Thursday

October 2, 2014

October 2, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A flat circular plate of copper has a radius of 0.278 m and a mass of 42.6 kg. What is the thickness of the plate? answer in units of m
*Saturday, September 6, 2014 at 12:31pm*

**physics**

Two objects with masses 2.0 and 3.0 kg move toward each other, both with speeds V0 = 5.0 m/s. They collide head on and stick together. (a) Calculate their final velocity. (b) Calculate the amount of kinetic energy lost during the process. (c) Suppose the two masses approach ...
*Saturday, September 6, 2014 at 12:29pm*

**Physics Help!!!!**

Describe what it means (describe the motion) if the acceleration vector has the same direction as the velocity vectors, and what it means if the acceleration vector has the opposite direction as the velocity vectors. Consider all four possibilities and explain what would ...
*Saturday, September 6, 2014 at 11:20am*

**physics**

A bus accelerates at 1.4 m/s2 from rest for 14 s. It then travels at constant speed for 23 s, after which it slows to a stop with an acceleration of magnitude 1.3 m/s2.
*Saturday, September 6, 2014 at 11:19am*

**Physics**

1.A bus travels 400 m between two stops. It starts from rest and accelerates at 1.50 m/s^2 until it reaches a velocity of 9.00 m/s. The bus continues at this velocity and then decelerates at 2 m/s^2 until it comes to a halt. Find the total time required for the journey. 2.A 28...
*Saturday, September 6, 2014 at 3:11am*

**Physics**

A ball is thrown vertically upward from the ground with a speed of 36.0 m/s.Suppose the acceleration of gravity were only 2.00 m/s^2 instead of 9.80 m/s^2 a)At what time does it have a velocity of 12.0 m/s upward? b)At what time does it have a velocity of 12.0 m/s downward? c)...
*Saturday, September 6, 2014 at 3:00am*

**Physics**

What is the connection between Weber’s Law, Fechner’s Law, and Steven’s Power Law
*Saturday, September 6, 2014 at 2:00am*

**physics**

a fire hose hold near the ground shoots water at speed of 6.8 m/s at what angle(s) should the nozzle point in order that the water land 2 dm away why are there two diffent angles?
*Saturday, September 6, 2014 at 1:39am*

**Physics Help!!!!**

Describe what it means (describe the motion) if the acceleration vector has the same direction as the velocity vectors, and what it means if the acceleration vector has the opposite direction as the velocity vectors. Consider all four possibilities and explain what would ...
*Friday, September 5, 2014 at 11:54pm*

**Physics**

Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on the two balls are equal, what is the ...
*Friday, September 5, 2014 at 11:22pm*

**Physics**

Instructions for finding a buried treasure include the following: Go 745.6 paces at 298◦, turn to 204◦ and walk 178 paces, then travel 490 paces at 55◦ Find the magnitude of the resultant displacement from the starting point. Answer in Units of paces. (Part ...
*Friday, September 5, 2014 at 11:20pm*

**physics**

On a safari, a team of naturalists sets out toward a research station located 5.54 km away in a direction 47.9 ° north of east. After traveling in a straight line for 1.29 km, they stop and discover that they have been traveling 24.6 ° north of east, because their ...
*Friday, September 5, 2014 at 10:53pm*

**AP Physics **

A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.90 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s. Answer ...
*Friday, September 5, 2014 at 10:44pm*

**AP Physics **

Two locomotives approach each other on parallel tracks. Each has a speed of v = 85 km/h with respect to the ground. If they are initially d = 7.0 km apart, how long will it be before they reach each other?
*Friday, September 5, 2014 at 10:44pm*

**AP Physics **

A car traveling 92 km/h is 130 m behind a truck traveling 75 km/h. How long will it take the car to reach the truck?
*Friday, September 5, 2014 at 10:43pm*

**Physics**

A cannon fires a shell straight upward; 2.1 s after it is launched, the shell is moving upward with a speed of 20 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch and 4.7 s after the launch.
*Friday, September 5, 2014 at 7:18pm*

