Sunday

February 7, 2016
Number of results: 34,042

**Differental Equations**

a) Sketch the phase line for the differential equation dy/dt=1/((y-2)(y+1)) and discuss the behavior of the solution with initial condition y(0)=1/2 b) Apply analytic techniques to the initial-value problem dy/dt=1/((y-2)(y+1))), y(0)=1/2 and compare your results with your ...
*February 3, 2013 by Erica*

**physics 111 "2"**

1 A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take 20 m/s 10 m/s 30 m/s 15 m/s 2 What is common to the variation in the range and the height of a projectile? time of flight vertical acceleration horizontal ...
*April 24, 2015 by Cali franco*

**chemistry**

The speed of a substance is 13.056 m/s. What is the speed in cm/Ms??
*September 11, 2012 by jeff*

**Physics**

A ball is thrown horizontally from the top of a building 21.6 m high. The ball strikes the ground at a point 123 m from the base of the building. Find the x component of its velocity just before it strikes the ground. Find the y component of its velocity just before it ...
*February 2, 2012 by Anonymous*

**Physics**

A ball is thrown horizontally from the top of a building 21.6 m high. The ball strikes the ground at a point 123 m from the base of the building. Find the x component of its velocity just before it strikes the ground. Find the y component of its velocity just before it strikes...
*February 4, 2012 by Madison*

**physics**

A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift is performed in three stages, each requiring a vertical distance of 7.70 m: (a) the initially stationary spelunker is accelerated to a speed of 3.80 m...
*February 13, 2008 by dawn*

**Re: PHYSICS**

"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring has negligible mass and...
*February 27, 2007 by COFFEE*

**college algebra**

Deshaun is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A has no initial fee but charges .70 cents for every mile driven. Company B charges an initial fee of $50 and an additional .20 cents for every...
*September 22, 2012 by dawn*

**Mechanical Behavior of Materials**

The television coverage of the World Series showed several remarkable slow-motion views of the deflection of the bat as it hit the ball. Major league wood baseball bats are made of ash. A typical major league bat has a length of 0.95m and a tapering circular cross section. The...
*November 8, 2014 by zxcv*

**Physics**

A 10000 N car comes to a bridge during a storm and finds the bridge washed out. The 750 N driver must get to the other side, so he decides to try leaping it with his car. The side the car is on is 21.6 m above the river, while the opposite side is a mere 3.60 m above the river...
*September 16, 2006 by Josh*

**physics**

A rifle with weight of 30N fires a 5.0g bullet with a speed of 300ms^-1. a) Find the recoil speed of the rifle. b) if a700N man holds the rifle firmly against his shoulder, find the recoil speed of man and rifle.
*January 7, 2015 by saima*

**Chemistry**

A flask has 1.00 L of O2 (g) at STP (the amount of gas and volume are held constant, P=1 bar) and the second has 1.00 L of O2 at 100 C. What mass of O2 must release if we get the pressure to remain at 1.00 bar when it's heated to 100 C? Can someone please explain how to do ...
*October 3, 2012 by Kristine*

**Physics - repost**

A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.88 m. With the string hanging vertically, the object is given an initial velocity of 1.7 m/s parallel to the ground and swings upward on a ...
*October 9, 2012 by Ben*

**math**

(TRANSPORTATION COST) A truck is hired to transport goods from a factory to a warehouse. The driver’s wages are figured by the hour and so are inversely proportional to the speed at which the truck is driven. The cost of gasoline is directly proportional to the speed. Express ...
*November 12, 2011 by m.h.j*

**Math**

Probability-- There are two boxes...the first box has 3 black balls and 1 blue ball in it. The second box has 6 black balls and 2 in blue balls in it. a. Which of the following two boxes would you choose if you were picking 1 ball and wanted black? Justify your answer. b. Then...
*November 12, 2013 by Anonymous*

** math**

Trey keeps sports cards in 3 drawers. Each drawer contains exactly 120 cards. In each drawer 2/3, of the cards are baseball cards, and 1/3 of the cards are a mixture of football, hockey, baseball, and soccer cards. If Trey decides to trade 1/4 of his baseball cards how many ...
*February 21, 2013 by bianca*

**physic**

Hi! could you help me to start this problem becuase I had try so many time and did not get it right at all please. Thank you so much. A rifle with a weight of 20 N fires a 4.0 g bullet with a speed of 260 m/s. (a) Find the recoil speed of the rifle. (b) If a 775 N man holds ...
*October 29, 2009 by Chan*

