# A block weighing 70.7 N rests on a plane inclined at 21.6° to the horizontal. The coefficient of the static and kinetic frictions are 0.23 and 0.12 respectively. What is the minimum magnitude of the force F, parallel to the

22,562 questions, page 63-
## physics

An object has a mass of 2kg and rests on a surface where the coefficient of friction is .2. (a) Find the acceleration of 10 m/sec squared (b) Assume Vi=0, how long does it take to travel 100m? (c) What is the velocity at this time?

*asked by Elise on February 2, 2011* -
## Physics

"Two blocks lie on a triangle as shown in the figure. Block m has a mass of 8 kg and block P has a mass of 21 kg. Assume the inclines and pulleys are frictionless find the tension in the string." The two blocks are on opposite side of an isosceles

*asked by Courtney on June 14, 2017* -
## MATH

A ball is thrown with an initial velocity of v feet per second, at an angle of θ with the horizontal (see figure in the website below). Find the vertical and horizontal components of the velocity. (Let v = 70 and θ = 40°. Round your answers to two

*asked by ghost on February 25, 2019* -
## trig

A plane has an airspeed of 200 miles per hour and a heading of 28.0°. The ground speed of the plane is 207 miles per hour, and its true course is in the direction of 38.0°. Find the speed and direction of the air currents, assuming they are constants.

*asked by bryan on November 29, 2012* -
## Physics

A remote control model airplane connected to a string is flown in a circle with a radius of 0.348 m about a fixed axis with an angular velocity of +1.47 rad/s. The plane’s throttle is increased, so that it acquires an angular acceleration of 2.18 rad/s2.

*asked by Anonymous on April 23, 2015* -
## Calculus

A plane flying with a constant speed of 5 km/min passes over a ground radar station at an altitude of 4 km and climbs at an angle of 35 degrees. At what rate, in km/min is the distance from the plane to the radar station increasing 10 minutes later? I got

*asked by Z32 on September 25, 2009* -
## Chemistry(Please help, thank you!)

For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass

*asked by Hannah on October 24, 2011* -
## physics

A 8.72 kg particle moves from the origin to position C , having coordinates x = 2.04 m and y = 2.04 m as shown in Figure 1. A particle moving in a horizontal plane from the origin to position C experiences a friction force with constant magnitude 2.32 N.

*asked by felix on November 19, 2018* -
## PHYSICS

A 16 kg block slides down a 30 degree frictionless incline where it is stopped by a strong Hook's Law spring at the bottom. The spring constant is k = 9.8 x10^4 N/m. If the block slides 9 m from the point where it was released (from rest) to the point

*asked by Jason on April 20, 2010* -
## physics

A playground carousel (“merry-go-round”) is free to rotate frictionlessly in the horizontal plane (and air resistance is negligible). Without riders, the carousel has a moment of inertia of 152 kg·m2. But there is a single rider, initially standing

*asked by becca on November 1, 2010* -
## physics

Forces of 1,5,3, and F newtons are applied to a weightless board that rests on a fulcrum. The board doesn't rotate-what's the magnitude of the force F?

*asked by Jen on May 24, 2012* -
## Physics

An arrow is shot at an angle 35◦ with the horizontal. It has a velocity of 47 m/s.The acceleration of gravity is 9.8 m/s^2.What horizontal distance will it travel? Answer in units of m

*asked by Marsha on December 31, 2012* -
## physics

A dock worker loading crates on a ship ﬁnds that a 29 kg crate, initially at rest on a horizontal surface, requires a 90 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60 N is required to keep it

*asked by sam on December 3, 2013* -
## physics

A dock worker loading crates on a ship ﬁnds that a 29 kg crate, initially at rest on a horizontal surface, requires a 90 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60 N is required to keep it

*asked by sam on December 3, 2013* -
## Physcis

An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b.