**physics**

Two forces are applied to a tree stump to pull it out of the ground. Force A has a magnitude of 2880 newtons (N) and points 42.0 ° south of east, while force B has a magnitude of 4360 N and points due south. Using the component method, find the (a) magnitude and (b) ...
*Friday, September 5, 2014 at 7:17pm*

**Physics, Electricity and Magnetism, Sciences**

Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on the two balls are equal, what is the ...
*Friday, September 5, 2014 at 7:15pm*

**Physics **

Two bicyclists, starting at the same place, are riding toward the same campground by different routes. One cyclist rides 1030 m due east and then turns due north and travels another 1480 m before reaching the campground. The second cyclist starts out by heading due north for ...
*Friday, September 5, 2014 at 7:12pm*

**Physics**

A ball is thrown from the ground. Its velocity after 4 ^ ^ seconds is (15x -3y ) m/s. the range of the ball is 205 m. 189 m. 111 m. 98 m.
*Friday, September 5, 2014 at 6:54pm*

**Physics**

A flight traffic controller is watching two planes. One is 20.0 km away in a direction 35.0º west of north at an altitude of 1650 m. The other is 18.0 km away in a direction 75.0º north of east at an altitude of 1420 m. How far apart are the two planes? Ax = 20.0km*...
*Friday, September 5, 2014 at 6:27pm*

**Physics**

Should a veterinarian be skeptical if someone said that her adult collie weighed 40.0N ? Should a nurse question a medical chart which showed that an average-looking patient had a mass of 200kg ?
*Friday, September 5, 2014 at 5:54pm*

**Physics**

X=1/2at^2 Solve for a Solve for t Can you please show me how to do this Thank u
*Friday, September 5, 2014 at 4:45pm*

**Physics**

A speeding motorcyclist is traveling at a constant speed of 31.1 m/s when he passes a police car parked on the side of the road. The radar, positioned in the police car's rear window, measures the speed of the motorcycle. At the instant the motorcycle passes the police car...
*Friday, September 5, 2014 at 2:27pm*

**Physics**

A rock is dropped into a deep hole and 2.2 s later the sound of striking the bottom is heard. If the speed of sound is 340 m/s, what is the depth of the hole?
*Friday, September 5, 2014 at 1:30pm*

**Physics(Need Help please)**

Four equal charged +Q are placed at the corners of a square of side a. Find the electric field strength at the midpoint of one side. Express your answer in terms of Q, a, and the constant k
*Friday, September 5, 2014 at 12:44pm*

**Physics**

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the electron's ...
*Friday, September 5, 2014 at 9:00am*

**AP Physics**

A jogger runs in a straight line with an average velocity of 7.7 m/s for 4.5 minutes, and then with an average velocity of 2.8 m/s for 2.8 minutes. What is her total displacement? Answer in units of m.
*Thursday, September 4, 2014 at 9:49pm*

**physics**

a pitched ball is hit by a batter at a 45 degree angle and it just clears the outfield fence, 110m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat. Ignore air resistance.
*Thursday, September 4, 2014 at 8:26pm*

**Physics**

A sailboat travels 45km eastward at a speed of 20km/hr. The wind then drops, and the boat continues due east with a speed of 15km/hr for 25km. a.How long did it take the boat to travel 55km? b. What was the average velocity for the trip?
*Thursday, September 4, 2014 at 8:17pm*

**Physics**

A sailboat travels 45km eastward at a speed of 20km/hr. The wind then drops, and the boat continues due east with a speed of 15km/hr for 25km.
*Thursday, September 4, 2014 at 8:15pm*

**Physics**

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the electron's ...
*Thursday, September 4, 2014 at 7:37pm*

**Physics**

For any given quadrupole, let the charges be +q, −q, +q, and −q at the corners of the square, and l be the side of the square. Calculate approximately the electric potential and the electric field far away from the quadrupole, IN THE THREE-DIMENSIONAL SPACE. You ...
*Thursday, September 4, 2014 at 3:48pm*

**Physics**

A sphere of radius R has inhomogeneous charge distribution on its surface. Its surface charge density is σ = σ0 cos θ, where σ0 is a positive constant, and θ is the angle from the “north pole” to the point of interest and satisfies 0 ≤...
*Thursday, September 4, 2014 at 3:47pm*