**Physics HELP**

An ultrasound transducer used to measure the speed of blood cells is oriented at an angle of 45 degrees to the direction of the blood flow. if the frequency of the sound emitted by the transducer is 1.5 Mhz and the doppler shift is 268Hz, calculate the speed of blood cells. ...
*June 15, 2012 by Jason *

**Medium Speed wet milling machine and the relations**

So far, the world's medium-speed milling machines are dry law. Hot air carrier that is, separation, sorting products. Therefore in need of a massive and complicated: medium heat generator, fans, vents Central, separator , explosion-proof system (inert gas source), dedusting ...
*July 22, 2012 by jiandan*

**physics**

A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.2 m/s at ground level. Its engines then fire and it accelerates upward at 4.20 m/s2 until it reaches an altitude of 960 m. At that point its engines fail, and the rocket goes into ...
*October 10, 2009 by Jamie*

**physics**

A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 81.0 m/s at ground level. Its engines then fire and it accelerates upward at 4.10 m/s2 until it reaches an altitude of 940 m. At that point its engines fail, and the rocket goes into ...
*February 10, 2011 by chuikia*

**Mechanical Behavior on Materials / math**

The television coverage of the World Series showed several remarkable slow-motion views of the deflection of the bat as it hit the ball. Major league wood baseball bats are made of ash. A typical major league bat has a length of 0.95m and a tapering circular cross section. The...
*November 9, 2015 by mel*

**physics**

Bob, who has a mass of 80kg , can throw a 550g rock with a speed of 27m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. What constant force must Bob exert on the rock to throw it with this speed? If Bob ...
*October 30, 2014 by Justin*

**Physics**

a baseball is hit at a height h = 1.10 m and then caught at the same height. It travels alongside a wall, moving up past the top of the wall 1.2 s after it is hit and then down past the top of the wall 3.2 s later, at distance D = 53 m farther along the wall. (a) What ...
*September 13, 2010 by Antonio*

**Alegebra 1**

Urn A has balls numbered 1 through 7. Urn B has balls numbered 1 through 5. A ball is selected at random from urn A and then a ball is selected at random from urn B. What is the probability that a 4 is drawn from A followed by a 2 from B?
*September 8, 2009 by maria*

**Physics**

A ball (mass = 250 g) on the end of an ideal string is moving in circular motion as a conical pendulum. The length L of the string is 1.92 m and the angle with the vertical is 37 degrees. A) What is the magnitude of the torque (N m) and direction (from the listed answers) of ...
*November 13, 2010 by Miki*

**physics**

A circular coil with a radius of 25 cm has 20 turns. The coil is oriented perpendicularly to a magnetic field whose initial magnitude is 3.2 T. Suddenly, the magnetic field vanishes in 0.4 s. a. What is the initial magnetic flux in the coil? b. What is the induced emf in the ...
*August 26, 2013 by jim*

**College Physics **

A 40 kg child is standing on the edge of a merry-go-round in a playground. Before they were deemed too dangerous, these were quite common. They were just huge rotating platforms you could sit on while someone spun you around in uniform circular motion until you screamed in ...
*April 8, 2012 by Taylor*

**physics**

The pendulum shown right has a mass of 0.26 kg and moves to the right from point B to point A. At point B the speed of the mass is 3.2 m/s. (i) What is the change in the gravitational potential energy in the motion from B to A? (ii) What is the mass speed at point A? (iii) If...
*March 8, 2013 by Meder*

**Chemistry**

The reaction for my lab is Mg(s)+2HCl(aq)--> MgCl2(aq)+H2(g) I need to find the pressure of the hydrogen gas. Initial Pressure = 0.98692 atm Total Pressure = 1.64816 atm I don't know if I calculated the pressure of hydrogen gas correctly. I used the formula Total Pressure=...
*July 15, 2012 by Zach*

**Math 101**

A bus traveled on a straight road for 3 h at an average speed that was 15 mph faster than its average speed on a winding road. The time spent on the winding road was 4 h. Find the average speed on the winding road if the total trip was 220 mi
*October 7, 2015 by janae*

**Math 115 # 19**

The following information shows a relationship between the speed of a certain car over a 100-mi test trip and the gas mileage obtained: Speed 40 45 50 55 60 gas millage 35 33 28 25 22 Use this information to make a line graph and then predict the gas mileage associated with a ...
*January 9, 2009 by Deb*

