Sunday

July 5, 2015

July 5, 2015

**Physics. URGENT Help Please**

What is the separation of colors in a rainbow produced by? (Points : 1) different diffraction for different wavelengths different interference for different wavelengths <--- different refraction for different wavelengths difference in total internal reflection for ...
*Thursday, April 2, 2015 by Taylor*

**physics**

60 cubic feet of air at 30 PSIG and 50 degrees F is compressed to 80 PSIG and 110 degrees F. What is the final volume?
*Thursday, April 2, 2015 by emma*

**physics**

Boxes are moved on a conveyor belt from where they are filled to the packing station 12.0 m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accelerates for half the distance, then decelerates for the ...
*Thursday, April 2, 2015 by shannon*

**physics**

A 2kg block situated on a rough incline is connected to a spring of negligible mass having a spring costant of 100N/m.the pulley is frictionless.the block is released from rest when the spring is unstretched.the block moves 20 cm down the incline before coming to rest. a.find ...
*Thursday, April 2, 2015 by virginia*

**Physics**

In a straight line motion the distance travelled is proportional to the square root of Time taken. The acceleration of a particle is proportional to:-(i)√v(ii) v^2(iii)velocity (iv)v^3.Why?
*Thursday, April 2, 2015 by Diksha*

**Physics**

The position of a body moving along x-axis at Time t is given by x=(t^2-4t+6)m. The distance travelled by body in time interval t=0 to t=3s.
*Thursday, April 2, 2015 by Diksha*

**Physics**

determine the mass of ice that will be melting when 1.3g of steam at 102 ° C is passed into a calorimeter containing 80g of ice at 0 ° C
*Thursday, April 2, 2015 by Ansari Ahmed*

**physics**

Calculate the coefficient of kinetic friction for tyre rubber on the road surface.
*Thursday, April 2, 2015 by patrick*

**physics**

(b) A boy wishes to walk on ice block at a constant speed. The coefficient of sliding friction for steel on ice is 0.05 and the boy weighs 150 N. Find the force required to keep the boy moving at a constant speed along the ice.
*Thursday, April 2, 2015 by tiisla*

**Physics **

How are lights in schools usually wired... Series or parallel circuits?
*Thursday, April 2, 2015 by Anonymous*

**Physics 101**

A 25 kg box rests on an inclined plane which is 30o to the horizontal. The coefficient of sliding friction between the box and the plane is 0.30. Determine the acceleration of the box down the plane. (9.8 m/s2)
*Thursday, April 2, 2015 by Roman*

**Physics**

A hockey player is initially moving at 5.00m s to the east. Her mass is 50.0 kg. She intercepts and catches on her stick a puck initially moving at 35.0m s at an angle of 30 degrees (Fig. 6.40). Assume that the puck’s mass is 0.50 kg and the two form a single object for a...
*Wednesday, April 1, 2015 by Dave*

**physics**

(a) Find the electric potential difference V B − V A due to a point charge q 1 = −2.65 nC that is 0.250 m from location A and 0.410 m from location B. V (b) A charge q 2 moving from B to A gains in kinetic energy. What is the sign of this charge? positive negative
*Wednesday, April 1, 2015 by mathew*

**physics**

Two charges q 1 = −3.20 nC and q2 = +8.96 nC are at a distance of 1.94 µm from each other. q 1 is fixed at its location while q 2 is released from rest. (a) What is the kinetic energy of the charge q 2 when it is 0.340 µm from q 1? J (b) The charge q 2 has a ...
*Wednesday, April 1, 2015 by mathew*

**physics**

A student measures the index of refraction of a gooey, transparent liquid to be 1.41. How fast does light travel in this liquid?
*Wednesday, April 1, 2015 by jordyn*

**Physics**

A Van de Graaff generator is a device for generating a large electric potential by building up charge on a hollow metal sphere. A typical classroom-demonstration model has a diameter of 30 cm. How much charge is needed on the sphere for its potential to be 530,000 V?
*Wednesday, April 1, 2015 by MMM*

