Net Definition and 1000 Threads

So I have the mass, volume, and the density of the gas inside it...how do i work out the net force? Is it to do with working out weight and then viscous drag?

1. Homework Statement Three charges lie along the x -axis. The positive charge q1 = 10.0 microC is at x = 1.00 m, and the negative charge q2 = -2.00 microC is at the origin. Where must a positive charge q3 be placed on the x-axis so that the resultant force on it is zero? Answer: x = - 0.809 m...

Homework Statement Hickey reached a speed of 35 m/s on his skateboard . Suppose it took 21,000 Joules of net work for Hickey to reach this speed from a speed of 25 m/s. Find Hickey's mass Homework Equations Work = Force x Distance Cos(theta) The Attempt at a Solution From my...

Your 2000 kg Mercedes is accelerated from 10 m/s to 30 m/s in 4.75s. What is the average net force that you have applied to the car in that time interval?Givens are: mass= 2000 kg time= 4.75s acceleration=(Vf-Vi)/t= (30m/s-10m/s)/4.75s= 4.21m/s2 F=m*a= 2000kg*4.21m/s2= 8420 N Unidentified...

The masses and coordinates of three particles are as follows: 20.0 kg, (0.50, 1.00) m; 309.0 kg, (-1.00, -1.00) m; 18.0 kg, (0.00, -0.50) m. What is the gravitational force on a 20.0 kg sphere located at the origin due to the other spheres, magnitude and direction? Give the direction as an angle...

Homework Statement a weight lifter lifts a set of weights a vertical distance of 3.64 m. if a constant net force of 394 N is exerted on the weights, how much net work is done on the weights ? Homework Equations i need net work formula The Attempt at a Solution

a weight is lifted 3.64m if a constant net force of 394N is exerted on the weights, how much net work is done on the weights? in J that is..

How do you find the net force in vector addition, for example if I have F1 = 64 N @ 30 degrees and F2 = 45 N @ 45 degrees and F3 = 78 N @ 330 degrees how would I go about finding the net force?

A dog pulls on a pillow with a force of 7.9 N at an angle if 28.3 degrees above the horizontal \vec{F}_{net} = \Sigma \vec{F} = m \vec{a} A) What is the x component of this force? answer in units of N. B) What is the y component of this force? answer in units of N. help pls i...

Homework Statement A cylindrical shell of radius 7.00 cm and length 240 cm has it's charge uniformly distributed on it's curved surface. The magnitude of the electric field at a point 19.0cm radially outward from its axis (measured from the midpoint of the shell) is 36.0 kN/C. Find (a) the net...

Homework Statement A hamburger with a mass of 2500 kg was slided down a ramp that has a 45 degree incline, and the coefficient of kinetic friction betwen the hamburger and the ramp is .597. What is the net force acting on the hamburger? What is the net acceleration?Homework Equations Mass of...

Homework Statement [/B] A 2.0 kg otter starts from rest at the top of a muddy incline 85 cm long and slides down to the bottom in 0.50 s. What net force acts on the otter along the incline? mass = 2.0 kg distance = 85 cm time = .50 s net force = ?Homework Equations Fnet=ma I also used. V=x/t...

2 problems both with dealing with finding the magnitude of a net force. 1. A gust of wind blows an apple from a tree. As the apple falls, the gravitational force on the apple is 2.25 N downward, and the force of the wind on the apple is 1.05 N to the right. Find the magnitude and direction of...

Homework Statement It was just a basic work problem: The two ropes seen in the figure below are used to lower a 245 kg piano 6.0 m from a second-story window to the ground. How much work is done by each of the three forces? (T1 = 1910 N andT2 = 1140 N) There was a diagram with the...

Basically my instructor is confusing the heck out of me because I highly dislike how this course is structured. I dislike how in this specific chapter we are not taught: \SigmaW = \DeltaEnergy However, using this equation and my previous knowledge I can't seem to get the right answer in the...

Homework Statement Write the net ionic equation for H2SO4(aq) to the KMnO4(aq)Homework Equations The Attempt at a Solution I am confused on which one should i write. The first method is to list all the species, then use the data book to find which one is the strong OA and SRA. Multiply one or...

