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April 17, 2014

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Physics (verification)
I would love for someone to please verify my solution for this problem: A former amusement park attraction consisted of a huge vertical cylinder rotating rapidly around its axis. The rotation speed should be sufficient for the people found inside to be stuck to the wall when ...
Friday, December 9, 2011 at 3:09pm by Greg

Physics - Verification
Hello, just wanted to verify is what I did is good. I posted this question yesterday and Bob helped me, so just wanted to be sure it's good. The problem is: A bloc of 10 kg is put at the top of an inclined plan of 45 degrees (to the left), attached to a spring which has a ...
Friday, February 3, 2012 at 6:33pm by Raf

Physics - Verification
made a mistake when I wrote Ef = Kf + Ugf instead it's --> Ef = Kf + Ugf + Usf
Friday, February 3, 2012 at 6:33pm by Raf

Physics - Verification
where Kf is = 0
Friday, February 3, 2012 at 6:33pm by Raf

Physics - Verification
No it does not make sense. Workdone by gravity= force down plane*distance= mg*sinTheta*x Work done on spring: 1/2 k x^2 Work done on friction: mg*cosTheta*mu*x so mgSinTheta*x=1/2 kx^2+mgCosTheta*mu*x divide by x, then group terms 1/2 kx=mg(SinTheta-mu*CosTheta) 125x=98(.7-.3...
Friday, February 3, 2012 at 6:33pm by bobpursley

Physics - Verification
ohhh I see now, but when you say Work done on spring, you take the Energy formula which is 1/2 k x^2 , wouldn't the work on a spring be mu*N*x?
Friday, February 3, 2012 at 6:33pm by Raf

Physics - Verification
and why isn't it Wg = Wspring - Wfriction as friction is going to other way?
Friday, February 3, 2012 at 6:33pm by Raf

Physics - Verification
nevermind my first question, my mistake hehe
Friday, February 3, 2012 at 6:33pm by Raf

Physics - Verification
your second quesion. Friction absorbs energy, as does the spring. They add to equal the energy input of the system.
Friday, February 3, 2012 at 6:33pm by bobpursley

Physics - Verification
okay cool, thanks a lot Bob
Friday, February 3, 2012 at 6:33pm by Raf

Physics - Verification
The sine is correct function to use, but you made a mistake in the multiplication. Work done by friction (on snow) and aerodynamic drag is negative. The skier does the work. The absolute value equals the gravity work only if the kinetic energy does not change.
Monday, February 6, 2012 at 7:40pm by drwls

Physics - Verification
A skier (75 kg) goes down a 15* slope. The coefficient of kinetic friction between the skis and the snow is 0.185. The length of the slope is of 500m. a) What is the work done by gravity? Answer) Wmg = mgd = 75kg(9.8N/kg)500m(sin15) = 354 977 J Is it cos or sin? And is Work ...
Monday, February 6, 2012 at 7:40pm by Raf

Physics - Verification
The sine is correct function to use, but you made a mistake in the multiplication. Work done by friction (on snow) and aerodynamic drag is negative. The skier does the work. The absolute value equals the gravity work only if the kinetic energy does not change.
Monday, February 6, 2012 at 7:40pm by drwls

Physics - Verification
oh and I see what you mean, it's 95 116 J, thanks again!
Monday, February 6, 2012 at 7:40pm by Raf

Physics - Verification
what is the mistake? And thank you for the information!
Monday, February 6, 2012 at 7:40pm by Raf

Physics - Verification
and drag and friction work has to be higher at the end than gravity in order to stop the skier at the bottom, right?
Monday, February 6, 2012 at 7:40pm by Raf

Physics - Verification
75*9.8*500*(sin15) = 9.516*10^4 J
Monday, February 6, 2012 at 7:40pm by drwls

Physics - Verification
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire? So I ...
Sunday, August 12, 2012 at 11:12pm by Robert

Physics - Verification
B1=μₒ•I1/2•π•r1 =4π•10^-7•30/2•π•0.15 =4•10^-5 T, B2=μₒ•I2/2•π•r2 =4π•10^-7•40/2•π•0.25 =3.2•10^-5 T. Generally there are two points which are separated by given distances from I1 (point M) and I2 (point N), where we have to...
Sunday, August 12, 2012 at 11:12pm by Elena