*asked by Josh on September 18, 2010* -
## Math

How do i find the length of a projection of a vector A=3x+y+2z on the xy plane? and how do i find the unit vector in the xy plane that is perpendiculer to vector A?

*asked by larry on October 31, 2014* -
## physics

A 0.50 kg ball that is tied to the end of a 1.1 m light cord is revolved in a horizontal plane with the cord making a 30° angle, with the vertical (a) Determine the ball's speed. (b) If, instead, the ball is revolved so that its speed is 4.0 m/s, what

*asked by tj on November 22, 2010* -
## physics problem that i neeeed help with!

A person lifts a 3.8 kg cement block a vertical distance 0.9 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process. ? J (by person) ? J (by force of gravity)

*asked by brittany on April 15, 2010* -
## Math

A 3 by 3 array of blocks is painted so that every other row, starting with row 1, begins with a red block, and the alternate rows begin with a black block. Does the 12th row begin with red or black?

*asked by Cons on July 24, 2017* -
## physics

A person lifts a 5.5 kg cement block a vertical distance 1.1 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process. J (by person) J (by force of gravity)

*asked by Anonymous on January 3, 2011* -
## college chem

In this experiment a hot metal block at 100oC is added to cold water in a calorimeter. The heat lost by the metal block equals the heat gained by the water and the two end up at the same temperature. In one experiment, the mass of the metal block is 89.5

*asked by Sarah on October 8, 2009* -
## MATH

A ball is thrown with an initial velocity of v feet per second, at an angle of θ with the horizontal (see figure in the link below). Find the vertical and horizontal components of the velocity. (Let v = 70 and θ = 40°. Round your answers to two decimal

*asked by Anonymous on March 1, 2019* -
## physics

Water is flowing into a factory in a horizontal pipe with a radius of 0.0223 m at ground level. This pipe is then connected to another horizontal pipe with a radius of 0.0400 m on a floor of the factory that is 10.6 m higher. The connection is made with a

*asked by reuben on June 23, 2014* -
## statistics

Potatoes - Samples: Assume the weights of Farmer Carl's potatoes are normally distributed with a mean of 8.0 ounces and a standard deviation of 1.3 ounces. He bags his potatoes in groups of 6. You buy a bag and the total weight is 42 ounces. Here we

*asked by Sara on October 20, 2014* -
## general physics

A solid concrete block weighs 160 N and is resting on the ground. Its dimensions are 0.400 m x 0.240 m x 0.0950 m. A number of identical blocks are stacked on top of this one. What is the smallest number of whole bricks (including the one on the ground)

*asked by please help with these practice problems on July 20, 2013* -
## physics

an airplane flying north is observed from the ground. it's velocity is 225 m/s north. the pilot who is flying the plane measures a velocity of 250m/s north. what is the velocity of the wind that affects the plane

*asked by anna on October 16, 2017* -
## geometry

the pilot of a plane flying 2000 meters above sea level observes two ships in line due east of the plane. the angles of depression of the line of sight of the pilot to the two ships are 42 degrees and 30 degrees. how far apart are the two ships at the time

*asked by Anonymous on June 3, 2010* -
## Physics

A 200-loop coil of cross sectional area 8.5 lies in the plane of the paper. Directed out of the plane of the paper is a magnetic field of 0.06 T. The field out of the paper decreases to 0.02 T in 12 milliseconds. (a) What is the magnitude of the change in

*asked by Liz on March 12, 2013* -
## Math - repost

The angles of elevation θ and ϕ to an airplane are being continuously monitored at two observation points A and B, respectively, which are 5 miles apart, and the airplane is east of both points in the same vertical plane. (Assume that point B is east of

*asked by anonymous on March 17, 2019* -
## Calculus

Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@,

*asked by mark on September 22, 2008* -
## calculus

Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@,

*asked by mark on September 22, 2008* -
## calculus

Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@,

*asked by mark on September 21, 2008* -
## Physics please clarify

Posted by Mary on Monday, September 24, 2007 at 10:11pm. A cube is located with one corner at the origin of an x, y, z, coordinate system. One of the cube's faces lies in the x, y plane, another in the y, z plane, and another in the x, z plane. In other

