Saturday

December 10, 2016
Number of results: 37,052

**Physics**

Two soccer players, Mary and Jane, begin running from nearly the same point at the same time. Mary runs in an easterly direction at 3.61 m/s, while Jane takes off in a direction 63.3o north of east at 5.44 m/s. How long is it before they are 23.6 m apart?How far apart are they...

*September 11, 2015 by Martina*

**Physics**

A 5.5 kg object with a speed of 4.0 m/s collides head-on with a 13 kg object moving toward it with a speed of 3.0 m/s. The 13 kg object stops dead after the collision. (a) What is the final speed of the 5.5 kg object? m/s (b) Is the collision elastic? Yes No

*October 29, 2014 by Anonymous*

**physics**

A taxi hurries for 1 hour 3 minutes wit a constant speed of 118km/hr and then for another 1 hour 9 minutes with a constant speed of 40km/hr. What is its average speed for the total trip?

*March 18, 2015 by Kayla*

**Pleaaaaaase help with differential graph question**

Suppose further that the population’s rate of change is governed by the differential equation dP/dt = f(P) where f (P) is the function graphed. For which values of the population P does the population increase? (b) For which values of the population P does the population ...

*December 1, 2014 by Dana*

**Math **

A class of 30 voted on their favorite sport. 1/3 said soccer, 2/3 said basketb. the rest said their favorite is football. what fraction of students favorite sport is football!!! please help

*November 9, 2015 by Brittany*

**Physics**

1.Halley's comet moves about the sun in an elliptical orbit with its closest approach to the sun being 0.59 A.U. and its furthest distance being 35 A.U. [1 Astronomical Unit (A.U.) is the Earth-Sun distance.] If the comet's speed at closest approach is 54 km/s, what is its ...

*July 11, 2010 by Brianna*

**Physics**

A 4.0 kg bowling ball rolling at a velocity of 11m/s down the bowling lane makes a head on collision with a 2.5 kg bowling pin initially at rest. After the collision, the pink has a velocity of 13.54m/s down the bowling lane. What is the final velocity of the bowling ball? ...

*January 7, 2016 by Victor Olidipo*

**physics**

Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 4843 kg), which is made of steel (ρ = 7850 kg/m3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-pong balls. A ping-pong ...

*October 25, 2011 by melisa*

**physics**

Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 3527 kg), which is made of steel (ρ = 7850 kg/m^3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-pong balls. A ping-pong ...

*March 21, 2012 by maria*

**physics**

A horizontal spring, resting on a frictionless tabletop, is stretched 14 from its unstretched configuration and a 1.00- mass is attached to it. The system is released from rest. A fraction of a second later, the spring finds itself compressed 3.6 from its unstretched ...

*October 15, 2010 by J*

**statistics**

Give examples of nominal, ordinal, interval. and ratio data. Then, convert your ratio data example into interval, ordinal, and nominal scales. Measurement Scales Practice 1. Indicate the first letter (N, O, I, R) of the highest possible scale for each of the following measures...

*June 2, 2013 by Lynn*

**Physics**

If an object on a horizontal frictionless surface is attached to a spring, displaced, and then released, it will oscillate. If it is displaced a distance 0.130 m from its equilibrium position and released with zero initial speed. Then after a time 0.803 s its displacement is ...

*January 2, 2007 by Hadi*

**physics**

A commuting student leaves home and drives to school at an average speed of 42.0 km/h. After 22.0 min he realizes that he has forgotten his homework and returns home to get it at the same average speed. It takes 8.0 min to find the report, after which the trip to school 42.0 ...

*August 31, 2011 by USC*

**Physics**

1) An 8.5kg bowling ball dropped 11m hits the ground 1.5 seconds later. What is the magnitude of the force acting on the ball during the fall? 2) Shuttle astronauts climb at a rate of 24.5m/s^2 shortly after takeoff. What apparent weight would a 95kg astronaut have during this...

*December 22, 2011 by Jorge*

**physics**

A gunman standing on a sloping ground fires up the slope. The initial speed of the bullet is v0= 390 m/s. The slope has an angle α= 19 degrees from the horizontal, and the gun points at an angle θ from the horizontal. The gravitational acceleration is g=10 m/s2. (a) ...

