Tuesday

April 21, 2015

April 21, 2015

Number of results: 122,300

**math**

what are the level of speed, speed of sound, speed of light, what are the next levels of speed.
*October 22, 2014 by Lalji*

**math**

Application Giovanni is flying his Cessna airplane on a heading as shown. His instrument panel shows an air speed of 130 mi/h. (Air speed is the speed in still air without wind.) However, there is a 20 mi/h crosswind. What is the resulting speed of the plane?
*March 8, 2013 by x*

**math**

Application Giovanni is flying his Cessna airplane on a heading as shown. His instrument panel shows an air speed of 130 mi/h. (Air speed is the speed in still air without wind.) However, there is a 20 mi/h crosswind. What is the resulting speed of the plane?
*March 9, 2013 by y*

**math**

A motorist travelling at a steady speed of 120km/h covers a section of the highway in 30min. After a speed limit is imposed he finds that when travelling at the maximum speed allowed he takes 20 min. longer than before to cover the same section. Calculate the speed limit.
*November 30, 2012 by Lindsay*

**math**

jenny had driven for 2h at a constant speed when road forced to reduce her speed by 10 mp/h for the remaining 1h of 152 mile trip. find her original speed 152 - 10 = 142/2 = 71 mp/h Can 71 mi/hr be right for the first speed? 71 mi/hr x 2 hrs = 142 miles traveled. 10 mi/hr x 1 ...
*November 28, 2006 by koleo*

**math**

A boat travels 8km upstream and back in 2 hours. If the current flows at a constant speed of 3km/h, Find the speed of the boat in still water.(when the boat goes upstream, it speed reduces by 3km/h, and when going downstream, its speed increases by 3 km/h)
*January 15, 2013 by zshen*

**Math**

A rubber ball is thrown straight down from a height of 244 feet at speed of 80 feet per second. If the ball always rebounds with one-fourth of its impact speed, what will be the speed of the ball the third time it hits the ground? My Answer is: 1/4*80=60 1/4*60=45 1/4*45=33.75...
*May 6, 2013 by Zach*

**math**

The train slows down uniformly from a speed of 50m/s to a speed of 10m/s in a time of 20sec,During the next 30sec,it accelerates uniformly to a speed of u metres/sec.calculate the retardation from t=0 to t=20?
*May 3, 2013 by Meggy lep*

**Math**

The Danville Epress travels 280mi at a certain speed.If the speed had been increased by 5mph the trip could have been made in 1 hour less time.Find the actual speed.
*February 15, 2011 by Nicole*

**math**

The Danville Epress travels 280mi at a certain speed.If the speed had been increased by 5mph the trip could have been made in 1 hour less time.Find the actual speed.
*February 15, 2011 by Nicole*

**MATH Algebra**

The speed of a passenger train is 6 mph faster than the speed of a freight train. The passenger train travels 280 miles in the same time it takes the freight train to travel 250 miles. Find the speed of each train. What is the speed of passenger train? ____mph What is the ...
*August 7, 2009 by Anonymous*

**10th grade Academic Math**

hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.
*June 7, 2010 by Neil*

**10th grade Academic Math**

hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.
*June 7, 2010 by Neil*

**10th grade Academic Math**

hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.
*June 7, 2010 by Neil*

**science/math**

A car travels up a hill at a constant speed of 45 km/h and returns down the hill at a constant speed of 70 km/h. Calculate the average speed for the round trip.
*September 24, 2011 by Jonathan*

**math**

A cyclist bikes at a constant speed for 18 miles. He then returns home at the same speed but takes a different route. His return trip takes one hour longer and is 23 miles. Find his speed.
*July 23, 2012 by john*

**Math**

An aircraft flew 3hrs with the wind. The return trip took 4hrs against the wind. If the speed of the plane in still air is 180mph more than the speed of the wind, find the wind speed and the speed of the plane in still air.
*September 27, 2011 by Ingrid*

