Monday

August 31, 2015
Number of results: 32,253

**Statistics**

1 39 63 wind speed (km h ) –1 Measurements of wind speed on a certain island were taken over a period of one year. A box-andwhisker plot of the data obtained is displayed above, and the values of the quartiles are as shown. It is suggested that wind speed can be modelled ...
*March 30, 2015 by Osa*

**math**

Running at a constant speed, Andrea covers 15 miles in 2.5 hrs. At this speed, how many minutes will it take her to run 2 miles? I know that I need to use conversion but i don't know how to convert it.
*May 27, 2008 by derek*

**physics**

hi can someone please help me with this question. The SST Concorde flies at a speed of Mach 1.5. What is the half-angle of the conical shock wave formed by the Concorde at this speed?
*February 10, 2009 by bill*

**physics**

Two cars, A and B, are traveling in the same direction, although car A is 174 m behind car B. The speed of A is 25.6 m/s, and the speed of B is 18.6 m/s. How much time does it take for A to catch B?
*October 16, 2010 by megan*

**maths**

a steamer goes downstream in a river and covers the distance between upstream in 6 hours if the speed of the stream is 3 km/hr. firnd the speed of the steamer in still water.
*May 24, 2011 by Abhishek*

**applications involving quadratic**

Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still water.
*June 19, 2011 by Elisa*

**algebra**

rowing. Abby rows 10 km upstream and 10 km back in a total time of 3 hours. The speed of the river is 5km/h.Find Abby's speed in still water.
*July 30, 2011 by sheba*

**physics**

a stone is dtropped from the top of 40m heigh calculate its speed after 2 seconds .Also find the speed ith the stone strikes the ground.
*September 15, 2011 by Anonymous*

**PHYSIC**

THE MOON ORBITS THE EARTH AT A SPEED OF 1.02 KILOMETERS PER SECOND. USE DIMENSIONAL ANALYSIS TO CONVERT THIS SPEED INTO MILES PER HOUR.
*January 14, 2012 by GRISSELL*

**Math**

a motorboat can go 24 miles downstream in the same amount of time that it takes to go 12 miles upstream. The boats speed in still water is 12 mph. What is the speed of the river? mi/hr?
*April 5, 2012 by Nancy*

**Physics**

How much work must be done to increase the speed of an electron (a) from 0.18c to 0.19c and (b) from 0.98c to 0.99c? Note that the speed increase is 0.01c in both cases.
*December 12, 2012 by Brian*

**physics**

A 200.0 N force moves a 120.0 kg crate on a friction less surface from rest to final speed of 9.6 m/s. what is the displacement of the crate at the time it reaches this speed ?
*January 12, 2013 by tommy*

**physics**

Two cars, A and B, are traveling in the same direction, although car A is 204 m behind car B. The speed of A is 22.9 m/s, and the speed of B is 18.6 m/s. How much time does it take for A to catch B?
*September 22, 2013 by help please*

**help i have no idea!!!!!!**

1.It took Jack 4 hours to drive from his house to the beach at a speed of 45km/h. If he takes 5 hours to make the return trip home,what will his speed be?
*March 18, 2014 by Anonymous*

**elem algebra**

the current in a stream moves at a speed of 10 mph. a boat travels 17 mi upstream and 17 mi downstream in a total time of 10 hr. What is the speed of the boat in still water?
*April 19, 2014 by jan*

**science/math**

If a car can go from 0 to 60mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50mi/hr? dont know what equation to use. please help
*September 17, 2014 by douglas*

**math**

Larry's radio controlled car can reach a too speed of 3 meters per second. If his car travels at a top speed of 1 minute and 25 seconds, how far will it go?
*December 19, 2014 by alora*

**physic**

A 7kg box sled is coasting across frictionless ice at speed of 9 m/s when a 9kg package is dropped into it from above. what is the new speed of the sled?
*August 15, 2015 by Nithiya*

**physics**

Consider an object on which the net force is a resistive force proportional to the square of its speed. For example, assume that the resistive forve acting on a speed skater is f=-km[v^2], where k is a constant and m is the skater's mass. The skater crosses the finish line of ...
*March 1, 2007 by Jean*

**physics**

A glider on an air track is connected by springs to either end of the track. Both springs have the same spring constant,k , and the glider has mass M. A)Determine the frequency of the oscillation, assuming no damping, if k= 125N/m and M= 250g. (I got the answer to be 5.03 hz) ...
*May 25, 2009 by kelsi*