*January 10, 2014 by JuanPro*

**physics**

Draw the figure, and calcuate the height above the bottom point the swing starts. (I remember it as 2.3(1-cos25)). the initial energy is mg*height. The final energy is 1/2 m v^2 The difference is frction. A 49 kg child on a 2.3 m long swing is released from rest when the swing...

*February 28, 2007 by bobpursley*

**Math**

Bacteria A has an initial population of 500 and doubles everyday. Bacteria B has an initial population of 50 and triples everyday. How long will it take the population of bacteria B to overtake the population of bacteria A

*October 27, 2013 by Paul*

**MATHS**

a bag contains 8 identical balls of which 5 are yellow and 3 are white.1 ball is removed,its colour is noted and is replaced in the bag.a second ball is drawn.by drawing a table,find the probability(a)both balls are yellow(b)both are white (c)only 1 is white. Both yellow=(5/8...

*June 6, 2007 by CELINA*

**physics**

The firetruck goes around a 180°, 162 m radius circular curve. It enters the curve with a speed of 12.6 m/s and leaves the curve with a speed of 38.8 m/s. Assuming the speed changes at a constant rate, what is the magnitude of the total acceleration of the firetruck just ...

*November 24, 2010 by sandhu*

**Science**

when you ride in a train that passes a train moving in the opposite direction, the other train appears to rush past you at a greater speed than if you were watching from a parked car at a crossing. how does the speed of your train affect your impression of the passing train's ...

*November 2, 2011 by Andrew*

**physics**

Snowballs are thrown with a speed of 12.5 m/s from a roof 7.8 m above the ground. Snowball A is thrown straight downward; snowball B is thrown in a direction 16° above the horizontal. (a) Is the landing speed of snowball A greater than, less than, or the same as the landing ...

*October 12, 2012 by HELP*

**algebra 2**

I don't know how to do this the speed of train A is 18mph slower than the speed of train B train A travels 190 miles in the same time it takes train B to travel 280 miles find the speed of each train please help so i can pass my quiz.

*March 29, 2012 by karon*

**Math probability**

Trevor's soccer bag holds lots of socks: 4 red, seven green, three white, and two purple. He takes two socks, what is the probability that he will get red and green socks?

*March 31, 2014 by Anonymous*

**Physics**

A cannon fires a shell at an angle of 55.0 above the horizontal. The shell has a mass of 17.5kg, and its initial speed as it leaves the cannon is 289m/s. The cannon is not anchored to the ground. It is mounted on a base -a large block of wood- which is sittin go n a level ...

*November 2, 2009 by John*

**physics**

From the edge of the rooftop of a building, a boy throws a stone at an angle 30.0° above the horizontal. The stone hits the ground 4.10 s later, 112 m away from the base of the building. (Ignore air resistance.) (a) Find the initial velocity of the stone. magnitude _____ ...

*February 14, 2010 by jenn*

**English**

I will distribute a sheet of paper to each of you. Then you should draw a big box on the back first. After that draw three vertical lines and five horizontal lines to make a table. Then you can have three columns and six rows in the table. In the first row, write Name, What ...

*May 30, 2014 by rfvv*

**Business**

Learning economics is like having you own crystal ball. The more you understand it as a social science, the more you understand how our economy and political system works. I say like a crystal ball, because you will be able to see things that other people without the same ...

*January 23, 2012 by Crissy*

**physics**

A 0.145 kg baseball is pitched at 42 m/s. The batter hits it horizontally to the pitcher at 58 m/s. GIVEN: m = 0.145 kg v = 42 m/s batter v = 58 m/s a. Find the change in momentum of the ball. p = mv p = (0.145)(42) p = 6.09 --> What velocity would I use? Would i use the ...

*December 25, 2009 by Heart*

**Physics**

A small block slides along a track from one level to a higher level, by moving through an intermediate valley (see Figure). The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. Assume that the block's ...

*December 26, 2013 by George*

**chemistry 12**

Equilibrium concentrations (a)(mol/L)// (b)(mol/L)// (c)(mol/L) 0.040 // 0.066 // 1.72x10^-2 0.080 // 0.017 // 8.8x10^-3 0.030 // 0.024 // 4.7x10^-3 My data was collected at 25○C for the reaction A(g) + B(g) = C(g) What i have to do now is involving three different ...

*September 26, 2011 by Robyn*

**Physics**

NEED HELP On a flat battle ground, a catapult is used to launch a rock with a velocity of 25m/s at angle 30 degrees above the horizontal.? Sketch the situation and decompose the initial velocity vector. WHat are the initial values for Vx and Vy? Calculate the maximum height ...

