Monday

December 22, 2014

December 22, 2014

Number of results: 30,103

**Sports**

Does San Francisco have any foot ball or basketball teams?
*October 19, 2013 by Anonymous*

**physics**

Which of the following properties of a ball is conserved as it falls freely in a vacuum?
*November 5, 2013 by chykins*

**ball state**

Write the equation of the line passing through points (3, -2) and (6, 4).
*February 9, 2014 by Anonymous*

**physics**

A person throws a 2.50 lb stone into the air with an initial upward speed of 15.0 ft/s. Part A- Make a free-body diagram of the forces for this stone after it is free of the person's hand and is traveling upward Part B - Make a free-body diagram of the forces for this stone at...
*February 2, 2012 by sam*

**Physics**

A rocket moves upward for 3 seconds After 2 seconds, its speed is 10 m/s After another 1 second, its speed is 20 m/s Find instantaneous acceleration at t=2.5
*September 23, 2009 by Jenn*

**Physics**

What is the speed of a wave with wavelength=150 m and T=9.8 s, when it is moving through water 40 m deep? What is its speed when the wave reaches water of 5 m depth?
*March 22, 2010 by Krysten*

**Oceanography**

What is the speed of a wave with wavelength=150 m and T=9.8 s, when it is moving through water 40 m deep? What is its speed when the wave reaches water of 5 m depth?
*March 22, 2010 by Krysten*

**physics**

You jog at 6.0 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.0 mi/h?
*September 9, 2010 by Anonymous*

**physics**

You jog at 6.0 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.0 mi/h?
*September 9, 2010 by Anonymous*

**physics**

You jog at 6.0 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.0 mi/h?
*September 9, 2010 by Anonymous*

**physics**

A rock is thrown horizontally with a speed of 5.9 m/s from a height of 63.5 meters from the ground below. With what vertical speed does the rock hit the ground?
*November 3, 2010 by Anonymous*

**Physics**

a 10 kg gun recoils with a speed of 0.1 meter per second as it fires a 0.001kg bullet. what is the speed of the bullet as it leaves the gun
*January 13, 2011 by Diana*

**AP Physics**

A transverse wave is traveling with a speed of 500 m/s on a horizontal string. If the tension in the string is increased by a factor of 2, what is the speed of the wave?
*February 9, 2011 by James*

**physics**

A transverse wave is traveling with a speed of 500 m/s on a horizontal string. If the tension in the string is increased by a factor of 2, what is the speed of the wave?
*February 10, 2011 by help please*

**Physics**

A transverse wave is traveling with a speed of 500 m/s on a horizontal string. If the tension in the string is increased by a factor of 2, what is the speed of the wave?
*February 10, 2011 by help please*

**Chemistry**

At2 26.3C, F2 molecules have a certain value of rms speed. At what temperature would the rms speed of O2 molecules be the same?
*October 16, 2011 by Justin*

**physics**

A man of height 1.8m walks away from a lamp at a height of 6m. If the man's speed is 7m/s, find the speed in m/s at which the tip of the shadow moves.
*January 27, 2013 by opy*

**physics**

constant gamma(Y) for the oxygen as well as for hydrogen is 1.40. If the speed of the oxygen is 460 m/s, what will be the speed of the sound in hydrogen at same temperature and pressure
*August 25, 2013 by jay*

**Physics**

A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?
*November 20, 2014 by Ann*

**Physics**

A distant planet has a mass of 0.6400 ME and a radius of 0.9000 RE. What is the ratio of the escape speed from this planet to the escape speed from the earth?
*November 21, 2014 by Ann*

**intermidiate algebra**

pick a car find its top speed. Asusuming that your chosen car reaches its top speed at the top of a ramp, leaving the ramp vertically 20 feet about the ground? 2. When would the car be traveling the fastest? 3.)When would the car be traveling the slowest? 4.) based on the ...
*November 14, 2010 by linda*

**Physics**

A motorist traveling with a constant speed of 15m/s passes a school-crossing corner, where the speed limit is 10m/s. Just as the motorist passes, a police officer on a motorcycle at the corner starts off in pursuit with constant acceleration of 3m/s^2. (a)How much time elapses...
*June 29, 2012 by :)*

