Wednesday

April 16, 2014

April 16, 2014

Number of results: 102

**phisics **

Isn't this a formula?
*Saturday, January 8, 2011 at 3:01pm by bobpursley*

**phisics**

676
*Wednesday, April 7, 2010 at 4:43pm by Bob*

**phisics**

vbgjn
*Thursday, September 6, 2012 at 2:47pm by dixck*

**Phisics**

P=Fv
*Wednesday, July 3, 2013 at 7:52pm by Elena*

**Phisics**

35hp
*Wednesday, July 3, 2013 at 7:52pm by Anonymous*

**phisics**

GPE=mgh
*Wednesday, April 7, 2010 at 4:43pm by bobpursley*

**phisics**

1. 8000 m/s^2 east
*Tuesday, February 15, 2011 at 6:19pm by Jun*

**phisics**

I bet it is 100j
*Thursday, March 14, 2013 at 8:12pm by bobpursley*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

it's wrong
*Wednesday, November 20, 2013 at 7:05am by Anonimus*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

please
*Sunday, January 12, 2014 at 9:24am by Hawk*

**phisics**

Use coulomb's law.
*Tuesday, July 24, 2012 at 6:54pm by bobpursley*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

3,42 joules
*Sunday, December 8, 2013 at 7:14am by Anonymous*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

42.32 pi/s
*Wednesday, November 20, 2013 at 7:05am by Anonymous*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

32 :3 dont worry
*Sunday, December 8, 2013 at 7:16am by Anonymous*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

so, what is the correct answer for c) ??? Please
*Sunday, January 12, 2014 at 9:24am by ans*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

the answer for c was posted by KS
*Sunday, January 12, 2014 at 9:24am by Hawk*

**phisics**

wouldn't it depend on the initial speed, and in what direction?
*Wednesday, April 7, 2010 at 4:38pm by bobpursley*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

@Greco b one more time
*Sunday, January 12, 2014 at 8:23am by Anonimus*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

t_1 = pi / (2*w) where w = sqrt((k+alpha*m*g)/m)
*Sunday, January 12, 2014 at 9:24am by Anonymous*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

But t is not..... t = 2*pi/w Anonymous, did you confirm your answer? And thanks for your help
*Sunday, January 12, 2014 at 9:24am by ans*

**phisics**

What,is,the,weight,of,150lb,person,in,newtons?,What,is,his,mass,in,kilograms?
*Saturday, January 19, 2008 at 10:32pm by melissa*

**phisics**

Mg =mv^2/r Repost if you need your work critiqued.
*Thursday, November 5, 2009 at 5:51am by bobpursley*

**phisics**

what is the heat capacity of a gold ring that has a mass of 5.00g?
*Wednesday, April 4, 2012 at 4:41am by miles*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

for part c the correct answer is the first option
*Sunday, January 12, 2014 at 9:24am by KS*

**Phisics**

What is the rms value of the sinusoid s(t)=Asin(2πf0t)
*Sunday, January 26, 2014 at 7:09pm by Rosita*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

haha it's fun really. Do u a stand-up showan?
*Sunday, January 12, 2014 at 9:24am by Anonimus*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

oh yes it can if you figure out how much is dissipated in frictional heat.
*Sunday, January 12, 2014 at 9:24am by Damon*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

a) 45+a/2=51 degrees b)(1−sin)*v0^2/(g*cos^2(á))
*Sunday, January 12, 2014 at 8:23am by Greco*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

Well, I don't know how to resolve the problem with μ(x)=αx. If somebody could help with some advise.
*Sunday, January 12, 2014 at 9:24am by NTEA*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

but friction is a non-conservative force, so conservation of energy cannot be applied
*Sunday, January 12, 2014 at 9:24am by Anonymous*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

I don't have part b) but hum....where do you take in consideration the friction force?
*Sunday, January 12, 2014 at 9:24am by Anonymous*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

Lordy me, and I did this one by mistake yesterday not knowing it was an 8:01 final question
*Sunday, January 12, 2014 at 8:23am by Damon*

**phisics**

figure the KE at the bottom, then set it equal to the change in PE at the top. 1/2 m v^2=mgh solve for h.
*Thursday, February 21, 2013 at 8:38pm by bobpursley*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

check on the my post here h t t p://w w w jiskha . com /display.cgi?id=1389359012
*Sunday, January 12, 2014 at 9:24am by C++MeetsJava*