**maths**

1. A train was travelling at an average speed of 80km/h. If the train began a journey of 200km at 4.35pm, at what time did it reach its destination? 2. How many kilometres does a motorist travel between 11.45am and 2.00pm at an average speed of 68km/h? 3. A motorist set out on...
*February 2, 2016 by hazel*

**physics**

A trunk of mass 15 kg is on the floor. The trunk has a very small initial speed. The acceleration of gravity is 9.8 m/s2 . What constant horizontal force pushing the trunk is required to give it a velocity of 10 m/s in 20 s if the coefficient of sliding friction between the ...
*July 2, 2014 by Kailee*

**maths/probability**

q/ in a soccer match where team a has form figures of W/2 D/1 L/7 and team b has form figures of W/3 D/4 L/3 whatis the likely outcome of the match percentage wise for team a W/ L/ D/ ? if team a has form figures of W/2 D/1 L/7 and team b W/3 D4 L/3 you add team a,s wins and ...
*August 3, 2007 by james*

**Physics**

A motorcyclist who is moving along an x-axis has an acceleration given by a=(6.60-2.29t) for 0 >= t <= 6.0 s, where a is in m/s2 and t is in seconds. At t = 0, the velocity and position of the cyclist are 3.20 m/s and 7.30 m. For the time interval from 0 >= t <= 6....
*June 29, 2015 by Jessica*

**physics**

A 9.50 {\rm g} bullet has a speed of 1.40 {\rm km/s}. What is its kinetic energy in joules? What is the bullet's kinetic energy if its speed is halved? If its speed is doubled?
*April 3, 2011 by Anonymous*

**Physics**

Two electrons are fixed 2cm apart. Another electron is shot from infinity and comes to rest midway between the two fixed electrons. A)Find the energy of the system initially( unknown quantity leave as a variable) B) Find the final energy of the system?( unknown quantity leave ...
*March 28, 2012 by Eileen*

**physics**

A popular pastime is to see who can push an object closest to the edge of a table without its going off. You push the 100 g object and release it 2.90 from the table edge. Unfortunately, you push a little too hard. The object slides across, sails off the edge, falls 1.50 to ...
*October 7, 2009 by Kalen*

**Physics**

In Figure 4-44, a baseball is hit at a height h = 1.10 m and then caught at the same height. It travels alongside a wall, moving up past the top of the wall 1.1 s after it is hit and then down past the top of the wall 4.8 s later, at distance D = 47 m farther along the wall. (...
*January 21, 2011 by Blake*

**math**

Make a table to answer Problems 27–28. (3-5) Two shipping companies charge different amounts to mail packages. Company A charges an initial $5 fee, and each pound shipped is an additional $1. Company B charges an initial $3 fee, and $1.50 for each pound shipped. 27. At what ...
*November 19, 2011 by ducky*

**displacement...**

At the annual turtle races, Poindexter, the record holder, is trying to retain his title. As the race begins, Poindexter starts off racing North with a speed of 0.025 m/s. He retains this speed for 0.5 meters at which time he speeds up to 0.10 m/s. He continues at this rate ...
*October 22, 2009 by :)*

**PHYYYYYSICS 6**

Three marksmen stand at the top of a building. Two of them fire identical bullets out of identical rifles. The bullets leave the rifles with the same initial speed. The last marksman forgot his rifle, so he drops his bullet off the edge of the building from the same height as ...
*September 18, 2014 by Carissa*

**physics**

A car travels 0.90 km at an average speed of 84.8 km/h and then 0.97 km at an average speed of 41.6 km/h. What is the car's average speed during the 1.87 km interval?
*January 15, 2010 by Kim*

**Physics**

A 8.34kg lump of clay travels east on frictionless ice at a speed of 2.40 m/s. A .170 kg hockey puck travels northward and collides with the clay. After the collision, both objects stick together, and move off at a speed of 2.59 m/s in a direction of 23.9* north of east. What ...
*November 18, 2014 by Blue*

**Question!**

Beside each sport write either cardiovascular endurance, muscular endurance or flexibility. Then write whether the sport is aerobic or anaerobic in nature. a) Hockey b) Basketball c) Cross country skiing d) volleyball e) football f) soccer g) luge h) ski jumping Plz help ...
*September 20, 2006 by Zoie*

**physics**

Hi! could anyone help me to solve this problem please. Thank you. Question:An electron has a speed of 0.68 c. (a) Find the speed of a proton that has the same kinetic energy as the electron. (b) Find the speed of a proton that has the same momentum as the electron.
*May 6, 2010 by Chan*