**MATH**

THE AVERAGE WIND SPEED INCREASED 19 MILES/H FROM 8 AM TO 12 NOON. THE AVERAGE WIND SPEED DECREASED 5 MI MI/H FROM 12 NOON TO 4 PM. AT 4 PM, THE AVERAGE WIND SPEED WAS AT LEAST 32 MI/H. WHAT IS THE MINIMUM VALUE OF THE AVERAGE WIND SPEED AT 8 AM? NEED TO SOLVE AN INEQUALITY ...
*November 30, 2011 by Justin*

**Math**

A small truck is to be driven 300 miles on a freeway at a constant speed of x miles per hour. Speed laws on the freeway require that a truck must be driven between 30 miles per hour and 70 miles per hour. assume that fuel cost $3.50 per gallon. in addition, assume that for a ...
*April 24, 2007 by nancy*

**english**

In the following paragraph, are the words I have in capital letters adverbs? A five-speed bike combines the WORST of a three-speed and ten-speed. The typical five-speed is built on the same heavy frame as the three-speed, OFTEN, has the five-speed gear cluster and changer ...
*September 17, 2008 by Tracy*

**MAth grade 8**

mr kumar lives in the eastern part of spore . he visits his aged parents , who lives 36 km away , every weekend he finds that is he increases the average speed of his vehicle by 12km/h, he could save 9 minutes of his travelling time. find the speed at which he travels before ...
*November 10, 2011 by Aldwin*

**Math**

A sample of 500 drivers was asked whether or not they speed while driving. The following tables gives a two-way classification: Speed Never speed Male 222 78 Female 128 72 We wish to test whether gender and speeding are related at the 1% significance level.
*December 14, 2013 by Melina*

**Math**

A sample of 500 drivers was asked whether or not they speed while driving. The following tables gives a two-way classification: Speed Never speed Male 222 78 Female 128 72 We wish to test whether gender and speeding are related at the 1% significance level.
*December 14, 2013 by Melina*

**Math**

Mattie drove 140 miles in the same amount of time that it took a tubropropeller plane to travel 520 miles. The speed of the plane was 190 mph faster than the speed of the car. Find the speed of the plane
*March 1, 2012 by Anonymous*

**math**

a car travels at a constants speed and uses G(x) litres of gas per kilomotre, where x is the speed of the car in kilomotres oer hour and G(x)=(1280+x^2)/(320x) a>if fuel costs 1.29 per litre, determine the cost function C(x)that expresses the cost of the fuel for a 200KM ...
*October 31, 2011 by invy*

**Math**

a car travelled 60 km in 25 mins. its speed is equilent to _____km/hour. In 2 1/3 hours this car travelled______km if it maintained at this speed. when you change mins to hour to you divide 60 into 25 to get the km/hour??? im confused. 60km/25 min. = 12km/5min 5 min. is 1/12 ...
*April 13, 2007 by Anonymous*

**math**

Jimmy is travelinig at a speed of 135 mi/hr. what is his speed in feet per second?
*January 14, 2008 by Anonymous*

**math**

Benny is traveling at a speed of 15 mi/h. What is his speed in feet per second?
*February 16, 2008 by justin black*

**Math**

Jimmy is traveling at a speed of 60 mi/h. What is his speed in feet per second?
*August 15, 2009 by Regina*

**Math**

The speed limit on a highway is 65 mi/hr. What is this speed in km/hr? Is the correct answer 104 km/hr?
*February 25, 2012 by Mandi*

**college math**

the speed limit on a local highway is 65 miles per hour. what is this speed in km/hr
*June 19, 2012 by Lourane*

**Math**

A wheel has a 32 inch diameter. The speed of a point on its rim is 44 ft/sec. What is its angular speed?
*February 26, 2013 by Sarah*

**math**

A rikhshaw covered 2 km/hr and return back at a speed of 11 km/hr find the average speed of the rickshaw
*May 4, 2014 by jatin*

