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July 25, 2014

July 25, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

give as many characteristics as you can of a bicycle pump
*Thursday, June 13, 2013 at 2:19pm*

**physics**

give as many characteristics as you can of a bicycle pump
*Thursday, June 13, 2013 at 2:15pm*

**physics**

give as many characteristics as you can of a bicycle pump
*Thursday, June 13, 2013 at 2:15pm*

**Physics**

What is the smallest radius of an unbanked (flat) track around which a motorcyclist can travel if her speed is 25 km/h and the coefficient of static friction between the tires and road is 0.28?
*Thursday, June 13, 2013 at 11:42am*

**Physics**

An object is dropped from a platform 100 feet high. Ignoring wind resistance, what will its speed be when it reaches the ground?
*Thursday, June 13, 2013 at 10:26am*

**Physics**

A ball is thrown horizontally at 20 m/s from the top of a cliff 50 meters high. How far from the base of the cliff does the ball strike the ground?
*Thursday, June 13, 2013 at 10:13am*

**Physics**

A rocket blasts off. In 10.0 seconds it is at 10,000 ft, traveling at 3600 mph. Assuming the direction is up, calculate the acceleration.
*Thursday, June 13, 2013 at 10:11am*

**Physics**

While traveling south on an expressway, a car traveling 60 mph (miles per hour) slows down to 30 mph in 12 minutes due to traffic conditions. Calculate the acceleration.
*Thursday, June 13, 2013 at 9:57am*

**Physics**

When u type on a computer keyboard, do u do work on the computer keys? Pleasee explain
*Thursday, June 13, 2013 at 9:31am*

**Physics**

City B is northwest of City A, and the 400 mile trip by car takes 8 hours. The cities are 320 miles apart if able to travel in a straight line. What is the speed of a trip from City A to City B?
*Thursday, June 13, 2013 at 9:23am*

**Physics**

If the odometer on the car reads 25.0 km at the beginning of a trip and 65.0 km a half hour later, what is the average speed of the car? (Remember significant digits.)
*Thursday, June 13, 2013 at 9:18am*

**Physics**

A car travels 30 km north in 25 min. and 40 km east in 35 min. What is the total distance traveled?
*Thursday, June 13, 2013 at 9:11am*

**physics**

The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is polar coordinates (r,&#...
*Thursday, June 13, 2013 at 5:36am*

**physics**

If you watch little kids try to open doors, they will often just push anywhere on the door, rather than on the edge like adults do. This is because they don't understand that it's easier to open a door if you push on the edge. But how much easier? Consider the ...
*Thursday, June 13, 2013 at 5:35am*

**Physics**

Two fixed, non-conductive, isolated rings of radii 25 cm are electrified and brought close to each other so that they are parallel. The distance between them is 1 m. You know that one of them has a charge of 1 nC(Nano Coulomb) evenly distributed on it, but you are not sure ...
*Thursday, June 13, 2013 at 4:45am*

**physics**

The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is polar coordinates (r,&#...
*Thursday, June 13, 2013 at 3:52am*

**physics**

If you watch little kids try to open doors, they will often just push anywhere on the door, rather than on the edge like adults do. This is because they don't understand that it's easier to open a door if you push on the edge. But how much easier? Consider the ...
*Thursday, June 13, 2013 at 1:53am*

**physics**

The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is polar coordinates (r,&#...
*Thursday, June 13, 2013 at 1:53am*

**Physics**

Light of intensity 2 Wm^–2 is traveling through air (n = 1.0) is normally incident on a dielectric surface. If the intensity of the reflected light is 0.3 W m^–2 what is the refractive index of the dielectric material?
*Thursday, June 13, 2013 at 1:29am*

**physics**

why weight of gold varies at 2 different places like panna and ladakh (physics)
*Wednesday, June 12, 2013 at 11:58pm*

**Physics**

A disk in your computer spins at 5400 rpm. If this disk turns through 12 revolutions before coming to stop, find the disks angular velocity acceleration. Also find the time it takes to stop.
*Wednesday, June 12, 2013 at 11:05pm*