**phisics**

what is the height of the ball if the bottom of the swing is zero, speed is 2.8m/sec, 9.81 acceleration of gravity
*Thursday, February 21, 2013 at 8:38pm by emily*

**phisics**

If You do 100 j of work to elevate a bucket of water,what is its gravitational potential energy relative to its starting position?
*Thursday, March 14, 2013 at 8:12pm by Tyler*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

for c) it depends on your value! if your spring and friction force are the same the block stays put, otherwise no!
*Sunday, January 12, 2014 at 9:24am by some0ne*

**phisics**

What is the gravitational potential energy of a 300.0 g coffee cup sitting on a table top 1.25 m above the floor?
*Wednesday, April 7, 2010 at 4:43pm by jamie*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

Hawk, c) The block will move back and reach a second stop somewhere between x=0 and x=x1. is WRONG
*Sunday, January 12, 2014 at 9:24am by Greco*

**phisics**

What is the total mechanical energy of a 20 kg owl flying at 5.0 m/s through the air at a height of 25 m above the ground?
*Wednesday, April 7, 2010 at 4:40pm by jamie*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

have a look here: physicsforums com/showthread.php?s=7ff50c016352c4bdec599201ad9df2cf&p=4628168#post4628168 I'm stuck with time too
*Sunday, January 12, 2014 at 9:24am by some0ne*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

I don't know b. For a) x=1.085 c) The block will move back and reach a second stop somewhere between x=0 and x=x1. are those correct???
*Sunday, January 12, 2014 at 9:24am by Hawk*

**Phisics**

A violin string vibrates at 298 Hz when unfingered. At what frequency will it vibrate if it is fingered one sixth of the way down from the end?
*Wednesday, November 27, 2013 at 1:39am by Dani*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

(v_0^2*(1-sin(alpha))/(g*cos^2(alpha))
*Sunday, January 12, 2014 at 8:23am by Greco*

**phisics**

just go online and find the relationship between lbs and newtons, lbs and mass.
*Saturday, January 19, 2008 at 10:32pm by Hannah*

**phisics**

If a person were 300 meters above ground and it took them 7.746 secounds to hit the ground, how fast were they traveling?
*Wednesday, April 7, 2010 at 4:38pm by jamie*

**Phisics**

An elastic cord vibrates with a frequency of 3.5Hz when a mass of 0.62kg is hung from it.What is its frequency if only 0.40kg hangs from it?
*Tuesday, November 26, 2013 at 11:23pm by Daniela*

**Phisics**

See my later response to the same question. Your subject is spelled physics. That would be a good place to start learning the subject.
*Saturday, June 25, 2011 at 2:33pm by drwls*

**phisics**

Two positive charges, each of magnitude 2 10-6 C, are located a distance of 17 cm from each other. (a) What is the magnitude of the force exerted on each charge?
*Tuesday, July 24, 2012 at 6:54pm by kelly*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

I advise you to learn about conservation of energy and integrals of F dot dX and put some time into solving this 8:01 final question yourself.
*Sunday, January 12, 2014 at 9:24am by Damon*

**phisics**

A person of mass 65 kg is ascending on an escalator at a constant velocity of 2.5 m/s [22°above the horizontal]. Why The magnitude of the net force acting on the person is 0 N
*Saturday, December 3, 2011 at 11:47am by oksana*

**Phisics**

A speed boat is required to move at a constant speed of 50 MPH. What is the power needed to overcome a resistive force of 1000 lbs from the water?
*Wednesday, July 3, 2013 at 7:52pm by James*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

for part b, I considered only the conservation of energy.I think that the friction is only for work-energy analysis. But I am not so sure???
*Sunday, January 12, 2014 at 9:24am by Hawk*

**phisics**

s = vot + 1/2 at^2 = 30t - 4.9t^2 solve for s = -10. t = 6.439s v = 30 - 9.8*6.439 = -33.1m/s Makes sense, since it will be going -30m/s as it starts into the hole.
*Thursday, August 30, 2012 at 11:47pm by Steve*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

sorry I told you wrong for c)... if friction and spring are the same, given friction static and kinetic coefficient is the same, it will move back
*Sunday, January 12, 2014 at 9:24am by some0ne*

**phisics**

KE= 1/2 m v^2 PE=mgh Total energy= KE + PE
*Wednesday, April 7, 2010 at 4:40pm by bobpursley*

**phisics**

A ball is thrown with a speed of 20 m/sec at an angle of 60 degrees below the horizontal from a bridge whisch is 30 m above the water. Where does the ball hit the water? How long is it in the air?
*Sunday, December 19, 2010 at 4:44pm by Elise*

