Daniela

I am doing a research paper on Fitness Companies and I can't find any Real Information on L.A. Fitness. Can anyone tell me why? and where to find these numbers I am looking for?

PLEASE Help me!!!!!

I have had problems with my windows laptop for a while. Recently though, I have been receiving these blue screens that force me to shut down my computer. I'm trying to find the absolute best way to fix my computer. :/ someone please help me.

A 7.0-cm-long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.31 ohms. Pulling the wire with a force of 1.3 N causes 4.5 W of power to be dissipated in the circuit.

What is the speed of the wire when pulled with 1.3 N?

What is the strength of the magnetic field?

I have been at this question for about half an hour now... can somebody please help me figure it out? Please. Thank You!

An electromagnetic flowmeter applies a magnetic field of 0.20 T to blood flowing through a coronary artery at a speed of 15 cm/s. What force is felt by a chlorine ion with a single negative charge?

Please Help get me started!

you're given 1.1 g of copper and asked to make a wire, using all the metal, with a resistance of 2.0 Omega. Copper has a density of 8900 kg/m^3.

What length will you choose for your wire? in meters

What diameter will you choose for your wire? in mm

I started out using Volume=mass/density

then used Volume= (4/3) pi r^3 to find the radius.

I hope I started it right.

I got my diameter to be .00618 mm but it's wrong.

I got my length to be 3559.52 m using R=p(L/A)

but it is also wrong... Can Someone please help me!

The starter motor of a car engine draws a current of 100 A from the battery. The copper wire to the motor is 5.0 mm in diameter and 1.0 m long. The starter motor runs for 0.70 s until the car engine starts.

How much charge passes through the starter motor?

I'm stuck-- :-(

I used the R=p(L/A) equation and i know i need to use the I=Q/t equation.

and i used p for copper= 1.68*10^ -8

Please help. Thank you!

Two 2.0 cm x 2.0 cm square aluminum electrodes, spaced 0.70 mm apart are connected to a 100 V battery.

What is the capacitance?

What is the charge on the positive electrode?

Two point charges 2.0 cm apart have an electric potential energy -270 uJ. The total charge is 10 nC.

What is the lesser charge?

q=______ nC

What is the larger charge?

q= _______nC

I really just need the equation i need to use. someone please help me with the first couple of steps! thank you so much.

If one charge is +0.44 nC, what is the other charge?

the graph shows on the x-axis 0 to 10 r (cm)

and on the y-axis 0 to -8 U{elec} (uJ)

and the graph line curves like an r from the -8 (on the y) to the 10 (on the x-axis)

I don't know how to read the graph to get the other charge. Please help.

A parallel-plate capacitor is formed from two 1.0 cm x 1.0 cm electrodes spaced 2.9 mm apart. The electric field strength inside the capacitor is 1.0x10^6 N/C. What is the charge (in nC) on positive electrode?

Which equation do I use? :-/

An electric dipole is formed from +- 3.0 nC point charges spaced 2.0 mm apart. The dipole is centered at the origin, oriented along the y-axis. What is the electric field strength at point (x,y) = (13 cm, 0 cm)?

Please help.. I keep getting the wrong answer.

A 8.0×10−2 g plastic bead is charged by the addition of 1.0 x10^10 excess electrons. What electric field E (strength) will cause the bead to hang suspended in the air?

A bead with a mass of 0.020 g and a charge of 10 nC is free to slide on a vertical rod. At the base of the rod is a fixed 20 nC charge. In equilibrium, at what height above the fixed charge does the bead rest?

A bead with a mass of 0.020 and a charge of 10 is free to slide on a vertical rod. At the base of the rod is a fixed 20 charge. In equilibrium, at what height above the fixed charge does the bead rest?

Please show work.. thank you :)

Coulomb's law for the magnitude of the force F between two particles with charges Q and Q' separated by a distance d is

|F|=K( |QQ'| /d^2)

where K=8.854 x 10^-12 C^2/(Nxm^2) is the permittivity of free space.

Consider two point charges located on the x axis: one charge, Q1 = -12.0 nC , is located at x1 = -1.705m ; the second charge, Q2 = 36.5 nC, is at the origin (x=0.0000).

What is the net force exerted by these two charges on a third charge Q3 = 55.0 nC placed between Q1 and Q2 at x3 = -1.155 m?

Your answer may be positive or negative, depending on the direction of the force.

Force on Q3= N

And if you could please explain how to do this problem, I would very much appreciate it! Thank You!

a glass rod has been charged to +14.0 nC touches a metal sphere. afterwards, the rod's charge is +6 nC. How many charged particles were transferred?

N=

Please help me out with work shown too please.

A small metal bead, labeled A, has a charge of 49 nC. It is touced to metal bead B, initially neutral, so that the two beads share the 49 nC charge, but not necessarily equally. When the two beads are then placed 5 cm apart, the force between them is 1.9x10^-3 N. Assume that A has a greater charge.

A.) What is the charge Qa on the bead?

B.) What is the charge Qb on the bead?

A 10 kg runaway grocery cart runs into a spring with spring constant 250 N/m and compresses it by 65cm.

What was the speed of the cart just before it hit the spring?