Can this be explained in terms of inelastic collisions? This is what I think: The collision is perfectly inelastic because the person and the net move together with the same velocity. This means that the initial kinetic energy of the system (and therefore the kinetic energy of the person) is...

Can someone tell me the full formula and net ion equation for these? I can't seem to get them right even thought I think my answers are right. a.NaClO(aq) + HCl(aq) → ( I got NaClO(aq) + 2HCl(aq) -> Cl2(aq) + NaCl(s) + H2O(l) but it won't accept my answer, so no idea of net equation.) b...

1. Mass m_1 on the frictionless table of the figure is connected by a string through a hole in the table to a hanging mass m_2. With what speed must m_1 rotate in a circle of radius r if m_2 is to remain hanging at rest...

When on the ground, Ian's weight is measured to be 646 N. When Ian is on an elevator, his apparent weight is 711 N. What is the net force on the system (Ian and the elevator) if their combined mass is 1050 kg? I know that Fnet is the sum of all forces. I don't have any examples of this...

Homework Statement A 58 kg person is in a head-on collision. The car's speed at impact is 13 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys. For some reason, I can't seem to get the correct answer to this question... I have no idea...

Homework Statement A force of 2N east and a force of 3N 25degrees N of E act on an object. What is the net force on the object? The answer according to the text is 4.9N 75Degrees E of N Homework Equations The Attempt at a Solution First express direction in terms of x-axis...

Homework Statement file:///C:/Documents%20and%20Settings/sjthompson/Desktop/p8-3.gif Don't know if the image worked. I think if you copy and paste it into browser it might work. Calculate the net torque (mag and direction) on the beam in the figure below about the following axes. Beam has...

Homework Statement I am given two two dimensional velocities one final one initial and the time taken for the velocity of the object to change. I am also given the mass and asked to calculate net force. The calculations are very easy but when asked for the net force am I supposed to give...

An experimental rocket sled can be accelerated at a constant rate from rest to 1000 km/h in 1.8 s. What is the magnitude of the required net force if the sled has a mass of 700 kg? help please!

Homework Statement 285 kg rowboat being pushed by a forward force of 112 N from the paddles. If its is accelerating at 0.120 m/s(squared) how much water resistance is it experiencing? (assume gravity and buoyancy cancel each other) Given: a = 0.120 m/s (2) Forward force = 112 N Mass =...

Homework Statement Figure 7-30 shows an overhead view of three horizontal forces acting on a cargo canister that was initially stationary but that now moves across a frictionless floor. The force magnitudes are F1 = 2.70 N, F2 = 5.31 N, and F3 = 9.69 N, and the indicated angles are θ2 =...

Homework Statement 13 equal charges, q, are situated at the corners of a regular tridecagon. What is the net force on a test charge, Q, situated at the centre. Homework Equations F=k(qQ/r^2) r^ (r^=r vector/r) The Attempt at a Solution The net force will be zero due to the...

Homework Statement The milky way galaxy ( which includes the Sun) rotates about its center with a period of 200 million years. The Sun is 2X10^20m from the center of the galaxy. What is the net gravitational force on the sun due to the other stars in the milky way galaxy? Homework Equations...

the pathway for a mineshaft is described as follows: The first shaft extends north and down at an angle of 3.5 degree for 225ft to a vertical shaft which 125ft long. A third shaft then extends north and down at an angle 6.8 degree for 175ft. What is the total depth below ground level at the end...

Homework Statement Three charges lie along the x -axis. The positive charge q1 = 10.0 microC is at x = 1.00 m, and the negative charge q2 = -2.00 microC is at the origin. Where must a positive charge q3 be placed on the x-axis so that the resultant force on it is zero? Answer: x = - 0.809 m...

Homework Statement A 325 N force acts on an object with a mass of 42.5 kg at an angle of 27° , pulling the object along a flat surface. The coefficient of friction is 0.21 and the object's displacement is 320m. Calculate the net work done on the object. Homework Equations W=Fdcos(θ) Fg=mg...