**Physics**

A motorist traveling with a constant speed of 15m/s passes a school-crossing corner, where the speed limit is 10m/s. Just as the motorist passes, a police officer on a motorcycle at the corner starts off in pursuit with constant acceleration of 3m/s^2. (a)How much time elapses...
*June 29, 2012 by :)*

**Math Statistics**

An investigational drug study is being conducted. The initial screening phase needs to include enough people so that the final (approved) group has at least 10 patients. The probability of a person being approved for the study is .80. what initial sample size is needed to make...
*June 6, 2009 by Craig*

**Physics**

31m/s is a typical highway speed for a car. At what temperature do the molecules of nitrogen gas have an rms speed of 31m/s? T=[(x^2)*m]/3k so x=31m/s m=N2=2*14=28g=.028kg k=1.38e^-23..I'm keep getting 6.333651477e^10...which is incorrect. What am I missing?
*November 19, 2009 by ana*

**college physics**

A 12100 kg railroad car travels alone on a level frictionless track with a constant speed of 20.5 m/s. A 5850 kg load, initially at rest, is dropped onto the car. What will be the car's new speed? Please help!
*March 14, 2010 by Anonymous*

**Physics**

A car travels at a speed of 25 m/s on a flat stretch of road. The driver must maitain pressure on the accelerator to keep the car moving at a constant speed. Are there any forces doing work on the car? Explain. What is the net force?
*February 3, 2011 by Kourt*

**Physics**

A car travels at a speed of 25 m/s on a flat stretch of road. The driver must maitain pressure on the accelerator to keep the car moving at a constant speed. Are there any forces doing work on the car? Explain. What is the net force?
*February 3, 2011 by Kourt*

**phyics**

A mechanic pushes a(n) 3980 kg car from rest to a speed of v, doing 5107 J of work in the process. During this time, the car moves 29.3m. Neglect friction between car and road. Find the speed v. Answer in units of m/s.
*February 27, 2011 by leslie*

**Physics**

A 340 g bird flying along at 6.0 m/s sees a 14 g insect heading straight toward it with a speed of 30 m/s. The bird opens its mouth wide and enjoys a nice lunch. What is the bird's speed immediately after swallowing?
*November 29, 2011 by Danny*

**physics**

For a scene in a movie, a stunt driver drives a 1.50×10^3kg SUV with a length of 4.00m around a circular curve with a radius of curvature of 0.333 km. The vehicle is to be driven off the edge of a gully 10.0 m wide, and land on the other side 2.96 m below the initial side. ...
*October 11, 2013 by Jen*

**algebra 1b**

the speed of a passenger train is 18mph faster than the speed of a freight train. The passenger train travels 310 miles in the same time it takes the freight train to travel 220 miles. Find the speed of each train passenger train mph and freight train mph
*March 21, 2012 by kay*

**PHysics**

The tip of a helicoptor rotor blade can reach speeds of roughly 300 mph (130 m/s). It takes about 30 seconds to get them up to speed and they have a typical radius of 20 feet (6 m). What is the average angular acceleration of the rotor blades as they get up to speed?
*April 6, 2011 by Paige*

**College Physics**

A hunter wishes to cross a river that is 1.6 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 15 km/h with respect to the water. What is the minimum time necessary for crossing? min
*September 12, 2012 by Dumb-Dumb*

**physics**

A train travels at a constant speed around a curve of radius 225 m. A ceiling lamp at the end of a light cord swings out to an angle of 20.0º throughout the turn. Draw a free body diagram? What is the speed of the train?
*November 20, 2012 by Courtney *

**physics**

n anti-aircraft gun fires a 23.7 kg shell with a muzzle speed of 880 m/s. What magnitude propulsive force was necessary to attain the muzzle speed within the 5.05 m barrel? (Assume constant acceleration and neglect the Earth's gravitational effect.)
*March 20, 2013 by Anonymous*