**math 117**

A passenger train can travel 325 mi in the same time a freight train takes to travel 200 mi. If the speed of the passenger train is 25 mi/h faster than the speed of the freight train, find the speed of each. Speed = distance/time Therefore time = distance/speed. Assume the ...
*July 11, 2007 by Diana*

**physics**

An airplane travels 2800 km at a speed of 700 km/h, decreases its speed to 500 km/h for the next 1500 km and travels the last 1000 km at a speed of 400 km/hr. Find the average speed of the plane for the trip.
*September 13, 2011 by nikita*

**math (speed)**

A boat cruises downstream for 2 hours before heading back. It takes 3.5 hours going upstream to get back. If the speed of the stream is 8 mph, what is the speed of the boat in still water?:
*September 22, 2007 by --*

**math**

a bus takes 12 hours to travel the same distance that an airplane travels in 1.5 hours. the average speed of the airplane ia 120 km per hour faster than five times the average speed of the bus. what is the average speed of the bus? let x represent the speed of the bus speed of...
*November 29, 2006 by aaron*

**repost math question **

An aircraft flew 6 hours with the wind. The return trip took 7 hours against the wind. If the speed of the plane in still air is 276 miles per hour more than the speed of the wind, find the wind speed and the speed of the plane in still air. The wind soeed was ______ mph.
*October 22, 2010 by Anonymous*

**math**

by how many order of magnitute is the speed of light greater than the average speed of grey sound? Rose Diamond when he set the hight gate track 710 m record of for this 47.43 sec in April 2003 710m/47.43s = close to 15 m/s. The speed of light is 3 x 10^8 m/s or 30 x 10^7 m/s...
*October 16, 2006 by math*

**math**

a train travels 68 km at an average speed of 51 km/h. it then travels another 20 km at an average speed of 40 km/h before reaching its destination. calculate the average speed of whole journey?
*April 26, 2014 by owais*

**Math vocab**

What does distance/time/rate of speed mean?? Its all one word AND IM SOO CONFUSED! Movement? I am confused also. Rate of speed is not a common term. Speed is rate of motion , or rate of change of distance per time. i need help on my math vocab what is a sector What is the ...
*October 4, 2006 by Alexis*

**physics**

A runner, beginning at rest, completed a 50 m run with a final speed of 6 m/s. Assuming constant acceleration. a) What was the average speed of the runner? b) What was the runner's time? c) What was the acceleration? a) half the final speed b) distance/(average speed) c) (...
*October 2, 2006 by maria*

**Math, Please Help!!!**

a hot air balloon is rising vertically 10 ft/sec while the wind is blowing horizontally 5ft/sec. Find the speed of the balloon and the angle x that it makes with the horizontal. I know that the speed of the balloon is the square root of (10)^2 + (5)^2, but I was wondering if ...
*November 10, 2011 by Jenny Star*

**Math, Please Help!!!**

a hot air balloon is rising vertically 10 ft/sec while the wind is blowing horizontally 5ft/sec. Find the speed of the balloon and the angle x that it makes with the horizontal. I know that the speed of the balloon is the square root of (10)^2 + (5)^2, but I was wondering if ...
*November 10, 2011 by BOB*

**sCiEnCe**

Can you define speed, motion, constant speed and average speed? And can you get me there formulas? Ex-Distance over speed THANKS MUCH! <333 Can you define speed, motion, constant speed and average speed? And can you get me there formulas? Ex-Distance over speed THANKS MUCH...
*March 4, 2007 by Jonas!*

**math**

The speed of a boat in still water is 8 km/h. It travels 60 km upstream and 60 km downstream in a total time of 16 hours. What is the speed of the stream?
*March 23, 2010 by Tonto*

**Math**

An alien rocketship is travleing at a speed of 0.024 miles per minute. At this speed, how many inches will it travel in 1 second
*January 26, 2012 by Cassidy*