*asked by Mary on September 25, 2007* -
## Physics

An aircraft has a cruising speed of 100 m/s On a particular day, a wind is blowing from the west at 75.0 m/s If the plane is pointed due north, what would be the magnitude and direction of the velocity relative to the ground? If the pilot wishes to have a

*asked by Niki on October 16, 2013* -
## childcare

An appropriate science activity for an infant would be A. weighing and measuring other infants. B. planting a flower. C. feeling different textured objects. D. caring for pets of the facility.

*asked by Heather on April 7, 2011* -
## physics

A uniform chain 10m long and weighing 6 kg permetre hangs vertically.calculate the work required to wind it up.. Plzz solve it

*asked by arya on November 23, 2015* -
## Science

if a person weighing 550 newtons takes 15 seconds to walk up the staircase that is 9.5 meters high, what is the power needed to perform the action

*asked by Briana on March 24, 2009* -
## physics

A shop sign weighing 230 N is supported by a uniform 115 N beam as shown in Fig. 9-54. Find the tension in the guy wire.

*asked by charlse on November 16, 2009* -
## physics

A bucket filled with water weighing 50kg is raised from a well of depth 100m.if the linear density of the rope is 1kg per metre.then the work done is

*asked by Thousif on September 22, 2017* -
## Chem

A sample of oxalic acid, H2C2O4, weighing 1.294 g is placed in a 100.0 mL volumetric flask, which is then filled to the mark with water. What is the molarity of the solution?

*asked by Amis on October 1, 2008* -
## childcare

an appropriate science activity for an infant would be: a. weighing and measuring other infants. b. planting a flower. c.feeling different textured objects. d.caring for pets of the facility.

*asked by sara on November 30, 2010* -
## physics

a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings

*asked by marv on March 29, 2012* -
## Pharmacy Math

The dose of gentamicin sulfate is 1.7mg/kg. How many mls of an injectable solution containing 40mg/ml should be administered to a person weighing 220 pounds? Any help is appreciated.

*asked by David on November 3, 2008* -
## Math

The air speed of a plane is 150 mph. If the plane traveled the same distance in two hours with the wind as it flew in 3 hours against the wind, what was the wind speed?

*asked by Raquel on November 28, 2016* -
## Math

Which of the following is true if a pentagon tessellates a plane? a. A pentagon never tessellates a plane b. All of its sides must be the same length c. It must be a regular pentagon d. It has one pair of parallel sides I was thinking its (c) but not sure.

*asked by Rena Lambides on January 19, 2011* -
## Math

A plane flys 425 miles with the wind and 350 miles against the wind in the same length of time if the speed of the wind is 15 mph what is the speed of the plane

*asked by Brandon on March 8, 2013* -
## Physics

At an air show, a jet plane has velocity components vx = 695 km/h and vy = 440 km/h at time 4.85s and vx= 933km/h and vy = 465 km/h at time 7.12 s. For this time interval, find (a) the x and y components of the plane’s average acceleration and (b) the

*asked by mo on January 22, 2012* -
## Physics

At an air show, a jet plane has velocity components vx = 695 km/h and vy = 440 km/h at time 4.85s and vx= 933km/h and vy = 465 km/h at time 7.12 s. For this time interval, find (a) the x and y components of the plane’s average acceleration and (b) the

*asked by mo on January 22, 2012* -
## physics

a 840 N crate rests on the floor how much work is required to move it at constant speed 5.5m along the floor against a friction force 180 N?

*asked by brl on June 21, 2012* -
## Physics

A sled rests at the top of a 25 degree slope that is 80m in length. If uk = .25 and the velocity at the bottom of the incline is 20m/s then what is the weight of the sled?

