Net Definition and 1000 Threads

Homework Statement Right after clearing the launch tower, the space shuttle is accelerating upward at 6 m/s/s. a) Calculate the net force on an 80 kg astronaut during this acceleration. b) Calculate the force that the seat must exert on the 80 kg astronaut during this acceleration. c) A...

Two rockets are launched. Rocket A has a mass of 1656.4 kg and a velocity of 5.0 m/s at an angle of 15.9 degrees measured off of the positive horizontal axis. Rocket B has a mass of 1318.7 kg and a velocity of 960.8 m/s at an angle of 42.5 degrees measured off of the positive horizontal axis...

Here is the problem I have: 1. A 800 kg rocket sled can be accelerated at a constant rate from rest to 1500 km/h in 2.1 s. What is the magnitude of the required net force? First I converted the a from 1500 km/h to 416.7 m/s I then used F=ma but I got the result as 333360 N but this answer is...

Homework Statement A 1700kg car drives around a flat 220m -diameter circular track at 24m/s . Homework Equations What is the magnitude of the net force on the car? The Attempt at a Solution 1700 * (24^2)/(110^2) i got 80.92561983 round to two sig-figs so 81 and idk why

These are practice problems (not hw) that I'm trying to work on, if anyone could help me out, thanks! I'm trying to find the net, ionic and molecular eq. 1)CaCO2+HCl=CaCl2+CO2(g)+H2O I just know that CO2 AND H2O doesn't break down because it's a gas and liquid. 2)NaHCO3+HBr=NaBr+CO2(g)+H2O

Find the net force (in Newtons) required to accelerate a 110 kg bike and rider from rest to a final velocity of 22.7 m/s in 10 seconds? since f=ma 110(22.7)=2497 do I divide that by 10 seconds??

Homework Statement Find the magnitude of net force on the following object a 725 gram block that is accelerating at 8.10 m/s2 at an angle of 18.0 degree relative to horizontal. Homework Equations F=m*a The Attempt at a Solution I first converted the 725 grams to kilograms but then...

How do you find magnitude of net force given mass, angle, and acceleration? I have a mass of 725 kg, an acceleration of 5.10 m/s squared and an angle of 14.0 degrees. The only equation I'm given is F=M*A but I don't know how to apply it when I have an angle as well.

Homework Statement Homework Equations The Attempt at a Solution a) Fnet=(2250cos(35)) * 2 - 1250 Fnet=+593 N [E] b) I have solved part a, but I don't understand how to approach part b.

Hey guys I am using some simulation tools and wondering what is an electrical net? google didnt help:D

Homework Statement What net electric field do the particles of problem #1 produce at the square's center? Problem number one has a square with edge lengths of 24.00cm and charges of q1==8.0e-6C, q2=-8.0e-6C, q3=-8.0e-6, and q4=+8.0. He wants the answer for the electric field in component...

2 Particles are fixed to an x-axis: q1=2.1*10^-8 C @ x=.2m q2=-4.00q1 @ x=.7m We are trying to find the coordinate on the x-axis where the net electric field produced by the particles = 0. The equation I have is E=((8.99*10^9)q)/r^2 I got what i thought was q2 first, by multiplying...

Homework Statement So the question is: Enter the net ionic equation for the reaction of aqueous sodium chloride with aqueous silver nitrate. Homework Equations So i know that the first part of the equation is: Na(ClO2)aq+Ag(NO3)aq --> i have no clue what should go here. Please...

Homework Statement A spaceship lifts off vertically from the Moon, where g = 1.6 m/s2. If the ship has an upward acceleration of 1.0 m/s2 as it lifts off, what is the magnitude of the force exerted by the ship on its pilot, who weighs 735 N on Earth? From Halliday, Fundamentals of Physics...

Homework Statement The position r as a function of time of a 15.0 kg mass, moving in the x-y plane, is given by r(t) = (6.00t^3 x + 1.20t^4 y) meters where x and y are unit vectors. At t = 5.00 s, find the magnitude and direction of the net force vector which is causing this acceleration...

[b]1.The position vector of a 3000N helicopter is given by: r=(.02 m/(s^3))(t^3)i + (2.2m/s)tj - (0.06 m/(s^2))(t^2)k Find the net force on the helicopter at t = 5s. [b]2. I really have no clue where to begin. [b]3. I started doing this: r=...

