Monday

September 26, 2016
Number of results: 36,018

**phys2**

A 2.9-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall, as shown. The initial height of the block is 0.34 m above the lowest part of the slide and the spring constant is 347 N/m...

*February 26, 2012 by opp*

**Science - Physics**

When a projectile is fired horizontally, which of the components of its motion is (A) motion at constatnt speed (B) uniformly accelerated motion (C) If the initial velocity of the projectile is increased, what effect will this have on the time it takes the projectile to fall ...

*December 6, 2006 by Nicole*

**physics**

A daredevil jumps a canyon 12 m wide . To do so , he drives a car up a 19 degree incline. a) What is the minimum speed must he achieve to clear the canyon ? b) If the daredevil jumps at this minimum speed, what will his speed be when he reaches the other side ?

*November 14, 2011 by lala mon *

**Science**

As a raindrop falls from a cloud to the surface of Earth, A.its speed increases due to gravity. B.its speed increases due to air resistance. C.t moves at a constant speed. D.>it moves at a constant velocity I think it is A. Am i right??

*February 12, 2016 by -_- . _-_*

**physics **

A man holds a 185-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force , which is applied perpendicular to the forearm. The forearm weighs 24.3 N and has a center of gravity as indicated. ...

*October 28, 2014 by S*

**Algebra**

Once again, I have some confusing problems for math. If you know any answers, even if you only know one, please tell me the answer and walk me through it so I can actually understand how you get to it. Thanks! #1: A space craft travels at a speed of 8/10 of a mile per second. ...

*November 5, 2008 by Celina*

**Intro to 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 Madison*

**physics**

A 51.5-kg skater is traveling due east at a speed of 2.70 m/s. A 69.5-kg skater is moving due south at a speed of 7.50 m/s. They collide and hold on to each other after the collision, managing to move off at an angle θ south of east, with a speed of vf. Find the following.

*January 12, 2015 by Anonymous*

**math,correction**

Problem #1 Number problem. If one-half of one integer is subtracted from three-fifths of the next consecutive integer, the difference is 3. What are the two integers? My answer is: the two integers are 24 & 25 Problem#2 Science and medicine. A passenger train can travel 325 mi...

*March 7, 2007 by jas20*

**12 data management**

3 oeople - john joan and kim throw a ball to each other. there is a probability of 1/3rd that johnwill throw it to joan. probability of 1/2 that joan wil throw it to kim. probability of 1/4th that kim will throw it to john. A. show in a Markov chain as a transition matric. B. ...

*October 8, 2008 by Linda*

**physics**

The figure shows a 0.3 kg baseball just before and just after it collides with a bat. Just before, the ball has velocity of magnitude 11.4 m/s and angle = 31.4 degrees. Just after, it is traveling directly upward with velocity of magnitude 9.00 m/s. The duration of the ...

*March 25, 2013 by Alex*

**Math**

Can you please help me with a math problem 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 ...

*January 23, 2012 by Armun*

**chem**

Butadiene can undergo the following reaction To form a dimer(two butadiene molecules hooked together). 2c4h8---->c8h12. The half life for the reaction at a given temperature is 5.92x10-2 sec. The reaction kinetics are second order. 1. If the initial concentration of c4h8 is...

*March 25, 2012 by court*

**Physics **

The space shuttle, with an initial mass M = 2.41×106 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s^2. The rate of fuel consumption is R = 6.90×103 kg/s. The shuttle reaches outer space with a velocity of vo = 4632. m/s, and a mass ...

*October 13, 2014 by bill*

**Physics**

A 14.1 μF capacitor is charged to a potential of 45.0 V and then discharged through an 80.0 Ω resistor. (a) How long after discharge begins does it take for the capacitor to lose 90.0% of the following? (i) its initial charge in seconds (ii) its initial energy in ...

*February 18, 2016 by Alyssa*

**Physics**

A beam of electrons traveling with a speed of 3.00 x 107 m/s enters a uniform, downward electric field of magnitude 1.17 x 104 N/C between the deflection plates of an oscilloscope (the figure below ). The initial velocity of the electrons is perpendicular to the field. The ...

*January 31, 2012 by Ashley *

**Physics**

A car and a truck starts from rest at the same instant, with the car initially at some distant behind the truck. The truck has a constant acceleration of 2.1 m/s^2, and the car at 3.4 m/s^2. The car overtakes the ruck after it has moved 40.0 m. a) how much time does it take ...

*December 14, 2015 by April Catubig*

**Pre calculus, vectors**

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 Halala*

**math**

If a ball is thrown directly upward with a velocity of 14 m/s, its height (in meters) after t seconds is given by y = 14t − 4.9t2. What is the maximum height attained by the ball? (Round to two decimal places.) ______ m After how many seconds is that height attained? (...