**Physics**

An antelope has traveled 1.60 km at avg speed of 67.0 km/h. The antelope speed during the first half of the distance is 88km/h. Find the antelope's avg speed during the second half of the run.
*September 22, 2011 by JP*

**Math**

You train for A race by running at a speed of 6 mph. A) At this speed, how many minutes does it take for you to run 3.2 miles? B) on race day, you run 3.2 miles in 30 minutes. What is your speed in miles per hour?
*December 9, 2015 by Ivy*

**Statsitcs**

A roulette wheel has 38 slots, numbered 0,00,and 1 to 36. the slots 0 and 00 are colored green, 18 of the others are red and 18 are black. The dealer spins the wheel and at the same time rolls a small ball along the wheel in the opposite direction. The wheel is carefully ...
*June 10, 2015 by Lianna*

**physics**

A train whistle is heard at 280Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 270 Hz. What is the speed of the train before slowing down? What is the speed of the train after slowing down?
*January 21, 2015 by henry*

**physics**

A truck loaded with cannonball watermelons stops suddenly to avoid running over the edge of a washed-out bridge. The quick stop causes a number of melons to fly off the truck. One melon rolls over the edge with an initial speed of vi = 12.1m/s in the horizontal direction. A ...
*September 13, 2014 by awadhesh*

**College Algebra**

Use the position equation given below, where s represents the height of the object (in feet), v0 represents the initial velocity of the object (in feet per second), s0 represents the initial height of the object (in feet), and t represents the time (in seconds), as the model ...
*August 27, 2014 by Angie*

**physic**

A 1.0-kg steel ball and a 2.0-m cord of negligible mass makeup a simple pendulum that can pivot without friction about thepoint O, as in the picture below. This pendulum isreleased from rest in a horizontal position, and when the ball isat its lowest point it strikes a 1.0-kg ...
*February 27, 2011 by Anonymous*

**Physics**

A rifle with a weight of 40 N fires a 4.0 g bullet with a speed of 300 m/s. (a) Find the recoil speed of the rifle. m/s (b) If a 650 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. m/s
*November 6, 2010 by Amy*

**College 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)?. Additional: I know its a ...
*October 22, 2010 by Ryan*

**Physics**

A stone mass M thrown straight up with initial velocity V reaches a height H. A second stone of mass 2M, thrown straight up with an initial velocity 2V. What will be its height?
*December 30, 2015 by Joyce*

**Math**

During the soccer season, richard attempted 80 goals and made about 65% of them. a. How many goals did Richard make? b. The team made a total of 327 goals. What percent of the team's made goals did Richard make?
*December 18, 2014 by Gabe*

**Physics**

A steel bicycle wheel (without the rubber tire) is rotating freely with an angular speed of 18.00 rad/s. The temperature of the wheel changes from -100.0 to +300.0 degrees Celcius. No net external torque acts on the wheel, and the mass of the spokes is negligible. (a) Does the...
*February 15, 2011 by Heather*

**physics**

A 124- balloon carrying a 22- basket is descending with a constant downward velocity of 27.4 A 1.0- stone is thrown from the basket with an initial velocity of 20.0 perpendicular to the path of the descending balloon, as measured relative to a person at rest in the basket. The...
*April 1, 2012 by salem*

**grade 11 physics**

A bomber flying horizontally at 250 m/s releases a bomb 1500m above the ground. At the point of impact, what were the horizontal speed and vertical speed?
*October 17, 2010 by spencer*

**Algebra 2**

The speed of the current is 5m/h. Angie goes upstream 25 miles and returns to the doc. The whole trip takes 12 hours. What is the speed of the boat in still water?
*May 11, 2011 by Lori*

**Math**

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

**measurement**

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 journey take? b. What was his average speed in km/h c. What was his speed in ms^-1?
*May 9, 2012 by Lindsay*

**physics**

a 10kg toy mootorized boat uses 2.0 W of power, has a constant accel from rest and reaches a certain speed in 10 s on a horizontal surface. what was the final speed ?
*January 12, 2013 by teryko*

**Trigonometry **

A car with a wheel of radius 14 inches is moving with a speed of 55 mph. Find the angular speed of the automobile to the nearest mile per hour. I got 55/14
*February 12, 2013 by Joe Smith *

**Physics**

A rower whose speed of rowing is u crosses a river of width s to a point exactly opposite. Find the time of the journey if the speed of the stream is V( less than u)
*February 14, 2014 by Glory*