*August 19, 2014 by Jeesha*

**Tough Math**

Suppose the ball was 3.24 feet above ground when it was hit, and that it reached a maximum height of approximately 102.51 feet when it had traveled a ground distance of approximately 214.26 feet. The ball lands after traveling a ground distance of approximately 432 feet. Find ...

*January 23, 2012 by HUNU*

**Physics**

A 0.28 kg softball has a velocity of 16 m/s at an angle of 34° below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a velocity of (a) 21 m/...

*May 13, 2014 by John*

**Physics**

A soccer player extends her lower leg in a kicking motion by exerting a force with the muscle above the knee in the front of her leg. Suppose she produces an angular acceleration of 28.5 rad/s2 and her lower leg has a moment of inertia of 0.7 kg⋅m2. What is the force, in...

*October 19, 2014 by Kate*

**Physics**

During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. The Figure shows a cross section of Mt. Fuji, in Japan. (a) At what initial speed would a bomb have to be ejected, at angle q0 = 35° to the ...

*January 2, 2016 by Sam*

**chemistry**

I have to calculate the ΔV= final volume-initial volume For the first trial the final volume was .005mL the initial volume was .03mL, which equaled to -.025mL. The volume was negative because it was exothermic reaction. For the second trial the final volume was 0.015 and ...

*November 22, 2014 by xx*

**chemistry**

I have to calculate the ΔV= final volume-initial volume For the first trial the final volume was .005mL the initial volume was .03mL, which equaled to -.025mL. The volume was negative because it was exothermic reaction. For the second trial the final volume was 0.015 and ...

*November 23, 2014 by xx*

**Math**

11. A rocket is fired upward from some initial height above the ground. Its height h in feet above the ground t seconds after it is fired is given by h = -16t2 + 48t +448. (i) What is its initial height? __________ ft. (ii) What is its maximum height? ___________ ft. (iii) How...

*October 3, 2011 by Alyson*

**PHYSICS**

A toy gun launches a small plastic sphere using a spring. The spring has a spring constanct of 20 J/M^2 and the plastic sphere has a mass of 25 grams. Before launch x initial is -10cm velocity initial is 0 m/s After launch x final is o cm Identify the known quantities and ...

*February 28, 2012 by GRISSELL*

**How to Set Up Equation**

Given that the initial rate constant is at an initial temperature of 25 degrees C, what would the rate constant be at a temperature of 130 degrees C for the same reaction described in Part A? What I need help with is how to set up the equation. I have the Ea, which is 41.4 ...

*February 3, 2013 by Amy*

**Physical Science [repost]**

Can someone please check if my answers for these questions are correct? Thanks! 1.Explain in terms of force and distance how using a ramp to load boxes into a truck makes work easier. (Ans-) Less force is applied but the distance is longer. 2.A ball sitting on the top of a ...

*May 3, 2009 by mysterychicken*

**math**

a launched rocket has an altitude, in meters, given by the polynimial h+vt-4.9t^2 where h is the height, in meters, from which the launch occurs, at velocity v in meters per second, and t is the number of seconds for which the rocket is airborne. If a rocket is launched from ...

*March 21, 2013 by pam*

**Direct way to improve yield of ball mill**

The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided Grate Ball Mill and ...

*June 13, 2013 by selina*

**physics**

The "reaction time" of the average automobile driver is about 0.700 s. (The reaction time is the interval between the perception of a signal to stop and the application of the brakes.) If an automobile can slow down with an acceleration of 12.0 ft/s^{2}, compute the total ...

*January 20, 2011 by mely*

**Math**

A box contains some red balls and some blue balls. There are four more blue balls than red balls. A ball is removed at random, replaced and a second ball randomly removed. The probability that the two balls are different colours is 21/50. How many balls of each colour are in ...

*November 10, 2016 by Courtney*

**Calculus 3**

A medieval city has the shape of a square and is protected by walls with length 550 m and height 16 m. You are the commander of an attacking army and the closest you can get to the wall is 100 m. Your plan is to set fire to the city by catapulting heated rocks over the wall (...

*October 7, 2012 by Jerry*

**physics**

1. How far (in meters) must a 600 kg pile driver fall, if it is to do 14000 J of work? 2. A spring whose spring constant is 150 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.600 kg ball when released? 3. A 550 N crate rests on the floor. How much ...