Homework Statement Find Tension T and w2 in each cable in diagram. Diagram: http://i52.tinypic.com/8z33ub.jpg (i drew this in paint, sorry if it looks bad)Homework Equations only basic algebra is neededThe Attempt at a Solution To find T and w2 i need to find angle Alpha but i cannot seem to...

Homework Statement A point charge +5q is located at the origin, and a point charge –3q is located on the x-axis at D = 0.361 m. At what location on the x-axis will a third charge, q0, experience no net force from the other two charges? Homework Equations F = k * (q1q2/r^2)...

Hi all, Just studying the early life of the Universe so here is what I know that I think is relevant to my question - protons were built from the imbalance of quark/anti-quark annihilation and a matching number of electrons were left over after lepton/anti-lepton annihilation imbalance...

Homework Statement A rope forms a Y. At the end of the Y hangs a block with a W= 100N Whole the two upper ends are on the walls. (Left side) T{1} with an angle of 90 degrees (Right side) T{2} with an angle of 58 degrees Find the tension of each rope on the wall. Homework Equations No definite...

When you have a line of 4 boxes without gaps between adjacent boxes, and all of them are at rest, what exact forces are involved when a rightward force is applied to the leftmost box to cause it to move straight into the other boxes? To make this easier, let's assume no gravity, friction, or...

Homework Statement An old 33 1/3 rpm turntable may be approximated by a cylindrical disk of mass 0.250kg and a diameter of 31.0cm. a.) What average torque will bring it up to operating speed in 1.50 seconds starting from rest? b.) what net work is done on the disk in bringing it up...

Homework Statement A man picks up a 10kg box, and holds it at a height of 1m above the horizontal ground as he walks to a ramp, and then carries the box up the ramp to a height of 4m, and then down the ramp as shown, finally placing it on the ground at F. Describe the work done at each...

Homework Statement A shopper in a supermarket pushes a cart with a force of 39 N directed at an angle of 25° below the horizontal. The force is just sufficient to overcome various frictional forces, so the cart moves at constant speed. (a) Find the work done by the shopper as she moves down...

I'm working through Advanced Calculus: A Differential Forms Approach at my leisure. In going over two-forms the notions of "flow across an area" and "oriented area" are introduced I hit a brick wall with grasping orientations, though, when asked to find the total flow into a tetrahedron. So...

Homework Statement The two forces F1 and F2 (shown in the figure) (i attached the figure hopefully I did it correctly) act on a 27.0 kg object on a frictionless tabletop. If F1=10.2N and F2= 16.0N, find the net force on the object and its acceleration for a and b Homework Equations...

Homework Statement A block with mass m1=2.00kg is on a flat surface and a block of mass m2=6.00kg is on an incline and they are connected by a massless string over a pulley in the shape of a solid disk with a radius R=0.250m and mass M=10.0kg. The angle of the incline is \Theta=30o and the...

Homework Statement A person with a mass of 80.6 kg jumps from a squat position into the air. The velocity at the beginning of the jump is zero. Fast motion video analysis reveals that the velocity of the centre of mass at take-off was 5.3 ms-1. Foot contact time when the ground reaction...

If I have two different charges and I'm told to calculate net force, do I just use F=KQ1Q2/r^2 or Fnet=F1+F2... Please explain.

Homework Statement At what distance from the Earth will a spacecraft traveling directly from the Earth to the Moon experience zero net force because the Earth and Moon pull with equal and opposite forces? Homework Equations GM(earth)/(R-d)^2=GM(moon)/d^2 The Attempt at a Solution...

A 10 kg sled is pulled at 35 degrees east of north with 100 N. There is a force of 150 N due east. And a friction force of 50 N. What is the acceleration of the sled, and its direction? So I basically added up all the forces in the x direction, and the y direction, and used the pythagorean...

Imagine a low-mass object between two massive objects. Their configuration is such that the low-mass object does not move due to the gravity of the two massive objects. Since the gravity is canceled for the low-mass object, is the time dilation canceled as well for the low-mass object...