Physics Verification
A poorly tuned Prius can accelerate from rest to a speed of 28 m/s in 20s. a) what is the average acceleration of the car? my answer is 1.4 b) Find its displacement in this time. my answer = 280 Can anyone verify this please?
Saturday, October 26, 2013 at 11:25am by Alexander

Physics Verification
correct. good work.
Saturday, October 26, 2013 at 11:25am by Steve

Physics (verification)2
I would love for someone to please verify my solution for this problem: A former amusement park attraction consisted of a huge vertical cylinder rotating rapidly around its axis. The rotation speed should be sufficient for the people found inside to be stuck to the wall when ...
Saturday, December 10, 2011 at 11:28am by Greg

Physics (verification)2
Some of your equations are wrong, even dimensionally. For example, us is dimensionless but v^2/g has dimensions of length. The equation should be (M V^2/r)*us = M g V = sqrt(r*g/us) = 11.43 m/s
Saturday, December 10, 2011 at 11:28am by drwls

Calculus Verification
I just want to make sure im right. Find the derivative if y= arcsec(x+3). I got 1 ======================= |x+3|sqrt(x+3)^(2)-1 Is this the final answer or do you need to solve (x+3)^2 and get (x^(2) + 9x + 9)
Sunday, October 7, 2007 at 10:43pm by Matt

Calculus Verification
The answer is 1 -------------------- (x+3)sqrt[(x+3)^2 -1] Your answer should not have absolute value | | symbols around x+3, and needs brackets around (x+3)^2 -1, to show that you take the square root of everything in brackets.
Sunday, October 7, 2007 at 10:43pm by drwls

CHEMISTRY VERIFICATION
92.58*10^6 = 148,988,994km 148988994/2.88*10^-13=5.17*10^20 This doesn't seem right?
Wednesday, September 24, 2008 at 6:15pm by Nicole

Chemistry...verification
2 equation 2CoI3 + 3 K2S= Co2S3 + 6KI 2 moles of Cobalt (III) iodide + 3 moles of Potassium sulfide = cobalt (III) sulfide + 6moles of Potassium Iodide assuming all that can react will react, how many grams of cobalt (iii) sulfide will form when 1318.89 grams of cobalt (III) ...
Sunday, October 10, 2010 at 6:16pm by pete

Chemistry...verification
You got lucky. CoI3 is the limiting reagent; therefore, the mass Co2S3 depends upon the starting amount of CoI3 and 321.09 g is the correct answer. (You are allowed more places than 321). Here is how you figure in the K2S. moles CoI3 1318.89/439.6466 = rounds to 3.0 moles CoI3...
Sunday, October 10, 2010 at 6:16pm by DrBob222

Algorithm Verification
Please give example of algorithm verification.
Thursday, June 23, 2011 at 10:57pm by JoJo03

Algorithm Verification
In google type algorithm verification.
Thursday, June 23, 2011 at 10:57pm by Anonymous

Calculus - Verification
Hello, I just wanted to verify this definite integral and if my answer is good: a = 1 and b = 4 integral of (1 - 1/x^2)(x^2 + 1/x) dx = (x + 1/x)(x^3/3 + lnx) + C (4 + 1/4)(64/3 + ln4) - (1 + 1)(1/3 + ln1) = 96.56 - 0.6666 = 95.89 THank you
Tuesday, August 7, 2012 at 5:53pm by Paul

Calculus - Verification
I do not think so. Multiply out and integrate each term.
Tuesday, August 7, 2012 at 5:53pm by Damon

Calculus - Verification
(x^2 -1 + 1/x -1/x^3)dx x^2 dx - dx + dx/x - dx/x^3 x^3/3 etc
Tuesday, August 7, 2012 at 5:53pm by Damon

