Friday

October 21, 2016
Number of results: 36,441

**Science (8th grade)**

I am doing a lab and I really need help! I calculated that my snail traveled as his average speed of .136 cm/s, 1.36m/s, and 4896 m/hr. Does that sound right? Also I need help on another thing. My paper says Calculate how long it will take your snail to cross a sidewalk (2m) ...

*February 9, 2013 by Ji*

**physical science**

the same force is constantly applied to two moveable objects. the more massive object will a) travel at the same speed as the lighter one b) increase speed but at a slower rate than the lighter one c) increase speed but at a greater rate than the lighter one d) increase speed ...

*April 12, 2010 by Andrea*

**math**

A baseball diamond is a square with side 90 ft. A batter hits the ball and runs toward first base with a speed of 19 ft/s. (a) At what rate is his distance from second base decreasing when he is halfway to first base? (Round your answer to one decimal place.) ft/s (b) At what ...

*February 26, 2016 by abhishek*

**Physics**

Mike wants to make a free throw; he realizes that if the ball is exactly 20cm above the hoop as it hits the backboard at the top of its trajectory, it will go in. The free throw line is 4.5 m from the plane of the backboard and the hoop is 3 meters from the ground, Mike throws...

*June 9, 2016 by Mike*

**Physics**

In a football game, a tackle running at a constant speed of 5 m/s tackles a stationary receiver. The two fly off horizontally at 4 m/s, before they hit the ground and begin to slow down. If the mass of the tackle is 105 kg, a.) What is the mass of the receiver? 1Your answer is...

*March 22, 2010 by Patrick Siy*

**Physics**

In a football game, a tackle running at a constant speed of 5 m/s tackles a stationary receiver. The two fly off horizontally at 4 m/s, before they hit the ground and begin to slow down. If the mass of the tackle is 105 kg, a.) What is the mass of the receiver? 1Your answer is...

*March 22, 2010 by Patrick Siy*

**ENGLISH**

Please read for any errors. And correct them. I really would appreciate it. After talking with you, I feel I must again apprise you of the importance of keeping in mind that you should not overdo your initial engagement in strenuous exercise. If you start gradually, jogging ...

*February 16, 2011 by ARB*

**statistics**

a golf ball is selected at random from a golf bag. If the golf bag contains 4 brown balls, 9 yellow balls, and 12 orange balls, find the probability of the following event. probability the ball is brown or yellow?

*August 25, 2015 by david*

**Physics**

A model rocket is launched straight upward with an initial speed of 58.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 120 m. (a) What can you say about the motion of the rocket after its engines stop? (b) What is...

*February 7, 2012 by Haroula*

**Mathematics**

Pam and Tim decide to start saving money for their daughter's college education. They open a college savings plan with a 400 initial investment and next month start to make monthly deposits of 100. If the account pays 8.00% compounded monthly, how much will the account be ...

*November 17, 2008 by Maddie*

**Algebra 1 (Steve) **

In a diving siblings showcase, 11yr old Hannah takes off from a 24.61 foot platform with an initial velocity of 9.7 ft/sec at the same time that her brother Tyler, who is older takes off from a 32.81 foot platform with an initial velocity of 4.51ft/sec. Who enters the water ...

*September 6, 2013 by Taylor95 *

**math**

Alvins mother wants to buy snacks for the soccer team, there are 10 juice boxes in a pack and 8 oatmeal bars in a pack,how many packs i f each does she need to buy to get the same amount of juice boxes and oatmeal bars

*September 17, 2015 by Tina *

**College Physics**

Two pucks traveling at each other collide and deflect at 30.0° angles from their original velocities. The mass of Puck B is 20% greater than the mass of Puck A. Before colliding, the pucks approach each other with momenta of equal magnitudes and opposite directions. After ...

*January 24, 2015 by Bill Smithers*

**Calculs I**

A bacterial population grows at a rate proportional to the population size at time t. Let y(t) be the population size at time t. By experiment it is determined that the population at t=15 min is 16000 and at t=45 min it is 22000. (a) What was the initial population? (b)What ...