**physics**

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to (1pts)
*Wednesday, June 12, 2013 at 10:10pm*

**physics**

a 0.055kg tennis ball approaches a tennis racket at 25m/s, stays in contact with it for 0.010s, is reversed in direction leaves the racket at 40m/s. what is the avg force between the racket and ball?
*Wednesday, June 12, 2013 at 3:57pm*

**physics**

How will changing charge change the equipotential at a distance of 2 meters? I honestly just don't even know where to start with this. If someone could at least point me in the right direction, that would be great!
*Wednesday, June 12, 2013 at 3:12pm*

**physics**

the speed of a wave on a string is 150m/s when the tention is 120n the percentage increase in the tension in order to rise the wave speed by 20% is
*Wednesday, June 12, 2013 at 12:21pm*

**physics**

the speed of a wave on a string is 150m/s when the tention is 120n the percentage increase in the tension in order to rise the wave speed by 20% is
*Wednesday, June 12, 2013 at 11:37am*

**physics**

True or false. Electric energy is transferred from generating stations to consumers' premises at extremely low voltage?
*Wednesday, June 12, 2013 at 10:31am*

**Physics**

To reach city A, you travel north for 2.00 hours covering 80.0 miles. You then turn due east and travel 45.0 minutes for another 20.0 miles to reach your destination. On the first leg of your trip (traveling north), what is your speed?
*Wednesday, June 12, 2013 at 9:47am*

**Physics**

A caterpillar climbs up a one-meter wall. For every 2 cm it climbs up, it slides down 1 cm. It takes 10 minutes for the caterpillar to climb to the top. What is the distance traveled? (Round the number to the nearest hundred.) >How do you calculate this? I'm confused...
*Wednesday, June 12, 2013 at 9:26am*

**Physics plz **

Do any teacher here have an email plz becouse I want to send some pictures for question ,,, physics plz or how can I attach picture here ????
*Wednesday, June 12, 2013 at 5:45am*

**physics**

The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is polar coordinates (r,&#...
*Wednesday, June 12, 2013 at 1:55am*

**physics**

If you watch little kids try to open doors, they will often just push anywhere on the door, rather than on the edge like adults do. This is because they don't understand that it's easier to open a door if you push on the edge. But how much easier? Consider the ...
*Wednesday, June 12, 2013 at 1:54am*

**Physics**

While Driving Around A Curve Of 200 M Radius, You Notice That The fuzzy dice Hanging From The Rear-view Mirror Hangs At An Angle Of 15 Degree To The Vertical. 1.) What is the force diagram for the dice? 2.) What are the equations of motion in the horizontal and vertical ...
*Tuesday, June 11, 2013 at 7:49pm*

**physics**

Calculate the acceleration of the electrons enter the plates.Which are two parallel metal plates 12 mm apart, An electric field is produced between the plates, with the top plate held at a potential of 120 V and the lower plate earthed.
*Tuesday, June 11, 2013 at 6:55pm*

**Physics**

2.- A 2inx4inx8ft is leaning against the wall, draw afree-body diagram of forces on it. Give an expression throughdetailed steps using the diagram what would be the minimum angle ofthe wooden bar with the floor so it won’t slide.
*Tuesday, June 11, 2013 at 4:17pm*

**Physics**

At what distance should an object be placed in front of a convex lens of focal length 20 cm to obtain an image of double its size
*Tuesday, June 11, 2013 at 3:19pm*

**Physics**

a 100 gram bullet is fired from a 10 kg gun with a speed of 1000m/sec. what is speed of recoil
*Tuesday, June 11, 2013 at 3:17pm*

**Physics**

Find the projection of vector A=i-2j+k onto the direction of vector B=4i-4j+7k
*Tuesday, June 11, 2013 at 3:14pm*

**Physics**

Green light of 540 nm is diffracted by a grating of 200lines/mm. calculate the angular deviation of 3rd order image. is 10th order possible?
*Tuesday, June 11, 2013 at 3:12pm*