Calculus - Verification
integral a b dx is not integral a dx * integral b dx
Tuesday, August 7, 2012 at 5:53pm by Damon

tatiana
A car tire of radius 45cm turns at a constant 14 rads/s. For a point on the edge calculate a) the tangential V b) the tangential a c) the centripetal "a" work: a) v= rw v= .45m * 14 rads/s= 6.3m/s b) at=alphar alpha= w/t I am unsure how to get time? c) at= w^2r at= 14^2 * .45 ...
Saturday, December 9, 2006 at 2:34pm by physics

susane
I have a question concerning waves. What effect does increasing the tension in a vibrating string have upon wavelength? I was thinking that as the weight increases more standing waves are created. As more standing waves are created, the wavelength decreases. I have one more ...
Saturday, February 3, 2007 at 7:29pm by Physics

micole
White light strikes a diffraction grating (930 lines/mm) at normal incidence. What is the longest wavelength that forms a second-order maximum? I used the equation [(1/d)sin(90)]/m = wavelength: [(1/0.93m)(1)] /2 = 0.5376m. To convert to nm I multiplied by 10^-9. This is ...
Sunday, August 19, 2007 at 8:00pm by PHYSICS

mojo
A hydrogen atom is in its elevnth excited state, n = 12. Using the Bohr model of hydrogen, find the linear momentum. You want to solve for the electron velocity and multiply that by the electrn mass. There are many ways to do this. One would be to get the radius of the orbit ...
Monday, August 20, 2007 at 11:41am by physics

natali
A 100W light bulb is left on for 10hrs. Over this period of time how much energy is used by the bulb? am i doing this right? my guess is to convert 100W to kW and convert 10 hrs to seconds and multiply the 2 together? which gives 3600J or should i just leave it in watts?
Monday, October 22, 2007 at 3:12am by Physics

Movies and physics
Hello...I need to find a modern day movie that has at least three or more physics mistakes. I need to prove they are mistakes...as well, is Zeno's Paradox a credited/valid source to use to prove something such as the everlasting gobstopper, from Willy Wonka, is physically ...
Wednesday, December 19, 2007 at 8:26pm by Physics!

french
Did you write this yourself? I am not sure if this makes sense or not...depui is not a word, it is depuis, and I am not sure that this sentence structure works either. What is this supposed to mean?
Wednesday, December 19, 2007 at 6:24pm by Physics!

A physics problem
Hello...I need to find a modern day movie that has at least three or more physics mistakes. I need to prove they are mistakes...as well, is Zeno's Paradox a credited/valid source to use to prove something such as the everlasting gobstopper, from Willy Wonka, is physically ...
Wednesday, December 19, 2007 at 9:38pm by Physics!

Jenish
A 1200 W hair dryer is designed for 117 v. a) What will be the percentage change in power output if the voltage drops to 105 v. b) How would the actual change in resistivity with temperature affect your answer.
Saturday, February 16, 2008 at 2:43am by Physics

Jenish
Suppose you want to run some apparatus that is 95 m from an electric outlet. Each of the wires connecting your apparatus to the 120 v source has a resistance per unit length of .0065 ohms/m. If your apparatus draws 3.0 A what will be the voltage drop across the connecting ...
Saturday, February 16, 2008 at 2:51am by Physics

physics.
1500W thingy heats1.5kg water from 18C to 59C in 3.0minutes. How mcuh n-ergy was used by the thingy?
Tuesday, February 19, 2008 at 2:54pm by physics.....

physics.
a 1500W thing heats 1.5kg of water from 18C- 59C in 3 minutes. how mcuh energy was used by the thing? how much energy was delivered to the waterr??
Thursday, February 21, 2008 at 12:51am by physics.....

Physics
hmmm aparently that's not how you do it hmmm could you please show me how to get the time step by step don't you have to use this equation X = 2^-1 a t^2 + Vo t + Xo write it in the second dimension Y = 2^-1 g t^2 + Vo t + Yo and sense there is no Yo I get this Y = 2^-1 g t^2...
Saturday, July 11, 2009 at 9:20pm by Physics

Physics
Ok I asked this question before A lbock is given an intial speed of 4.0 s^-1 m up the 22 degree plane How far up the plane will it go ok I got this to be something like 2.2 about i understand this i need help on this how much time elapses before it returns to tis starting ...
Saturday, July 11, 2009 at 9:20pm by Physics