**phisics**

46. Balance these equations: (a) ____Fe(s) + ____O2(g)h____ Fe2O3(s) (b) ____H2(g) + ____N2(g)h____NH3(g) (c) ____Cl2(g) + ____KBr(aq)h____Br2(l ) + ____KCl (aq) (d) ____CH4(g) + ____O2(g)h____CO2(g) + ____H2O(l )
*Sunday, June 2, 2013 at 10:50pm by jamya*

**Phisics**

A car moving at 62 mi/h can be brought to rest in 4.8 s. Assuming that the deceleration is uniform, how far will the car travel between the time the brakes are applied and the time the car stops?
*Sunday, September 18, 2011 at 7:02pm by Adnane*

**Phisics**

distance during reaction time: V*3 seconds distance during slowing= Vi^2/2a change Vi 93km/hr to m/s and add the distances.
*Sunday, September 4, 2011 at 2:45pm by bobpursley*

**Phisics**

Determine the stopping distances for a car with an initial speed of 93 km/h and human reaction time of 3.0 s for the following accelerations. (a) a = -4.0 m/s2 , but has changed from what was graded. m (b) a = -8.0 m/s2 but has changed from what was graded. m
*Sunday, September 4, 2011 at 2:45pm by Adnane*

**Phisics**

change mi/hr to m/s Vf=vi+at solve for a, then Vf^2=Vi^2+2ad solve for d
*Sunday, September 18, 2011 at 7:02pm by bobpursley*

**phisics**

Learn how to spell physics. I am reminded of the child who keep mispelling her last name. initial vertical speed: -20sin60 hf=hi+Viv*t-4.9t^2 0=30-20sin60 * t - 4.9t^2 solve for t. Notice you will have to use the quadratic equation. distance= 20cos60 *t
*Sunday, December 19, 2010 at 4:44pm by bobpursley*

**Phisics**

An object with mass 2.0kg is attached to a spring with spring stiffness constant 240N/m and is executing simple harmonic motion. When the object is 2.2Ã—10âˆ’2m from its equilibrium position, it is moving with a speed of 0.65m/s . Calculate the amplitude of the motion.
*Wednesday, November 27, 2013 at 12:17am by Dani*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

Indeed, period formula is 2pi/w but how much of the period you need? It depends on your data, if the block stay put at x1 you need only 1/4 of period, if the block comes back you need more
*Sunday, January 12, 2014 at 9:24am by some0ne*

**phisics**

A projectile is fired horizontally from a gun that is 45m above flat ground, emerging from the gun with speed 250m/s How long does the projectile remain in the air? At what horizontal distance from the firing point does it strike the ground?.What is the magnitude of the ...
*Monday, October 10, 2011 at 10:32pm by Shanice*

**phisics**

A puck of mass m = 1.5 kg slides in a circle of radius r = 20 cm on a frictionless table while attached to a hanging cylinder of mass M = 2.5 kg by a cord through a hole in the table. What is the speed of mass m that keeps the cylinder at rest?
*Thursday, November 5, 2009 at 5:51am by shosho*

**phisics**

a rock is tossed straight up with a speed of 30m/s. when it returns it falls into a hole 10m deep. what is the rocks velocity as it hits the bottom of the whole? how long would the rock in the air, form the instant it is released until it hits the bottom on the hole
*Thursday, August 30, 2012 at 11:47pm by nicolas*

**phisics**

An object is attached to the lower end of a 100-coil spring that is hanging from the ceiling. The spring stretches by 0.210 m. The spring is then cut into two identical springs of 50 coils each. As the drawing shows, each spring is attached between the ceiling and the object...
*Saturday, November 17, 2012 at 7:47pm by jim*

**phisics **

a) Find the inductance of an ideal solenoid with 300 turns, length 0.5m, and a circular cross section of radius 0.02m. b) A solenoid with = 1000, = 1.0 cm and = 50cm is concentric within a second coil of = 2000, = 2.0 cm, and = 50cm. Find the mutual inductance assuming free ...
*Saturday, January 8, 2011 at 3:01pm by fati*

**phisics**

A spelunker is surveying a cave. She follows a passage 150m straight west, then 270m in a direction 45^\circ east of south, and then 280 {\rm m} at 30^\circ east of north. After a fourth unmeasured displacement, she finds herself back where she started.Use a scale drawing to ...
*Saturday, January 19, 2013 at 9:56pm by epifanio*