*November 2, 2014 by Lyca*

**College Mathematics**

(odds) Playing Bingo:When playing bingo, 75 balls are placed in a bin and balls are selected at random. Each ball is marked with a letter and a number as indicated in the following chart: B: 1-15 I: 16-30 N:31-45 G:46-60 O:61-75. For example there are balls marked B1,B2 up to ...

*March 11, 2013 by slomomo*

**Physics**

A 5.0 104 kg space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.5 105 N over a distance of 2600 km. What is the final speed of the probe?

*October 14, 2008 by Brandon*

**Physics**

A 5.0 104 kg space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.5 105 N over a distance of 2600 km. What is the final speed of the probe? m/s

*November 2, 2008 by Brandon*

**Physics**

A sprinter starts from rest in a 100-meter race, accelerates to his full running speed of 10.3 m/s in 1.15 seconds (assume constant acceleration) and continues at that speed for the rest of the race. (a) How far did he run before attaining his full speed? (b) What was his ...

*September 16, 2010 by Phil*

**Physics**

A car (mass 880 kg) is traveling with a speed of 44 mi/h. A bug (mass 7.9 mg) is traveling in the opposite direction. What speed would the bug need in order to slow down the truck by one mile per hour in a big bug splash (i.e., final speed 43 mi/h)?

*October 16, 2010 by Alexis*

**Physics**

A car (mass 880 kg) is traveling with a speed of 44 mi/h. A bug (mass 7.9 mg) is traveling in the opposite direction. What speed would the bug need in order to slow down the truck by one mile per hour in a big bug splash (i.e., final speed 43 mi/h)?

*October 16, 2010 by Alexis*

**Physics**

A 4.5 104-kg space probe is traveling at a speed of 15000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 3.0 105 N over a distance of 2400 km. What is the final speed of the probe?

*October 23, 2010 by Xavier*

**Algebra II**

A salesman drove from his home to a nearby city at an average speed of 40 mi/. He returned home at an average speed of 50 mi/h. What was his average speed for the entire trip? I tried this question, and apparently the answer isn't 45 mph. It's something of a trick question. ...

*November 24, 2010 by Indigo*

**physics help!!**

A 5.50 104 kg space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.00 105 N over a distance of 2600 km. What is the final speed of the probe?

*January 26, 2011 by maria*

**physics**

A 5.50 104 kg space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.00 105 N over a distance of 2600 km. What is the final speed of the probe?

*January 26, 2011 by maria*

**Physics**

A car (mass 800 kg) is traveling with a speed of 37 mi/h. A bug (mass 8.7 mg) is traveling in the opposite direction. What speed would the bug need in order to slow down the truck by one mile per hour in a big bug splash (i.e., final speed 36 mi/h)?

*November 2, 2012 by KT*

**physics**

A 7.00 104-kg space probe is traveling at a speed of 12000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.00 105 N over a distance of 2700 km. What is the final speed of the probe?

*November 11, 2012 by Anonymous*

**Algebra**

Walking Speed The avg. walking speed R of a person living in a city of population P in thousands is modeled by the function R(P)=0.37 times ln P + 0.05. where R is in feet per second. The populatin of Boston is 532,000, find the average walking speed of people living in boston.

*June 23, 2015 by Megan*

**English**

1. On the one hand they want to go abroad, but on the other hand they want to save more money. 2. On the one hand they like playing ping-pong, but on the other hand they want to go back home early. 3. On the one hand they want to play soccer, but on the other hand they want to...

*June 23, 2015 by rfvv*

**Math**

A person standing near the edge of a cliff 120 feet above a lake throws a rock upward with an initial speed of 40 feet per second. The height of the rock above the lake at the bottom of the cliff is a function of time and is described by the function H(t) = –16t2 + 40t + 120. ...