*August 14, 2014 by May*

**math**

Jimmy is travelinig at a speed of 135 mi/hr. what is his speed in feet per second?

*January 14, 2008 by Anonymous*

**Physical Science**

What is the acceleration of a car that moves from a speed of 5.0 m/s to a speed of 1 m/s during a time of 6.0s?

*March 6, 2010 by Julie*

**Physics**

How much work (in J) is done to accelerate a car which has a mass of 3300 kg from a speed of 7 m/s to a speed of 16 m/s?

*April 30, 2010 by Fallon*

**chemistry**

The speed of light in a vacuum is 2.998 108 m/s. What is its speed in each of the following units

*September 16, 2010 by john*

**physics**

The speed of sound in air at 20 degrees C is 343m/s. This corresponds to a speed of ____mi/hr.

*October 3, 2011 by Ajmber*

**dynamics**

If end A of the rope moves downward with a speed if 5 m/s, determine the speed of cylinder b

*February 3, 2012 by dave*

**physics **

A plane traveling at 260m/s has a speed of Match 0.80. What is the speed of sound in the air

*June 6, 2012 by Melissa*

**Physical Science**

You are running a race and you speed up from 3 m/s to 5 m/s in 4 seconds. a. What is your change in speed? b. What is your acceleration?

*October 12, 2013 by unknown*

**physics**

a car travel 100 km at speed of 60 km /h. Calculate the average speed of the journey.

*July 9, 2014 by manpreet sharma langiania*

**science**

What is the speed in meters per second of a boat traveling at a speed of 16.1 knots?

*September 30, 2014 by yente*

**physics**

a motorcyclist drives from a to B with a uniform speed of 30km/h find its average speed

*July 14, 2016 by sivapriya*

**Physics**

A pitcher throws a curveball that reaches the catcher in 0.55 s. The ball curves because it is spinning at an average angular velocity of 335 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it ...

*March 13, 2007 by Mary*

**physics.**

A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial acceleration of the stone, as it leaves the surface of the road is, a)vertically up b)horizontally forward c)horizontally backwards d) zero e)greater...

*December 28, 2006 by me*

**math**

Benny is traveling at a speed of 15 mi/h. What is his speed in feet per second?

*February 16, 2008 by justin black*

**Math**

Jimmy is traveling at a speed of 60 mi/h. What is his speed in feet per second?

*August 15, 2009 by Regina*

**Math**

The speed limit on a highway is 65 mi/hr. What is this speed in km/hr? Is the correct answer 104 km/hr?

*February 25, 2012 by Mandi*

**Science**

If a yo yo has a speed of 3 m/s at the top of the circle, whose radius is 80 cm, What is its speed at the bottom

*September 21, 2012 by Andtrew*

**Science**

whats the difference between average speed and instantaneous speed?

*July 4, 2015 by Emmanuel*

**College Chemistry**

For each trial, enter the amount of heat lost by the calorimeter, qcalorimeter. Be careful of the algebraic sign here and remember that the change in temperature is equal to the final temperature minus the initial temperature. Report your answer using 4 digits. Note, this is 1...

*April 12, 2013 by Jose*

**algebra**

An object that is projected straight downward with initial velocity v feet per second travels a distance s vt 16t 2 =+ , where t =time in seconds. If Ramón is standing on a balcony 84 feet above the ground and throws a penny straight down with an initial velocity of 10 feet ...

*April 24, 2013 by jj*

**algebra**

An object that is projected straight downward with initial velocity v feet per second travels a distance s vt 16t 2 =+ , where t =time in seconds. If Ramón is standing on a balcony 84 feet above the ground and throws a penny straight down with an initial velocity of 10 feet ...

*April 24, 2013 by jj*

**Geometry**

a soccer goal is 24 feet wide. point a is 40 feet in front of the center of the goal. point b is 40 feet in front of the right goal post. from which point would you have a better chance of scoring a goal?

*April 10, 2012 by Chuck*

**math**

Driver A had been leading archrival B for a while by a steady 3 miles. Only 2 miles from the finish, driver A ran out of gas and decelerated thereafter at a propertional to the square of his remaining speed. One mile later, driver A's speed was exactly halved.If driver B's ...

*February 26, 2013 by angah*

**physics**

Hi, could anyone help me please, Thank. Gas in a container is at a pressure of 1.3 atm and a volume of 1.0 m3. (a) What is the work done on the gas if it expands at constant pressure to twice its initial volume? (b) What is the work done on the gas if it is compressed at ...

*December 6, 2009 by Chan*

**physics**

Hi!could anyone help me please, Thank. Gas in a container is at a pressure of 1.3 atm and a volume of 1.0 m3. (a) What is the work done on the gas if it expands at constant pressure to twice its initial volume? (b) What is the work done on the gas if it is compressed at ...