*July 7, 2010 by Ricky*

**physics**

1. How far (in meters) must a 600 kg pile driver fall, if it is to do 14000 J of work? 2. A spring whose spring constant is 150 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.600 kg ball when released? 3. A 550 N crate rests on the floor. How much ...

*July 7, 2010 by Ricky*

**child day care management**

Q; Melissa plays with the same four girls every day. She has a lot of energy,is independent,and is concerned about what her friends think.Melissa kikes soccer and baseball and takes pleasure in beting up the boy's team. Melissa is most likely to be ____ years old. A.3-5 B.5-7 ...

*February 13, 2011 by alex*

**math-algebra**

A launched rocket has an altitude, in meters, given by the polynomial h = vt -4.9t^2, where h is the height, in meters, from which the launch occurs, at velocity v in meters per second, and t is the number of seconds for which the rocket is airborne. If a rocket is launched ...

*October 9, 2010 by Michelle*

**Algbrah**

A launched rocket has an altitude in meters, given by the polynomial h+vt-4.9^2, h is the height in meters v is the velocity in meters per second and t is the number of seconds for which it takes the rocket to become airborne. If the rocket is launched from the top of a tower ...

*May 15, 2011 by Jessie*

**statistics**

Box A contains 4 red and 6 blue balls. Box B contains 5 red and 10 blue balls. A box is selected at random and a ball is drawn. Find the probability that the ball is blue, given that it came from Box B.

*September 22, 2010 by Lori*

**statistics**

Box A contains 4 red and 6 blue balls. Box B contains 5 red and 10 blue balls. A box is selected at random and a ball is drawn. Find the probability that the ball is blue, given that it came from Box B.

*September 22, 2010 by Lori*

**Statistics**

Box A contains 4 red and 6 blue balls. Box B contains 5 red and 10 blue balls. A box is selected at random and a ball is drawn. Find the probability that the ball is blue, given that it came from Box B.

*September 23, 2010 by Lori*

**physics help pleased**

Two trains on separate tracks move toward one another. Train 1 has a speed of 125 km/h and train 2 a speed of 100.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of sound is 345 m/s.)

*January 28, 2011 by julie*

**Physics**

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.50 x 105 kg, its speed is 27.0 m/s, and the net braking force is 4.73 x 105 N. (a) What is its speed 7.50 s later? (b) How far has it traveled in this time? (a) Its speed 7.50 s ...

*October 12, 2012 by Emma*

**Physics**

A 3.4 kg mass is shot by a sling shot with an initial velocity of 4.5 m/s. When the mass is in the air at a height of 50m, it is still traveling upwards. What is its velocity at that height? Draw energy pie graphs for the initial and final state. (Hint: You will have to use ...

*March 19, 2013 by Wilson*

**physics**

A train travel 20km at a uniform speed 60km/1hr and the next 20km at a uniform speed of 80km/1hr calculate its average speed

*April 1, 2014 by prabhjot*

**maths**

If a car travels first 100 kms by 40 km per hour speed and next 200 kms by 60 km per hour speed,then what is the average speed.

*March 10, 2015 by ram*

**psychology**

The sentences, "Lee gave the ball to Lynne" and "Lynne received the ball from Lee," have the same: surface structure. syntax. surface and deep structures. deep structure. Does this sentence have both surface and deep structure? From reading my text book, I believe it does, but...

*October 31, 2010 by cindy*

**Algebra~Scary problem!**

A launched rocket has an altitude, in meters, given by the polynomial h+vt-4.9t^2, where h is the height, in meters, from which the launch occurs, at the velocity v in meters per second, and the t is the number of seconds for which the rocket is airborne. If a rocket is ...

*May 27, 2008 by Sahara*

**math 117**

A launched rocket has an altitude in meters, given by the polynomial h+vt-4.9^2, h is the height in meters v is the velocity in meters per second and t is the number of seconds for which it takes the rocket to become airborne. If the rocket is launched from the top of a tower ...

*May 15, 2011 by Jessie*

**math 116**

A launched rocket has an altitude in meters, given by the polynomial h+vt-4.9^2, h is the height in meters v is the velocity in meters per second and t is the number of seconds for which it takes the rocket to become airborne. If the rocket is launched from the top of a tower ...