**CALCULUS-GUYS..PLEASE HELP...THIS DUE TOMORROW..**

An automobile travels at a constant speed around a curve whose radius of curvature is 2000m. What is the maximum allowable speed if the maximum acceptable value for the normal scalar component of acceleration is 1.5m/s^2?
*April 24, 2013 by aimi najwa*

**calculus**

A traveller employs a man to drive him from Sydney to Melbourne. Running costs of the car, which are also paid by the traveller, are k*v^3 dollars per hour, v is the speed and k is a constant. Find the uniform speed that will minimize the total cost of the journey.
*November 17, 2013 by jim_segs*

**science**

If you were riding on a train, which of the following would look as if it is not moving? the conductor walking by you a building you are passing a flying bird<---- a person sitting next to you Which of the following reference points would allow you to observe the speed of a...
*April 13, 2014 by Anonymous*

**Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle '2 = 41° from the neutron's initial direction. The neutron's initial speed is 5.6 105 m/s. Determine the...
*May 30, 2007 by micole*

**davidson high**

a consultant traveled 7 hours to attend a meeting. The return trip took only 6 hours because the speed was 10 miles per hour faster. What was the consultant's speed each way?
*September 25, 2007 by lisa*

**Phiysics**

A rock is dropped from a hotel and strikes the ground with a particular speed. In order, to double the speed at impact, you would have to drop the rock from the hotel at? I say impossible to determine
*March 16, 2009 by Harold*

**Physics**

Although it can't sustain its top speed for more than 8.65 sec, the cheetah can run a distance of 274 m during that time. If a cheetah with a mass of 50.0 kg is moving north at its top speed. what is its momentum?
*November 4, 2009 by abbigail*

**General Physics I**

An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 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 its acceleration?
*October 12, 2010 by Anonymous*

**Physics**

In principle, anytime someone jumps up, the earth moves in the opposite direction. To see why we are unaware of this motion, calculate the recoil speed of the earth when a 65.0 kg person jumps upward at a speed of 1.70 m/s. v=?
*March 8, 2011 by Mely*

**physics**

5) A person on a motor cycle gains a speed of 10kmph to 60kmph in 10 secs. The angular rotation of the needle in the speedometer is about 200 degrees. What will be the angular speed in degrees/sec?
*August 8, 2011 by Anonymous*

**Algebra II**

A plane is headed due west with an air speed of 212 km/h. It it driven from its course by a wind from due north blowing at 23.6 km/h. Find ground speed of the plane and the actual direction of travel.
*November 2, 2011 by Arielle*

**PHYSICS**

A dog escapes from his front yard at 3.15 p.m. and is discovered 3.5 miles from home at 4:50 p.m. What is the dog's average speed in miles per hour? Please let me know if this is correct, if is not, let me know what I did wrong. speed=d/time of travel 3.5/1.35 = 2.59 m/h
*February 4, 2012 by GRISSELL*

**Physics**

. A rock thrown horizontally at a large bell 57.0 m away is heard to hit the bell 4.10 s later. If the speed of sound is 330 m/s, what was the speed (in meters/second) of the rock? (Disregard gravity.)
*February 7, 2012 by Nicole*

**Physics**

A roller coaster reaches the top of the steepest hill with a speed of 3.0 . It then descends the hill, which is at an average angle of 40 and is 50.0 long. Estimate its speed when it reaches the bottom. Assume kinetic friction (uk) = 0.18 .
*March 14, 2012 by Kristina*

**physics**

A roller coaster reaches the top of the steepest hill with a speed of 3.0 . It then descends the hill, which is at an average angle of 36 and is 50.0 long. Estimate its speed when it reaches the bottom. Assume friction coefficint Mk=0.18.
*March 15, 2012 by Mona*

**Math**

Fauzia took 30min to cycle from her house to the cinema. If she cycled the first 3km of the journey at a speed of 150m/min, find her average speed for the remaining 3km of the journey
*March 26, 2012 by Da S*

**physics**

A block initially at rest is allowed to slide down a frictionless ramp and attains a speed v at the bottom. To achieve a speed 3.9 v at the bottom, how many times as high h2 h1 must a new ramp be?
*November 29, 2012 by Anonymous*