*July 16, 2011 by Tina*

**chemistry**

Haber process at 127C: 1N2 + 3H2 -----> 2 NH3 [NH3] @ equilibrium= 0.031M [N2] @ initial =0.85 M [H2] @ initial =0.0031 M Calc Keq for the reaction. This is how I did it: 1N2 + 3H2 -----> 2 NH3 i:0.85 0.0031 0 c: -X -3X +2X e: 0.85-X 0.0031-3X 0.031=2X X=0.0155 Keq= ([0....

*May 11, 2012 by Holly*

**calculus/finite**

I am taking an online finite math class, so I don't have an instuctor to sit down with me and help me. The text book is so hard to follow. One of the problems I have having a hard time with gives an initial tableau and asks us to use the simplex method to solve each ...

*December 6, 2009 by Amanda*

**physics**

A car is travelling 20m/s along a straight road. The driver sees a 36km/h speed limit sign 100m ahead. What constant retardation is required to reduce the speed to 36km/h in this distance. Find also the time taken by the car to reach the speed limit region.

*February 28, 2016 by dillip*

**Algebra**

A bus covered the 400-km distance between points A and B at a certain speed. On the way back the bus traveled at the same speed for 2 hours and then increased the speed by 10 km/hour until it reached A, thus spending 20 fewer minutes on the return trip. How long did the return...

*April 6, 2016 by Hansel*

**Math**

Please explain to me how to solve this problem: Reid and Maria both play soccer. This season, Reid scored 4 less than twice the number of goals that Maria scored. The difference in the number of goals they scored was 6. How many goals did each of them score?

*December 26, 2011 by Jane*

**science **

A ball of mass m is attached by two strings to a vertical rod. as shown above. The entire system rotates at constant angular velocity about the axis of the rod. a)Assuming is large enough to keep both strings taut, find the force each string exerts on the ball in terms of , m...

*April 8, 2012 by tammy *

**principles of physics**

A carnival has a Ferris wheel where the seats are located halfway between the center and outside rim. If you were at the outside rim, your angular speed while riding on this Ferris wheel would be A) more and your tangential speed less.B) less and your tangential speed more.C...

*March 2, 2012 by CHRIS*

**Physics**

This speed is the maximum possible speed attained by the roller coaster, or the “theoretical speed”. Roller coasters are carefully designed to minimize frictional forces so that they approach these theoretical speeds. The efficiency of a roller coaster design can be found by ...

*December 3, 2013 by Angie Need Help ASAP*

**Physics**

This speed is the maximum possible speed attained by the roller coaster, or the “theoretical speed”. Roller coasters are carefully designed to minimize frictional forces so that they approach these theoretical speeds. The efficiency of a roller coaster design can be found by ...

*December 4, 2013 by Angie Need Help ASAP*

**Physics**

This speed is the maximum possible speed attained by the roller coaster, or the “theoretical speed”. Roller coasters are carefully designed to minimize frictional forces so that they approach these theoretical speeds. The efficiency of a roller coaster design can be found by ...

*December 4, 2013 by Angie Need Help ASAP NOW*

**physics**

A doubly tethered model airplane of mass 1.0 kg is attached to a vertical rod by two very light strings that are 2.0 each in length. the airplane and the the strings rotate in a horizontal circleabout the rod with both the strings remaining taut.The attachment points of the ...

*October 30, 2007 by Sam*

**Math**

A gym has a $4 a month, and a $40 one time initial fee. Another gym has a $10 a month, and a $15 one time initial fee. In how many months will they cos the same?

*November 30, 2015 by No*

**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 PHysics*

**physics**

Find the threshold energy that the incident neutron must have to produce the reaction 1 n 0 + 4 He 2---> 2 H 1 + 3 H 1 For this, like the 1 n 0<--- it is supposed to be written like 1 on the top 0 on the bottom next to n. like the atomic number of neutron and the other ...

*February 16, 2007 by jaimie*

**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**

A 4.03-kg object is thrown vertically upward from the surface of Earth, where the acceleration due to gravity is g1 = 9.81 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of ...