**phisics**

a 20kg block is connested to a 30kg block by a string that passes over a frictionless pully. the 30kg block is connected to a spring that has niglible mass and a force constant of 250n/m.the 20kg block is pulled 20cm down the incline(40 degrees) and released from rest find the...
*Wednesday, April 7, 2010 at 5:24am by sello*

**phisics**

A Cessna aircraft has a lift-off speed of 120 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 265 m? Answer in units of m/s2 b) How long does it take the aircraft to become airborne? Answer in units of s
*Thursday, September 6, 2012 at 2:47pm by an*

**Phisics**

A simple pendulum consists of a light string 1.70 m long with a small 0.490 kg mass attached. The pendulum starts out at 45^\circ below the horizontal and is given an initial downward speed of 1.50 m/s. At the bottom of the arc, determine the centripetal acceleration of the ...
*Saturday, June 25, 2011 at 2:08pm by Luis*

**Phisics**

A simple pendulum consists of a light string 1.70 m long with a small 0.490 kg mass attached. The pendulum starts out at 45^\circ below the horizontal and is given an initial downward speed of 1.50 m/s. At the bottom of the arc, determine the centripetal acceleration of the ...
*Saturday, June 25, 2011 at 2:33pm by Luis*

**phisics**

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have masse
*Sunday, October 21, 2012 at 11:19pm by greg*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

I need to confirm my answer please: For a: First for the theorem W_E: The work is for the friction and for the spring (left side of the eq.) and the energy only for the potential(right side) I obtained: -ux^2/2 - kx^2/2 = -mgh then the x=1,.... For b: I analized the part x=0 ...
*Sunday, January 12, 2014 at 9:24am by Hawk*

**Phisics**

A rocket is launched at an angle of 59.0° above the horizontal with an initial speed of 103 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 31.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. (a) ...
*Wednesday, September 12, 2012 at 4:09pm by Kali*

**Phisics**

A ball is dropped from the initial height h1 above the concrete floor and rebounds to a height of equal to 67% of the initial height h1. What is the ratio of the speed of the ball right after the bounce to the speed of the ball just before the bounce? This ratio is called ...
*Thursday, October 6, 2011 at 6:04pm by Logan*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 4.0 m. Find ...
*Monday, January 6, 2014 at 3:11pm by Anonimus*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

I did it in this way: using the theorem W-E for the point x=0,x=x1: kx^2 /2 - mV^2 /2 = -αmgx^2 /2 algebra,resolving for V: V= x*sqrt((αmg + k)/m) We know that V = dx/dt so: dx/x = (sqrt((αmg + k)/m))dt ln x = (sqrt((αmg + k)/m))t reolving for t: t= ln (1....
*Sunday, January 12, 2014 at 9:24am by Hawk*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A gyroscope consists of a uniform disc of mass radius M= 1 kg and radius R= 0.3 m . The disc spins with an angular speed ω= 300 rad⋅s-1 as shown in the figure below. The gyroscope precesses, with its axle at an angle 30∘ below the horizontal. The gyroscope is ...
*Wednesday, November 20, 2013 at 7:05am by Anonimus*

**phisics**

(a) ΔKE=ΔPE KE(B)-KE( A)=PE(A)-PE(B) mv²/2 -0 =mgh(A)-mgh(B) v=sqrt{2g[h(A)-h(B)]} (b) KE1/KE2 = {m1•gh(A)-mgh(B)}/ {m2•gh(A)-mgh(B)} = =m1/m2
*Sunday, October 28, 2012 at 12:47am by Elena*

**Physics Gr11 Light Unit - Blind spot**

This may be wrong- i havent taken phisics yet, but it makes some sense- because a blind spot is relativelly small it would be difficult to completely lose sight of an object because of the size difference, and also a persons eyes are constantly moving. For number two i would ...
*Tuesday, November 10, 2009 at 8:22pm by Rain*

**phisics**

the instant before a batter hits a 0.14 kilogram baseball, the velocity of the ball is 45 m/s west. the instant after the batter hits the ball, the ball's velocity is 35 m/s. The bat and ball are in contact for 1.0*10^-2. 1. determine the magnitude and direction of the average...
*Tuesday, February 15, 2011 at 6:19pm by lisbeth*

**phisics**

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have ...
*Sunday, October 28, 2012 at 12:47am by greg*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

I used the W-E theorem too,basically: -> Potential Energy became Kinetic Energy at the end of the track -> in the collision no energy is lost as it is stated by the problem, so -> it is KE = Work F_spring + Work F_friction -> they both change with x so i took the ...
*Sunday, January 12, 2014 at 9:24am by some0ne*