**physics**

The wave speed on a string is 148.9 m/s when the tension is 73.4 N. What tension will give a speed 184.9 m/s?
*November 21, 2008 by Anonymous*

**EXAMPLES of SPeed**

What would be some examples of speed? Like how fast a car is going?
*November 13, 2010 by Anonymous*

**Physics**

The wave speed on a string is 146 m/s when the tension is 70.0 N. What tension will give a speed of 183 m/s?
*November 25, 2010 by Michael*

**numericals**

A 100g bullet is firred from a 10 kg gun with a speed of 1000 m/s.What is the speed of recoil of the gun.
*September 12, 2011 by neha*

**physics**

If the rotational speed of a platform is doubled, how does the linear speed anywhere on the platform change?
*December 8, 2011 by mae*

**Physics **

A car accelerates for 5 seconds at 2.1 m/s^2. If the car initially had a speed of 10 m/s, what is the new speed?
*October 7, 2012 by Tori*

**speed**

a train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described?
*January 30, 2014 by Anonymous*

**physics**

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

**physics**

An alpha-particle collides with an oxygen nucleus which is initially at rest. The alpha-particle is scattered at an angle of 67.0 degrees from its initial direction of motion, and the oxygen nucleus recoils at an angle of 52.0 degrees on the other side of this initial ...
*April 24, 2013 by PCm*

**Physics!**

A wheel rotates with a constant angular acceleration of 3.50 rad/s2. The angular speed of the wheel is 2.00 rad/s at t = 0. If the radius of the wheel is doubled, Are the following statements affected? If so, in what way? (Select all that apply.) (1)The angular speed at t = 2....
*December 1, 2009 by Diane M.*

**Math(Statistics)**

A certain soccer team wins (W) with P(W)= 60%, loses(L) with P(L) = 30%, and ties (T) with P(T) = 10%. The team plays three games over the weekend. a.Determine the elements of the event A that the team wins at least twice and does not lose. b.Find P(A) c.Determine the elements...
*October 5, 2011 by Anonymous*

**Physics**

An automobile tire has a radius of 0.380 m, and its center moves forward with a linear speed of v = 19.0 m/s. (a) Determine the angular speed of the wheel. (Assume that there is no slipping of the surfaces in contact during the rolling motion.) rad/s
*April 4, 2008 by Zay*

**Physics**

How much work W must be done on a particle with a mass of m to accelerate it from a speed of 0.905c to a speed of 0.980c? Ok I know that you compute the Lorenz factor gamma but my question is what value would you use for the v? And do you minus anything from it after that?
*April 3, 2009 by Sam*

**physics**

A motorboat whose speed in still water is 3.00 m/s must aim upstream at an angle of 27.0^\circ (with respect to a line perpendicular to the shore) in order to travel directly across the stream. What is the speed of the current?
*September 21, 2010 by Mark*

**physics**

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.50x^5 kg. Its speed is 27.0 m/s, and the net braking force is 4.30x10^5 N. (a)what is its speed 7.50 s later? (b)how far has it traveled in this time?
*March 15, 2011 by Dakota*

**physics**

A dynamite blast at a quarry launches a chunk of rock straight upward, and 2.0s later it is rising at a speed of 15m/s. Assuming air resistance has no effect, calculate its speed A) at launch and B) 5.0s after lauch
*January 29, 2012 by Natasha*

**maths**

The speed of a boat in still water is 8km/h. It travels upstream for a distance of 1.5km and returns(downstream) to the starting point. If the whole trip takes 2/5 hours, find the speed of the stream flow.
*July 15, 2014 by yeung *

**english**

how can this sentence be corrected "The ball was hit by the boy." The sentence was not incorrect in the first place, but it was in passive voice, and both bobby and Kayse have turned it around and put it in active voice. It's always MUCH better to write in active than passive ...
*August 3, 2007 by Crystal*

**physics**

A roller-coaster car with a mass of 550 kg starts at rest from a point 46 m above the ground. At point B, it is 23 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? Incorrect: Your answer is incorrect. . kJ (b) ...
*September 28, 2013 by Tammy*

**physics**

In Figure 8-50, a block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level, where a frictional force stops the block in a distance d. The block's initial speed ...
*February 19, 2011 by Anonymous*

**Physics**

1. An 80.0-kg astronaut is floating at rest a distance of 10.0 m from a spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.0 kg) and flings it into space away from the ship with a speed of 15 m/s. At what speed ...
*September 11, 2014 by Ryzza*