**Physics**

A 1m long string having mass of 4 gm is stretched by a force of 78.4N. calculate the frequency of the fundamental mode of vibration and the mass by which the string was stretched at its one end.
*Tuesday, June 11, 2013 at 3:11pm*

**Physics**

Suppose you walk 18.0m straight west and then 25.0 m straight north. How far are you from your starting point and what is the compass direction of a line connecting your starting point to your final position>
*Tuesday, June 11, 2013 at 1:11pm*

**Physics**

what is the physics theories behind putting 500 rubber bands on a watermelon until it explodes? I know there would be at least 2. The compression of rubber bands and Water not being able to compress. I need help with more explanation. what are the name of the law's behind ...
*Tuesday, June 11, 2013 at 12:42pm*

**Physics**

You and a friend are going to ride on a Ferris wheel. For a little extra fun, when your friend is at the very top of the Ferris wheel she's going to drop a tennis ball. How far around the Ferris wheel in radians from your friend should you sit so you can catch the ball? ...
*Tuesday, June 11, 2013 at 12:23pm*

**Physics**

If an object on Pluto has a mass of 10 kg and a weight of 6.6 N, what is the acceleration due to gravity at its location?
*Tuesday, June 11, 2013 at 11:23am*

**physics**

a balloon is rising up with an acceleration of 25meter per second a body is dropped from the balloon when its upward velocity is 300meter per second. what are there values of velocity and acceleration of the body at the instant it is dropped?
*Tuesday, June 11, 2013 at 11:19am*

**physics**

on turning a corner a motorcyclist rushing at 44 meter per second. find a child on the road 100m away. he applies the brake so as to stop motorcycle within 1m of the child. calculate the time required to stop?
*Tuesday, June 11, 2013 at 11:03am*

**Physics websites**

I just want to ask if there's a website in physics that you don't have to do the experiment on your own and you can just do it in the computer and study it and answer the question to that experiment/lab. I'm really having problems with my experiments and I don'...
*Tuesday, June 11, 2013 at 10:19am*

**physics**

A large rock is dropped from a plane flying horizontally at an altitude of 4.00 x 10 ^3 ( to the power of 3) and with a speed of 900km h. a) calculate the distance that the rock will move horizontally before hitting the ground b) find the velocity of the rock just before it ...
*Tuesday, June 11, 2013 at 6:50am*

**physics**

If you watch little kids try to open doors, they will often just push anywhere on the door, rather than on the edge like adults do. This is because they don't understand that it's easier to open a door if you push on the edge. But how much easier? Consider the ...
*Tuesday, June 11, 2013 at 3:09am*

**physics**

Tarzan is often portrayed as swinging through the jungle from vine to vine. Each of Tarzan's vines are 30 meters long and Tarzan catches each vine when it is at rest 15 degrees to the left of the (downwards) vertical, swings on it until it stops at an angle of 15 degrees ...
*Tuesday, June 11, 2013 at 3:08am*

**physics**

The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is polar coordinates (r,&#...
*Tuesday, June 11, 2013 at 3:00am*

**physics**

The most convenient way to express vectors in the two dimensional plane is in the familiar (x,y) Cartesian coordinates. However, one can express vectors in other coordinate systems as well. For example, another useful coordinate system for the plane is polar coordinates (r,&#...
*Monday, June 10, 2013 at 11:17pm*

**Physics**

Staging in mechanical equilibrium. The person in the middle weighs 215 N, and the tensions in each rope are 200 N. What is the weight of the staging?
*Monday, June 10, 2013 at 10:37pm*

**Physics 1**

A body of mass 6kg moving at 8m/s collides with a stationary body of mass 10kg and sticks to it. Find the speed of the composite body immediately after the impact.
*Monday, June 10, 2013 at 10:22pm*

**Physics**

scroll all the way to the bottom: lakeheadschools.ca/scvi_staff/brecka/Gr11_physics_web/downloadable_content/unit12/Text12/phys11_12_6.pdf How do you figure out which way the motor will spin (figure 12)? And how do you figure out which way the loop will rotate? ...
*Monday, June 10, 2013 at 6:58pm*

