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July 5, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
a 40kg girl and a 30kg boy face each other on friction free roller skates. the boy pushes the girl,
Monday, May 19, 2014 by Leah

Physics
Calculate the equilibrium position of a third charge of 6.79 x 10^-9 C that is positioned between an 8 x 10^-9 C charge and a 12 x 10^-9 c charge.
Monday, May 19, 2014 by Sam

physics
Calculate the gravity on a planet using a pendulum that has a period of 2.45 s having a length of 1.25 m.
Monday, May 19, 2014 by Sam

Physics
2.0 kg weight is on simple, horizontally oscillation (in a spring) with the time 1.8 s. The distance between the outmost dots in the oscillation is 0.16 m. a) What is the angular speed (w) of the oscillation ? b) What is the force constant (k) of the spring? c) What is the ...
Monday, May 19, 2014 by Physics: Simple oscillation?

physics
if a train travell at speed of 90km/hour. and when the break applied at 5m/sec2. how much it will travel before stoping
Monday, May 19, 2014 by chhaya

physics
Suppose an object is placed at a distance x from a screen and a converging lens of focal length f is placed between the object and the screen. What is the minimum separation distance x (in terms of f) for a real image to be formed on the screen? Support your answer with either...
Monday, May 19, 2014 by Josh

Physics
What is the centre of mass if the mass of the earth is 81 times that of the moon and the distance between them is 384 Mm=60 rj ?
Monday, May 19, 2014 by Physics: centre of mass?

Physics
How long would the year be if the distince of the earth from the sun where 20% more?
Monday, May 19, 2014 by Physics: Law of gravity?

Physics
2.0 kg rock in a 0.80 ling sting is swung vertically in circles. a) What does the speed of the rock to be so the string holds tight? b) what is the pulling force if the speed is 5.0 m/s?
Monday, May 19, 2014 by Physics: Motion?

Physics
An object with mass 8.5kg is moving vertically upward with a velocity if 35m/s at a height of 100m above the ground. Find the time the object takes to reach the ground Thanks!!
Monday, May 19, 2014 by Meg

physics
two copper wires A and B are of the same length. If the diameter of A is 3 mm and its resistance is 3 ohms, what is the diameter of B if its resistance is 0.08 ohm ?
Monday, May 19, 2014 by yhojsgarcia

physics
An object 3.60 cm tall is placed 13.1 cm in front of a mirror, which creates an upright image that is 5.21 cm in height. a) What is the magnification of the image? b) What is the radius of curvature of the mirror? Answer in units of cm
Monday, May 19, 2014 by Jp

Physics
a point charge -q, mass m is flying up at the speed v(0)= v 0 from the distance x(0)=L from a uniformly and positively charged thin plate, its linear density equal p. determine the maximum distance of a particle from the plate
Monday, May 19, 2014 by David

physics
Why do the passengers in high-altitude jet planes feel the sensation of weight while passengers in the International Space Station do not?
Monday, May 19, 2014 by Peg

physics
A simple lever is used to lift a heavy load. When a 60-N force pushes one end of the lever down 1.2 m, the load rises 0.2 m. Show that the weight of the load is 360 N.
Monday, May 19, 2014 by Peg

physics
Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
Monday, May 19, 2014 by Peg

Physics
A 0.15kg baseball pitched at 30 m/s is hit on a horizontal line drive straight back at the pitcher at 46.0 m/s. If the contact time between bat and ball is 5x10^-3 s, calculate the force (assumed to be constant) between the ball and bat. [Hint: impulse!] I did FΔt = Δ...
Sunday, May 18, 2014 by Cat

Physics
Suppose the mass of the stick is 200 g, and a single 500-g mass is to play "solitary seesaw" at the 0-cm mark. Where should the fulcrum be located?
Sunday, May 18, 2014 by James Lee

physics
an electron in the second energy level absorbs a photon of energy 6 ev what's the speed of the ejected electron? I have tried to manipulate and use the kinetic energy equation, c= lamba x f, and many other ways, but I don't know why can't get the answer, which is v...
Sunday, May 18, 2014 by K

Physics
An airplane flies at 120 km/h takes a 20 degree turn on 30 seconds. a) What is the centripetal acceleration ? b) from where does it get it's centripetal acceleration ?
Sunday, May 18, 2014 by Physics: Centripetal acceleration?