**physics**

A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. How long was the ball in the air? Round the answer to the nearest tenth of a second.
*Thursday, September 4, 2014 at 3:18pm*

**physics**

A stone is launched straight up by a slingshot. Its initial speed is 20.6 m/s and the stone is 1.59 m above the ground when launched. How high above the ground does the stone rise? How much time elapses before the stone hits the ground?
*Thursday, September 4, 2014 at 1:15pm*

**Physics**

The brightness of a light source at a distance of 100m from the source is 40 units. What would be the brightness if the distance is reduced to 50m?
*Thursday, September 4, 2014 at 1:04pm*

**physics**

Two identical small spherical conductors (point charges), separated by 0.6 m, carry a total charge of 200 mu or micro CC. They repel one another with a force of 120 N. (For the universal constant k use the value 8.99 times 109 N m2/C2.) so I used q1 + q2= 200e-6C and q1*q2= Fr...
*Thursday, September 4, 2014 at 11:42am*

**Physics**

An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...
*Thursday, September 4, 2014 at 11:39am*

**Physics**

'An air rifle pellet of mass 2g is fired into a block of plasticine mounted on a model railway truck. the truck and plasticine have a mass of .1kg. The truck moves off after the pellet hits the plasticine with an initial velocity of .8m/s. calculate the momentum of the ...
*Thursday, September 4, 2014 at 8:44am*

**physics**

A car is moving at 90 km/h when the driver notices an animal that is about to cross the road 100 m away and he decides to apply the brakes. The reaction time of the driver is 0.3 s. Calculate the acceleration of the car when it stopped and the time taken from the time the ...
*Thursday, September 4, 2014 at 7:01am*

**Physics**

Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 36.3 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun...
*Thursday, September 4, 2014 at 4:12am*

**physics**

if |vector a+ vector b| = |vector a- vector b|find the angle between a and b
*Thursday, September 4, 2014 at 1:09am*

**Physics**

What is the application of simple harmonic motion to our daily lives?
*Wednesday, September 3, 2014 at 11:32pm*

**Physics**

Find the average velocity (in m/s) of an object that starts 200 meters north of town and is 1200 meters north of town after 200 seconds.
*Wednesday, September 3, 2014 at 11:22pm*

**Physics**

-Use upward as positive and 10.0 m/s2 for the magnitude of g. -Let us say that you toss an object upwards at 5.0 from a height of 17.0 m. 1.)What is in m/s2 the acceleration of the object the moment it reaches the highest position? 2.)What is in m/s2 the acceleration of the ...
*Wednesday, September 3, 2014 at 11:08pm*

**physics**

A child, who is 45 m from the bank of a river is being carried downstream by the river's swift current of 1.0 m/s. As the child passes a lifeguard on the river's bank, the lifeguard starts swimming in a straight line until she reaches the child at a point downstream. ...
*Wednesday, September 3, 2014 at 10:49pm*

**physics**

The edges of a shoebox are measured to be 11.9 cm, 17.3 cm, and 29 cm. Determine the volume of the box retaining the proper number of significant figures in your answer.
*Wednesday, September 3, 2014 at 10:41pm*

**physics**

An automobile starts from rest and accelerates to a final velocity in two stages along a straight road. Each stage occupies the same amount of time. In stage 1, the magnitude of the car's acceleration is 3.12 m/s2. The magnitude of the car's velocity at the end of ...
*Wednesday, September 3, 2014 at 10:37pm*

**Physics**

A 49-N force is applied perpendicular to the portion BC of the bent bar. Determine the moment of P about point B and about point A. The image shows a bar that is straight from point A to B but then bends at a 42 degree angle to the left from point B to point C. The distance ...
*Wednesday, September 3, 2014 at 8:44pm*

**AP Physics **

A horse canters away from its trainer in a straight line, moving 100 m away in 19.0 s. It then turns abruptly and gallops halfway back in 5.4 s. (a) Calculate its average speed. b) Calculate its average velocity for the entire trip, using "away from the trainer" as ...
*Wednesday, September 3, 2014 at 8:13pm*

**Physics**

An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.75m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, AT, is 11.5 times the cross-...
*Wednesday, September 3, 2014 at 8:01pm*