*May 15, 2011 by Jessie*

**math 117**

A launched rocket has an altitude in meters, given by the polynomial h+vt-4.9^2, h is the height in meters v is the velocity in meters per second and t is the number of seconds for which it takes the rocket to become airborne. If the rocket is launched from the top of a tower ...

*May 15, 2011 by Jessica*

**math 117**

A launched rocket has an altitude in meters, given by the polynomial h+vt-4.9^2, h is the height in meters v is the velocity in meters per second and t is the number of seconds for which it takes the rocket to become airborne. If the rocket is launched from the top of a tower ...

*May 16, 2011 by sue*

**physics**

An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 75.0 cm long and has a mass of 5.28 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Responses Physics - bobpursley, Saturday...

*October 12, 2008 by Sara*

**Calc B/C**

Assume no air friction and that the acceleration due to gravity is 10 meters/sec^2. A ball is moving horizontally at a rate of 5 meters/sec. until it falls off the edge of a platform. The height, h, of the platform would have to be ___ meters if the ball hit the ground 8 ...

*February 7, 2015 by Anon*

**computers please help**

Hi i'm taking a intro to technology class and we have this assignment where we take different types of computers and find information. but i'm stuck. i need to find the speed of the motherboard for all of them. here's a list of them i have find for: 80386Dx, 80386SX, 80486DX, ...

*September 6, 2006 by Anonymous*

**physics**

A non stop bus goes from one station to another at a speed of 54 km/h. The bus returns from the second station to first station at a speed of 36 km/h. Find the average speed of the bus.

*July 3, 2011 by anil*

**Physics(Please help)**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.44 x 104 rad/s to an angular speed of 5.05 x 104 rad/s. In the process, the bit turns through 1.77 x 104 rad. Assuming a constant angular acceleration, how long would it take the bit to ...

*June 7, 2012 by Hannah*

**Physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 42 ∘. The gravitational acceleration is g=10 m/s2 (a) At what ...

*October 6, 2013 by Anonymous*

**6th grade math **

To qualify for a store discount, Clay's soccer team must spend at least $560 for new jerseys. The team needs 20 jerseys. Write and solve an inequality to represent how much the team should spend on each jersey to qualify for the discount.

*February 8, 2015 by Alex*

**MATH 12 HELP!**

One bag contains 4 white balls and 6 black balls. Another bag contains 8 white balls and 2 black balls. A coin tossed to select a bad, then a ball is randomly selected from that bag. Suppose white ball was drawn. What is the probability that it came from the first bag?

*May 20, 2012 by the man*

**Physics**

A block of mass m is projected at speed Vo up a rough plane inclined at an angle theta to the horizontal. Model the block as a particle and assume that the frictional force acting is given by kv^2, where v is the block's speed and k is a constant. What is the block's equation ...

*May 13, 2012 by Anonymous*

**Physics**

A 645-kg elevator starts from rest and reaches a cruising speed of 1.47 m/s after 3.13 seconds. It moved 2.75 m during that time. What average power (W) is delivered by the motor during the initial acceleration of the elevator during the first 3.13 seconds? The correct ...

*June 6, 2011 by Casey*

**Algebra 2 Homework**

1.) Identify the axis of symmetry. f(x) = x2 + 10x + 9 2.) Find the vertex for the parabola given below. f(x) = 3x2 + 12x + 16 3.) Find the quadratic function that includes each set of values. (1, 0), (2, 5), (4, 21) 4.) f(x) = -2x2 - 3x + 35 Is this parabola concave up or ...

*February 27, 2014 by Ria*

**algebra**

The speed of train A is 6 mph slower than the speed of train B. Train A travels 230 miles in the same time it takes train B to travel 260 miles. Find the speed of each train?

*March 10, 2010 by kathy*

**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*

**Algebra**

The speed of train A is 6 mph slower than the speed of train B. Train A travels 200 miles in the same time it takes train B to travel 230 miles. Find the speed of each train?

*July 11, 2010 by Jacqueline*

**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*

**Chemistry**

Hello, I have a question that reads: Using the average molarity of your initial acetic acid solutions, the initial volumes, and the volume of NaOH added to reach the equivalence point, calculate the [C2H3O2-] concentration at the equivalence point. You should report 4 ...

*May 9, 2010 by Jens*

**math**

The height of a rocket in meters t seconds after it is launched is approximated by the polynomial 0.5 at2 + vt + y where a is always -9.8, v is the initial velocity, and h is the initial height. A 300X was launched from a height of 10 meters. What was its height after 3 seconds?