**physics**

A object of mass 3.00 kg is subject to a force Fx that varies with position as in the figure below. Find the work done by the force on the object as it moves as follows: (a) from x = 0 to x = 4.00 m 1 Your response differs from the correct answer by 10% to 100%. J (b) from x...
*October 20, 2009 by fdtc*

**math**

the question is: jim ran a mile in 3 min and 43 seconds how fast was his avrage speed. what was his avg. speed if the time was 353
*April 24, 2009 by bandit55751*

**Math**

Maira drives at a constant speed for 3 hours and travels 175 miles. how far would she drive in 4.5 at the same speed?
*September 22, 2014 by Eren Jeager*

**algebra**

the speed of train A is 8 mph slower than the speed of train B. Train A travels 220 miles in the same time it takes train B to travel 260 miles. Find the speed of both trains. Speed of train A = Speed of train B =
*November 12, 2012 by pam*

**math**

The speed of a train A is 8mph slower than the speed of train B. Train A travels 230 miles in same time it takes train B to travel 270 miles. Find the speed of each train.
*April 21, 2010 by Karen*

**math**

the speed of a train a is 6 mph slower than the speed of train b. train a travels 220 miles in the same time it takes train b to travel 250 miles. find the speed of each train
*August 19, 2010 by summer*

**math**

a boat travels 4 km upstream and 4 km back. the time for the round trip is 9 hrs. the speed of the stream is 2 km/hr. What is the speed of the boaty in still water?
*April 3, 2011 by Anonymous*

**Math**

Suppose the speedometer of your car reads 90 km/ hr. If you are driving in the united states where the maximum speed is posted as 50 mi/ hr By how much are you exceeding the speed limit.
*April 14, 2015 by Jen*

**Physics**

A ball is thrown horizontally from a height of 16.01 m and hits the ground with a speed that is 5.0 times its initial speed. What was the initial speed? Ok so I got a vertical final velocity of 17.714 m/s. Now I need to find the horizontal speed, correct? Which equation can I ...
*November 4, 2007 by Lindsay*

**Radians**

The angular speed of a large pulley wheel that has a radius of 15, is 50 revolutions/min. Find the angular speed and the rim speed of the smaller wheel that has a radius of 5. The rim speed is going to be the same. I got the angular speed but I can't figure out why the rim ...
*April 5, 2011 by Jessica*

**Physics**

When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height v=0 isn't the answer a)?
*September 25, 2007 by Tammy*

**Physics**

When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height v=0 isn't the answer a)?
*September 26, 2007 by Tammy*

**Math**

Suppose the speedometer of your car reads 90km/hr. If you are driving in the United States where the maximum speed is posted as 50 mi/hr by how much are you exceeding the speed limit.
*April 13, 2015 by Sharon*

**UPSTREAM**

THIS EXURSION WITH A BOAT TRAVEL 35KM UPSTREAM AND THEN BACK AGAIN IN 4 H 48 MINUTRE. iF THE SPEED OF THE BOAT I5 K,/H, WHAT IS THE SPEED OF THE CURRENT? Let v be the speed of the current. The boat's speed upstream (relative to the land) is 15-v and the speed downstream is 15+...
*December 21, 2006 by CINDY*

**math**

A boat needs to travel south at a speed of 20 km/h. However a constant current of 6 km/h is flowing from the south-east. Use vectors to find: a.the equivalent speed in still water for the boat to achieve the actual speed of 20 km/h. b the direction in which the boat must head ...
*March 28, 2014 by Anonymous*

**Math**

Gavin's anemometer measures the wind speed at 44.14 kilometers per hour. 4 times faster than the wind speed 5 hours ago. What was the wind speed 5 hours ago?
*February 10, 2014 by Anonymous*

**Math**

An alien rocketship is traveling at a speed of 2,500,000 feet per minute. At this speed, how many miles will it travel in 1 second? Round to the nearest thousandth.
*February 20, 2012 by Harry*

