Friday

July 31, 2015

July 31, 2015

Number of results: 22,160

**physics **

Starting from rest, a boat increases its speed to 4.92 m/s with constant acceleration. (a) What is the boat's average speed? (b) If it takes the boat 5.07 s to reach this speed, how far has it traveled?
*August 29, 2012 by stoic-rider77*

**physics**

A 56.0-kg skater is traveling due east at a speed of 2.80 m/s. A 77.0-kg skater is moving due south at a speed of 4.40 m/s. They collide and hold on to each other after the collision, managing to move off at an angle south of east, with a speed of vf. Find (a) the angle and (b...
*October 16, 2008 by chris*

**Maths**

The braking distance of a car is directly proportional to te square of it's speed. When the speed is p metres per second, the braking distance is 6m. When the speed is increased by 300%, find (a) an expression for speed of the car (b) the braking distance (c) the % increase in...
*October 21, 2011 by StuartKess*

**physics**

A 59.0-kg skater is traveling due east at a speed of 1.80 m/s. A 61.0-kg skater is moving due south at a speed of 6.20 m/s. They collide and hold on to each other after the collision, managing to move off at an angle south of east, with a speed of vf. Find (a) the angle and (b...
*October 22, 2012 by sammy*

**Physics circular motion **

A speed skater goes into a turn with a 31 meter radius. The skater has a speed of 14 m/s and experiences a centripetal force of 460 n. What is the mass of the speed skater
*December 5, 2014 by Alejandro *

**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**

When a small object is launched from the surface of a fictitious planet with a speed of 52.0 m/s, its final speed when it is very far away from the planet is 32.0 m/s. Use this information to determine the escape speed of the planet.
*April 1, 2014 by Ying*

**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*

**Intermediate algebra**

Hello, I am kind stuck on this question In the lab you discover a relationship between the temperature of the air and the speed of sound. You find the speed of sound is never lower than 331 m/s and increases by 60% of the current temperature. a. What is the equation from this ...
*November 28, 2011 by Jennifer*

**physics**

a wheelof diameter 0.70 meterolls without slipping. a point at the top of the wheel moves with a tangential speed of 2.0 meter/second. a) at what speed is the axis of the wheel moving? b) What is the angular speed of the wheel?
*March 24, 2014 by Anonymous*

**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)If the speed limit is 50 km/h, determine the legal speed that will maximize the fuel efficiency. Could someone explain to me why the legal speed is 50 km/h to maximize...
*March 5, 2012 by Jessica*

**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*

**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*

**physics**

if a stone at the end of a string is whirled in a circle, the inward pull on the stone A) is known as the centrifugal force B) is inversely proportional to the speed of the object C) is inversely proportional to the square of the speed D) is proportional to the speed E) is ...
*May 28, 2012 by star*

**physics - SHM**

Calculate the speed of the pulse from the following: y(x,t) = 2/((x - 3t)^2 + 1) Well the speed of the pulse is given by: y(x,t) = f (x - vt) for a pulse traveling to the right and y(x,t) = f (x + vt) for a pulse traveling to the left but in this case the function is (x - 3t)^...
*April 14, 2007 by COFFEE*

**Physics**

An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 5.00 m/s from a height of 1.50 m above the ground. (a) Will the rock reach the top of the wall? (b) If so, what is its speed at the top? If not, what initial speed must it have to reach ...
*September 15, 2014 by Lorine*

**Physics**

An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 5.00 m/s from a height of 1.50 m above the ground. (a) Will the rock reach the top of the wall? (b) If so, what is its speed at the top? If not, what initial speed must it have to reach ...
*September 15, 2014 by Lorine*

**Physics**

Starting from rest, a 6.70 kg object falls through some liquid and experiences a resistive (drag) force that is linearly proportional to the velocity of the object. It's measured that the object reaches half its terminal speed at 4.50 s. a) What is the terminal speed for this ...
*July 26, 2012 by Zac*

**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? I came up with a take off speed of 27.4 but the system is saying that is ...
*September 22, 2010 by jason*

**physics**

A girl riding a bicycle with a speed of 5m/s towards northdirection , observes rain falling vertically down. If she increases her speed to 10m/s , rain appears to meet her at 45degree tp the vertical .what is the speed of rain ?
*August 28, 2012 by manish dagar*