**Physics**

1. An 80.0-kg astronaut is floating at rest a distance of 10.0 m from a spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.0 kg) and flings it into space away from the ship with a speed of 15 m/s. At what speed ...
*September 16, 2014 by Ryzza*

**physics....**

1) In one scene of the movie Raiders of the Lost Ark, Indiana Jones is running along the top of a moving train. He is running at a speed of 10 km/h, relative to the train. The train is moving at a speed of 100 km/h, relative to the ground. Draw a rough sketch of this scene. ...
*June 14, 2012 by april*

**Chemistry**

Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of persulfate ion (S2O3 2-) and the increase in the ...
*February 15, 2013 by AhmadM*

**Physics-Please check answer**

Damon helped me with this calc but I think the answer should be -20, not -22, could someone please check the calculation If a ball is thrown into the wall at 14 m/s and comes off at 6 m/s, what is change of velocity of the ball? I think it would be 14-6 = (-8 m/s) Is that ...
*January 5, 2011 by Russ*

**Physics (simple electronics)**

The electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of a 775 µF capacitor is 330 V. (a) Determine the energy that is used to produce the flash in this ...
*February 24, 2011 by Mike*

**Physics**

A 3.0kg object originally at rest explodes and splits into three fragments. One fragment has a mass of .50kg and flies off along the negative x-axis at a speed of 2.8m/s, and another has a mass of 1.3kg and flies off along the negative y-axis at a speed of 1.5m/s. What are the...
*December 18, 2012 by Kellie*

**Physics**

As shown in the figure 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 target, and a speed (0.466)v after passing through the target. The collision is inelastic ...
*November 2, 2014 by Ellen Q*

**maths**

A bag contains 4 red and 3 black balls. A second bag contains 2 red and 4 black balls. One bag is selected at random. From the selected bag, one ball is drawn. Find the probability that the drawn ball is red.
*February 5, 2013 by Anonymous*

**physics**

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 48.0 m below its starting point at a time 5.00s after it leaves the thrower's hand. Air resistance may be ...
*March 5, 2012 by aisha*

**Physics**

In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 93.0 km/h, to his enemy's car, which is going 130km/h. The enemy's car is 17.0m in front of the Indy's when he lets go of the grenade. 1)If Indy throws the grenade so its initial ...
*February 24, 2011 by Anonymous*

**Physics**

In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 93.0 km/h, to his enemy's car, which is going 130km/h. The enemy's car is 17.0m in front of the Indy's when he lets go of the grenade. 1)If Indy throws the grenade so its initial ...
*February 24, 2011 by Anonymous*

**physics**

Two particles with masses m and 3m are moving toward each other along the x axis with the same initial speeds Vi. Particle m is traveling to the left, and the particle 3m is traveling to the right. They undergo an elastic glancing collision such that particles m is moving in ...
*May 20, 2012 by ace*

**Physics**

A force of 165 N is needed to keep a small boat moving at 2.57 m/s. What is the power required to keep the boat moving at the steady speed? >> I understand that P=Fv but I don't understand the second question. If the resistive force of the water increases with the square...
*October 20, 2010 by Jordan*

**Physics**

A force of 165 N is needed to keep a small boat moving at 2.57 m/s. What is the power required to keep the boat moving at the steady speed? >> I understand that P=Fv but I don't understand the second question. If the resistive force of the water increases with the square...
*October 20, 2010 by Jordan*

**physical**

What is the traverling ball in Hanbball
*October 9, 2011 by Anonymous*

**broadcasting/english**

feedback is appreciated, thanks in advance THOUSANDS OF JOBLESS MICHIGANDERS WILL RECEIVE LESS MONEY IN THEIR WEEKLY EMERGENCY UNEMPLOYMENT CHECKS. MORE THAN 74 THOUSAND PEOPLE IN MICHIGAN RECEIVE BENEFITS THROUGH FEDERALLY FUNDED EMERGENCY UNEMPLOYMENT COMPENSATION PROGRAM (...
*March 14, 2013 by Blaze*

**math**

the chippa soccer association calculates its profit from gate taking match according to this formular p=5n-55 Where p is profit in rand an n is the number of people in the stadium a.calculate the profit when the number of people in the stadium is 250 b.if n=10,find p.explain ...
*October 24, 2010 by nathy*

**chem**

how much water would you need to add to 20.0 mL of 2.0 M NaCl to make a 0.10 M solution? try the formula c1V1 = c2V2 (where c1 is the initial concentration, V1 is the initial volume, c2 is the diluted concentration and V2 is volume you are trying to find) when you have found ...
*May 22, 2007 by beckii*