**physics**

A hydraulic cylinder has to overcome a force of 12,600 pounds on the extend stroke and 9,375 pounds on the return stroke. The maximum system pressure available is 2200 PSIG. What is the smallest diameter cylinder required to overcome the load and what is the maximum diameter ...
*Wednesday, April 1, 2015 by emma*

**Physics- Solenoid Questions**

1) A technician has been given wire that can safely carry 5 A. She has been instructed to construct a solenoid that will have a magnetic field of 0.06 T at its center. After completing some tests of the wire, the technician finds that the tightest safe winding possible with ...
*Wednesday, April 1, 2015 by Meli*

**physics**

A 2inch diameter pipe has been chosen to pass 65 GPM. Can this diameter be used for the suction line? If not , what line diameter should be specified?
*Wednesday, April 1, 2015 by emma*

**physics**

. An open tank holding 400 cubic foot of air at atmospheric pressure at 70 degrees F and heated to 160 degree F. What is the volume of air that escapes from the tank?
*Wednesday, April 1, 2015 by emma*

**Physics Help Please**

A solenoid 20 cm long is constructed from 500 loops of wire and carries a current of 5 A as seen the diagram below. A tiny hole is drilled through the diameter of the solenoid in such a way that the current through the solenoid is not disrupted. If an electron flies through ...
*Wednesday, April 1, 2015 by help please!*

**physics**

A rod with a length L = 0.385 m and a nonuniform linear mass density rests along the y axis with one end at the origin. If the linear mass density of the rod is given by λ = (5.00 ✕ 10−2 kg/m) + (1.50 ✕ 10−2 kg/m2)y then a) what is the total mass...
*Wednesday, April 1, 2015 by Pissed off at this question rn*

**physics**

(b) A boy wishes to walk on ice block at a constant speed. The coefficient of sliding friction for steel on ice is 0.05 and the boy weighs 150 N. Find the force required to keep the boy moving at a constant speed along the ice.
*Wednesday, April 1, 2015 by tiisla*

**Physics**

If you take a pendulum clock from Paris to Cayenne, French Guiana, it loses 2.5 min each day. If the period of a pendulum of given length is proportional to 1/sqrt(g), and if g = 980.9 cm/s^2 in Paris, what is g in Cayenne? ...Um...I'm not entirely sure where to start. Do ...
*Wednesday, April 1, 2015 by Nora*

**Chemistry physics**

3.25x10-3 kg of gold is deposited onto the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through this cell in amperes? Assume that the gold ions carry one elementary unit of charge
*Tuesday, March 31, 2015 by Bill*

**Physics**

If 3.25x10-3 kg of gold is deposited onto the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through this cell in amperes? Assume that the gold ions carry one elementary unit of charge
*Tuesday, March 31, 2015 by Bill*

**physics**

A 2inch diameter pipe has been chosen to pass 65 GPM. Can this diameter be used for the suction line? If not , what line diameter should be specified?
*Tuesday, March 31, 2015 by sam*

**physics**

. An open tank holding 400 cubic foot of air at atmospheric pressure at 70 degrees F and heated to 160 degree F. What is the volume of air that escapes from the tank?
*Tuesday, March 31, 2015 by sam*

**physics**

A 25HP electric motor turning a 1800 RPM will produce how many foot pounds of torque?
*Tuesday, March 31, 2015 by sam*

**Physics**

A 0.20kg ball on a string is whirled on a vertical circle at a constant speed.When the ball is at 3 o'clock position, the string tension is 20N.Find the tensions in the string when the ball is at 12 o'clock and 6 o'clock positions
*Tuesday, March 31, 2015 by Refiloe*

**physics**

A man of mass 90kg carries a block of mass 20kg up a vertical ladder at length 5m. What work has the woman done. (take g 10m /s)
*Tuesday, March 31, 2015 by omodele queen *

