Sunday

April 20, 2014

April 20, 2014

Number of results: 52,180

**physics**

A 20 kg cannonball is fired from a 2.4 x 103 kg. If the cannon recoils with a velocity of 3.5 m/s backwards, what is the velocity of the cannonball?
*Wednesday, November 23, 2011 at 4:14pm by Ula*

**Physics**

During a circus performance, a 77-kg human cannonball is shot out of an 20-m-long cannon. If the human cannonball spends 0.91 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
*Friday, February 22, 2013 at 8:25pm by Ronnica*

**physics**

You are a Middle Ages cannonball scientist attacking a castle a distance D away. Your job is to get a cannonball of mass m over the walls, which are a height H above the top of the cannonball launcher. At the instant when the cannonball leaves the launcher it will be traveling...
*Sunday, January 26, 2014 at 6:05pm by Henry*

**MATH**

The height h (in meters) of a cannonball t seconds after it is fired into the air is given by h=-4t^2+16t+9. a) What is the initial height of the cannonball? What feature does this correspond to on the graph? b) Find the height of the cannonball after 1 second. c) What is the ...
*Saturday, March 8, 2014 at 1:40pm by Josh*

**physics**

A cannonball is shot from a cannon on a cliff at a height of 18.9 m at a ship on the ocean. The cannonball is shot with an initial velocity of 15.1 m/s at an angle of 24.7 degrees above the horizontal. #1- What is the total maximum height of the cannonball (the height with ...
*Tuesday, November 24, 2009 at 1:25am by veronica*

**Physics **

A cannon fires a free projectile at an angle 85 from the ground. The cannonball has a speed of 150 m/s and it is launched from a hill 20 m above the plain where it will land 1. What is the x component of the cannonballs initial velocity 2. What is the y component of the ...
*Monday, February 17, 2014 at 2:43pm by Michelle*

**Physics**

A cannon fires a free projectile at an angle 85 from the ground. The cannonball has a speed of 150 m/s and it is launched from a hill 20 m above the plain where it will land 1. What is the x component of the cannonballs initial velocity 2. What is the y component of the ...
*Wednesday, February 19, 2014 at 8:56pm by Michelle*

**physics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 38.0 m/s and an initial vertical velocity of 26.0 m/s. 1) What is the initial speed of the cannonball? 2) What is the initial angle θ of the cannonball with respect to the ground? 3) What is ...
*Wednesday, August 29, 2012 at 6:40pm by Dante*

**pyhsics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 36.0 m/s and an initial vertical velocity of 21.0 m/s. 1) What is the initial speed of the cannonball? 2) What is the initial angle θ of the cannonball with respect to the ground? 3) What is ...
*Saturday, September 8, 2012 at 2:40pm by ali*

**physics3**

A cannonball is catapulted toward a castle. The cannonball's velocity when it leaves the catapult is 39 m/s at an angle of 40° with respect to the horizontal and the cannonball is 7.0 m above the ground at this time. (a) What is the maximum height above the ground reached by ...
*Thursday, February 16, 2012 at 3:51pm by Anonymous*

**Physics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 38.0 m/s and an initial vertical velocity of 26.0 m/s. The initial speed of the cannonball 46.04 m/s The initial angle θ of the cannonball with respect to the ground 34.38° What is the maximum...
*Tuesday, September 11, 2012 at 10:09pm by Kayla*

**Physics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 38.0 m/s and an initial vertical velocity of 26.0 m/s. The initial speed of the cannonball 46.04 m/s The initial angle θ of the cannonball with respect to the ground 34.38° What is the maximum...
*Tuesday, September 11, 2012 at 10:12pm by Kayla*

**Physics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 38.0 m/s and an initial vertical velocity of 26.0 m/s. The initial speed of the cannonball 46.04 m/s The initial angle θ of the cannonball with respect to the ground 34.38° What is the maximum...
*Tuesday, September 11, 2012 at 10:16pm by Kayla*

**Physics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 38.0 m/s and an initial vertical velocity of 26.0 m/s. The initial speed of the cannonball 46.04 m/s The initial angle θ of the cannonball with respect to the ground 34.38° What is the maximum...
*Tuesday, September 11, 2012 at 10:16pm by Kayla*