Physics
A ball (m = 250g) on the end of string swings in 1.2 m radius that tolerates 20 N. At what speed does the string breaks if a) the rings swings horizontally ? b) the rings swing vertically? I think I got a) right: T=mv2/r ---> v=(sqr)Tr/m v=(sqr) 20x1.2/0.25= 9.8 m/s Given ...
Sunday, May 18, 2014 by Physics: Circular Motion?

Physics
A yo-yo is spun from rest by pulling on the string with a constant tension of 2.0 N. The radius of the inner rod on which the string is strung round is 0.50 cm. The tension is applied for 5.0 seconds after which the yo-yo is observed to spin with an angular velocity of 15 rad/...
Sunday, May 18, 2014 by Bob

physics
In an electric field an electron is kept freely. If the electron is replacee by a proton, what will be the relationship between the forces experienced by them?
Sunday, May 18, 2014 by savita

Physics
How can the more wind speed and force, results greater amount of power for the wind turbine?
Sunday, May 18, 2014 by Clarissa

Physics
Assuming zero drag, how long, in seconds, would it take a super ball to fall 25 feet? What would its velocity be at that point (in mph)?
Saturday, May 17, 2014 by Nancy

Physics
A car takes a turn with the radius of 150 m at the speed of 30m/s. a) Calculate the acceleration at 60 degree angle around the curve. the answer is 5.7m/s2, What formula do I use ?
Saturday, May 17, 2014 by Physics: Circular Motion?

physics
A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m...
Saturday, May 17, 2014 by joe

physics
A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m...
Saturday, May 17, 2014 by joe

physics
A girl throws a water-filled balloon at an angle of 50.0∘^\circ above the horizontal with a speed of 12.0m/s{\rm m}/{\rm s} . The horizontal component of the balloon's velocity is directed toward a car that is approaching the girl at a constant speed of 8.00m/s{\rm m...
Saturday, May 17, 2014 by joe

Physics
The distance between two successful crestof a water wave travelling at 3.6 m/s is 0.45m. Cal culate the frequency of the wave
Saturday, May 17, 2014 by Mercy

Physics
A wave sent out from a source is reflected back to the source in 1.9x10^-3 seconds .if the velocity of the wave is 3.0x10^8 m/s, the distance of the reflecting surface from the source is ?
Saturday, May 17, 2014 by Mercy

physics
A physics book slides off a horizontal tabletop with a speed of 1.10m/s{\rm m}/{\rm s} . It strikes the floor in 0.350s{\rm s} . Ignore air resistance.
Saturday, May 17, 2014 by joe

physics
A rocket of mass 100,000 kg undergoes an acceleration of 2 m/s2. Show that the net force acting on it is 200,000 N.
Saturday, May 17, 2014 by Peg

Science Physics
Sophia exerts a steady 40-N horizontal force on a 8-kg box resting on a lab bench. The box slides against a horizontal friction force of 24 N. Show that the box accelerates at 2 m/s2.
Saturday, May 17, 2014 by Peg

Science Physics
Madison pushes with a 160-N horizontal force on a 20-kg crate of coffee resting on a warehouse floor. The force of friction on the crate is 80 N. Show that the acceleration is 4 m/s2.
Saturday, May 17, 2014 by Peg

Physics
A ball rolls down a 1.00 m long and 0.40 m inclined plane and falls off down on the floor, 1.20 m. a) Calculate the speed of the ball when it falls of the plane and the speed in vertical and horizontal direction. b) Where does the ball land? c) At what speed and under what ...
Saturday, May 17, 2014 by Physics: A ball rolls down an inclined plane?

physics
A bike of wheel radius. 40 cm at its highest speed its meter show 300RPM.then evalute the speed of the bike on this reading
Saturday, May 17, 2014 by Rajesh

Physics
A car drives around a curve with radius 150 m at a speed of 30 m/s. What is the average acceleration at? a) 180 degrees. b) 60 degrees around the curve ? Given answers are:3.8 m/s2 and 5.7 m/s2 Help please :))
Saturday, May 17, 2014 by Physics: Motion ?