**Physics**

A uniform cylindrical spool of mass M and radius R unwinds an essentially massless rope under the weight of a mass m. If R = 12 cm, M = 400 gm and m = 50 gm, find the speed of m after it has descended 50 cm starting from rest. Solve the problem twice: once using Newton's ...
*Tuesday, March 31, 2015 by Nora*

**Physics**

Which best explains why openness is important to the progress of science?
*Tuesday, March 31, 2015 by JaQua*

**Physics**

A costant force F iss applied to a crate of mass 25kg to move it upwards along a frictionless inclined plane, when it reaches point A, its speed is 12m.s and 10,8 m,s when it reaches point B which is 3,5m futher up the incline. 5,1 give a reason why the normal force does no ...
*Tuesday, March 31, 2015 by Allen C*

**Physics**

A costant force F is aplied to a crate of mass 25kg to move it upward along a frictionless inclined plane.when it reaches point A,its speed is 12 m.s-1 and 10,8 m,s-1 when it reaches point B which is 3.5m futher up the incline
*Tuesday, March 31, 2015 by Hlengiwe*

**Physics**

At an intersection a car of mass 900kg traveling east collides with a pick up truck of mass 1800kg that is traveling North. Two vehicles stick together as a result of the collision, and after collision, the wreckage is sliding at 16m/sec in the direction 24 degrees East of ...
*Tuesday, March 31, 2015 by anne*

**physics**

A copper atom has 29 electrons revolving around the nucleus. A copper ball has 4x10^23 atoms. What fraction of the electrons be removed to give the ball a charge of +9.6uC?
*Tuesday, March 31, 2015 by David *

**Physics**

The force acts on a 1.7kg object whose initial speed is 0.44m/s and initial position is x = 0.27. Find the speed of the object when it is a the location x = 0.99m?
*Tuesday, March 31, 2015 by Anonymous*

**physics**

At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?
*Tuesday, March 31, 2015 by Jaimi*

**Physics **

Determine the amount of energy required to raise the temperature of 250 grams of steel from a temperature of 15 oC to a temperature of 40 oC . The specific heat of steel is 0.11 cal/gram oC.
*Monday, March 30, 2015 by Melissa *

**physics**

In 1993, Cuban athlete Javier Sotomayor set the world record for the high jump. the gravitational potential energy associated with Sotomayor's jump was 1970 J. Sotomayor's mass was 82.0 kg. How high did Sotomayor Jump?
*Monday, March 30, 2015 by Helena*

**physics**

a window air conditioner is estimated to have a cost of operation of $50 per 30 days. this is based on the assumption that the air conditioner will run half of the time and that electricity costs $.090 per kWh. determine how much current the air conditioner will take from a ...
*Monday, March 30, 2015 by allan*

**Physics**

A charged capacitor, C = 40 micro F, is connected to a resistor, 120 ohms. How much time will elapse until the voltage falls to 25% of its original (max) value? im not even sure what equation to use for this, so if someone could help me to figure that out it wou ld be greatly ...
*Monday, March 30, 2015 by Amber*

**physics**

A 0.205 kg bird flying along at 7.8 m/s sees a 0.029 kg insect heading straight toward it with a speed of 15 m/s (as measured by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch. What is the bird's speed immediately after ...
*Monday, March 30, 2015 by Kristin*

**physics **

A freshman smart alek lips off onces too often! The assistant principle loses her cool and grabs the 38.0kg punk by the hair- swinging him in a vertical circle of radius 1.20m! if the freshman is moving at 6.30m/s at the bottom of the swing, calculate: A) the tensions in the ...
*Monday, March 30, 2015 by greoge*

**physics**

The principle of conservation of heat energy states that
*Monday, March 30, 2015 by temmyth*

**PHYSICS NEED HELP ASAP**

A freshman smart alek lips off onces too often! The assistant principle loses her cool and grabs the 38.0kg punk by the hair- swinging him in a vertical circle of radius 1.20m! if the freshman is moving at 6.30m/s at the bottom of the swing, calculate: A) the tensions in the ...
*Monday, March 30, 2015 by greoge*