**physics**

A person takes a trip, driving with a constant speed of 90 km/h except for a rest stop for 30min. If his average speed is 78 km/h, how much time is spent on the trip and how far does the person travel?
*September 18, 2013 by john*

**Chemistry #26**

where R=8.314 J/(mol·K) and ℳ is molar mass in kilograms per mole. Note that a joule is the same as a kg·m2/s2. What is the rms speed of N2 molecules at 335 K? What is the rms speed of He atoms at 335 K?
*October 13, 2013 by Chelsea*

**Statistics**

Suppose that 50% of people frequently exceed the speed limit. A random sample of 2000 people is surveyed and 55% indicate that they frequently speed. What is the value of the population percent given to you in the problem?
*April 9, 2014 by Mea*

**physics**

Ige confused, the truck driver sound the horn of the truck, which has a frequency of 260HZ. The speed of sound in air is 340m/s. an observer hears the sound while traveling in a bus toward the truck at a speed of 30m/s. a) what is the wavelength of the sound the whisle emits? ...
*January 14, 2010 by guli*

**physics**

You are a member of an alpine rescue team and must get a box of supplies, with mass 3.00kg , up an incline of constant slope angle 30.0∘ so that it reaches a stranded skier who is a vertical distance 2.90m above the bottom of the incline. There is some friction present; ...
*October 24, 2013 by HELP*

**Physics**

As Section 27.5 discusses, sound waves diffract or bend around the edges of a doorway. Larger wavelengths diffract more than smaller wavelengths. (a) The speed of sound is 343 m/s. With what speed would a 57.0 kg person have to move through a doorway to diffract to the same ...
*July 21, 2012 by Beth*

**physics**

One strategy in a snowball ﬁght is to throw a snowball at a high angle over level ground. While your opponent is watching this ﬁrst snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the ﬁrst. Assume both ...
*December 16, 2012 by Emily*

**Chemistry**

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? Thanks Responses Chemistry - DrBob222, Thursday, February 12, 2009 at 10:00pm Let's call acetic acid HAc. Then the ionization is HAc ==> H^+ + Ac^- We will call the initial concn of ...
*February 12, 2009 by Chemistry - Repost for DrBob222*

**Physics**

Answer in m/s. The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance 88 cm apart on the same axle. From the angular displacement 18.4 degrees of the two bullet holes in the disks and the rotational ...
*April 15, 2009 by Amanda*

**Physics**

Answer in m/s. The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance 88 cm apart on the same axle. From the angular displacement 18.4 degrees of the two bullet holes in the disks and the rotational ...
*April 15, 2009 by Amanda*

**physics**

rank higest to lowest air drag? 1)a 5lb lead block teraveling at 95% terminal speed. 2a 5lb styrofoam block at terminal speed? 3)a10lb styrofoam block traveling faster than terminal speed? 4)a 10lb styrofoam block at terminal speed? put in orderfrom least air drag,2nd least ...
*January 26, 2012 by taylur*

**physics**

A person is to run a circular track with a radius of 93 meters. The person starts at a certain spot and runs 3 and 1/2 times around the track in a time of 227 seconds. Find the magnitude of average velocity for this trip (|vav|) and find the average speed for this trip. Then ...
*September 1, 2011 by Jeff*

**physics**

A person is to run a circular track with a radius of 93 meters. The person starts at a certain spot and runs 3 and 1/2 times around the track in a time of 227 seconds. Find the magnitude of average velocity for this trip (|vav|) and find the average speed for this trip. Then ...
*September 3, 2011 by Marc*

**calculus**

The position, in feet, of a target is given by s(t)=250-3t+9t^2+2t^3, where t is the time in seconds. The origin of coordinates is at the point where an observer stands, and the positive direction of movement is that one pointing EAST from the origin. What is the initial ...
*December 9, 2014 by Jane*

**chemistry**

On this problem I keep getting the wrong answer. I am subtracting the initial concentration of Cl2 by the equilibrium concentration then using the difference to subtract for the rest using the mole ratios. Then i used the keq constant equation of concentration of products over...
*April 8, 2010 by andy*