**AP Physics **

A particle at t1 = -1.4 s is at x1 = 3.6 cm and at t2 = 4.5 s is at x2 = 8.5 cm. What is its average velocity?
*Wednesday, September 3, 2014 at 7:59pm*

**Physics**

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.70s later. What was the rocket's acceleration? Express your answer with the appropriate units.
*Wednesday, September 3, 2014 at 7:43pm*

**Physics**

What is the average velocity of the cart when moving from position x = 0.10 m to position x = 1.10 m? For X=0.10m on the time it took the cart to reach that position it is 0.34s The velocity of the cart at 0.10m is 0.87 For x=1.10m on the time it took the cart to reach that ...
*Wednesday, September 3, 2014 at 7:39pm*

**Physics**

A ball is thrown upwards, from a building. It's height(h), in meters above the ground seconds(t) after being thrown is given by h(t)=-5t^2+15t+50 a) How tall is the building? (explain your answer) b) How long does it take the ball to reach the ground? c) For how long is ...
*Wednesday, September 3, 2014 at 7:23pm*

**AP Physics **

If you are driving 116 km/h along a straight road and you look to the side for 1.0 s, how far do you travel during this inattentive period?
*Wednesday, September 3, 2014 at 7:10pm*

**Physics**

An airplane has an airspeed of 770 kilometers per hour at a bearing of N 48 degrees E. If the wind velocity is 28 kilometers per hour from the west, find the angle representing the bearing for the ground speed? I found Rx and Ry which are 543.23 and 572.22 respectively. To ...
*Wednesday, September 3, 2014 at 6:35pm*

**11 Physics**

my teacher gave me this question for review and i don't know how to do it!! HELP!!! A ball is thrown upwards, from a building. It's height(h), in meters above the ground seconds(t) after being thrown is given by h(t)=-5t^2+15t+50 a) How tall is the building? (explain ...
*Wednesday, September 3, 2014 at 6:23pm*

**Physics**

An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...
*Wednesday, September 3, 2014 at 3:52pm*

**Physics**

An object starts from rest an undergoes a constant acceleration in the positive x direction. After some time it covers a displacement of 37 meters in the positive x direction achieving some final velocity. If the object started from rest with double the original acceleration (...
*Wednesday, September 3, 2014 at 12:00pm*

**physics**

A car drives 55 km east in a time of 1.6 hours and then drives west some distance. However, the total distance traveled for the entire trip is 338 km and the total time taken for the entire trip is 2.6 hours. What is the average speed of the second part of the trip (when ...
*Wednesday, September 3, 2014 at 11:53am*

**physics **

sledge of mass 80 kg moves over the frozen surface of a lake with a velocity of 30m/s and comes to rest in 5s. find frictional force between the lake and sledge
*Wednesday, September 3, 2014 at 8:17am*

**Physics**

1.A brass wire 80 cm long and 0.3 cm in diameter is used to hang an object weighing 6.5 x 10 ^5 dynes. Find stress, strain and young's modules. 2. To one end of a wire 1.2 m long and 0.4 cm in diameter is hung on object with a mass of 10 kg. The wire is found to be ...
*Wednesday, September 3, 2014 at 7:18am*

**Physics**

1. You are tasked to design a car park on the top floor of a condominium that can accommodate 10 cars, each car has a maximum mass of 2000 kg. The material you are using can withstand a pressure of 500 N/m^2. Calculate how large your park must be? 2. Cheryl filled a measuring ...
*Wednesday, September 3, 2014 at 7:13am*

**Physics**

1. The total length of a spring is 0.25 m. What it is unstretched and 0.30 m when a force of 17.82 N is applied to it. What will be the length when 26.72 N is applied to it? 2. A piller with a cross sectional area of 1.5 m^2 supports a portion of a building with a mass of 1.5 ...
*Wednesday, September 3, 2014 at 7:02am*

**Physics**

1. The water pressure in a kitchen faucet is 3.43 x 10^5 N/m^2. How high above the faucet is the surface of the water in the storage tank? 2. A swimming pool 8.0 m x 15.0 m has a uniform depth of 2.0 m. Determine the total force and the absolute pressure on the bottom of the ...
*Wednesday, September 3, 2014 at 6:52am*