**physics**

a 60-kilogram astronaut floating in space outside the capsule throws his 0.50-kilogram hammer such that it moves with a speed of 10 m/s relative to the capsule. what happens to the astronaut?
*Monday, March 30, 2015 by Ted*

**physics**

a 50g slug is shot from a rifle at 900m/s a) what is the KE of the slug? b) how much work is done on the slug if it starts from rest?
*Monday, March 30, 2015 by joe*

**Physics**

So, "a uniform steel rod of length 1.20 meters and mass 6.40 kg has attached to each end a small ball of mass 1.06 kg. The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint." There's more to the question, but the only ...
*Monday, March 30, 2015 by Nora*

**physics**

A merry-go-round rotates at the rate of 0.16 rad/s with a(n) 43.0 kg man standing at a point 2.4 m from the axis of rotation. What is the new angular speed when the man walks to a point 0.64 m from the center? Assume that the merry-go-round is a solid 5.99 ×102 kg ...
*Monday, March 30, 2015 by Jalen*

**physics**

Part 2: Complete the following math problems by using the Law of Momentum Conservation. Formulas: i. Momentum = (mass) * (velocity) ii. Impulse = (Applied force) * (time) and Impulse = Change in Momentum iii. Applied Force = (Change in Momentum) / (time) iv. For multiple ...
*Sunday, March 29, 2015 by Sarah*

**physics**

A 8.0 kg shell leaves a 2.0 x 103 kg cannon, at a speed of 4.0 x 102 m/s. What is the recoil speed of the cannon?
*Sunday, March 29, 2015 by Abby*

**Physics**

A uniform disk of radius 0.5 m and mass 3.9 kg is rotating about its center of mass. Its moment of inertia about its center of mass is I=(1/2)mR^2. Its angular velocity as a function of time is given by (t)=7kt^6/t1^7 where k = 3.8 rad and t1= 5 s. Find the magnitude of the ...
*Sunday, March 29, 2015 by Esha*

**Physics**

A motorist is trying to loosen a stubborn lugnut by standing on the end of a wrench. The wrench is inclined 33.8 degrees above the horizontal and the distance from the center of the nut to the end of the wrench is 0.60 m. Assuming the motorist does not bounce up and down on ...
*Sunday, March 29, 2015 by Michelle*

**Physics**

A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.420 . Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
*Sunday, March 29, 2015 by Kristyn*

**Physics**

The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × ...
*Sunday, March 29, 2015 by Kristyn*

**Physics**

An eagle is flying horizontally at 5.8 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the speed to double again?
*Sunday, March 29, 2015 by KS*

**physics**

A proton is acted on by an uniform electric field of magnitude 233 N/C pointing in the positive x direction. The particle is initially at rest. (a) In what direction will the charge move? (b) Determine the work done by the electric field when the particle has moved through a ...
*Sunday, March 29, 2015 by mathew*

**physics**

a body projected with velocity 30m/s an angle 30¡ã with horizontal maximum height attained by he object is.........?
*Sunday, March 29, 2015 by yogesh*

**physics**

(a) A charged particle accelerates as it moves from location A to location B. If V A = 170 V and V B = 210 V, what is the sign of the charged particle? positive negative (b) A proton gains electric potential energy as it moves from point 1 to point 2. Which of the following is...
*Sunday, March 29, 2015 by mathew*

**physics**

Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 8.50 cm from the zero volt plate (and 1.50 cm from the other) is 450 V? kV/m (b) What is the voltage ...
*Sunday, March 29, 2015 by mathew*

**Physics**

a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 212 m. If the red car has a constant velocity of 23.0 km/h, the cars pass each other at x = 44.2 m. On the other ...
*Sunday, March 29, 2015 by Mike*

**physics**

An ideal gas has an initial volume of 500 cm3 , an initial temperature of 20◦C, and an initial pressure of 2 atm. What is its final pressure if the volume is allowed to expand to 1000 cm3 while the temperature increases to 60◦C?
*Sunday, March 29, 2015 by khalifah*

