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April 20, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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/l​adder.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⁻&#​179; = - 532 N ( direction: from the wall)
Monday, November 11, 2013 at 4:00pm

physics
Energy = PE = PE₁₂+PE₁₃+PES​21;₄+PE₂₃+PE₂​324;+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•2ε​320;=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+p²-2p&​#8321;•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-physi​cs-i-classical-mechanics-fall-2010/two-d​imensional-rotational-motion/two-dimensi​onal-rotational-dynamics/MIT8_01SC_probl​ems21_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/xᦙ​3; 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&​#65533;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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