Chels
What can you say about the motion of a body if its veloctiy-time graph is a straight line inclined with the time axis? a. the body moves with uniform velocity b.the body moves with uniform acceleration c. the body moves with non uniform acceleration d. the body moves with ...
Tuesday, April 29, 2008 at 1:33pm by Physics

tom
The sound emitted by bats has a wavelength of 3.0 mm. What is the sound's frequency in air? how do i do this??
Wednesday, April 30, 2008 at 4:23pm by physics

Phyiscs
A lbock is given an intial speed of 4.0 s^-1 m up the 22 degree plane How far up the plane will it go ok I got this to be something like 2.2 about i understand this i need help on this how much time elapses before it returns to tis starting point? Ignore friction. ok I need to...
Saturday, July 11, 2009 at 7:39pm by Physics

sara
In a constant-volume process, 211 J of energy is transferred by heat to 1.05 mol of an ideal monatomic gas initially at 303 K. (a) Find the increase in internal energy of the gas. J (b) Find the work done on it. J (c) Find its final temperature. K i am having trouble with this...
Tuesday, October 21, 2008 at 5:03pm by physics

sara
In a constant-volume process, 211 J of energy is transferred by heat to 1.05 mol of an ideal monatomic gas initially at 303 K. (a) Find the increase in internal energy of the gas. J (b) Find the work done on it. J (c) Find its final temperature. K i am having trouble with this...
Tuesday, October 21, 2008 at 5:14pm by physics

physics
I need help with solving these word problems. Marion rides her racing bicycle @ speed of 8 m/s. Bicycle wheels have a radius of 34 cm. What is the angular speed of wheels? How many times does each wheel go around during a 10-min race? A car tire has radius of 33cm. Tire turns ...
Monday, December 1, 2008 at 8:21pm by physics

Physics
I need help with solving these word problems. Marion rides her racing bicycle @ speed of 8 m/s. Bicycle wheels have a radius of 34 cm. What is the angular speed of wheels? How many times does each wheel go around during a 10-min race? A car tire has radius of 33cm. Tire turns...
Monday, December 1, 2008 at 8:59pm by physics

Physics
Is the answer for the 1st question ...23.5 rad/ sec? Is the answer for the 2nd question...66 times? Is the answer for the 3rd question...3382.5 meters?
Monday, December 1, 2008 at 8:59pm by physics

Physics
I need some help getting a formula. I remember in class u get this really wierd looking equation like Vicosg-((vsin(pheta))/2g) I think this is what the equatin is when I'm asked to "Derive a formula for the Range of a projectile based on Vi and the Launch angle, pheta. State ...
Monday, December 8, 2008 at 8:10pm by Physics

physics
I need some help getting a formula. I remember in class u get this really wierd looking equation like Vicosg-((vsin(pheta))/2g) I think this is what the equatin is when I'm asked to "Derive a formula for the Range of a projectile based on Vi and the Launch angle, pheta. State ...
Monday, December 8, 2008 at 10:42pm by Physics

Physics
A crate is pulled right with a force of 82.0N to the left wtih a force of 115N upward with a force of 565N and downward with a force of 236N Fine the net external force in the X direction Find the net external force in the y direction find the the magnitude and direction of ...
Sunday, December 14, 2008 at 4:16pm by Physics

physics
A craet is pulled right with a force of 82.0 N to the left with a force of 115N upward with a force of 565N and dow ward with a force of 236N Find the net external force in the x direction find the net external force in the y directin find the magnitude and direction of the ...
Sunday, December 14, 2008 at 5:08pm by Physics

physics
a ugst of wind blows an apple from a tree. AS teh apple falls the force of gravit on the apple is 9.25N downward and the force of the wind on the apple is 1.05N ot the right. Find the magnitude and direction fof the external force on the apple
Sunday, December 14, 2008 at 6:53pm by Physics

physics
how does tan give me direction?
Sunday, December 14, 2008 at 6:53pm by Physics

physics
What gives? projectile launched @ 10.0 m/s @ 45.0 degrees figured everyhting out go these three points I'm trying to apply my Algebra 2 class stuff to it to get the equation of the perabala (0,0) (5.1 , 20.4) (10.2 , 0 ) then i use matrix to find the values and my equation i ...
Monday, December 22, 2008 at 6:40pm by physics