**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*

**College Physics**

a horizontal speed of 15.8 m/s and a vertical speed 10.0 m/s upward. What is the vertical speed 1.12 s later?
*September 26, 2010 by J*

**PHYSICS 3**

A solid disk (mass = 1 kg, R=0.5 m) is rolling across a table with a translational speed of 9 m/s. a.) What must the angular speed of the disk be? rad/s d.) The disk then rolls up a hill of height 2 m, where the ground again levels out. Find the translational and rotational ...
*October 20, 2008 by kelsey*

**physicsss**

A Thompson’s gazelle can reach a speed of 13 m/s in 3.0 s. A lion can reach a speed of 9.5 m/s in 1.0 s. A trout can reach a speed of 2.8 m/s in 0.12 s. Which animal has the greatest acceleration?
*October 28, 2010 by Jay*

**physics**

A .50kg ball is rolling on a frictionless surface at a speed of .75m/s. it collides with a second ball with a mass of 1kg which is also moving in the same direction as the first ball with a speed of .38m/s. After the collision the firt ball continues at a reduced speed of .35m...
*March 26, 2011 by Mari*

**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 in distress**

A salesman drove 480 miles from Pittsburgh to Hartford. The next day he returned the same distance to Pittsburgh in half an hour less time than his original trip took, because he increased his average speed by 4 mph find his original speed. Okay... I did it this way...480/2= ...
*July 1, 2015 by toya5 *

**physics**

the earthis moving around the sun in a circular orbit of radius 1.5*10^11. it makes one revolution per year.find the angular speed of earth in radian/sec, and the tangential speed of earth using the formula v=r.w , and tangetial speed ?
*April 25, 2010 by mo*

**physics**

a patrol of timing paths each vehicle needs to travel the first half of the distance at a speed of 140 km / h. if the speed limit is 80km / h. which should be the highest average speed of the car in the second half of the section, to avoid being fined?
*October 10, 2010 by liz*

**Physics**

a steel ball drops onto a thick steel plate. its speed just before it hits is 10 m/s and it rebounds with a speed of 9 m/s. what percentage of its kinetic energy did it lose during the collision? what would you expect its speed to be after the second rebound?
*September 6, 2012 by Megan*

**Physics**

A GPS satellite orbits at an altitude of 2.0 x 10^7 m and a speed of 3.9 x 10^3 m/s, Earth’s radius is 6.4 x 10^6 m, and a point at its equator has tangential speed of 460 m/s, By approximately what fraction must the time be adjusted to account for both regular/speed-dependent...
*January 21, 2013 by Katie*

**Science**

What is the distance an object travels per unit of time? It's called the speed Depends on the velocity (speed), if the speed is 10mph, then the object would travel 10 miles (distance) per hour (unit of time). I'm unsure what your answer is saying, because velocity and speed ...
*September 18, 2006 by Ginger*

**Algebra**

During the first part of a trip, a canoeist travels 57 miles at a certain speed. The canoeist travels 13 miles on the second trip at a speed 5 mph slower. The total time for the trip is 5 hrs. what was the speed on each part of the trip? The speed on the first part is? The ...
*April 22, 2012 by Stella*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20x10^4 rad/s to an angular speed of 3.14x10^4 rad/s. In the process, the bit turns through 1.92x10^4 rad. Assuming a constant angular acceleration, how long would it take the bit to reach ...
*October 23, 2012 by Sam*

**Physics**

A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. If a point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed, how many revolutions does the...
*June 24, 2012 by Bloom*

**Physics**

Car A and B are passing each other in different lanes. Car A has an initial speed of 15m/s and is gaining speed at 1.5m/s^2. Car B has an initial speed of 20m/s and is gaining speed at 2.0m/s^2. Find when and where the cars will pass one another and their speeds as they are ...
*February 20, 2008 by Anonymous*

**algebra**

With a tailwind, a bird flew at a ground speed of 3 mi/hr. Flying the same path against the same wind, the bird travels at a ground speed of 1.5 mi/hr. What is the bird's air speed? What is the wind speed?
*February 5, 2012 by tean*