*August 16, 2010 by jacob*

**Physics - Charge on pith balls**

Two pith balls equally charged and each with a mass of 1.5. White one ball is suspended by a thread, the other is brought close to it and a state of equilibrium is reached. In that situation, the two balls are separated by 2.6cm and the thread attached to the suspended ball ...

*October 18, 2010 by Anonymous*

**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*

**calculus**

Suppose that the cost of operating a truck in Mexico is cents per mile when the truck runs at a steady speed of v miles per hour. The top speed of the truck is 100 mph. Assume that the driver is paid 10 dollars per hour to drive the truck, and he is to begin a 1600 mile trip. ...

*November 10, 2007 by annoymous*

**physics help**

An automobile tire has a radius of 0.280 m, and its center moves forward with a linear speed of v = 18.0 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 (b) Relative to the axle, ...

*November 27, 2010 by john*

**Chemistry**

Any object, be it a space satellite or a molecule, must attain an initial upward velocity of at least 11.2 km/s in order to escape the gravitational attraction of the earth. What would be the kinetic energy in joules of a satellite weighing 2337 lb that has the speed equal to ...

*June 8, 2011 by Lance*

**algebra**

These are very easy to set up with a "chart" ---------Distance-----Rate---Time (D=RxT) slow way --6x----------x-------6 fast way - 5(x+7)-----x+7------5 so 6x = 5(x+7) 6x=5x+35+ x=35 The speed on the slower trip was 35 mph, and on the return trip 42 mph A consultant traveled 6...

*June 17, 2007 by Reiny*

**physics **

Two small plastic balls hang from threads of negligible mass. Each ball has a mass of 0.14g and a charge of magnitude q. the balls are attracted to each other. When in equilibrium, the balls are separated by a distance of 2.05cm and the threads attached to the balls make an ...

*January 18, 2013 by stoic-rider77*

**chemistry**

if initial pressure is 5 atm, initial volume is 6 liter what will be final pressure in atm when final volume is 10 lit?

*March 5, 2012 by Anonymous*

**chemistry**

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.15 atm . The piston was pushed down to change the volume to 1.00 L. Calculate the final pressure of the gas ...

*October 9, 2008 by Anonymous*

**Physics**

As its volume is doubled from an initial value of 0.088 m3, a sample of gas is held at a constant pressure of 3.4 × 104 Pa by heating. Then, while a constant volume is maintained, the gas is cooled back to its initial temperature. The work that the gas does on the environment...

*June 21, 2012 by Kaley*

**Chemistry**

How many moles of gas must be forced into a 3.5 L ball to give it a gauge pressure of 9.4 psi at 25 degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.7 psi so that the total pressure in the ball is 24.1 psi Ok so I'm ...

*October 18, 2011 by Monique *

**Math**

A bag contains 5 red balls and 4 white balls. Two balls are drawn at random from the bag. The first ball drawn is put back into the bag before the second ball is drawn. What is the probability that two balls drawn are both red?

*April 16, 2012 by Sandeep*

**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*

**physics**

I do not understand the answer that was given to me on a post dated Nov. 23. Please help explain my questions that appear at the end of this post. Bart ------------------- Posted by Bart on Wednesday, November 23, 2011 at 6:52am. A baseball is hit with a speed of 27 meters per...

*December 4, 2011 by Bart*

**Physics**

An automatic drier spins wet clothes at an angular speed of 4.8 rad/s. Starting from rest, the drier reaches its operating speed with an average angular acceleration of 3.6 rad/s2. How long does it take the drier to come up to speed?

*March 6, 2008 by Zach*

**Physics**

A golfer rides in a golf cart at an average speed of 3.10 m/s for 21.0 s. She then gets out of the cart and starts walking at an average speed of 1.60 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 2.10 m/s?

*October 2, 2009 by Kristina*

**physics**

A golfer rides in a golf cart at an average speed of 3.10 m/s for 26.0 s. She then gets out of the cart and starts walking at an average speed of 1.20 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 2.30 m/s?

*January 15, 2010 by Mary*

**Physics**

A golfer rides in a golf cart at an average speed of 3.10 m/s for 23.0 s. She then gets out of the cart and starts walking at an average speed of 1.30 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 2.00 m/s?

*October 1, 2010 by Sean *