**Physics**

1. What is the pressure on the bottom of an aquarium 0.30 m deep filled with water? 2. The plug in a bathtub is 10 cm^3in area and is 0.8 m below the surface of the water. What is the force of the water on the plug? 3. If a column of oil 0.89 m high in balanced by a column of ...
*Wednesday, September 3, 2014 at 6:44am*

**physics**

Q. 2. A force of 100N acts on a mass of 25 kg for 5 s .What velocity does it generate?
*Wednesday, September 3, 2014 at 3:29am*

**physics**

Student throws a baseball at a large gong 79 miles away and hears the sound of gong 2.63333 seconds later. The speed of sound in air is 330 miles per second. What was the average speed of baseball on its way to gong ?
*Wednesday, September 3, 2014 at 12:35am*

**Physics**

How much heat must be removed from a 240 g block of copper to lower its temperature from 150°C to 18°C? The specific heat capacity of copper is 0.093 cal/g·C°.
*Tuesday, September 2, 2014 at 11:26pm*

**Physics**

A car accelerates from rest at 2.3m/s^2 for 18 seconds, then decelerates to 15 m/s over 301 meters. A) How fast is the car moving at 18seconds? (Is it 2.3 m/s^2) B) How far does the car travel over the entire trip? (The m/s and m/s^2 is tripping me up) C) How long does it ...
*Tuesday, September 2, 2014 at 11:15pm*

**physics**

A spherical shell is formed by taking a solid sphere of radius 20.0 cm and hollowing out a spherical section from the shell's interior. Assume the hollow section and the sphere itself have the same center location. a) If the hollow section takes up 90% of the total volume...
*Tuesday, September 2, 2014 at 11:14pm*

**Physics**

A sailboat runs before the wind with a constant speed of 4.0m/s in a direction 34∘ north of west. how far west has the sail boat traveled in 29 minutes
*Tuesday, September 2, 2014 at 9:59pm*

**Physics**

How do I solve this? Traveling at 60. mi/hr you see a dog in the road. Your reaction time to hit the brakes is 0.75 seconds and you can decelerate at 7.9 m/s^2. (1 mile = 1609 meters) A) How far do you travel from the moment you see the dog until the moment you hit the brakes...
*Tuesday, September 2, 2014 at 9:18pm*

**Physics**

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting for at least 1 ms ...
*Tuesday, September 2, 2014 at 8:28pm*

**Grade 11 Physics**

Average speed: Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometres away. It takes Amy 40 mins to arrive at school. Bill arrives 20 mins after Amy. How much faster(in meters/second) is Amy's average speed for the entire trip?
*Tuesday, September 2, 2014 at 7:09pm*

**gr 11 physics**

Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 km away. It takes Amy 40 mins to arrive at school. Bill arrives 20 mins after Amy. How much faster(in meters/second) is Amy's average speed for the entire trip?
*Tuesday, September 2, 2014 at 6:17pm*

**gr 11 physics**

Steve traveled the first 2 hours of his journey at 40km/h and the last 3 hours of his journey at 80km/h. What is his average speed of travel for the entire journey?
*Tuesday, September 2, 2014 at 6:14pm*

**Physics**

A 54.0-g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 18.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval in ...
*Tuesday, September 2, 2014 at 6:12pm*

**calculus/physics**

A trough is 2 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x10 from x=−1 to x=1. The trough is full of water. Find the amount of work required to empty the trough by pumping the water over the top. ...
*Tuesday, September 2, 2014 at 4:42pm*

**physics**

a labourer lifts 100 stone to a height of 6m in two minute.if mass of each stone be one kilogram, calculate the average power
*Tuesday, September 2, 2014 at 3:45pm*

**physics engg.**

A deutron is moving with a speed of 2*10^8m/s. Find the wavelength of the matter wave associated with it?
*Tuesday, September 2, 2014 at 2:25pm*

**physics**

What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r = 0.84 ± 0.04m ?
*Tuesday, September 2, 2014 at 1:32pm*