**Algrebra**

with a tailwind, a bird flew at a ground speed of 3 mi/h. Flying the same path against the same wind, the bird travels at a ground speed of 1.5 mi/h. What is the bird's air speed? What is the wind speed?
*January 21, 2014 by Nathan*

**Physics**

A car is driven from point A to B at a constant speed of 25.0 m/s along a straight line, and then back from point B to A at a constant speed of 20.0 m/s. The values of the average speed over the entire trip is?
*January 19, 2010 by Mandy*

**physics**

If a car completes a 3.8 mi oval track in 69.7 s, what is the average speed? answer in mph Did the car accelerate? (A.yes the direction of the motion changed or B. yes the speed changed or C. no the speed didnt change)
*June 14, 2011 by alexa*

**Physics**

An airplane takes off at 9:00 A.M. and flies at 300. km/h until 1:00 P.M. At 1:00 P.M. its speed is increased to 400. km/h, and it maintains this speed until it lands at 3:30 P.M. What is the airplane’s average speed for the entire flight?
*June 16, 2014 by Piper*

**trigonometry**

A Wheel of radius 14in. is rotating 0.5 rad/sec. What is the linear speed v, the angular speed in RPM ( rev per min), and the angular speed in deg/sec?
*April 8, 2015 by Dan*

**physics**

If a runner travels at a speed of 10 m/s for 5 seconds, stops for a short time then continues on at a speed of 8 m/s for 4 seconds. How long was the runner stopped for if his average speed at the end of the trip is 4 m/s.
*February 22, 2011 by mikey*

**waves and optics**

Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
*May 27, 2012 by jennifer*

**college physics**

A car is driven from point A to B at a constant speed of 25.0 m/s along a straight line, and then back from point B to A at a constant speed of 20.0 m/s. The values of the average speed over the entire trip is?
*January 19, 2010 by Mandy*

**Physics**

Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest?(b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s?
*March 10, 2010 by Kelsey*

**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 that will maximize the fuel efficiency using speed limit of 50 km/h
*February 24, 2012 by Jake*

**physics**

Tarzan swings on a 34.0-m-long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? m/s (b) What is his speed at the bottom of the swing if he pushes off with a speed of 5.00 m/s? m/s
*October 10, 2012 by monic*

**physics**

A supersonic jet flying at 137 m/s is accelerated uniformly at the rate of 23.1 m/s2 for 20.0 s. (a) What is its final velocity? (b) The speed of sound in air is 331 m/s. How many times the speed of sound is the plane's final speed?
*October 23, 2012 by miranda*

**Physics **

Which of the following statements correctly describes the changes that occur in a sound wave, as it passes from cool air into warmer air? A) speed,wavelength and frequency all increase B) speed, wavelength increase; frequency decreases C) speed, wavelength increase; frequency ...
*November 28, 2014 by Kiki*

**physics**

a boy walks to a school at a rate of 6km with a speed of 2.5km/h and walks back with a constant speed of 5km/h. his average speed for round trip in km/h is ?
*June 25, 2011 by aleeza*

**physics**

The speed of an automobile increases from 11 m/s to a speed of 47 m/s over a time period of 9.0 seconds. What is the average rate at which the speed of this car is changing during this time period?
*September 2, 2011 by Anonymous*

**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*

**physics**

If a race car completes a 3 mi oval track in 50 s, what is its average speed? Did the car accelerate? 1. Yes, the speed changed. 2. No, the speed didn’t change. 3. Yes, the direction of the motion changed.
*September 25, 2011 by anon*

**Physics **

A sound wave in a solid has a frequency of 15.0 kHz and a wavelength of 0.333 m. What would be the wave speed, and how much faster is this speed than the speed of sound in air?
*March 4, 2014 by Melanie*

**Physics**

a train travels the first 30 km of 120 km track with a uniform speed of 30km/h.What should be the speed of train to cover the remaining distance of the track so that its average speed is 60km/h for the entire trip
*June 22, 2014 by Hitesh*

**physics**

A man in a boat moving at constant speed of 60km/h relative to the shore throws an object in the forward direction with a speed of 30km/h. What is the speed of the object as measured by an observer at rest at the shore?
*August 12, 2014 by samson*