**Physics**

Scroll all the way to the bottom in the link I'll provide below and there will be diagrams for which my questions/answers are based on. I'm having trouble applying the "right hand rule" to 1. c) Also, for 1.a) I think the magnetic field lines should go around...
*Monday, June 10, 2013 at 6:31pm*

**physics**

A 84 g ball is fastened to one end of a string 52 cm long and the other end is held fixed at point O so that the string makes an angle of 23 with the vertical, as in the figure. This angle remains constant as the ball rotates in a horizontal circle. The angle would ...
*Monday, June 10, 2013 at 2:22pm*

**physics**

a train starts from rest and accelerates unifotmly, until it has travled 3.7 km and acquired a velocity of 30 m/s. the train then moves at a constant velocity of 30 m/s for 410 s. the train then slows down uniformly at 0.065 m/s^2, until it reaches a halt. what distance does ...
*Monday, June 10, 2013 at 12:59pm*

**physics**

a train starts from rest and accelerates unifotmly, until it has travled 3.7 km and acquired a velocity of 30 m/s. the train then moves at a constant velocity of 30 m/s for 410 s. the train then slows down uniformly at 0.065 m/s^2, until it reaches a halt. what distance does ...
*Monday, June 10, 2013 at 12:59pm*

**physics**

a train starts from rest and accelerates unifotmly, until it has travled 3.7 km and acquired a velocity of 30 m/s. the train then moves at a constant velocity of 30 m/s for 410 s. the train then slows down uniformly at 0.065 m/s^2, until it reaches a halt. what distance does ...
*Monday, June 10, 2013 at 12:57pm*

**physics**

a train starts from rest and accelerates unifotmly, until it has travled 3.7 km and acquired a velocity of 30 m/s. the train then moves at a constant velocity of 30 m/s for 410 s. the train then slows down uniformly at 0.065 m/s^2, until it reaches a halt. what distance does ...
*Monday, June 10, 2013 at 12:57pm*

**physics**

a train starts from rest and accelerates unifotmly, until it has travled 3.7 km and acquired a velocity of 30 m/s. the train then moves at a constant velocity of 30 m/s for 410 s. the train then slows down uniformly at 0.065 m/s^2, until it reaches a halt. what distance does ...
*Monday, June 10, 2013 at 12:57pm*

**physics**

a train starts from rest and accelerates unifotmly, until it has travled 3.7 km and acquired a velocity of 30 m/s. the train then moves at a constant velocity of 30 m/s for 410 s. the train then slows down uniformly at 0.065 m/s^2, until it reaches a halt. what distance does ...
*Monday, June 10, 2013 at 12:57pm*

**physics**

a train starts from rest and accelerates unifotmly, until it has travled 3.7 km and acquired a velocity of 30 m/s. the train then moves at a constant velocity of 30 m/s for 410 s. the train then slows down uniformly at 0.065 m/s^2, until it reaches a halt. what distance does ...
*Monday, June 10, 2013 at 12:57pm*

**Physics**

A car travels from City A to City B to the north. It takes 4 hours, and the road mileage is 200 miles. The map shows that the cities are only 80 miles apart (straight-line distance). Calculate the average velocity and give the direction. :(
*Monday, June 10, 2013 at 11:14am*

**physics**

1.descibe the construction and working of machine used to generate high voltage? 2.draw electric lines between the plates of a parallel plate capacitor with 1(air) and 2(dielectric) as a medium? 3.near the surface of earth the field is about 100V/m. why do we then not ...
*Monday, June 10, 2013 at 10:46am*

**Physics (Tricky)**

If the length of a conductor is doubled, the resistance will be ___ the original resistance. A. less than - i think its A? B. equal to C. half D. twice A resistor most suited to dissipating high power levels would be: A. Thick film resistor - i think it's A? B. Wire wound ...
*Monday, June 10, 2013 at 10:34am*

**Physics**

If a car travels 60 mi. north for one-half hour, 100 mi. west for one hour, and 60 mi. south for 30 minutes, what is the total displacement of the car? PLEASE HELP ME!!!!
*Monday, June 10, 2013 at 10:31am*