physics
please my post from earlier
Monday, December 22, 2008 at 9:11pm by physics

physics
the other physics question
Monday, December 22, 2008 at 9:11pm by physics

physics
i have to build a catapult that will fire a projectile that will pass a 1m tall wall 1 m away from starting point and land in a target 1 m away from the wall. the catapult cant be more than 23cm high. I'm having some problems here with this for simpicity issues i said launch ...
Thursday, December 25, 2008 at 3:13pm by physics

physics
sigh this is killing me here... ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from launch point that is 1800m high. There's a boat 610 m from the island. So i'm suppose to find out how much it'll clear the moutain and close it'll come ...
Wednesday, January 14, 2009 at 10:23pm by physics

Physics
sigh this is killing me here... ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from launch point that is 1800m high. There's a boat 610 m from the island. So i'm suppose to find out how much it'll clear the moutain and close it'll come ...
Wednesday, January 14, 2009 at 10:51pm by physics

physics
please answer my question below
Thursday, January 15, 2009 at 5:24am by physics

Peter
A 200 N/m, 5 m spring on a 20 degree incline is compressed 2.3 m and a 5 kg block is placed on it. If we neglect friction, how far up the incline will the block travel? How fast will it be traveling when it is 0.2 m up the incline?
Thursday, January 15, 2009 at 1:31pm by Physics

Physics
A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s^2. Determine the coefficient of kinetic fiction between the box and ramp. I'm not exactly sure what to do here I know the formulas are uk = Fk/Fn Us = Fs, max/Fn not exactly sure how to do this problem with ...
Wednesday, January 28, 2009 at 10:23pm by physics

Physics
A 2.0 kg mass starts from rest and slides down an inclined plane 8.0 X 10^-1 m long in .50s. what net force is acting on the mass along the incline. I have no idea how to do this I don't know why they just didn't say .8m the back of the book says 13 N down the incline I can ...
Wednesday, January 28, 2009 at 10:30pm by physics

physics
A 5.0 kg bucket of water is raised form a well by a rope. If the upward acceleratiopn of the bucket is 3.0 m/s^2 find the force exerted by the rope on the bucket of water what exactly do i do here? 3.0 m/s^2 upward? is this the Fn? I have no idea how to do this problem...
Wednesday, January 28, 2009 at 10:40pm by physics

physics
odd i never seen this formula before and we haven't goten to tension yet thank you
Wednesday, January 28, 2009 at 10:40pm by physics

Physics
I don't see how I have enough information to answer this question If a car is traveling westward with a constant velocity of 20 m/s what is the net external velocity
Monday, February 2, 2009 at 5:57pm by Physics

Physics
well the net force is obivuosley greater than friction sense it's moving allowing it to move 20 m/s f=ma i don't know the mass so I don't know what to do here?
Monday, February 2, 2009 at 5:57pm by Physics

Physics
here's another one that i have no idea how to do If a car is accelerating downhill under a net force of 3674 N what force must the brakes exert to cuase the car to have a constant velocity?
Monday, February 2, 2009 at 5:57pm by Physics

Physics
An object thrown into the air stops at the highest pooint in its path is it in equilbrium at this point explain? I siad yes because it's moving for that one breif moment I wasn't sure or not so I'm asking to see if this is right
Monday, February 2, 2009 at 6:07pm by Physics

Physics
Yah i got another question a large crate is placed on the bed of a truck but is not tied down as the truck accelerates forward the crate slides across the bed until it hits the tailgate explain what causes this i'm completley lost
Monday, February 2, 2009 at 6:13pm by Physics

Physics
A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s^s Determine the coefficent of kinetic friction between the box and the ramp How on earth do I do this with only this amount of information???
Tuesday, February 3, 2009 at 8:44pm by Physics

Brock
An object creates an inverted, virtual image, 3 cm tall, 10 cm from a converging mirror with a focal length of 15 cm. Where is the object located? How tall is it? I didn't think mirrors created inverted virtual images...
Tuesday, February 24, 2009 at 10:04pm by Physics