**Algebra - Please HELP**

During the first part of a trip a canoeist travels 49 miles at a certain speed. The canoeist travels 25 miles on the second part of the trip at a speed of 5mph slower. The total time for the trip is 5hrs. What was the speed on each part of the trip?
*November 9, 2011 by Kelly*

**algebra**

During the first part of a trip a canoeist travels 71 miles at a certain speed. The canoeist travels 5 miles on the second part of the trip at the speed 5mph slower. The total time for the trip is 4hrs. Waht was the speed on each part of the trip
*December 3, 2011 by lisa*

**physics**

An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...
*July 5, 2014 by samantha*

**AP PHYSICS**

The fast train known as teh TGV that runs south from Paris, France, has a scheduled average speed of 216 km/h. If the train goes around a curve at teha speed and the acceleration experienced by the passengers is to be limited to .07g, what is the smallest radius of curvature ...
*September 30, 2007 by Kristen*

**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*

**Language Arts Need Help!!**

Ok these are questions from my language arts book that I was assigned can you please check them i want to make sure they are correct so I now I'm making progress or not thx :-) Read the passage below, and answer the questions that follow. Let's Play! "How many of them do you ...
*December 17, 2012 by Gabby*

**College Chemistry 104**

A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 C. The initial concentrations of Pb+2 and Cu+2 are 0.0500 M and 1.50 M, respectively. A. What is the initial cell potential? B. What is the cell potential when the concentration of Cu+2 has fallen to ...
*May 7, 2013 by Samm*

**math**

Currently, the Toyota Corolla is the best selling car in the world. Suppose that during a test drive of two Corollas, one car travels 224 miles in the same time that the second car travels 175 miles. If the speed of the firstvcar is 14 miles per hour faster than the speed of ...
*December 4, 2012 by val*

**Physics**

At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...
*June 18, 2012 by Katie*

**Physics**

At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...
*June 18, 2012 by Katie*

**physics**

The first graph you plotted is called a speed-time graph. However, information other than speed or time can be obtained from such graphs. (a) What does the area under the line of the graph represent? the distance traveled? (b) Write an equation to represent the area under the ...
*October 21, 2007 by Anonymous*

**algebra**

a car goes at a constant speed for 120 kms, on the way back he goes at half the speed. he drives for a total of 4 hours and 30 minutes. what are the two speeds?
*October 6, 2009 by Kayley*

**Math**

You finish a two-mile walking race in 36.5 minutes. Write an inequality for the average speed of the walkers who finished after you did. (Average Speed = Distance/Time).
*November 4, 2009 by Maria*

**Physics **

A 10,000 kg railroad car traveling at a speed of 24.0 m/s strikes an identical car at rest. If the cars lock together as a result of the collision, what is their common speed afterward?
*January 24, 2010 by Jeremy*

**Physics **

A 10,000 kg railroad car traveling at a speed of 24.0 m/s strikes an identical car at rest. If the cars lock together as a result of the collision, what is their common speed afterward?
*January 24, 2010 by Jeremy*

**Pre Algebra**

A consultant traveled 9 hrs to a meeting. The return trip took only 8 hrs because the speed was 10 miles per hr faster. What was the consultants speed each way?
*March 13, 2010 by Susie*

**Math (urgent) hw due tommorow!**

The speed of a stream is 3 km/h. A boat travels 25 km upstream in the same time it takes to travel 35 km downstream. What is the speed of the boat in still water?
*August 30, 2010 by anj*

**word problem**

2. The excursion boat Holiday travels 35km upstream and then back again in 4h 48min. If the speed of the Holiday in still water is 15km/h, what is the speed of the current?
*October 8, 2010 by Jessica*

**Algebra**

Manuel has a boat that can move at a speed of 30 kn/h in still water. He rides 280 km downstream in a river in the same time it takes to ride 70 km upstream. What is the speed of the river?
*November 3, 2010 by Dusty*

**math**

The top speed of a cheetah is 71 miles per hour. Which of the following answers seems most reasonable for the distance a cheetah would cover in 25 minutes at this speed?
*April 10, 2011 by Mike*

**Physics**

Each tire on a car has a radius of 0.330 m and is rotating with an angular speed of 19.5 revolutions/s. Find the linear speed v of the car, assuming that the tires are not slipping against the ground.
*October 24, 2011 by Jasmin*

**Algebra II**

The heading of a plane is 27.7 degrees NE, and its air speed is 255 mi.h. If the wind is blowing from the south with a velocity of 42.0 mi/h, find the actual direction of travel of the plane, and its ground speed.
*November 2, 2011 by Arielle*