**Physics**

A crate with a mass of 110 kg glides through a space station with a speed of 2 m/s. An astronaut speeds it up by pushing on it from behind with a force of 240 N, continually pushing with this force through a distance of 4 m. The astronaut moves around to the front of the crate...
*November 18, 2012 by Emily Tran*

**physics**

A crate with a mass of 110 kg glides through a space station with a speed of 2 m/s. An astronaut speeds it up by pushing on it from behind with a force of 240 N, continually pushing with this force through a distance of 4 m. The astronaut moves around to the front of the crate...
*November 18, 2012 by Emily Tran*

**Math**

Gymnast Clothing manufactures expensive soccer cleats for sale to college bookstores in runs of up to 500. Its cost (in dollars) for a run of x pairs of cleats is C(x) = 3000 + 9x + 0.1x2 (0 ≤ x ≤ 500). Gymnast Clothing sells the cleats at $130 per pair. Find the ...
*February 19, 2012 by Mandie*

**Algebra**

Gymnast Clothing manufactures expensive soccer cleats for sale to college bookstores in runs of up to 500. Its cost (in dollars) for a run of x pairs of cleats is C(x) = 3000 + 9x + 0.1x2 (0 ≤ x ≤ 500). Gymnast Clothing sells the cleats at $130 per pair. Find the ...
*February 19, 2012 by Nick*

**Physics**

Hi I see another student actually posted this question... but got no answer... is someone able to look at it? see below - a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a mass of m, a speed v before the collision with the...
*November 2, 2014 by LoveBug*

**math**

Mighty Mouse (who flies at a constant speed of 600mph) was standing by a cannon that was pointed straight up. A cannonball was shot vertically into the air with an initial velocity of 300 mph. Exactly one second after the cannon was fired, Mighty Mouse flew up to touch the ...
*April 24, 2013 by bern*

**physics**

A particle has a kinetic energy equal to its rest energy. (a) What is the speed of this particle? (b) If the kinetic energy of this particle is doubled, does its speed increase by more than, less than, or exactly a factor of 2? (c) Explain (d) Calculate the speed of a particle...
*April 28, 2012 by martini*

**psychology 11**

Dan and maureen are married and have 2 children, ages 7 and 12. Dan coaches Litle League, and Maureen drives the kids to soccer practice. Dan works as a middle manager in a high-tech firm, and maureen is a successful architect. They own their own house, 2 cars, and a boat. By ...
*September 10, 2009 by Kerri*

**Physics**

A thin massless horizontal pipe rotates about a vertical axis with angular speed ω as shown in the figure. A small bug, located at a distance r from the axis, starts crawling inside the pipe at constant speed v (relative to the pipe). Because of the bug, the motor must ...
*June 18, 2013 by Jon*

**science**

1. How much potential energy does a 5kg block have if it is 2m above the ground? 2. What is the mass of an object that has 40J of potential energy and is 10m above the ground? 3. What is the weight of an 8kg object? 4. How much work does it take to lift an 8kg object 2m? 5. ...
*October 22, 2011 by Dave*

**P. Chemistry **

A student added solid K2O to a 750.0 mL volumetric flask. The solid was dissolved in water and then the flask filled with water to the mark. This formed 750.0 mL of the initial KOH solution. 20.0 mL of the initial solution was transferred to another flask and diluted to 200.0 ...
*February 23, 2010 by Mark*

**physics**

The speed of a sound in a container of hydrogen at 201K is 1220m/s. What would be the speed of sound if the temperature were raised to 405K? Assume that hydrogen behaves like an ideal gas. Please guide me to do it. Thanks!
*March 3, 2008 by Bosco*

**physics entry **

A meteor headed straight towards the earth has an approach speed of 2.00e3 m/s at a distance of 7 earth radii from the center of the earth. What will be its speed when it reaches earth a 6.38e6 m(ignore the effects of atmosphere)?
*November 17, 2009 by Andy *