**math**

Driver A had been leading archrival B for a while by a steady 3 miles. Only 2 miles from the finish, driver A ran out of gas and decelerated thereafter at a propertional to the square of his remaining speed. One mile later, driver A's speed was exactly halved.If driver B's ...
*February 26, 2013 by angah*

**College math**

Highway curves If a circular curve without any banking has a radius of R feet, the speed limitL.in miles per hour for the curve is L=1.5 R. (a.)Find the speed limit for a curve having a radius of 400 feet. (b.) If the radius of a curve doubles, what happens to the speed limit...
*April 28, 2011 by Shin*

**Math - Advanced Functions**

the function f(x)=-0.005x^2+0.8x+12 models the relationship between a certain vehicle's speed and a fuel economy, where f(x) is the fuel economy in kilometres per litre and x is the speed of the vehicle in kilometres per hour. Determine the rate of change in fuel economy for ...
*September 30, 2013 by Sydney*

**Math**

Over a fixed distance speed r varies inversely as time t. If the speed of a car is 30 mph when the time is 6 seconds what would the speed be of the car if the time was 4 seconds
*July 11, 2013 by Scott*

**math**

ANGULAR SPEED OF A RACE CAR. A race car is driven around a circular track at a constant speed of 180miles per hour. If the diameter of the track is 1/2mile, what is the angular speed of the car? Express your answer in revolutions per hour(which is equivalent to laps per hour) ...
*June 13, 2007 by michelle*

**math**

Two objects have the same kinetic energy. One has a speed that is 3.0 times greater than the speed of the other. What is the ratio of their masses? (Let m1 be the slower object and m2 be the faster.) m1/m2=
*March 18, 2009 by cbrown*

**math**

A car travels at an average speed of 36 kilometers per hour. Write and solve an equation to predict how many hours if will take travel 432kph. It if continues of this speed.
*June 21, 2011 by jewel padilla*

**Math**

Victoria has a boat that can move at a speed of 20km/h in still water. She rides 140km downstream in the same time it takes 35km upstream. What is the speed of the river?
*May 17, 2012 by Courtney*

**Calculus**

The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400). a) Determine the legal speed speed that will maximize the fuel efficiency if the speed limit is 50 km/h. The answer is 50 km/h but my teacher said it can't be that. Any...
*March 4, 2012 by Jake*

**Physics**

In laboratory situations, a projectile’s range can be used to determine its speed. To see how this is done, suppose a ball rolls off a horizontal table and lands 1.2m out from the edge of the table. If the tabletop is 95cm above the floor, I figured out the ball is in the air ...
*October 5, 2014 by Anonymous*

**Math**

The time t required to drive afixed distance varies inversely as the speed r. It takes 5 hr at a speed of 80 km/h to drive a fixed distance. How long will it take t odrive the same distance at a speed of 70 km/hr? Please help! In an inverse dependence situation, the product of...
*October 25, 2006 by Dee Williams*

**physics**

An object moving with constant acceleration at time t=0 its speed is v. , at t=t. its speed is v./2 , at t=2t. its speed is v./4 . What will be its speed at time t=3t.?
*July 26, 2011 by Tillu*

**Science**

Here are some muliple choice questions I am stuck on. Thanks in advance for help any one can give me. 1) A falling object that has reached its terminal speed continues to gain? a.speed b.both speed and acceleration c.acceleration d.neither speed nor acceleration. I think the ...
*March 8, 2007 by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*June 20, 2013 by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*June 20, 2013 by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*June 20, 2013 by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*June 20, 2013 by Anonymous*

**Math-Algebra**

A car takes 3 hours to travel a distance of 240 km with a speed of 80 km/h while a motorbike can cover the same distance in 4 hours if its travels at a speed of 60 km/h. Explain why the speed and the time it takes for the vehicles to travel a certain distance exhibit an ...
*November 13, 2013 by McKenna Louise*

**Math**

The speed of sound in air at sea level at 32 degrees Fahrenheit is 1088 ft/s. If that represents only 22.04% of the speed of sound in ice-cold water, what is the speed of sound in ice-cold water, to the nearest whole number? what i did: 22.04/100 = 32/x i set up this ...
*January 16, 2015 by Katy*