*February 2, 2015 by Breauna*

**math**

Please explain how to solve: Reid and Maria both play soccer. This season, Reid scored 4 less than twice the number of goals that Maria scored. The difference in the number of goals they scored was 6. How many goals did each of them score?

*December 31, 2011 by Jane*

**Chemistry**

Substances A and B, initially at different temperatures, come in contact with each other and reach thermal equilibrium. The mass of substance A is twice the mass of substance B. The specifi c heat capacity of substance B is twice the specifi c heat capacity of substance A. ...

*January 6, 2016 by Anonymous*

**Calculus (Gr.12) Math**

I am not sure how to do this question I know I have to take the derivative but then I am left w/ to unknowns. If a projectile is shot up hill the distance (range) of the landing point up the hill depends on the initial speed of the projectile,v, the angle of inclination, a, ...

*April 6, 2013 by Bob*

**Physics**

A 2.83-kg object is thrown vertically upward from the surface of Mars, where the acceleration due to gravity is g1 = 3.71 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of v2...

*September 26, 2016 by Morgan*

**Physics**

Two chunks of ice are sliding on a frictionless frozen pond. Chunk A, with mass mA=5.0kg, moves with initial velocity vA1=2.0m/s parallel to the x-axis. It collides with chunk B, which has a mass mB=3.0kg and is initially at rest. After the collision, the velocity of chunk A ...

*April 9, 2013 by Anonymous*

**physics**

Two chunks of ice are sliding on a frictionless frozen pond. Chunk A, with mass mA=5.0kg, moves with initial velocity vA1=2.0m/s parallel to the x-axis. It collides with chunk B, which has a mass mB=3.0kg and is initially at rest. After the collision, the velocity of chunk A ...

*January 7, 2016 by ash*

**physics**

Consider a boy standing on a building that is 500m height and another boy standing on the ground. If the boy on the ground throws a ball to the boy standing on the building, with what vertical velocity must the ball be thrown such that it reaches the boy standing on the ...

*July 27, 2011 by divya*

**Physics**

Physics Homework _____________________________________________________________ 1.) A particle at t 1 = -2.0 s is at x 1 = 3.4 cm and at t 2 = 4.5 s is at x2 = 8.5 cm. What is its average velocity? Can you calculate its average speed from this data? ...

*July 20, 2008 by Ruby*

**physics**

1.A cylinder rolls without slipping on a horizontal plane and then up an incline. The linear speed of the cylinder at the beginning is v. What maximal height h will the cylinder reach? 2.Helicopter of mass M holds stationary in the air fires a missile of mass m<< M with ...

*May 3, 2011 by Sandhya*

**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*

**Physics**

A jet aircraft rolls onto the end of a runway before accelerating down the runway for takeoff. At the point where the aircraft leaves the ground, it is traveling at 100 m/s. If the aircraft's initial speed when it rolled onto the runway was 10 m/s, and it accelerates for 20s ...

*January 31, 2016 by Matt*

**physics**

A string under a tension of 50.0 N is used to whirl a rock in a horizontal circle of radius 2.50 m at a speed of 20.4 m/s. The string is pulled in and the speed of the rock increases. When the string is 1.00 m long and the speed of the rock is 51.0 m/s, the string breaks. What...

*September 5, 2013 by Anonymous*

**physics**

A string under a tension of 50.0 N is used to whirl a rock in a horizontal circle of radius 2.50 m at a speed of 20.4 m/s. The string is pulled in and the speed of the rock increases. When the string is 1.00 m long and the speed of the rock is 51.0 m/s, the string breaks. What...

*September 5, 2013 by Anonymous*

**physics**

A string under a tension of 42.6 N is used to whirl a rock in a horizontal circle of radius 2.47 m at a speed of 19.7 m/s. The string is pulled in and the speed of the rock increases. When the string is 1.13 m long and the speed of the rock is 46.9 m/s, the string breaks. What...