Physics
You are driving down the highway late one night at 20 m/s when a deer steps onto the road 35 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum deceleration of your car is 10 m/s2 . How much distance is between you and the deer when...
Friday, May 16, 2014 by Harvey

Physics
An object gets the acceleration 8.0 m/s2 in a vertical direction (y) but 5.0 m/s2 in a horizontal direction (x). What will be the position of the object at the time t=2.0 s if his initial postiotion was (0,0), initial speed in y-direction 0 and in x-direction 5.0 m/s? Given ...
Friday, May 16, 2014 by Physics: Motion in two dimensions?

Physics
The position of an object is described as x = 4.0t and y= 1.5t2 - 2t + 1.0. All factors are in SI-units. a) What is the begining velocity of the object? b) What is his acceleration? c) What is the direction along the x-axe at the time t=1.0 s ? Given answers are: 4.5 m/s in -...
Friday, May 16, 2014 by Physics: Motion in two dimensions?

physics
A table clock has its minute hand 4.0 cm long. find the average velocity of the tip of the minute hand (a) between 6am to 6.30am and (b) between 6am to 6.30pm
Friday, May 16, 2014 by harit

physics
2 particles ar moving with constant speed v such that they are always at a constant distance d apart and their velocities are always equal and opposite. After what time they return to their initial positions?
Friday, May 16, 2014 by harit

physics
A ball is projected horizontally from the top of a 98m high cliff with an initial speed of 14.4 m/s. Determine the magnitude of the final speed the instant prior to hitting the ground
Friday, May 16, 2014 by tenzin

physics
Determine the launch speed of a horizontally-launched projectile which lands 27.4 meters from the base of a 17.9-meter high cliff.
Friday, May 16, 2014 by tenzin

physics
A soccer ball is kicked horizontally at 16.1 m/s off the top of a field house and lands 37.5 metes from the base of the field house. Determine the height of the field house.
Friday, May 16, 2014 by tenzin

physics
john and paul are trying to move a 100kg piano which is resulting on a flat, smooth floor. John pushing towards the North, while Paul is pushing towards the East. Both are exerting a 100N force. What is acceleration of the piano (magnitude and direction)? A=200/100=2m/s^2 ...
Friday, May 16, 2014 by trish

physics
john and paul are trying to move a 100kg piano which is resulting on a flat, smooth floor. John pushing towards the North, while Paul is pushing towards the East. Both are exerting a 100N force. What is acceleration of the piano (magnitude and direction)? A=200/100=2m/s^2
Friday, May 16, 2014 by trish

physics
a pendulum is swinging back and forth once every 1.25 second, how much longer should the pendulum be to increase its period by 0.200 second
Friday, May 16, 2014 by sara

Physics
A 6.0kg box is on a frictionless 45∘ slope and is connected via a massless string over a massless, frictionless pulley to a hanging 2.4kg weight. What is the tension in the string if the 6.0kg box is held in place, so that it cannot move? If the box is then released, ...
Friday, May 16, 2014 by Physics Help

Physics
Two-thirds of the weight of a 1500kg car rests on the drive wheels. Assume that μs = 0.74. What is the maximum acceleration of this car on a concrete surface?
Friday, May 16, 2014 by Physics Student

physics
Soccer player #1 is 7.31 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled . If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive ...
Thursday, May 15, 2014 by chuck