*December 7, 2009 by Chan*

**PRE-CALC**

A drug is eliminated from the body through urine. Suppose that for an initial dose of 10 milligrams, the amount A (t) in the body t hours later is given by A(t) = 10(0.8) t a) Estimate the amount of the drug in the body 8 hours after the initial dose. b) What percent of the ...

*December 2, 2010 by Ann*

**Math**

Suppose that a wind is blowing in the direction S45°E at a speed of 50 km/h. A pilot is steering a plane in the direction N60°E at an airspeed (speed in still air) of 150 km/h. The true course, or track, of the plane is the direction of the resultant of the velocity vectors of...

*September 14, 2015 by Matthew*

**PHYSICS**

gIVE AN EXAMPL OF WHEN AVERAGE SPEED WOULD BE USED INSTEAD OF INSTANTANEOUS SPEED.

*November 15, 2008 by fahad*

**Science**

Give an example of when average speed would be used instead of instantaenous speed.

*November 15, 2008 by Joe*

**physics**

A block starts with a speed of 18.0 m/s and slides for a distance of 2.2 m down a 40° ramp (ěk = 0.43). What is its final speed? (m/s)

*November 25, 2010 by sandhu*

**physics**

At a given rotational speed, how does linear speed change as the distance from the axis changes?

*January 23, 2011 by Anonymous*

**physics**

A 0.730 kg particle has a speed of 3.00 m/s at point A and kinetic energy of 7.40 J at B. What is its speed at B? Answer in units of m/s.

*September 16, 2011 by hannah*

**physics**

a man is running on a circular track of radiur 4 m with a speed of 10ms-1.its angular speed is?

*December 6, 2011 by rida*

**Motion Skills**

you are sliding on a snow-covered hill at a speed of 8 m/s. there is a drop that incease your speed to 18 m/s in 5s?

*January 17, 2012 by Bryce *

**Physics**

A baseball is hit with a horizontal speed of 22 m/s and a vertical speed of 14 m/s upward. What are these speeds 1 s later?

*May 1, 2012 by Bob *

**college math**

the speed limit on a local highway is 65 miles per hour. what is this speed in km/hr

*June 19, 2012 by Lourane*

**Math**

A wheel has a 32 inch diameter. The speed of a point on its rim is 44 ft/sec. What is its angular speed?

*February 26, 2013 by Sarah*

**math**

A rikhshaw covered 2 km/hr and return back at a speed of 11 km/hr find the average speed of the rickshaw

*May 4, 2014 by jatin*

**Chemistry**

A bumblebee flies with a ground speed of 15.2 m/s. Calculate its speed in miles per hour.

*February 9, 2015 by Aerial *

**Deogiri**

If the speed of train is 150 miles per hour; then express its speed in si unit

*July 24, 2015 by Bhavesh*

**Physics **

A 100 grams of bullet is fired from a 10 kg with a speed of 1000 m/s. What is the speed of the recoil of the gun?

*October 21, 2015 by Anonymous *

** Physics **

The speed limit on a nearby road is 25 mph what is the speed and meters per second

*September 6, 2016 by Joshu*

**childcare**

a child who moved from throwing a ball using only an elbow movement to throwing a ball using her elbow,wrist and shoulder is showing signs of development (a) a. intertask b. spatial c. joint plate d. intratask 2. a teacher requests that a child use a hmall stepladder to reach ...

*August 6, 2010 by action*

**English**

1.Drink a lot of water at a time is not good for your health. You need to drink abut five bottles of 2 liter clean water by taking time. 2. He is wearing a soccer uniform. There is Number 9 on his left chest of his clothing. 3. Skipping breakfast is not good for your health. ...

*June 18, 2010 by rfvv*

**chemistry**

Gaseous CO2 decomposes to form the gaes CO and O2. At 20.0 degrees Celsius, =2.0*10^-8. 2.0 mol carbon dioxide is placed in a 5.0 L flask. What are the equilibrium concentrations of each species. My attempt to get the answer: Balanced equation: 2CO2--> 2CO+O2 To get the ...

*March 1, 2009 by Anonymous*

**CALCULUS**

Using separation of variables technique, solve the following differential equation with initial condition dy/dx = (yx + 5x) / (x^2 + 1) and y(3) = 5. The solution is: a.) y^2 = ln(x^2 + 1) + 25 - ln10 b.) ln(abs(y+5)) = ln(x^2 + 1) c.) ln(abs(y+5)) = arctan3 + ln10 - arctan3 d...

*May 26, 2012 by Anonymous*

**Chemistry**

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

*February 15, 2013 by AhmadM*

**math**

Hello! I would be really grateful if you could help me with this word problem. Here is the problem: In a cartoon, a malfunctioning cannon fires a hungry coyote towards the bottom of a cliff with an initial rate of 100 feet per second. If the cliff is 1250 feet tall, how long ...