**Math grade 12 **

the function f(x)= -o.005t^2+0.8t+12 models the relationship between a certain vehicle’s speed and fuel economy, where is the fuel economy in kilometres per litre and x is the speed of the vehicle in kilometres per hour. Determine the rate of change in fuel economy for 10 km/h...
*July 22, 2011 by Anonymous*

**physics**

if a plane is flying at a speed so that the apex half-angle of its shock wave is 30 degrees, what is the speed if the speed of sound is 320 m/s?
*May 13, 2011 by Cam*

**physics**

a girl of mass 40 kg is skating at a constant speed of 1 m/s. supposed she doubles her speed, how much work will be needed to double her speed?
*January 7, 2013 by merlyn*

**physics**

A car moving with an initial speed v collides with a second stationary car that is 50.7 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 33.2 percent of the original speed. Calculate the final speed of the second ...
*March 26, 2014 by Erin*

**physics**

The acceleration due to gravity near a planet's surface is known to be 3.20 . Part A If the escape speed from the planet is 9.54 , determine its radius. Part B Find the mass of the planet. Part C If a probe is launched from its surface with a speed twice the escape speed and ...
*September 29, 2012 by sammy*

**Physics**

If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is three-fifths the escape speed? I keep getting the answer 2.56x10^6 m after solving it a few different ways. Help would be great.
*April 28, 2012 by Kristin*

**Physics**

A cart has a constant acceleration of a = 2m/s2. At a certain instant its speed is 5 m/s. What is its speed 2 s later and 2 s earlier?. What is its average speed during the time interval of 4s.?
*October 3, 2010 by Jay*

**math/ physics**

An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed? If this speed were increased by just 5.0%, how much longer would the jump be?
*September 22, 2010 by sara*

**math**

Q) (Speed) Ahmed drives from Abu Dhabi to Dubai. The journey takes him 1 hour 30min and the distance covered is 130km. What is the average speed at which he was travelling (rounded to the nearest 1km/hr)?
*November 12, 2012 by john*

**Math**

8. Sylvia is training for a triathlon. she cycles 6.25 km in 25 min. a) What is her average speed, in kilometres per hour? b) Solve a proportion to determine how long she would take to cycle 40 km. Us the speed in part A)
*May 6, 2014 by Annadona*

**SCIENCE**

A police man is driving a car with a speed of 30km/h,and firing a bullet having a speed of 150m/s towards another car which is moving ahead with a speed of 192km/f.At what speed will the bullet hit the car?
*July 16, 2012 by SWAPAN*

**math**

A speed boat is travelling from Florida to Cuba (distance of approximately 380 km), it is directly affected by the water current. Thus, the actual speed of the boat with respect to the ground is the speed of the boat (125 km/h) plus the water current speed, c. a) Develop an ...
*February 25, 2013 by mehwish*

**math**

Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car B, starting at rest from the same point that ...
*September 28, 2014 by Wes*

**College math**

Highwq curves. If a circular curve without any banking has a radius of R feet, the speed limit L in miles per hour is L = 1.5 aqrt(R) (a) Find the speed limit for a curve having a radius of 400 feet. (b). If the radius of a curve doubles, what happens to the speed limit? (c.) ...
*April 30, 2011 by Shin*

**Physics**

1. How is average speed related to instantaneous speed? What certain conditions must be met for the two variables to have the same or close value? 2. Cite one practical example on the use of the concepts of instantaneous speed, average speed in observing safety on the road.
*July 2, 2014 by Jade*

**physics**

A pick up truck travelling at constant speed begins to accelerate at 1.5m/s squared for 6 seconds, by which times it has reached a speed of 20m/s. What was its original speed?
*February 25, 2013 by Poppy Proasheck*

**physics**

If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it when its speed is 1/9 of the escape speed?
*April 28, 2012 by Turk*