*asked by Willy on August 1, 2012* -
## maths

a ladder 12 m long rests aganist a wall if it reaches the wall at a height of root 63m then find the angle of elevation

*asked by meena on January 8, 2016* -
## 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?

*asked by Physics Student on May 16, 2014* -
## maths

a laddder 9m long rests against a vertical wall. if the base of the ladder is 2m from the wall, find the angle mabe by the ladeer with the ground

*asked by jayr on February 26, 2015* -
## math

A roadway rises 55ft in horizontal distance of 1/2 mile (1mile=5280ft) Find the tangent of the angle that it makes with the horizontal.

*asked by Anonymous on June 19, 2012* -
## trig

A roadway rises 55ft in horizontal distance of 1/2 mile (1mile=5280ft) Find the tangent of the angle that it makes with the horizontal.

*asked by Anonymous on June 19, 2012* -
## physics

At what angle to the horizontal must the nozzle of a machine gun be kept when firing to obtain a maximum horizontal range for the bullet(show your working)

*asked by Kay on February 24, 2013* -
## College Physics

A 1300-kg car moving on a horizontal surface has speed v=65 km/h when it strikes a horizontal coield spring and is brought to rest in a distance of 3.0m

*asked by Jake on October 5, 2016* -
## physics

a body is projected at an angle with the horizontal with an initial of 500 m/s. 4 seconds later it hits the ground. find theta and the horizontal range.

*asked by Elise on December 19, 2010* -
## calculus

A missile is fired at an angle of 75 from the horizontal. At one point, its speed was 900 mph. Find its horizontal velocity in miles per minute

*asked by d on April 1, 2011* -
## physics

A strong child pulls a sled with a force of 108 N at an angle of 33.6° above the horizontal. Find the vertical and horizontal components of this pull.

*asked by Byron on January 19, 2011* -
## Physics

In its approach to an airport runway, an airplane of mass 1.24 x 10^5 kg has a velocity of 75.5 m/s [11.1 degrees below the horizontal]. Determine the horizontal and vertical components of its momentum.

*asked by Jordge on November 5, 2010* -
## trig

A missile is fired at an angle of 85 from the horizontal. At one point, its speed was 1,000 mph. Find its horizontal velocity in miles per minute

*asked by buho on August 4, 2010* -
## physics

A 40-kg box is being pushed along a horizontal smooth surface. The pushing force is 15 N directed at an angle of 15° below the horizontal. What is the magnitude of the acceleration (in m/s2) of the crate?

*asked by Mazdaly on April 15, 2015* -
## Physics

When a block slides a certain distance down an incline the work done by gravity is 300 J. What is the work done by gravity if this block slides the same distance up the incline? a) 300 J b) zero c) -300 J d) It cannot be determined without knowing the

*asked by Tammy on March 25, 2007* -
## Physics

Hi I am having difficulty with this question: Consider a simple “system” of a thin lens with focal length 12 cm, an input plane at 25 cm in front of the lens and an output plane at 11 cm beyond the lens. a) Find the matrix for the simple system b) Why

*asked by John J.B on March 12, 2016* -
## Algebra 2

Worldwide Airlines flies from Lakeside to Whichitfalls in 4 hours with a tail wind, The return trip against the wind takes 5 hours. Whichitfalls is 5040km from Lakeside. Find the speed of the plane and the velocity of the wind. Would you get on the plane?

*asked by Alex on August 31, 2014* -
## physics

A 23 kg chair initially at rest on a horizontal ﬂoor requires a 370 N horizontal force to set it in motion. Once the chair is in motion, a 332 N horizontal force keeps it moving at a constant velocity. The acceleration of gravity is 9.81 m/s 2 . a) What

*asked by Anonymous on October 17, 2012* -
## physics

A horizontal force of 804 N is needed to drag a crate across a horizontal floor with a constant speed. You drag the crate using a rope held at an angle of 32° (from the horizontal). (a) What force do you exert on the rope? 1 N (b) How much work do you do

