. The ball remains in contact with the cushion for a ...
*Monday, November 11, 2013 at 8:50am*

**Physics Urgent please help**

Distance between charges is d=sqrt{32+32} =4.24 cm x=d/2 =4.24/2 =2.12 cm =0.0212 m E=kq₁/x2-kq₂/x2 = =k12e/x2-k3e/x2=k9e/x2= =9�10⁹�9�1.6�10⁻1⁹/0.02122= =2.9�10⁻⁵ N/C why this answer is wrong?
*Monday, November 11, 2013 at 8:41am*

**Physics Urgent please help**

rickross, I use your answer of 4th, 4.8*10^5, I multiplex 5*1.6*10^-19, I got a green check. (3.84*10^23). I read your caluation routie of 4th question, why K(12e+3e)/(r^2) is correct? If 3e charge were negative electron, the equation would correct, but i think 3e charge is ...
*Monday, November 11, 2013 at 8:35am*

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