Homework Statement Four charges are located at the corners of a square as shown below. Calculate the magnitude and direction of the net force on charge -3Q and charge 4Q. (sorry don't have picture, but it is of a square with corners -Q, 2Q, -3Q, and 4Q clockwise). Homework...

Homework Statement A naked person, whose skin area is 1.7 m2, sits in a sauna that has a wall temperature of 61oC. If the person’s skin temperature is 37oC, find the net rate at which the person absorbs heat by radiative transfer (assume an emissivity e of 1). How much liquid must the...

I'm having trouble understanding these kinda questions. I'm assuming this kinda thing applies to all types of force when there's 3 objects exerting the force so its fairly important to know. Let's say I have 3 charges of 11x10-6C that make up an equilateral triangle...

Homework Statement 2. The attempt at a solution I integrated the velocity equation and got this: s(t)= sin(t) + (1/2)x 1. [sin(pi)+(1/2)(pi)] - [sin(0)+(1/2)(0)] = pi/2 2. [sin(pi)+(1/2)(pi)] + [sin(0)+(1/2)(0)] = pi/2 The first answer is right but the second one isn't

If I have a gear system that consist of 2 gears that are meshed together the first has 16 teeth which is the driver and the 2nd has 36 teeths which is the follower, power transmitted by the driver equal to 5 kw and the driver is rotating at 30 rps and has a known diameter, the usual way to...

Homework Statement The pulley in the figure has radius 13.0 cm and a moment of inertia 0.230 kg m^2; the pulley is constructed from a dense metal. The rope does not slip on the pulley rim. The system is released from rest...

Homework Statement A one-piece cylinder has a core section protruding from the larger drum and is free to rotate around its central axis. A rope wrapped around the drum of radius 1.14 m exerts a force of 4.41 N to the right on the cylinder. A rope wrapped around the core of radius 0.54 m...

Homework Statement Each R = 2.8Kohms. Find net resistance. Please see attached picture. Homework Equations The Attempt at a Solution

Is the only purpose of net ionic equations to see which elements were oxidized or reduced? Or is there another reason why it is useful?

Homework Statement show that the charge distribution (|\vec{r}|\equiv r ) \rho(r) = Z\delta^3(\vec{r})-\frac{Ze^{-r/R}}{4\pi R^2r} has zero net charge for any Z and R. Explain the meaning of Z. Homework Equations none given, but divergence (gauss) theorem and poisson's equation may...

Homework Statement A boy of mass 60.0 kg is rescued from a hotel fire by leaping into a firefighter's net. The window from which he leapt was 8.0 m above the net. The firefighters lower their arms as he lands in the net so that he is brought to a complete stop in a time of 0.40 s. 1.What is...

Homework Statement Imagine two spherical planets fixed on the x-axis, one with mass M at the origin, and the other with identical mass M at the position x = +d. (Assume that d is much greater than the radius of either planet.) At what position along the x-axis between the two masses could you...

Homework Statement The masses and coordinates of three particles are as follows: 20.0 kg, (0.50, 1.00) m; 432.0 kg, (-1.00, -1.00) m; 71.0 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...

Homework Statement A sample of an ideal gas is taken through the thermodynamic cycle shown on the P-V diagram at attached. Two of the “legs” of the cycle are isobaric and the other two are isothermal. a) Find the net work done by the gas along the high pressure isobaric leg in terms...

Homework Statement A 1200 kg pickup truck tows a small 300 kg trailer using a relatively lightweight tow rope. The position of the trailer is given in m and time in s. *There is an animation which shows the truck pulling the trailer across X-axis. Given: x= -20; y= +1 **BTW, i don't know...

Homework Statement A child drags a 20kg box across a lawn for 10m anfd along a sidewalk for 30m; the coefficient of friction is 0.25 for the first part of the trip and 0.55 for the second part. If the child always pulls horizontally, how much work does the child do on the box...

A 22 g bullet is fired from a rifle. It takes 2.55 10^-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 730 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet m=22g is a=0 ? since its...

The circular blade on a radial arm saw is turning at 265 rad/s at the instant the motor is turned off. In 12.0 s the speed of the blade is reduced to 85 rad/s. Assume the blade to be a uniform solid disk of radius 0.140 m and mass 0.400 kg. Find the net torque applied to the blade. Relevant...