*asked by Anonymous on December 12, 2011* -
## physics

A 23 kg chair initially at rest on a horizontal ﬂoor requires a 371 N horizontal force to set it in motion. Once the chair is in motion, a 345 N horizontal force keeps it moving at a constant velocity. The acceleration of gravity is 9.81 m/s 2 . a) What

*asked by Anonymous on December 19, 2012* -
## physics

A 29 kg chair initially at rest on a horizontal floor requires a 375 N horizontal force to set it in motion. Once the chair is in motion, a 345 N horizontal force keeps it moving at a constant velocity. The acceleration of gravity is 9.81 m/s2 . a) What is

*asked by hope on November 17, 2011* -
## physics

A gunman standing on a sloping ground fires up the slope. The initial speed of the bullet is v0= 390 m/s. The slope has an angle α= 19 degrees from the horizontal, and the gun points at an angle θ from the horizontal. The gravitational acceleration is

*asked by JuanPro on January 10, 2014* -
## Physics

a 96 kg clock initially at rest on a horizontal floor requires a 605 N horizontal force to set it in motion. After the clock is in motion a horizontal force of 547 N keeps it moving with a constant velocity. the acceleration of gravity is 9.81 m/s2 find

*asked by Susan on October 11, 2012* -
## physics

A projectile is launched at an angle of 30 to the horizontal with a speed of 30 m/s. How does the horizontal component of its velocity 1.0 s after launch compare with its horizontal component of velocity 2.0 s after launch?

*asked by Anonymous on August 5, 2014* -
## Physics

A projectile is launched at an angle of 30 to the horizontal with a speed of 30 m/s. How does the horizontal component of its velocity 1.0 s after launch compare with its horizontal component of velocity 2.0 s after launch?

*asked by Anonymous on August 3, 2014* -
## Physics

A projectile is launched at an angle of 30 to the horizontal with a speed of 30 m/s. How does the horizontal component of its velocity 1.0 s after launch compare with its horizontal component of velocity 2.0 s after launch?

*asked by Anonymous on August 3, 2014* -
## Physics

*asked by Anonymous on August 2, 2014* -
## Physics

How would I find final velocity at the top of an inclined ramp with a given angle theta?

*asked by Maddie on December 6, 2017* -
## math

A Boeing 747 jet takes off from Boston's Logan Airport, which is at sea level, and climbs to a cruising altitude of 27,000 ft at a constant rate of 1400ft/min. A.) write a linear equation for the height of the plane in terms of the time after takeoff. B.)

*asked by kiley on March 15, 2010* -
## prealgbra

charlie is at a small airfied watch for the approach of a a small plane with engine trouble. he sees the plane at an angle of elvation of 32. at the same time, the pilot radios charlie and reports the planes altitude is 1,700 feet. Charlies eyes are 5.2

*asked by shania on June 28, 2012* -
## Trigonometry law of cosine

A plane is flying with an airspeed of 200 miles per hour and heading 150°. The wind currents are running at 30 miles per hour at 175° clockwise from due north. Use vectors to find the true course and ground speed of the plane. (Round your answers to the

*asked by NEED HELP ASAP on April 7, 2014* -
## chemistry

I have two problems that I'm stumped on. I know the correct anwers but I'm having problems coming up with the co rrect anwsers. Here are the problems: 1) Magnesium has a density of 1.7g/cm^3 and iron has density of 7.9 g/cm^3. A block of iron has a mass of

*asked by pat on September 29, 2007* -
## Science

Two trains are traveling towards each other, starting 100 kilometers apart. One train travels at 40 kilometers per hour while the other travels at 60 kilometers per hour. The plane starts flying at 90 kilometers per hour, starting from the location of the

*asked by Edwin on March 29, 2017* -
## physics

A very narrow beam of white light is incident at 40.40° onto the top surface of a rectangular block of flint glass 11.8 cm thick. The indices of refraction of the glass for red and violet light are 1.637 and 1.671, respectively. Calculate the dispersion