**Physic**

The moon orbits the earth a a speed of 1.02 Kilometers per second. Use dimensional analysis to convert this speed into miles per hour. is the answer .28 m/s????
*January 14, 2012 by Susie*

**physics**

An athlete spins in a circle before releasing a discus with a tangential speed of 9.0 m/s. If his angular speed at the moment of release was 12.0 rad/s, how far was the discus from his axis of rotation?
*March 19, 2012 by Anonymous*

**geometry**

A trailer driver left Miami at 15:45 and arrived at his destination 637.5 km away at 02:15 the next day. a. How long did the jpurney take? b. What was his average speed in km/h c. What was his average speed in ms^-1
*April 24, 2012 by jodi*

**Physics**

A car of mass 1,700 kg is initially traveling at a speed of 25 m/s. The driver then accelerates to a speed of 35 m/s over a distance of 500 m. Calculate the change in the kinetic energy of the car.
*July 11, 2012 by Sierra*

**Physics**

A car of mass 1,700 kg is initially traveling at a speed of 25 m/s. The driver then accelerates to a speed of 35 m/s over a distance of 500 m. Calculate the change in the kinetic energy of the car.
*July 11, 2012 by Sierra*

**tools**

What is the major difference between a high-speed and a high-torque drill? A. Chuck type B. Line cord gage C. Output speed D. Brush thickness
*August 24, 2012 by michael*

**physics**

A hockey puck is hit on a frozen lake and starts moving with a speed of 14.4 m/s. 3.0 seconds later, its speed is 7.3 m/s. (c) How far does the puck travel during the time interval?
*October 4, 2012 by Anonymous*

**physics**

An athlete executing a long jump leaves the ground at a 32.3 angle and travels 7.84 m. What was the takeoff speed? If this speed were increased by just 5.0%, how much longer would the jump be?
*January 28, 2013 by lee*

**Physics**

A hockey puck is hit on a frozen lake and starts moving with a speed of 12.2 m/s. Ex- actly 6.70 s later, its speed is 6.20 m/s. The acceleration of gravity is 9.81 m/s2 . a) What is its average acceleration? Answer in units of m/s2
*February 3, 2014 by Charlie*

**math**

It took Aaron 4 hours to drive 232 miles. Use the equation below to determine what his average rate of speed was. D = r x t D = distance, r = rate of speed, t = time
*May 1, 2014 by Anonymous*

**physics**

a man of 1kg is acted upon a single force Fvector=(4i+4j)N.Due to force, mass is (D,0) to(1m,1m).If initially the speed of the particle 2m/s.Its final speed showd approximately be ?
*August 31, 2014 by ashish *

**Physics**

A 1424-kg railroad car traveling at a speed of 11 m/s strikes an identical car at rest. If the cars lock together as a result of the collision, what is their common speed (in m/s) afterward?
*October 31, 2014 by Ashely*

**Physical science **

A car accelerates at 1.6m.sec along a straight road for 10s then moves at a constant speed for 20s calculate speed after the first 10s
*November 15, 2014 by Jeniffer*

**math 0312**

The current in a stream moves at a speed of 9 mph. A boat travels 17 mi upstream and 17 mi downstream in a total time of 13 hrs. What is the speed of the boat in still water?
*May 4, 2015 by Sara *

**physics**

a bike is moving with a speed of 12m/s in west direction and rain is falling with a speed of 35m/s then at what angle an umbrella must be placed so that rain does not fall on person
*May 30, 2015 by Anonymous*

**chemistry**

1) The activation energy of a certain reaction is 35.3 kJ/mol. At 20 degrees C, the rate constant is 0.0130 s^-1. At what temperature would this reaction go twice as fast? Answer in units of degrees Celsius. i think the answer is around 34, but i keep in getting it screwed up...
*January 29, 2008 by Evets*

**Math**

A certain soccer team wins (W) with P(W)= 60%, loses(L) with P(L) = 30%, and ties (T) with P(T) = 10%. The team plays three games over the weekend. a.Determine the elements of the event A that the team wins at least twice and does not lose. b.Find P(A) c.Determine the elements...
*October 7, 2011 by Anonymous*

**Physics**

Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 17.9 kg and an initial velocity of = 8.82 m/s, due east. Object B, however, has a mass of mB...
*November 4, 2012 by Tim*

**physics**

Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 17.5 kg and an initial velocity of = 8.50 m/s, due east. Object B, however, has a mass of mB...
*October 10, 2013 by Ray*