**Physics**

Calculate the resistance of 80 metres of copper wire, with a c.s.a. of 0.5mm2, given its resistivity of 1.72 x 10^-6 ohms per metre, Note, the area of the wire must be expressed as a portion of its base unit of measurement, which is the square metre.
*Monday, June 10, 2013 at 10:27am*

**Physics**

Suppose that you are using a multimeter on the OHMS scale to test a capacitor and the meter reads zero. What condition of the capacitor does this indicate?
*Monday, June 10, 2013 at 10:22am*

**Physics**

What value of voltage will be reached across the plates of a capacitor, after two time constants, if the maximum value of voltage when fully charged, reaches 200 volts?
*Monday, June 10, 2013 at 10:20am*

**Physics**

Find the Time Constant for a 50 k resistor in a series with a 60 uF capacitor connected to a DC circuit. Also how long will it take for this capacitor to become charged?
*Monday, June 10, 2013 at 10:17am*

**physics**

how does the total energy stored in a capacitor change, when the medium of air is replaced by a medium of dielectric constaant K? Explain.
*Monday, June 10, 2013 at 3:29am*

**physics**

an electric motor represented by the 4 ohm resistor below accelerates a 20g car for 40 sec. it then collides with a perfectly inelastic collision with another car that has a mass of 10g and is traveling half the first car but in the opposite direction. what is the new velocity...
*Sunday, June 9, 2013 at 11:02pm*

**Physics**

A helicopter is flying in a straight line over a level field at a constant speed of 6.2 m/s and at a constant altitude of 11.3 m. A package is ejected horizontally from the helicopter with an initial velocity of 14.0 m/s relative to the helicopter, and in a direction opposite ...
*Sunday, June 9, 2013 at 7:06pm*

**Physics-Simple pendulum**

We're supposed to make a simple pendulum with a period of 24 seconds. So i attached a hardware bolt at the end of a string. The teacher is going the start the timer once we release the pendulum and wait until it returns to its maximum again. In our calculations we need to ...
*Sunday, June 9, 2013 at 6:08pm*

**physics**

draw the bimetallic
*Sunday, June 9, 2013 at 5:28pm*

**College Level Physics**

A horse pulls a cart with a force of 145 newtons at an angle of 30 degrees above the horizontal and moves along at a speed of 2.5 m/s. How much work to the nearest kJ does the force do in 6 minutes?
*Sunday, June 9, 2013 at 4:21pm*

**Physics**

An antelope moving with constant acceleration covers the distance between two points 75.0 m apart in 6.20 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? (b) What is the antelope’s acceleration?
*Sunday, June 9, 2013 at 2:24pm*

**Physics**

Two boys simultaneously aim their guns at a bird sitting on a tower. The first boy releases his shot with a speed of 100km/s at an angle of projection of 30. The second boy is ahead of the first boy by a distance of 50m and releases his shot with a speed of 80m/s. how must he ...
*Sunday, June 9, 2013 at 7:59am*

**physics**

The furthest distance from the Sun to Earth is df=1.521E8 The shortest distance from the Sun to Earth is ds=1.47E8 To simplify the problem, assume that the Earth's axis is always perpendicular to the plane of its trajectory around the Sun. The Sun always shines on half of ...
*Sunday, June 9, 2013 at 12:17am*

**physics**

Estimate the time difference between the longest amount of daylight in one day and the shortest amount of daylight on one day in seconds over the course of a year if you lived on the Earth's equator
*Sunday, June 9, 2013 at 12:12am*

**physics**

A charge of 21 nC is uniformly distributed along a straight rod of length 4.3 m that is bent into a circular arc with a radius of 1.7 m. What is the magnitude of the electric field at the center of curvature of the arc?
*Saturday, June 8, 2013 at 11:35pm*

**Physics**

A compact disc spins at 2.7 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 2.6 cm from the CD's center. (a) What is the coefficient of friction between the ant and the CD?
*Saturday, June 8, 2013 at 10:51pm*