**physics**

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

**Physics, science**

A billiard ball moving with a speed of +4 m/s runs head on into the back of another ball moving with a speed of +2 m/s. After the collision the first ball was measured to be moving with a speed of +2 m/s. Find the speed of the second ball. formula = mivi+m2v2= mivi+m2v2 so far...
*December 18, 2011 by Bassel*

**physics**

In 1954, Roger Bannister became the first human to run a mile in less than 4 minutes. Suppose that a runner on a straight track covers a distance of 1.00 mi in exactly 4.00 min. 1. What is his average speed in mi/h? 2. What is his average speed in ft/s? 3. What is his average ...
*January 20, 2011 by andrea*

**physics....**

Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
*June 21, 2012 by matin*

**Physics, please help me today.**

four pulleys are connected by two belts. Pulley A (radius 15cm) is the drive pulley and it rotates at 10 rad/s. Pulley B (radius 10 cm) is connected by belt 1 to pulley A. Pulley B' (radius 5cm) is concentric with pulley B and is rigidly attached to it. Pulley C (radius 25cm) ...
*November 17, 2006 by Dawn*

**physics**

A passenger on a stopped bus notices that rain is falling vertically just outside the window. When the bus moves with constant velocity, the passenger observes that the falling raindrops are now making an angle of 18 with respect to the vertical. What is the ratio of the speed...
*September 5, 2011 by cassie*

**Physics - Doppler Effect**

The siren in an ambulance has a frequency (according to you) of 1100 hz as it moves towards you at a speed v. It then makes a u-turn and travels away from you with a speed v, and you hear a frequency of 950 hz. What is the final speed v of the siren?
*March 28, 2011 by J Velji*

**physics**

A cyclist enters a curve of 30 m radius at a speed of 12 m s-1. He applies the brakes and decreases his speed at a constant rate of 0.5 m s-2. Calculate the cyclist’s centripetal (radial) [3 marks] and tangential [15 marks] accelerations when he is travelling at a speed of 10 ...
*February 28, 2012 by alex*

**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*

**Physics**

A car is speeding up and has an instantaneous speed of 14.2 m/s when a stopwatch reads 9.1 s. It has a constant acceleration of 1.8 m/s^2. (a) What change in speed occurs between t = 9.1 s and t = 12.6 s? (b) What is the speed when the stopwatch reads 12.6 s?
*September 23, 2009 by Megan*

**Physics**

A car travels up a hill at a constant speed of 33 km/h and returns down the hill at a constant speed of 60 km/h. Calculate the average speed (in km/h) for the round trip.
*January 16, 2011 by Ethan*

**physics**

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 22, 2011 by Jonoathan*

**physics**

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 22, 2011 by Jonoathan*

**physics**

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 22, 2011 by Jonoathan*

**Physics**

Car travels up hill at a constant speed of 50 km/h and returns down the hill at a constant speed of 65 km/h. Calculate the avg speed for the round trip in km/h.
*September 22, 2011 by JP*

**physics**

a bus travels from one point to another wuth a speed of 40km/h and returns with a speed of 60km/h.what is e average speed and average velocity of the bus?
*August 7, 2014 by Anonymous*

**Physics**

a bus travels from one point to another wuth a speed of 40km/h and returns with a speed of 60km/h.what is e average speed and average velocity of the bus?
*August 7, 2014 by Zubi*

**waves**

A skipper on a boat notices wave crests passing his anchor chain every 5 s. He estimates the distance between wavecrests to be 15 m. He also correctly estimates the speed of the waves. What is the speed? Speed = (wavelength) x (frequency) = (15 m)[1/(5 s)] = 3 m/s
*June 27, 2005 by Jarrad Michael*

**Calculus/Vectors**

An airplane heads due south with an air speed of 480km/h. Measurements made from the ground indicate that the plane's ground speed is 528km/h at 15 degrees east of south. Calculate the wind speed.
*May 2, 2011 by Anonymous*

**College algebra**

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
*June 22, 2012 by Anonymous*

**maths**

A man travels from town a to b at an average speed of 90km/h.on his return journey he takes (one)1 hour less and his speed is 10km/h faster......1.how far apart are towns a and b, ............. ..2.what Is his average speed from town a to b and back to a ..
*April 11, 2013 by mohammed*

**physics**

in 1954 roger bannister became the first human to run a mile in less than 4 minutes. suppose that a runner on a straight track covers a distance of 1.00 mi in exactly 4.00 min. What is the average speed in mi/h What is his average speed in ft/s what is his average speed in m/s...
*September 16, 2013 by deb*