*February 22, 2014 by Mimi*

**Astronomy help!**

The average speed of stars relative to the Sun in the solar neighborhood is about 20 km/s (this is the speed at which we see stars moving toward or away from the Sun - NOT their orbital speed). Suppose you discover a star in a solar neighborhood that is moving at a much higher...

*November 22, 2008 by anonymous*

**Math**

For a fundraiser the soccer team is planning to sell potting soil. The two boxes they will use to sell the soil are shown below. How much do you think they ought to charge for the larger box of potting soil based on the volume of the two boxes? Explain in detail and give ...

*April 16, 2013 by Gail*

**math**

Quinn used a scale drawing to build a soccer field near his school. Initially, he wanted the field to be 28 yards long and 17.5 yards wide. He decided to change the length of the field to 36 yards. If the width is to be changed by the same scale factor, what is the new width ...

*January 29, 2014 by Kaitlyn*

**physics**

compare your average speed in the following cases. a. you walk 73.2 m at a speed of 1.2 m/s and then run 73.2 m at a speed of 3.1 m/s along a straight track. b. you walk 1 min. at a speed of 1.2 m/s and then run for 1 min. at 3.1 m/s along a straight track.

*August 16, 2015 by Anonymous*

**Physical Chemistry**

A 3 mg sample of an unknown ideal gas is subjected to an adiabatic and mechanically reversible expansion from an initial pressure of 2 atmospheres to a final pressure of 300 torr. Given that gamma for the gas is 1.532 and that the temperature drop achieved in the expansion is ...

*September 29, 2008 by Amber*

**Physical Chemistry4**

A 3 mg sample of an unknown ideal gas is subjected to an adiabatic and mechanically reversible expansion from an initial pressure of 2 atmospheres to a final pressure of 300 torr. Given that gamma for the gas is 1.532 and that the temperature drop achieved in the expansion is ...

*September 29, 2008 by Amber*

**math**

1). Using the function: y=y0,(.90)^t-1. In this equation y0 is the amount of initial dose and y is the amount of medication still available t hours after drug is administered. Suppose 20mg of the drug is administered. How long will it take for this initial dose to reach 50mg? ...

*November 18, 2012 by Britt*

**CHEM**

The mass of an electron is 9.11*10^-31kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31*10^-10m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00*10^8m/s. Express your answer numerically as a percentage of the...

*November 4, 2007 by K*

**Science**

1. Why is California’s high-speed rail such a groundbreaking effort? 2. Why will it take so long to complete the high-speed rail route? 3.Should other states wait to see if the high-speed rail system works well before starting their own plans for similar systems? Could you ...

*December 23, 2013 by Princess Anna*

**Algebra 2**

If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s(where h and s are in ft, t is in seconds and v is in ft/sec) A package is thrown downward with an initial velocity of -...

*April 29, 2012 by Kelsey*

**Physics**

1) If two gliders of equal mass equal and opposite initial veloity collide perfectly elastically, using the given equation, what are the final velocities of the gliders in terms of the initial velocities equations: MaVa + MbVb = MaV'a + MbV'b (momentum) 1/2MaV^2a + 1/2MbV^2b...

*February 17, 2016 by Anonymous*

**MATH **

The median number of goals scored by 8 players in a certain soccer season is 5. The range of the number of goals scored by those players that season is 4. Determine if the following statement is true, is false, or does not contain enough information. At least one player scored...

*May 1, 2016 by rish*

**Physics**

A string under a tension of 48 N is used to whirl a rock in a horizontal circle of radius 2.4 m at a speed of 18.48 m/s. The string is pulled in, and the speed of the rock increases. When the string is 1.076 m long and the speed of the rock is 49.4 m/s, the string breaks. What...

*February 20, 2011 by CR*

**physics**

A string under a tension of 43 N is used to whirl a rock in a horizontal circle of radius 3.3 m at a speed of 26.46 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.635 m long and the speed of the rock is 80.5 m/s, the string breaks. What...