**physics**

If 50 g of ice at −5 ◦C is mixed into 300 g of water at 60◦C in a completely insulated container, what is the final equilibrium temperature of the water? Why did we insist on the container being completely insulated?
*Sunday, March 29, 2015 by bri*

**physics**

A spherical buoy of radius 25 cm and mass 8 kg sits in sea water of density 1025 kg/m3 . At low tide its anchoring chains have got tangled. What is the maximum tension force this chain may have to withstand at high tide? Assume calm conditions.
*Sunday, March 29, 2015 by bri*

**physics**

1) What average power is required for a runner with a mass of 85 kg to reach a speed of 8 m/s from a stationary start during a time of 2 s? 2) A 1000 kg car travels east at 30 m/s and collides with a 3400 kg truck travelling south at 20 m/s. After the collision the two ...
*Sunday, March 29, 2015 by k*

**physics**

A simple harmonic oscillator executes motion whose amplitude is 0.20 m and it completes 60 oscillations in 2 minutes. i) Calculate its time period and angular frequency. ii) If the initial phase is 45°, write expressions for instantaneous displacement, velocity and ...
*Sunday, March 29, 2015 by meenu*

**physics dicussion question**

is there any physics teachers available to help right now?
*Saturday, March 28, 2015 by abs*

**Medical physics**

1.A hypodermic needle of lenght 0.020m and inner radius 3.0 x10^-4 is used to force water at 20 degree celcious into the air at a flow rate of 1.0 x10^-7m^2 s-1 (a) what is the average velocity in the needle?(assume laminar flow), (b) what is the pressure drop necessary to ...
*Saturday, March 28, 2015 by JAMES*

**physics**

The steel I-beam in the drawing has a weight of 1.75 × 103 N and is being lifted at a constant velocity. The angles are at 70 degrees. What is the tension in each cable attached to its ends?
*Saturday, March 28, 2015 by Kristyn*

**physics**

A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.420 . Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
*Saturday, March 28, 2015 by Kristyn*

**physics**

A 46.2-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.566 and 0.440, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?
*Saturday, March 28, 2015 by Kristyn*

**physics**

The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
*Saturday, March 28, 2015 by Kristyn*

**physics**

A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 4.6 m/s, hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the adjacent building is ...
*Saturday, March 28, 2015 by Kristyn*

**physics**

A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
*Saturday, March 28, 2015 by Kristyn*

**physics**

A flat (unbanked) curve on a highway has a radius of 220m. A car rounds the curve at a speed of 25m/s. What is the minimum coefficient of friction that will prevent sliding?
*Saturday, March 28, 2015 by Shelby *

**physics**

An unstretched ideal spring hangs vertically from a fixed support. A 0.4 kg object is then attached to the lower end of the spring. The object is pulled down to a distance of 35cm below the unstretched position and released from rest at t=0s. A graph of the subsequent vertical...
*Saturday, March 28, 2015 by Helly*

**physics**

Calculate the net charge on a substance consisting of a combination of 6.7 ✕ 10^13 protons and 3.0 ✕ 10^13 electrons.
*Saturday, March 28, 2015 by Makenzie*

**physics**

A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
*Saturday, March 28, 2015 by Kristyn*

**physics**

The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
*Saturday, March 28, 2015 by Kristyn*

**physics**

A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
*Saturday, March 28, 2015 by Kristyn*

**Medical physics**

1.A hypodermic needle of lenght 0.020m and inner radius 3.0 x10^-4 is used to force water at 20 degree celcious into the air at a flow rate of 1.0 x10^-7m^2 s-1 (a) what is the average velocity in the needle?(assume laminar flow), (b) what is the pressure drop necessary to ...
*Saturday, March 28, 2015 by JAMES*

**Physics**

A particle starts from the origin at t = 0 with an initial velocity of 4.8m/s along the positive x axis.If the acceleration is (-2.5 i^ + 4.3 j^)m/s2, determine (a)the velocity and (b)position of the particle at the moment it reaches its maximum x coordinate Express your ...
*Saturday, March 28, 2015 by Jackson*