**College Physics**

A rock thrown horizontally at a large bell 54.0 m away is heard to hit the bell 4.80 s later. If the speed of sound is 330 m/s, what was the speed (in meters/second) of the rock? (Disregard gravity.)
*June 9, 2010 by Matt*

**physics**

A 2.38 × 103 kg car requires 5.4 kJ of work to move from rest to some final speed. During this time, the car moves 28.1 m. Neglecting friction, find a) the final speed. Answer in units of m/s.
*November 2, 2010 by Joe*

**Algebra**

A riverboat cruise line has a boat that can travel 76 mi downstream in the same time that it takes to travel 52 mi upstream. The speed of the current in the river is 1.5 mph. Find the speed of the boat in still water.
*March 7, 2011 by Paula*

**intermediate algebra**

Rowing. Abby rows 10km. upstream and 10km. back in a total time of three hours. The speed of the river is 5km./h. Find Abby's speed in still water.
*August 2, 2011 by ROCKY*

**algebra**

A motorboat can maintain a constant speed of 24 mph relative to the water. The boat makes a trip upstream to a certain point in 62 minutes. the return trip takes 34 minutes. What is the speed of the current?
*September 20, 2011 by Wen*

**CHEM AP please help!!**

Using Heisenberg's uncertainty principle, calculate the uncertainty in the position of the following. a 1.32-mg mosquito moving at a speed of 1.61 m/s if the speed is known to within ± 0.01 m/s i tried every way and still cant get it..please someone help
*October 23, 2011 by Karina*

**Physics**

A 60 kg boy on roller skates moves with a speed of 5 m/s. He runs into a 40 kg girl on skates. Assuming they cling together after the collision, what is their speed?How much kinetic energy was lost in the collision?
*February 21, 2012 by judy*

**Calculus and Vectors**

A bald eagle flying horizontally at 48km/h drops it's prey from a height of 50m. a)what is the prey's vertical velocity when it hits the ground? b)when is the vertical speed greater than the horizontal speed?
*February 27, 2012 by Sally*

**Physics**

A roller coaster reaches the top of the steepest hill with a speed of 3.0 km/h . It then descends the hill, which is at an average angle of 40 degrees and is 50.0 m long. Estimate its speed when it reaches the bottom. Assume kinetic friction (uk) = 0.18.
*March 16, 2012 by KRIS*

**Physics**

A roller coaster reaches the top of the steepest hill with a speed of 3.0 km/h . It then descends the hill, which is at an average angle of 40 degrees and is 50.0 m long. Estimate its speed when it reaches the bottom. Assume kinetic friction (uk) = 0.18.
*March 16, 2012 by KRIS*

**maths**

sita and gita start walking from the same point on the road but in opposite directions.if sita walks at the speed of 5km/h and gita @ a speed of 4km/h,in how much time will they be 27km apart
*December 20, 2012 by Anonymous*

**Physics**

Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .
*December 20, 2012 by Alex*

**Physics**

Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .
*December 20, 2012 by Alex*

**Physics**

solve physics question. a train moves 3.6km from rest to rest in 3minutes. the greatest speed is 90km/h, and the acceleration and retardation are uniform. find the distance travelled at full speed.
*June 17, 2013 by Anonymous*

**physics**

an automobile is travelling towards you at a speed 25.0m/s. When you measure the frequency of its horn, you obtain a value of 26Hz. If the actual frequency of the horn is known to be 240Hz, calculate speed of sound in air? answer is 325m/s
*July 17, 2013 by jason*

**Physics**

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?
*September 3, 2013 by Ben*

**Physics**

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?
*September 3, 2013 by Ben*

**physics**

A curving freeway exit has a radius of 50.5m m and a posted speed limit of 35 mi/h \rm mi/h. What is the radical acceleration (in m/s^2) if you take the exit as posted speed express answer to two significant figures and appropriate units. Thanks for any help.
*September 21, 2013 by deb*

**physics**

Consider a swimmer who wants to swim directly across a river as shown in the figure below. If the speed of the current is 0.29 m/s and the swimmer's speed relative to the water is 0.64 m/s, how long will it take her to cross a river that is 14 m wide?
*February 4, 2014 by sarah*

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