*asked by rudi on August 25, 2010* -
## physics

A 126 kg block is released at a 6.8 m height as shown. The track is frictionless. The block travels down the track, hits a spring of force constant k = 1999 N/m. The acceleration of gravity is 9.8 m/s 2 .moreno (lm35839) – Homework 16A – smith –

*asked by Anonymous on January 17, 2013* -
## English

Choose the best paraphrase of these lines from the "The Sidewalk Racer" A)I wish I could move as fast as a car or a plane, but I cant because I am only a human. B)I feel as if I am botha single engine plane and a car.(I pick this) C)With my one-engine

*asked by trololololololololol on March 23, 2016* -
## American Goverment

Liberalism rests in a conception of equality whereby the government (Points : 1) must not choose one person’s good over another. must ensure that we all have the same possessions. must provide everybody with healthcare. must redistribute wealth in order

*asked by Christopher on May 4, 2015* -
## Physics

A block of wood with volume V floats in water with 0.68V submerged. In oil the block floats with 0.86V of its volume submerged. What's the density of the wood?

*asked by Ray on November 17, 2009* -
## Physics

A copper (Cu) weight is placed on top of a 0.24 kg block of wood (density = 0.60*10^3 kg/m3) floating in water. What is the mass of the copper if the top of the wood block is exactly at the water's surface?

*asked by Anon on January 24, 2012* -
## physics

A copper (Cu) weight is placed on top of a 0.24 kg block of wood (density = 0.60*10^3 kg/m3) floating in water. What is the mass of the copper if the top of the wood block is exactly at the water's surface?

*asked by HELP ME on January 24, 2012* -
## Physics

A(n) 94 kg clock initially at rest on a horizontal floor requires a(n) 697 N horizontal force to set it in motion. After the clock is in motion, a horizontal force of 530 N keeps it moving with a constant velocity. The acceleration of gravity is 9.81 m/s2

*asked by Ovidio on October 19, 2017* -
## Physical Science

An elephant drags a tree trunk along a rough horizontal surface by means of an attached rope which makes an angle of 30° with the horizontal. The force in the rope is 4 000N. CALCULATE the horizontal component of the force exerted by the rope on the tree

*asked by Angie on February 14, 2017* -
## calculus

A plane that is flying horizontally at an altitude of 6 kilometers and a speed of 570 kilometers per hour passes directly over a radar station. How fast is the distance between the plane and the radar station increasing when the distance between the two is

*asked by Matr on October 28, 2013* -
## math

a small plane heads west at 320 kph. there is a north wind blowing at 24 kph. what is the velocity (2 parts!) of the plane with respect to the ground? would the answer be 320.9 kph? but there are two parts to the answer. what is the other part?

*asked by clarice on October 5, 2015* -
## Calc

A plane that is flying horizontally at an altitude of 6 kilometers and a speed of 680 kilometers per hour passes directly over a radar station. How fast is the distance between the plane and the radar station increasing when the distance between the two is

*asked by Georgia on October 20, 2009* -
## physics

a 250 kg crate is placed on an adjustable incline plane. If the crate slides down the incline with an exceleration of 0.7 m/s squared when the incline angle is 25 degrees, then what sould the incline angle be in order for the crate to slide down the plane

*asked by uta on October 22, 2011* -
## physics

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a

*asked by mark on October 10, 2013* -
## Physics

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a

*asked by Anonymous on October 10, 2013* -
## physics

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a

*asked by anon on October 11, 2013* -
## Physics

A .22 rifle bullet, traveling at 373m/s, strikes a block of soft wood, which it penetrates to a depth of 0.125m. The block of wood is clamped in place and doesn't move. The mass of the bullet is 1.90. Assume a constant retarding force.How much time is

*asked by Anonymous on February 8, 2010* -
## Calculus

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another 5 miles and is going 500 mph. At that moment, how fast is the

*asked by George on November 11, 2008*

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