**Physics**

A guy riding a buffalo is chasing you at a top speed of 50 km/h, you are well ahead of the rider by 2 km, but your speed is only 20 km/h. How much time do you have to come up with a better plan?
*February 4, 2016 by sarah*

**Physic **

A quarterback (QB) is running at 3.2 m/s at an angle of 25 degrees with x axis as shown in the sketch. At the moment he's at the origin (x = y = 0) he throws the football to a receiver which is stationary located at the coordinates x = 10 meter, y = 6 meter. The total velocity...
*September 24, 2015 by elle*

**Physics**

Help me out! Thanks! You guys have really helped me before. Question 1 What does the law of inertia say about the velocity and acceleration of a body that is subject to no external influences? a) The velocity slows to zero as the object decelerates. b) The speed can change but...
*February 4, 2007 by Chris*

**Maths**

Any help with the following would be greatly appreciated. I don't understand how to use the information given to create the equation. 1) A car travels between A and B at an average speed of 60 km/h. If the car increased its average speed to 100 km/h it would take 10 minutes ...
*April 21, 2010 by Sindy*

**Physics**

A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10·10-3 m/s2 At a time of 36.0 s the speed, as given by the above ...
*January 2, 2014 by John*

**Physics**

A projectile is fired with an initial speed of 31.0 at an angle of 10.0 above the horizontal. The object hits the ground 7.50 later. a. How much higher or lower is the launch point relative to the point where the projectile hits the ground? b. To what maximum height above the ...
*October 15, 2009 by Kelcie*

**Physics**

A projectile is fired with an initial speed of 28.0 m/s at an angle of 65 degrees above the horizontal. The object hits the ground 9.5 seconds later. a) How much higher or lower is the launch point relative to the point where the projectile hits the ground? b) To what maximum ...
*October 19, 2011 by Sara*

**Maths/ Calc**

Supplies are dropped from a stationary (not moving up or down) helicopter and, after some amount of time, land on the ground with a velocity of -160 feet per second. Assumptions: Start time at t = 0 and ignore air resistance. Recall that the height function is given by y(t)= ...
*April 18, 2013 by Eliz*

**physics**

1. The ceiling of a classroom is 3.75m above the floor. A student tosses an apple vertically upward, releasing it 0.50 meters above the floor what is the maximum magnitude of the initial velocity that can be given to the apple if it is not to touch the ceiling? 2.The ...
*August 1, 2006 by Margie*

**Physics**

A 4.00g bullet, traveling horizontally with a velocity of magnitude 410m/s , is fired into a wooden block with mass of 0.780kg , initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 220m/s . The block slides a distance...
*October 15, 2014 by Stas*

**physics**

A projectile is shot from the edge of a cliff 125 m above ground level with an initial speed of 105 m/s at an angle of 37.0o with the horizontal, as shown in Figure 3-39. (a) Determine the time taken by the projectile to hit point P at ground level. (b) Determine the range X ...
*April 25, 2012 by matin*

**Physics**

A 3.2 kg block with a speed of 11 m/s collides with a 11 kg block that has a speed of 3.3 m/s in the same direction. After the collision, the 3.2 kg block is observed to be traveling in the original direction with a speed of 6.4 m/s. (a) What is the velocity of the 11 kg block...
*November 1, 2011 by Ashley*

**Physics**

(a) What is the escape speed on a spherical asteroid whose radius is 535 km and whose gravitational acceleration at the surface is 3.0 m/s2? 1 ? m/s (b) How far from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 1000 m/s? 2 ? m (c) ...
*March 21, 2011 by Steve*

**Math/ Calculus Help1**

Supplies are dropped from a stationary (not moving up or down) helicopter and, after some amount of time, land on the ground with a velocity of -160 feet per second. Assumptions: Start time at t = 0 and ignore air resistance. Recall that the height function is given by y(t)= ...
*April 16, 2013 by Martin*

**CUMULATIVE FREQUENCY**

I ALSO LOOKED AT THAT WEBSITE, AND WAS STILL CONFUSED. MY TABLE HAS A SOCCER SIGN UP TOTAL FOR 3 WEEKS. WEEK ONE HAS 9 PLAYERS, WEEK 2 HAS 13 PLAYERS, AND WEEK 3 HAS 14 PLAYERS...THE NEXT CHART SAYS TO FIND THE FREQUENCY, AND THEN CUMULATIVE FREQUENCY OF THE SIGN UP PER WEEK. ...
*September 29, 2008 by LOGAN*