*December 19, 2011 by Melanie*

**Physics**

A string under a tension of 68 N is used to whirl a rock in a horizontal circle of radius 3.7 m at a speed of 16.53 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.896 m long and the speed of the rock is 71.5 m/s, the string breaks. What...

*June 22, 2014 by Kaylee*

**ece**

Which of the following statements about large motor development in children is correct? A. Catching a ball is easier than throwing for two- and three-year-olds. B. Kicking a ball is difficult for preschool children because it requires balancing skills and eye-foot coordination...

*April 11, 2013 by Anonymous*

**SCIENCE**

1.1 how far does it fall in 5s? 1.2 what is its speed after 4s? 1.3 Determine its speed after falling 125m? 1.4 what is its speed after 2,7 s? 1.5 How far does it fall in 3,8 s? 1.6 How long does it take to fall 54 m? 1.7 Determine its speed after it falls 63 m?

*February 16, 2016 by SOLLY KGOMOTSO MAJADIBODU*

**physics**

Consider an object on which the net force is a resistive force proportional to the square of it's speed? For example assume the resistive force acting on a speed skater is f = -kmv^2, where k is a constant and m is the skater's mass. The skater crosses the finish line of a ...

*February 22, 2010 by steve huerta*

**Physics**

A 4.51-kg object is thrown vertically upward from the surface of Earth, where the acceleration due to gravity is g1 = 9.81 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of ...

*September 15, 2012 by Tabitha Rodriguez*

**algebra**

of 8 Multiple Choice: Please select the best answer and click "submit." The rule below shows how to find the distance traveled of an object thrown downward with initial velocity of 3 feet per second. Which answer expresses that rule in the form of an equation? Square the input...

*February 13, 2012 by guerline*

**chemistry help!!!!!**

Consider the following reaction: Find the equilibrium partial pressures of A and B for each of the following different values of Kp. Assume that the initial partial pressure of B in each case is 1.0 atm, and that the initial partial pressure of A is 0.0 atm. Make any ...

*March 11, 2012 by student*

**Quantative Reasoning College Freshman**

Using the formula y=-16t^2+vt+h help me with this word problem : A firework rocket is fired straight up into the air with an initial velocity of v=192ft/sec From the top of an apartment building h=48ft off the ground. The firework will explode when it reaches the peak (maximum...

*April 5, 2013 by Bonni*

**Science, Physics**

The Pith balls may be positive, negative or neutral. Four pith balls are suspended by insulated threads. The following reaction occurs. a) #2 pith ball is positively charged b) #2 attracts all the other pith balls,. c) #1 and#3 pith balls repel each other. d) #4 attracts all ...

*March 28, 2010 by Sagal*

**Physics**

The best sprinters can run a 100 m in 10.0 s. A 77.2 kg sprinter accelerates uniformly for the first 51.0 m to reach top speed, which he maintains for the remaining 49.0 m. What is the average horizontal component of force exerted on his feet by the ground during acceleration...

*February 11, 2015 by mvlew*

**physics**

A 1500kg car moving at a speed of 20 m/s comes to a halt. How much work was done by the brakes? How fast can a 2.0 horsepower motor lift a 200 kg mass? A boy with a mass of 20 kg is riding on a 10 kg cart which is travelling at 3 m/s. He jumps off in such a way that he lands ...

*July 3, 2015 by G*

**Math (Probability)**

An urn A contains 6 white balls and 7 black balls. And urn B contains 8 white balls and 6 black balls. A person draws a ball at random from one of the two urns. It turns out to be black. What is probability that the ball was drawn from urn A? (A) 7/14 (B) 49/88 (C) 39/88 (D) ...

*October 11, 2012 by AngelG*

**Math (Probability)**

An urn A contains 6 white balls and 7 black balls. And urn B contains 8 white balls and 6 black balls. A person draws a ball at random from one of the two urns. It turns out to be black. What is probability that the ball was drawn from urn A? (A) 7/14 (B) 49/88 (C) 39/88 (D) ...