**Maths,Physics,life science,geography,**

An airplane lands with a velocity of 100 m.s. The maximum rate at which it can slow down is 5,0 m.s 1. What is the minimum time needed to come to rest, starting from when it first touches the ground? 2. Can this plane safely land at a small airport where the landing strip is 0...
*Tuesday, September 2, 2014 at 1:01pm*

**Physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both reach the edge of a 7.8 m waterfall. If the spy's speed is 11 m/s and the officials' speed is 22 m/s...
*Tuesday, September 2, 2014 at 11:13am*

**physics**

A man in a boat moving at constant speed of 60km/h relative to the shore throws an object in the forward direction with a speed of 30km/h. What is the speed of the object as measured by an observer at rest at the shore?
*Tuesday, September 2, 2014 at 10:48am*

**physics**

If the mass of 35 feet of paper is 280gram,how many feet will weight 7.2 kg.
*Tuesday, September 2, 2014 at 10:34am*

**physics**

if the resultant of 2 equal force inclint to each other at 60° is 8root3N. Find the component forces?
*Tuesday, September 2, 2014 at 8:57am*

**physics**

a hemisphere container is made with the following dimensions. the external diameter of the container is 12 cm. the internal diameter of the container is 6 cm. it is filled with water to the brim. what is the density of the empty container if the total mass of the container ...
*Tuesday, September 2, 2014 at 6:39am*

**Physics, Math**

A typical volume of a modern hot air balloon is 2500 cubic metres, and a typical maximum temperature of the hot air is 120 degrees Celsius. Given these figures, and an outside air temperature and density of 15 ∘C and 1.225 kg/m3 respectively, compute the maximum mass (in...
*Tuesday, September 2, 2014 at 12:41am*

**Physics**

Two 10-cm-diameter charged rings face each other, 20cm apart. The left ring is charged to -22nC and the right ring is charged to +22nC . What is the magnitude of the electric field E⃗ at the midpoint between the two rings?
*Monday, September 1, 2014 at 9:54pm*

**Physics B**

A car, moving along a straight stretch of highway, begins to accelerate at 0.0261 m/s2. It takes the car 48.6 s to cover 1 km. How fast was the car going when it first began to accelerate? Answer in units of m/s Couldn't find a formula for this :(
*Monday, September 1, 2014 at 8:57pm*

**Physics - General Physics**

Violet light and red light travel through air and strike a block of plastic at the same angle of incidence. The angle of refraction is 30.700° for the violet light and 31.380° for the red light. The index of refraction for violet light in plastic is greater than that ...
*Monday, September 1, 2014 at 8:18pm*

**Physics**

A vertical container with base area of length L and width W is being filled with identical pieces of candy, each with a volume of v and a mass m. Assume that the volume of the empty spaces between the candies is negligible. If the height of the candies in the container ...
*Monday, September 1, 2014 at 7:52pm*

**physics**

To estimate how high the cliff is you throw a rock off the edge and 7.8 s later you hear the rock hit the ground. The speed of sound is 330 m/s. Ignoring air resistance how high is the cliff?
*Monday, September 1, 2014 at 7:15pm*

**Physics**

As two trains move along a track, their conductors suddenly notice that they are headed toward each other. The figure below gives their velocities v as functions of time t as the conductors slow the trains. The slowing processes begin when the trains are 265 m apart. What is ...
*Monday, September 1, 2014 at 4:28pm*

**physics**

The brakes on your automobile are capable of creating acceleration of 14 ft/s2. If you are going 66 mi/hr and suddenly see a state trooper, what is the minimum time required to get your car to 55 mi/hr?
*Monday, September 1, 2014 at 4:06pm*

**physics**

Two identical small spherical conductors (point charges), separated by 0.6 m, carry a total charge of 200 mu or micro CC. They repel one another with a force of 120 N. (For the universal constant k use the value 8.99 times 109 N m2/C2.) I think i am suppose to use E=kQ/r^2 . ...
*Monday, September 1, 2014 at 3:40pm*

**physics**

Three point charges are fixed in place in a right triangle. What is the electric force on the q = -0.7 µC charge due to the other two charges? (Let Q1 = +0.79 µC and Q2 = +1.5 µC.)
*Monday, September 1, 2014 at 3:06pm*

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