Physics
A rescue team has to use a specially designed sling-shot to supply emergency medicine to a stranded hiker. The hiker's altitude above the ground is 320m and his horizontal distance from the launch site is 410m. The launching angle of the initial velocity is 68 degrees from...
Thursday, May 15, 2014 by Becky

physics
Soccer player #1 is 7.31 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled . If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive ...
Thursday, May 15, 2014 by chuck

Physics
Calculate the escape velocity of a satellite launched from the earth surface if the radius of the earth is 6.4x10^6m
Thursday, May 15, 2014 by Victor

Physics
Please help me go through this F = q1q2/r^2, i know this is the equation, but i dont know how to get the answer, please help. What is the electric force between a +2 µC point charge and a –2 µC point charge if they are separated by a distance of 5.0 cm? Show ...
Thursday, May 15, 2014 by Me and I

Physics
A police car is asked to overtake a red sedan that is 1.6 km ahead of it on the freeway. The red sedan is traveling at 80 km/hr and the police car travels at 100 km/hr. When will the police car overtake the sedan?
Thursday, May 15, 2014 by Cas

physics
croquet ball must have a set mass of 0.50 kg. a red ball moving at 10.0 m/s, strikes an at-rest green ball head on. The red ball continues moving at 1.5 m/s after it hits the green ball. What is the final speed of the green ball?
Thursday, May 15, 2014 by Jean

physics
Consider the observable M that corresponds to a measurement in the sign basis where the measurement value is 3 if the outcome is + and −2 if the outcome is −. Write M in the standard basis. If M is the Hamiltonian acting on a qubit which is in the state |ψ(0...
Thursday, May 15, 2014 by Sam

Physics
A person of mass 50.0 kg is at the bottom of a cave. The cave has a depth of 32.5 meters and the person is to be pulled out of the cave vertically by a rope, starting from rest. What is the shortest amount of time that this could take if the rope can withstand a maximum ...
Wednesday, May 14, 2014 by Tyler

st anthenis physics
A+B+C=0out of three vector two r equal in magnitudeand magnitude of third is root 2times that of eitherof two hsving equal magnitude.than angle beteen vectors r
Wednesday, May 14, 2014 by rashika

st francis physics
|AxB|=root 3A.B then A+B=
Wednesday, May 14, 2014 by rashika

Physics (acceleration)
1. Jasmine rode a horse down a path headed north. she started from rest and then accelerated at 0.5 m/s2 for 12 seconds and then travelled at a constant speed for 28 seconds. a.) what was her velocity after 12 seconds? b.) what was jasmines displacement after 10 seconds? c.) ...
Wednesday, May 14, 2014 by Samaira

physics
A square loop of wire of side 2.8 cm carries 3.0 A of current. A uniform magnetic field of magnitude 0.67 T makes an angle of 43° with the plane of the loop. (a) What is the magnitude of the torque on the loop? (b) What is the net magnetic force on the loop?
Tuesday, May 13, 2014 by caroline

Physics -- HELP PLEASE
. Water with a mass of 1000kg leaves a hose at 20oC and is converted by the heat from the fire into steam at 300oC. List the steps needed in order to determine the amount of heat that is added to the water. For each step show the formula that must be used and replace the ...
Tuesday, May 13, 2014 by Anonymous

physics
a disk of mass M and radius R is attached to a spring of constant k .the disk rolls back and forth without slipping. the angular frequency of the motion of the disk is
Tuesday, May 13, 2014 by kashyap

physics
water in a dam is 15 m deep. a horizontal pipe of 4 cm diameter passes through the wall of the dam below the surface of water. a plug secures the pipe opening. the frictional force between the plug and pipe wall is about?
Tuesday, May 13, 2014 by kashyap

physics
An airplane is 5,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis up.
Tuesday, May 13, 2014 by tabby