Homework Statement Hey I am having problems understanding how to get the net ionic and ionic formula. Any suggestions and/or tips on how to do them?

neutron star has a mass of 2.0 x 10^30 kg, and a radius of 5.0 x 10^3 m suppose an object falls from rest near the surface of such a star. how fast would it be moving after it had fallen a distance of 0.010 m? (gravity constant over star, and star is not rotating) and a person in a...

what is the net force acting on m1 in terms of T, g, and m1?

A 3.40 kilogram mass is moving in a plane, with its x and y coordinates given by x = 4.85t2 - 1.05 and y = 3.25t3 + 2.10, where x and y are in meters and t is in seconds. Calculate the magnitude of the net force acting on this mass at t = 2.10 seconds. I don't know if I am supposed to...

Homework Statement Given two particles with 2.00 microcoulombs charges and a particle with charge q= 1.28x10^-18C at the origin.(a) what is the net force exerted by the two 2.00 microcoulombs charges on the test charge q? (b) What is the electric field at the origin due to the two 2.00...

Homework Statement You're 1.5 m from a charge distribution whose size is much less than 1 m. You measure an electric field strength of 282 N/C. You move to a distance of 2.0 m, and the field strength becomes 119 N/C. Hint: Don't try to calculate the charge. Instead determine how the...

Homework Statement I have a test on this tomorrow .. please help.. A box, initially at rest, is pushed up a ramp by a constant force acting 20 degrees above the ramp’s surface (pushing into the ramp from behind the box). The magnitude of the force is 50.0 N. The coefficient of friction is...

Hello guys, I just need help understanding this question for my introductory physics class...my friend gave me the answer but I am not really sure i trust him or believe in his logic he used to figure it out...please help i attached the drawing so yall can see it! all it states is: what is...

Homework Statement What is the average net force on a car during a zero to 60mph (0 to 30m/s) acceleration? Compare this force to the weight of the car. Homework Equations I just don't know what equations to do and need help to figure out what to do.

I've been struggling with this for a while now. Cu(ClO4)2 is soluble so it should drop from both sides of the net ionic equation, right? Leaving only H20. Am I missing something? http://usera.imagecave.com/hotrod73dart/question/netionic.JPG

Homework Statement Mass of ball=0.500kg string length=1.02m I have a motion diagram of a ball being spun in a counter clockwise direction. there are four points on the circular diagram this is the best I can do right now ......v= 4.0m/s ......| ......| v=6.0m/s ---------- v= 6.0m/s...

Homework Statement http://carlodm.com/images/chem.png The Attempt at a Solution The attempt is in the image. HOW IS THIS WRONG?? I've looked at it for hours now!

Question is in orange, answer is in black. I got no idea how they got this answer :\ The way I am trying is using a substition of kx^2 = gsin\theta Just the one question i can't get my head aroung in this exercise step by step method would be appreciated

Homework Statement A conducting spherical shell has a total net charge of +2 micro Coulombs. A point charge of Q = -3 micro coulombs is placed at the center of the sphere. What is the total net charge on the inner surface of the sphere? Homework Equations coulombs law= kq1q2/r^2...

Homework Statement Two blocks with masses m1 = 1.10 kg and m2 = 3.20 kg are connected by a massless string. They are released from rest. The coefficient of kinetic friction between the upper block and the surface is 0.490. Assume that the pulley has a negligible mass and is frictionless, and...

I understand that to find moment of force, we look at direction of force and perpendicular distance. In the diagram, O is the centre and pivot of the circular disc. Would the anticlockwise moment at A be (30N x 4m)? I'm not sure if this is true, cos the distance 4m is only AB. It does not...

Homework Statement It's webbased, so I just took a screenshot: http://img27.yfrog.com/img27/2237/pyquestion.jpg Homework Equations F = ma The Attempt at a Solution Well, the way I figured it was that we could determine the force by calculating the average velocity between two...

[b]1. For women's volleyball the top of the net is 2.24m above the floor and the endline is 9.00m from the net. Using a jump serve, a player strikes the ball at a point 3.00 m above the floor and 8.00m (horizontally) from the net. If the initial velocity of the ball is horizontal and directed...