*March 6, 2013 by Beth*

**Chemistry - Solution Stoichiometry**

A piece of nickel is placed in a beaker with 350 mL of copper (II) sulfate. Calculate the concentration of the copper (II) sulfate solution. Initial mass of nickel - 15.5 g Final mass of nickel - 11.4 g What do i do with the final and initial masses of nickel?

*April 2, 2008 by Michelle*

**physics**

A string under a tension of 43.0 N is used to whirl a rock in a horizontal circle of radius 2.45 m at a speed of 20.9 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string is 1.00 m long and the...

*March 12, 2013 by john*

**Physics please help ASAP!**

If you know the mass of a star and a planet’s radius and speed at perihelion (closest approach to the star), then using conservation of energy and angular momentum you can solve for the radius and speed of that planet at aphelion (farthest point from the star). Encke’s comet ...

*March 31, 2014 by Bobby*

**Physics**

Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 36.3 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun...

*September 4, 2014 by Hoku*

**Physics**

Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 27.3 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun...

*February 7, 2015 by Kaleem*

**physics **

Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 44.7 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun...

*August 6, 2015 by sarah*

**Physics**

Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? (b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s? I tried to use ...

*March 10, 2010 by Kelsey*

**physics**

a race car completes 10 laps around an oval track. which of the following pairs of quantities concerning its motion would both have values of zero? a)displacement, avg velocity B)avg speed, avg acceleration c)distance, avg speed d)avg speed, avg velocity e) displacement, avg ...

*September 14, 2009 by kaaay*

**URGENT**

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= 37 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 5, 2013 by kyle*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 5, 2013 by sonia*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 5, 2013 by kyle*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 5, 2013 by anon*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 5, 2013 by HELP!!!!*

**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= 45 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by kyle(PLS HELP )*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by anon*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by anon*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by HELP(ANS PLS!!!!!!!!)*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by URGENT(could some one pls give me the answer*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by URGENT(could some one pls give me the answer*

**physics(help)**

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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by physics(help)*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by PHYSICS*

**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= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...

*October 6, 2013 by PHYSICS*

**physics**

A person walks first at a constant speed of 4.90 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 2.70 m/s. (a) What is her average speed over the entire trip?

*August 31, 2010 by mattie*

**physics**

A person walks first at a constant speed of 4.90 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 2.70 m/s. (a) What is her average speed over the entire trip?

*August 31, 2010 by mattie*

**Physics**

A sprinter crosses the finish line of a race. The roar of the crowd in front approaches her at a speed of 357m/s . The roar from the crowd behind her approaches at 341m/s . A) What is the speed of the sound? B) What is the sprinter's speed?

*April 12, 2015 by Anonymous*

**Physics**

We're studying projectile motion in my Physics class right now, and last week we went outside and hit tennis balls with a bat. Now we must make graphs showing the position of the ball in both the x and y directions. I must also explain why each line has the shape that it does...

*November 11, 2007 by Lindsay*

**physics**

An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.35 m/s on a smooth, slippery surface. The 22.5 g arrow is shot with a speed of 41.0 m/s and passes through the target, which is stopped by the impact. What is the speed of the ...

*July 7, 2008 by Elisa*

**physics**

An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.35 m/s on a smooth, slippery surface. The 22.5 g arrow is shot with a speed of 41.0 m/s and passes through the target, which is stopped by the impact. What is the speed of the ...

*July 6, 2008 by Elisa*

**physics**

An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.15 m/s on a smooth, slippery surface. The 22.5 g arrow is shot with a speed of 38.0 m/s and passes through the target, which is stopped by the impact. What is the speed of the ...

*March 28, 2011 by Alexandria*

**physics**

An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.45 m/s on a smooth, slippery surface. The 22.5 g arrow is shot with a speed of 40.5 m/s and passes through the target, which is stopped by the impact. What is the speed of the ...

*November 28, 2012 by Anonymous*

**English**

Which quote from "The Morning of June 28, 1948" bes supports the conclusion that the public strongly disliked "The Lottery?" A. "this, as any writer of stories can tell you, is not a usual thing." B. "your story has kicked up quite a fuss around the office." C. "later that day...

*May 18, 2015 by angie*

**chemistry**

In a reaction involving the bromination of acetone, the following initial concentraions were present in the reaction mixture. acetone (0.8mol/L), H+ (0.2 mol/L), Br2 (0.004 mol/L) At 25 degrees C, it took 240s before the colour of Br2 disappeared. If the reaction is zero order...

*February 27, 2011 by Mal*

**physics**

A small ball is set in horizontal motion by rolling it with a speed of 3.00 m/s across a room 12.0m long, between two walls. Assume that the collisions made with each wall are perfectly elastic and that the motion is perpendicular to the two walls. (a)Show that the motion is ...

*March 15, 2007 by sam*