Physics
Water with a mass of 1000kg leaves a hose at 20oC and is converted by the heat from the fire into steam at 300oC. List the steps needed in order to determine the amount of heat that is added to the water. For each step show the formula that must be used and replace the ...
Tuesday, May 13, 2014 by Water Q-7

Physics
Water with a mass of 1000kg leaves a hose at 20oC and is converted by the heat from the fire into steam at 300oC. List the steps needed in order to determine the amount of heat that is added to the water. For each step show the formula that must be used and replace the ...
Tuesday, May 13, 2014 by Roller coaster Q-7

Physics
A roller-coaster car is moving at 20.0 m/s along a straight horizontal track. What is its speed after climbing a 15.0 m hill? Neglect the effects of friction.
Tuesday, May 13, 2014 by Roller coaster Q-6

Physics
The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo bay? B...
Tuesday, May 13, 2014 by Space Shuttle-Q1

Physics please help?????
Two small spaceships, each with mass m = 2000 kg, are in the circular Earth orbit of the figure, at an altitude h of 450 km. Igor, the commander of one of the ships, arrives at any fixed point in the orbit 90.0 s ahead of Picard, the commander of the other ship. At point P in ...
Tuesday, May 13, 2014 by Janis

Physics
A box of mass 1.50 kg is given an initial velocity of 12.5 m/s up an inclined ramp that makes an angle of 25.0o with the ground, which is horizontal. The coefficient of kinetic friction between the box and the ramp is 0.240. How long does the box slide up the ramp before it ...
Tuesday, May 13, 2014 by Tom

Physics
Two bicycle tires are set rolling with the same initial speed of 3.00m/s along a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40 psi and goes a distance of 18.1m ; the other is at 105 ...
Tuesday, May 13, 2014 by collegekid

Physics
A block is sitting on a rough ramp. It is found that a force of F = 200.0 N (directed up the ramp) is required to keep the box from sliding back down the ramp. The angle 𝜃 is 35.0o and the mass of the box is 150.0 kg. What is the coefficient of static friction between...
Tuesday, May 13, 2014 by Tom

Physics
A box of mass 1.50 kg is given an initial velocity of 12.5 m/s up an inclined ramp that makes an angle of 25.0o with the ground, which is horizontal. The coefficient of kinetic friction between the box and the ramp is 0.240. How long does the box slide up the ramp before it ...
Tuesday, May 13, 2014 by Tyler

physics
an electron is accelerated from rest through a potential difference V. If the electron reaches a speed of 9.11*x10^6 m/s, what is the potential difference?
Tuesday, May 13, 2014 by Rick

physics
It the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury, what is the total pressure of the gas supply in cm of water if the height of water is increase by 3cm?
Tuesday, May 13, 2014 by VICTOR

Physics
A 0.28 kg softball has a velocity of 16 m/s at an angle of 34° below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a velocity of (a) 21...
Tuesday, May 13, 2014 by John

physics
two large horizontal metal plates are separated by 4mm. the lower plate is at a potential of -6V. what potential should be applied to the upper plate to create electric field strength of 4000V/m upwards between the plate
Tuesday, May 13, 2014 by muhammed

physics
Oxygen diffuses from the surface of insects to the interior through tiny tubes called tracheae. An average trachea is about 2mm long and has cross-sectional area of 2×10−9m^2. Assuming the concentration of oxygen inside is half what it is outside in the atmosphere...
Tuesday, May 13, 2014 by Anonymous

physics
An aluminum can is filled to the brim with a liquid. The can and the liquid are heated so their temperatures change by the same amount. The can’s initial volume at 5 oC is 3.5×10−4​ m3. The coefficient of volume expansion for aluminum is 69&...
Tuesday, May 13, 2014 by Guadalupe

physics
What is the average linear speed of the Earth about the Sun? (The distance from the Sun to the Earth is 1.50 1011 meters. The orbital period around the Sun is 365.3 days.)
Monday, May 12, 2014 by caroline

physics
Two mirrors are placed at a 90° angle to each other. A light ray strikes one mirror 0.730 m from the intersection of the mirrors with an incident angle of 36.5°. The ray then travels a distance d before reflecting from the second mirror. (a) What is the distance d?
Monday, May 12, 2014 by Christina