**Physics**

What is the factor of safety of a steel hanger having an ultimate strength of 550.000MPa and supporting a load of 64000.000N. The steel hanger in question has a cross sectional area of 7.600cm^2. Answer = (Round to 3 decimal places)
*Saturday, June 8, 2013 at 4:05pm*

**physics**

A uniform sheet of surface current density Ks=Ky ay in z=0 plane. find the magnetic field strength H everywhere using ampere's law.
*Saturday, June 8, 2013 at 4:01pm*

**physics**

an electron with a speed of 5.00 x 10^8 cm/s enters an electric field of magnitude 1.00 x 10^3 N/C, traveling along field lines in the direction that retards its motion. a) How far will the electron travel in the field before stopping momentarily b) how much time will have ...
*Saturday, June 8, 2013 at 3:07pm*

**Physics**

What would happen when a dipole is placed in uniform electric field making an angle theta with the direction of electric field ?
*Saturday, June 8, 2013 at 6:29am*

**Physics**

What would happen when a dipole is placed in uniform electric field making an angle theta with the direction of electric field ?
*Saturday, June 8, 2013 at 1:44am*

**Physics**

1. A train traveling at a speed of 110km/h decelerates for 20 seconds. During that time it travels 450 meters. A) What is the acceleration? = m/s^2 B) What is its speed after deceleration? = km/h Initial velocity (u) = 110km/h Time (t) = 20s Distance = 450m Using this formula ...
*Friday, June 7, 2013 at 10:57pm*

**physics**

Two identical twins, Amy and Beatrice, are on top of two different slides, one on each slide. Both slides start 3 m above the ground and end 0.5 m above the ground. Amy's slide is a straight, 45 degree slide with height given by h=−x+3 (so it starts at x=0 with a ...
*Friday, June 7, 2013 at 10:32pm*

**physics**

Workers who wash windows or paint the outside of buildings use an interesting contraption known as a painter's lift. This consists of a harness that the worker wears suspended by a rope. The rope runs through a pulley mounted on the roof of the building and back down to ...
*Friday, June 7, 2013 at 10:25pm*

**physics**

We are doing the force table lab in class and now we are calculating the f equilibran and the equilibrant angle. I had no time graphing a solution and came up with the right answers by measuring, but we are also suppose to do it purely mathematically and I do not know how to. ...
*Friday, June 7, 2013 at 6:59pm*

**Physics**

A 0.5 kg mass is moving in a circle of radius 1.8 m on a flat frictionless table at the end of a string. The speed of the mass is 2.6 m/s. The string routes through a hole in the center of the table and is held by you underneath the table. A.) What is the angular momentum of ...
*Friday, June 7, 2013 at 3:46pm*

**physics **

A 0.5 kg mass is moving in a circle of radius 1.8 m on a flat frictionless table at the end of a string. The speed of the mass is 2.6 m/s. The string routes through a hole in the center of the table and is held by you underneath the table. What is the angular momentum of the ...
*Friday, June 7, 2013 at 3:43pm*

**physics numeral**

A person rows his boat in stream with a speed of 2.0 m/s.Water in the stream is flowing perpendicular to the direction of flow,find graphically his resultant velocity.
*Friday, June 7, 2013 at 10:43am*

**physics numeral**

An object of mass of 0.5 kg is whirled at the end of a string 0.8 m long.If the string makes three revolutions in 1.2 s,find the tension in the string.
*Friday, June 7, 2013 at 10:32am*

**physics**

a large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. if the time of the collision is 1 sec then, a) which vehicle experiences smaller force of impact? b) which vehicle experiences the ...
*Friday, June 7, 2013 at 8:53am*

**physics**

Workers who wash windows or paint the outside of buildings use an interesting contraption known as a painter's lift. This consists of a harness that the worker wears suspended by a rope. The rope runs through a pulley mounted on the roof of the building and back down to ...
*Friday, June 7, 2013 at 7:56am*

**physics**

two cars weighing 1500 kg are made to collide with a wall.the initial and final velocities are 15 m/s and 2.6 m/s.if the collision last for 0.15 seconds,then find impulsive force exerted on the car
*Friday, June 7, 2013 at 6:11am*

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