KC
When a plane experiences a decrease in weight must there also be decrease in lift? I'm thinking the answer is yes in order to maintain equilibrium.
Wednesday, March 11, 2009 at 3:22pm by Physics

KC
Great! thanks a lot.
Wednesday, March 11, 2009 at 3:22pm by Physics

physics
A certain radio wave has a frequency of 2.0 * 10^6 Hz. what is its wavelength?
Wednesday, March 11, 2009 at 6:30pm by physics

physics
here is my question: A bullet with a mass of 6.00 g is fired through a 1.25 kg block of wood on a frictionless surface. The initial speed of the bullet is 896 m/s, and the speed of the bullet after it exits the block is 435 m/s. At what speed does the block move after the ...
Wednesday, March 11, 2009 at 6:38pm by physics

physics
find the final equilibirum temperature when 10.0 g of milk at 10.0degC is added to 1.60*10^2 g of coffee with a temperatrure of 90.0degC. Assume the specific heats of coffee and milk are the same as for water (Cp,w=4.19J/g*degC) and disregard the heat capacity of the container...
Wednesday, March 11, 2009 at 6:41pm by physics

history
so its A
Wednesday, March 11, 2009 at 6:24pm by physics

physics
so Tf is 84.70?
Wednesday, March 11, 2009 at 6:41pm by physics

physics
can you please show me?
Wednesday, March 11, 2009 at 6:38pm by physics

physics
here is my problem: a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the corresponding object is at a distance of 36.0 cm, what is the mirror's focal length? here's my work: 1/f = 1/v + 1/u where f=focal length=? u= -36 cm (...
Wednesday, March 11, 2009 at 9:44pm by physics

physics
here is my problem: a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the corresponding object is at a distance of 36.0 cm, what is the mirror's focal length? here's my work: 1/f = 1/v + 1/u where f=focal length=? u= -36 cm (...
Wednesday, March 11, 2009 at 9:50pm by physics

physics
please check these: a laser can be used a. to treat glaucoma b. to measure distance c. to read bar codes d. all of the above D in a laser, all of the following forms of energy can be converted into coherent light except a. chemical energy b. electrical energy c. light d. ...
Wednesday, March 11, 2009 at 9:57pm by physics

physics
here is my problem: a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the corresponding object is at a distance of 36.0 cm, what is the mirror's focal length? here's my work: 1/f = 1/v + 1/u where f=focal length=? u= -36 cm (...
Thursday, March 12, 2009 at 11:04am by physics

physics
please help: A repelling force occurs between two charged objects when the charges are of a. unlike signs b. like signs c. equal magnitude d. unequal magnitude
Thursday, March 12, 2009 at 11:09am by physics

physics
how would i go about solving this problem? what formula shoud i use? can you please show me in steps how to do this, thanks a lot: The critical angle of refraction for calcite is 68.4degrees when it forms a boundary with water. Use this information to determine the speed of ...
Thursday, March 12, 2009 at 4:50pm by physics

physics
pleaase help me with this, i'm very bad in physics, and i mostly don't understand any of this stuff...can anyone explain as well as show me how to do this Monochromatic light from a helium-neon laser (wavelength=632.8 nm) shines at a right angle onto the surface of a ...
Thursday, March 12, 2009 at 4:59pm by physics

History
the confederates also thought that if they had a choice to be a united nation, they also had a choice to leave it.
Thursday, March 12, 2009 at 4:43pm by physics

MATH
11/5 is an improper fraction, once you divide it, it will become a mixed number like MS.Sue said, 2 1/5
Thursday, March 12, 2009 at 4:25pm by physics

physics
please check these for me: What is the wavelength of microwaves of 3.0*10^9 Hz frequency? a. 0.050m b. 0.060m c. 0.10 m d. 0.20 m C If a light ray strikes a flat mirror at an angle of 30deg from the normal, the ray will be reflected at an angle of a. 30deg from the mirror's ...
Thursday, March 12, 2009 at 6:54pm by physics

physics
please check these for me: If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed? a. both would be later b. both would be earlier c. sunrise would be later, and sunset would be earlier d. sunrise would be earlier, and sunset ...
Thursday, March 12, 2009 at 7:02pm by physics

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