**physics**

A 0.46 kg object connected to a light spring with a spring constant of 18.0 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. unit = cm/s (b) Determine the speed of the mass...
*March 22, 2011 by :)*

**College Physics - Speed**

Traveling at a speed of 15.6 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.730. What is the speed of the automobile after 1.25 s have elapsed? Ignore the effects of ...
*March 14, 2012 by Anonymous*

**trig**

A barge is pulled by two tugboats. The first tugboat is traveling at a speed of 12 knots with heading 140°, and the second tugboat is traveling at a speed of 17 knots with heading 200°. Find the resulting speed and direction of the barge. (Round your answers to the nearest ...
*July 21, 2013 by Priscilla*

**physics**

A car travels up a hill at a constant speed of 32 km/h and returns down the hill at a constant speed of 61 km/h. Calculate the average speed and the answer is not 46.5
*September 19, 2011 by Ann2793*

**Physics 141**

A 45.0-kg skater is traveling due east at a speed of 2.85 m/s. A 72.5-kg skater is moving due south at a speed of 7.35 m/s. They collide and hold on to each other after the collision, managing to move off at an angle θ south of east, with a speed of vf. Find the following...
*March 11, 2014 by dakota22*

**physical science **

Which of the following four bodies has the greatest kinetic energy? a. A body of mass 1 kg moving with speed 1000 m/s. b. A body of mass 2 kg moving with speed 50 m/s c. A body of mass 3 kg moving with speed 50 m/s d. A body of mass 50 kg moving with speed 2 m/s e. A body of ...
*December 15, 2011 by Fonda*

**Science**

You are in a speedboat on a river moving in the same direction as the current. The speedometer on the boat shows that its speed is 50 km/h. However, a person on the shore meansures the boat's speed as 57 km/h. How is this possible? The answer is somehow related to the speed of...
*March 20, 2008 by Trissy*

**science**

An earth satellite in an elliptial orbit moves with a) slower speed as it ages b) none of the above c) constant speed d) faster speed as it ages Just need to know if my answer or right or wrong. Thanks! :) b or d but im strongly going for D but i could be wrong
*August 18, 2010 by ant*

**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*

**Physics**

A soccer ball iskicked with an intial horizontal speed of 6 m/s and initial vertical speed of 3.5 m/s. Assume that the projection and landing height are the same, and neglect air resistance. Calculate the following a) the ball's projection speed and angle b)the ball's ...
*November 7, 2013 by Crystal*

**Physics**

1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed. 2. Sam travels by car from one city to another. He drives for 45.0 min at 95.0 km/h, 30.0 min at ...
*June 24, 2014 by Jade*

**algebra1**

the speed of train A is 8mph slower than the speed of train B. Train A travels 220 in the same time it takes train B to travel 260 miles. Find the speed for each train.
*October 18, 2009 by mark*

**Calculus**

An airplane is heading at a bearing of N23°E at a speed of 700 km/hr, but there is a wind blowing from the west at 60 km/hr. If the plane does not make any correction, what will be the bearing of the plane? What is its speed relative to the ground (ground speed = airspeed + ...
*July 29, 2015 by Alexa*

**Physics**

I know how to get the speed if it accelerated the whole time. How do I calculate the cruising speed? Starting from rest, a car travels 1,350 meters in 1 min. It accelerated at 1 m/s^2 until it reached its cruising speed. Then it drove the remaining distance at constant ...
*September 7, 2007 by Colin*

**physics**

Two motorcycles are traveling in opposite directions at the same speed when one of the cyclists blasts his horn, which has frequency of 544 Hz. The other cyclist hears the frequency as 522 Hz. If the speed of sound in air is 344 m/s, what is the speed of the motorcycles
*December 13, 2011 by Anonymous*

**physics**

The cable of a 1800-kg elevator has broken, and the elevator is moving downward at a steady speed of 1.6 m/s. A safety braking system that works on friction prevents the downward speed from increasing. a. speed of boat when leaves ramp (assume that engine turned off once boat ...
*May 1, 2012 by lost*

**algebra II**

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 21, 2010 by Anonymous*

**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*