Acceleration physics
1. A sprinter finishes the race with a velocity of 8.9 m/s. the sprinter accelerated to a stop at a rate of -2.7 m/s2. how long did it take the sprinter to come to a stop? 2. A cycllist starts from rest & reaches a velocity of 18 m/s southwest in 3.8 seconds. what was the ...
Monday, May 12, 2014 by Durga

Physics
The figure shows the velocity graph of a 79kg passenger in an elevator. The graph is (0,0),(1,4),(5,8),(9,2) What is the passenger's apparent weight at t=1s,5s,9s?
Monday, May 12, 2014 by Tom1

physics
a diverging lens of focal length 30cm creates an image 3cm tall from an object that is 9cm tall where is the image located if the object is 60cm from the lens. what is the magnification
Monday, May 12, 2014 by diane

physics
In a classroom demonstration, a 790-N physics professor lies on a “bed of nails.” The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the professor is lying ...
Monday, May 12, 2014 by ashey

Physics
In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x ...
Sunday, May 11, 2014 by Kate

Physics
A horizontal rope is tied to a 45.0kg box on frictionless ice. What is the tension in the rope if: A) The box is at rest? B) The box moves at a steady vx = 4.40m/s ? C) The box vx = 4.40m/s and ax = 4.60m/s2 ?
Sunday, May 11, 2014 by TlP

Physics
Sam, whose mass is 76kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 220N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 15s . How far has Sam traveled when he finally coasts to a stop?
Sunday, May 11, 2014 by TP

Physics
Bob is pulling a 30kg filing cabinet with a force of 200N , but the filing cabinet refuses to move. The coefficient of static friction between the filing cabinet and the floor is 0.80. What is the magnitude of the friction force on the filing cabinet? Express your answer to ...
Sunday, May 11, 2014 by T

Physics HELP!!!!!!!!
Suppose 0.021 mole of an ideal monatomic gas has a pressure of 1.00 atm at 273.15 K and is then cooled at constant pressure until its volume is reduced by 41.1 %. What is the amount of work done by the gas?
Sunday, May 11, 2014 by suzan

Physics
A ball with a mass of 12 g is moving at 15 m/s. It collides with a second ball with a mass of 36 g moving at 5 m/s in the same direction. After the collision, the 12-g ball moves at 6.0 m/s. How great is the change in momentum of the z36-g ball?
Sunday, May 11, 2014 by Ali

physics
A car moves along an x axis through a distance of 900 m, starting at rest (at x = 0) and ending at rest (at x = 900 m). Through the first ¼ of that distance, its acceleration is +2.25 m/s2 . Through the rest of that distance, its acceleration is – 0.750 m/s2 . Find...
Sunday, May 11, 2014 by Anonymous

physics
24 joule work is done in moving a charge of 6c between two points. Calculate potential difference between this two points.
Sunday, May 11, 2014 by Jatindra Deori

Physics
design a pair of ear defenders and explain how they work using big idea of energy transfer
Sunday, May 11, 2014 by Jean Smith

Physics
A cyclist starts from rest and coasts down a 6.5∘{\rm ^\circ} hill. The mass of the cyclist plus bicycle is 95kg{\rm kg} . The cyclist has traveled 270m{\rm m} .What was the net work done by gravity on the cyclist? How fast is the cyclist going? Ignore air resistance.
Saturday, May 10, 2014 by Anonymous

physics- answers check
5. A magnetic field map shows a. the direction of the magnetic field. b. a few representational field lines. c. relative strength of the magnetic field. d. All of these choices are correct. my answer: d 6. Magnetic field lines a. can cross each other when the field is strong. ...
Saturday, May 10, 2014 by Liz

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