*October 11, 2012 by AngelG*

**Sport Strategies ~ Football**

The sport of Association football is quite different from football in American culture. In the statements provided, select the one in which association football and american football are not similar. a. having players wear cleated shoes b. having players kick the ball during ...

*February 12, 2014 by Jenny*

**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*

**phsyics **

An airplane with an airspeed of 60 km/hr lands on a runway where the wind speed is 40 km/hr. (a) What is the landing speed of the plane if the wind is head-on? (b) What is the landing speed if the wind is a tailwind, coming from behind the plane?

*March 19, 2014 by price *

**Math**

A car traveling at 46 mi/h slows to a speed of 23 mi/h in 5 seconds. It maintains that speed for 5 seconds and then slows to stop after 5 more seconds. Which graph shows the car's speed overtime

*February 18, 2016 by Amber*

**Grammar**

Under the rule of punctuating sentences. Does this sentence seem right.or does the original sentence need no change. (1- Original Sentence) Between the sixth and seventh floors of the building in the stairwell over in the corner. My answer- The ball bounced between the sixth ...

*October 31, 2006 by PatriciaQuinn*

**Physics**

A first order exponential decay can be written as A(t)= Ae^(-t/r) where A(t) is the amount (of substance) after time t, A is the initial amount at time t=0 and r is the decay time. The fall time is defined as the time in which A(t) falls from 90% to 10% of its initial value. ...

*October 11, 2008 by Beth*

**Physics**

A car (mass 880 kg) is traveling with a speed of 44 mi/h. A bug (mass 7.9 mg) is traveling in the opposite direction. What speed would the bug need in order to slow down the truck by one mile per hour in a big bug splash (i.e., final speed 43 mi/h)? I don't know how to ...

*October 17, 2010 by Alexis*

**Physics**

7. A cyclist is travelling with a speed of 12.0 m/s when she applies the brakes. After slowing for 3.0 s, her speed has been reduced to 4.0 m/s. (a) What distance does she travel during this time? (b) What is her acceleration? (c) If she continues braking, how much longer will...

*October 2, 2012 by Anonymous*

**algebra**

1. The speed of a passenger trin is 18mph faster than the speed of a freight train. The passenger train travels 260 miles in the same time it takes the feight train to travel 170 miles. Find the speed of each train.

*November 17, 2011 by lisa*

**physics**

A machine part rotates at an angular speed of 0.38 rad/s; its speed is then increased to 3.46 rad/s using an angular acceleration of 0.61 rad/s2. Find the angle through which the part ro- tates before reaching this final speed. Answer in units of rad

*October 21, 2011 by phys101*

**physics**

A 60 kg skydiver moving at terminal speed falls 50 m in 1 sec. What power is the skydiver expending on the air? The terminal speed of the falling object is the maximum constant speed the object will reach due to the opposing force of air resistance.

*November 3, 2011 by pakilina*

**PHYSICS**

At what temperature would the rms speed of a nitrogen atom equal the following speeds? (Note: The mass of a nitrogen atom is 2.324 10-26 kg.) (a) the escape speed from Earth, 1.12 104 m/s _____K (b) the escape speed from the Moon, 2.37 103 m/s _____K

*November 14, 2012 by Sarah*

**Maths **

A straight river flows at a speed of 20km/h. A boater starts at the south shore and heads in ths direction of 70degrees from the shore. The boat has a speed of 20km/h in still water. Find the true speed and direction of the boat.

*February 26, 2013 by Anonymous*

**Physics B**

Part 1 Calculate the magnitude of the linear momentum for each of the following cases: A proton with mass 1.67×10 −27 kg moving with a speed of 5.24 × 10 6 m/s. Answer in units of kg · m/s Part 2 A 15.1 g bullet moving with a speed of 327 m/s. Answer in units of kg · m/s...

*November 12, 2012 by Mary*