**phisics**

To keep the cylinder in equilibrium both side must be equal. (m1)*(v^2/r)=(m2)*g Left side=Right side (v^2/r) = (m2)*g / m1 isolate “v” on the left… v^2 = (m12)*g*r/m1 v = sqrt((m2)*g*r /(m1)) plug in the values and you are done… v = sqrt(2.5*9.81*.2)/(1.5) = 1.80831 Dr. ...
*Thursday, November 5, 2009 at 5:51am by Kevin*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A gunman standing on a sloping ground fires up the slope. The initial speed of the bullet is v0= 340 m/s. The slope has an angle α= 12 degrees from the horizontal, and the gun points at an angle θ from the horizontal. The gravitational acceleration is g=10 m/s2. (a) ...
*Sunday, January 12, 2014 at 8:23am by Anonimus*

**Phisics**

Two identical springs (neglect their masses) are used to “play catch” with a small block of mass 200 g (see the figure). Spring A is attached to the floor and compressed 10.0 cm with the mass on the end of it (loosely). Spring A is released from rest and the mass is ...
*Sunday, July 3, 2011 at 1:14pm by Luis*

**Phisics**

Two identical springs (neglect their masses) are used to “play catch” with a small block of mass 200 g (see the figure). Spring A is attached to the floor and compressed 10.0 cm with the mass on the end of it (loosely). Spring A is released from rest and the mass is ...
*Sunday, July 3, 2011 at 1:19pm by Luis*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A merry-go-round (pictured) is sitting in a playground. It is free to rotate, but is currently stationary. You can model it as a uniform disk of mass 210 kg and radius 110 cm (consider the metal poles to have a negligible mass compared to the merry-go-round). The poles near ...
*Sunday, December 8, 2013 at 7:14am by Anonimus*

**Phisics**

x=2.2•10⁻² m v=0.65 m/s m=2 kg k =240 N/m => ω=sqrt(k/m) = sqrt(240/2) =11 rad/s x=Asin ωt v= ω Acos ωt tan ωt = xω /v=2.2•10⁻²•11/0.65 =0.372 ωt =20.4° sin ωt=0.349 x=Asin ωt A=x/sin ωt =2.2•10⁻...
*Wednesday, November 27, 2013 at 12:17am by Elena*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

p + (1/2) rho v^2 = constant rho = water density = about 1000 kg/m^3 p = rho g h p big pipe + (1/2) rho vbig^2 = plittle pipe + (1/2)rho vlittle^2 p big pipe - p little pipe =1000(9.81)(4) = 39240 Newtons/m^2 or Pascals so 39240 = (1/2)(1000)(vlittle^2-vbig^2) now what can we ...
*Monday, January 6, 2014 at 3:11pm by Damon*

**phisics**

A 7.45-g bullet is moving horizontally with a velocity of +348 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The ...
*Sunday, November 4, 2012 at 9:46pm by greg*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

A pendulum of mass m= 0.9 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum is measured from the ...
*Sunday, January 12, 2014 at 8:20am by Anonimus*

**phisics**

m=7,45 g, m1=1220 g, m2=1603 g, v=348 m/s, v1 = 0.648 m/s The law of conservation of linear momentum for the 1st collision m•v+0=m1•v1+m•u u=(m•v-m1•v1)/m = v –(m1/m)v1= 348 – (1220/7.45) •0.648 = 241.9 m/s, The law of conservation of linear momentum for the 2nd collision mu+0...
*Sunday, November 4, 2012 at 9:46pm by Elena*

**English**

Hey, Is this a text with a lot of mistakes in a/an, the? The most people live in the city called Berlin in Germany, where they eat mostly a Weisswurst for a meal and the people weare all Dirndls ans the Lederhosen. When they go to the school they learn the most common subjects...
*Tuesday, December 18, 2012 at 2:14pm by Minnie*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 8 % of its mass in 280 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 140.0 s? (suppose that the rocket...
*Sunday, December 8, 2013 at 7:16am by Anonimus*

**phisics**

plzz help me with my homework!!! Tarzan, played by Patrick Huard, 60 kg, must cross a stream 5 m wide, and full of hungry crocodiles. To do this, decides to slide along a sloping tree trunk, hollowed and moist so that there is no friction. After the trunk, there is a part of 3...
*Wednesday, November 16, 2011 at 7:00pm by sarah*