**physics**

Two soccer players start from rest, 27 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.48 m/s2. The second player’s acceleration has a magnitude of 0.43 m/s2. (a) How much time passes before the ...
*September 17, 2012 by jeanette*

**physics**

Two soccer players start from rest, 41 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.55 m/s2. The second player’s acceleration has a magnitude of 0.43 m/s2. (a) How much time passes before the ...
*December 1, 2012 by Anonymous*

**physics**

Two soccer players start from rest, 33 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.58 m/s2. The second player’s acceleration has a magnitude of 0.50 m/s2. (a) How much time passes before the ...
*June 16, 2013 by louis aaaaa*

**physics**

Two soccer players start from rest, 25 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.54 m/s2. The second player’s acceleration has a magnitude of 0.40 m/s2. (a) How much time passes before the ...
*September 5, 2013 by Anonymous*

**physics**

Two soccer players start from rest, 32 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.55 m/s2. The second player’s acceleration has a magnitude of 0.40 m/s2. (a) How much time passes before the ...
*October 7, 2013 by monica*

**Physics**

Two soccer players start from rest, 30 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.49 m/s2. The second player’s acceleration has a magnitude of 0.43 m/s2. (a) How much time passes before the ...
*September 29, 2015 by Natasha*

**Physics**

A bullet moving at a speed of 154 m/s passes through a plank of wood. After passing through the plank, its speed is 149 m/s. Another bullet, of the same mass and size but moving at 91 m/s, passes through an identical plank. What will this second bullet's speed be after passing...
*January 23, 2013 by Andrew*

**Physics**

A bullet moving at a speed of 154 m/s passes through a plank of wood. After passing through the plank, its speed is 149 m/s. Another bullet, of the same mass and size but moving at 91 m/s, passes through an identical plank. What will this second bullet's speed be after passing...
*January 23, 2013 by Andrew*

**PHISIC**

A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
*December 19, 2012 by sam*

**Phar Science**

A researcher in Urumqi drops a rhodium ball of diameter 4.20 mm through a dilute aqueous solution of a high molar mass natural gum contained within a glass tube which has four graduations marked 10 cm apart. It is 18 C in the laboratory and the ball takes 1.86 seconds to fall ...
*April 5, 2011 by Sha*

**Physics URGENT!!!**

Gayle runs at a speed of 9.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 20.0 m. After she has descended a vertical distance of 4.00 m, her brother, who is initially at rest, hops on her back, and ...
*October 15, 2012 by Anonymous*

**Science - Physics**

Count the teeth in the front and rear gears in speeds 1, 5, 6 and 10 for a ten-speed bike. Record your data in the table and figure the ISA (speed advantage) and the IMA (mechanical advantage)for each speed. (The diagram shows a rear gear with 34 teeth and front gear with 52 ...
*April 16, 2009 by Cristina*

**physic**

1)a pitched ball is hit by a batter at a 45 degree angle and just clears the outfield fence,98m away. assume that the fence is at the same height as the pitch and find the velocity of the ball when it left the bat. 2)an arrow is shot at 30.0 degree above the horizontal. it ...
*November 11, 2007 by jamie*

**math 157**

A box contains three black balls and two golden balls. A ball is selected at random, it's color is recorded and it is then replaced. A second ball is selected at random, it's color is recorded it is then replaced. The outcome is associated with this type of selection is an ...
*January 9, 2010 by Rmz*

**Chemistry-Molecular models**

Select a compound and explain the advantages and disadvantages of using ball-an-stick, space-filling, and lewis structure to represent compound. What I have so far: The advantages for all the models are that you can see the shape of the atoms, but unlike the ball-and-stick and...
*July 5, 2015 by Anonymous*

**College Algebra**

Use the position equation given below, where s represents the height of the object (in feet), v0 represents the initial velocity of the object (in feet per second), s0 represents the initial height of the object (in feet), and t represents the time (in seconds), as the model ...
*July 9, 2013 by Jack*

**Physics/Chemistry**

A steel bicycle wheel (without the rubber tire) is rotating freely with an angular speed of 18.00 rad/s. The temperature of the wheel changes from -100.0 to +300.0 degrees Celcius. No net external torque acts on the wheel, and the mass of the spokes is negligible. (a) Does ...
*February 15, 2011 by Heather*

**MVT**

How do I explain this problem? A trucker handed in a ticket at a toll booth showing that in 2 h he had covered 159 mi on a toll road with speed limit 65 mph. The trucked was cited for speeding, why? I know it is mean value theorem, but how? His average speed was 159/2 = 79mph...
*November 3, 2006 by Jen*