**physics**

mercury rotates about its own axis once every 58.6 Earth days. a satellite orbits mercury once every murcurian day. how high is this satellite above mercury's surface? mass of mercury = 3.2x10^23 kg. the radius of mercury is 2400km.
*Saturday, March 28, 2015 by khalifah*

**mathematical physics**

Obtain the temperature distribution u(x,t) in a literally insulated rod of length L if both ends on the road are kept at 0°c and the initial temperature distribution in the bar is: u( x, 0 ) = 6sin[πx/L]
*Saturday, March 28, 2015 by gourav*

**mathematical physics**

Separate the following partial differential equation into a set of three ODEs by the method of separation of variables: d^2u/dt^2 =c^2,[d^2u/dr^2+1/r du/dr+1/r^2 d^2u/d theeta^2]
*Saturday, March 28, 2015 by gourav*

**mathematical physics**

Show that :(I) u = e^xsiny is a solution of Laplace's equation. (ii) u = x^2+t^2 is a solution of the wave equation.
*Saturday, March 28, 2015 by gourav*

**mathematical physics**

A series circuit consists of a resister with R = 200 ohm, an inductor with L = 1H, a capacitor with C = 0.002F, and a 12V battery. If the initial charge and current are both 0, find the charge and current at time t.
*Saturday, March 28, 2015 by gourav*

**mathematical physics**

Solve the initial value problem. d^2x/dt^2+2dx/dt-3x =0, x(2π) = 1, x(2π) = 13
*Saturday, March 28, 2015 by gourav*

**mathematical physics**

Show that : vector del(r^2) = 2vector r
*Saturday, March 28, 2015 by gourav*

**mathematical physics**

For any two vectors u and v show that : ( Vector u.vector v )^2 = [(vector u× vector v)×vector v ].vector u = u^2v^2
*Saturday, March 28, 2015 by gourav *

**Physics**

A person pushes on a 56-kg refrigerator with a horizontal force of -260 N; the minus sign indicates that the force points in the -x direction. The coefficient of static friction is 0.58. (a) If the refrigerator does not move, what are the magnitude and direction of the static ...
*Friday, March 27, 2015 by Physics2hard4me*

**Physics**

At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety device to stop the train so that it will not plow through the station if the engineer misjudges the stopping distance. While waiting, you wonder what ...
*Friday, March 27, 2015 by Martez *

**Algebra 1**

A physics student stands on top of a hill that has an elevation of 56 meters. He throws a rock and it goes up into the air and then falls past him and lands on the ground below. The path of the rock can be modeled by the equation - y=-0.04x^2+1.3x+56 where x is the horizontal ...
*Friday, March 27, 2015 by Steve*

**mathematical physics**

Obtain the temperature distribution u(x,t) in a laterally insulated rod of length L if both ends on the road are kept at 0°c and the initial temperature distribution in the bar is: u(x,0) = 6sin[πx/L]
*Friday, March 27, 2015 by gourav *

**mathematical physics**

Show that : (I) u = e^xsiny is a solution of Laplace's equation. (ii) u= x^2+t^2 is a solution of the wave equation.
*Friday, March 27, 2015 by gourav *

**mathematical physics**

Solve the initial initial value problem d^2x/dt^2+2DX/dt-3x =0, x(2π) = 0, x(2π) = 13
*Friday, March 27, 2015 by gourav *

**PHYSICS**

A swimmer, capable of swimming at a speed of 1.24 m/s in still water (i.e., the swimmer can swim with a speed of 1.24 m/s relative to the water), starts to swim directly across a 2.24-km-wide river. However, the current is 0.553 m/s, and it carries the swimmer downstream. (a) ...
*Friday, March 27, 2015 by Physics2hard4me*

**physics**

A 2.50m -long, 450g rope pulls a 10.0kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.50m/s2 . How much force pulls forward on the rope?
*Friday, March 27, 2015 by Matt*