**Physics **

A cannon launches a ball with the initial speed of 210 m/s at a 70 degree angle. 1. How high will the cannonball go? 2. If the cannonball has a mass of 25kg how much work does it take to launch the cannonball to that height?
*Friday, April 11, 2014 at 3:06pm by Michelle*

**Physical Science**

A stationary but moveable 450-kg cannon is fired and the 12-kg cannonball moves off to the right with a velocity of 20.0 m/s. What is the connon's velocity (both magnitude and direction) due to the kickback from the firing?
*Saturday, February 26, 2011 at 8:11pm by Tina*

**Physics**

In a fit of pique, the Canadians fire a cannonball due south from vancouver (lat 49.2 degrees N) at a randomly picked city (39.4 degrees N). Assuming the cannonball takes 48 minutes to get there, by how far and in what direction will the cannonball miss?
*Friday, March 5, 2010 at 9:19am by Krysten*

**Physics**

In a fit of pique, the Canadians fire a cannonball due south from vancouver (lat 49.2 degrees N) at a randomly picked city (39.4 degrees N). Assuming the cannonball takes 48 minutes to get there, by how far and in what direction will the cannonball miss?
*Tuesday, March 16, 2010 at 11:06pm by Krysten*

**Physics**

During a circus performance, a 75-kg human cannonball is shot out of an 19-m-long cannon. If the human cannonball spends 0.94 s in the cannon, determine the average net force exerted on him in the barrel of the cannon
*Wednesday, September 29, 2010 at 6:18pm by Xavier*

**Physics**

During a circus performance, a 75-kg human cannonball is shot out of an 19-m-long cannon. If the human cannonball spends 0.94 s in the cannon, determine the average net force exerted on him in the barrel of the cannon
*Sunday, October 3, 2010 at 4:09pm by Jibri*

**Physics!!**

During a circus performance, a 73.1-kg human cannonball is shot out of a 19.5-m-long cannon. If the human cannonball spends 0.921 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
*Wednesday, February 2, 2011 at 8:08pm by Tiffany*

**physics**

During a circus performance, a 67.2-kg human cannonball is shot out of a 17.1-m-long cannon. If the human cannonball spends 0.772 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
*Wednesday, February 23, 2011 at 6:28pm by heather*

**physics **

During a circus performance, a 74.8-kg human cannonball is shot out of a 18.0-m-long cannon. If the human cannonball spends 0.844 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
*Wednesday, February 1, 2012 at 10:57pm by Erin*

**Physics**

During a circus performance, a 64-kg human cannonball is shot out of an 17-m-long cannon. If the human cannonball spends 0.99 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
*Wednesday, October 3, 2012 at 12:36pm by Anonymous*

**Physics**

During a circus performance, a 64-kg human cannonball is shot out of an 17-m-long cannon. If the human cannonball spends 0.99 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
*Wednesday, October 3, 2012 at 10:45pm by Donald*

**Physics **

A cannon shoots a cannonball with an initial speed of 25 m/s at an angle 13. 1. What is the x component of the cannonballs initial velocity Vox? 2. What is the y component of the cannonballs initial velocity Voy? 3. What will be Vy, the y component of the cannonballs final ...
*Monday, February 17, 2014 at 2:34pm by Michelle*

**Physics**

A cannon shoots a cannonball with an initial speed of 25 m/s at an angle 13. 1. What is the x component of the cannonballs initial velocity Vox? 2. What is the y component of the cannonballs initial velocity Voy? 3. What will be Vy, the y component of the cannonballs final ...
*Wednesday, February 19, 2014 at 8:57pm by Michelle*

**physics**

A cannonball of mass 3.67 kg is shot from a cannon at an angle of 39.51° relative to the horizontal and with an initial speed of 56.41 m/s. As the cannonball reaches the highest point of its trajectory, what is the gain in its potential energy relative to the point from which ...
*Sunday, February 20, 2011 at 7:57pm by lizzy*

**physics**

A cannonball of mass 6.09 kg is shot from a cannon at an angle of 47.18° relative to the horizontal and with an initial speed of 48.90 m/s. As the cannonball reaches the highest point of its trajectory, what is the gain in its potential energy relative to the point from which ...
*Saturday, June 9, 2012 at 3:15pm by lanre*

**College Physics**

A cannonball of mass 3.67 kg is shot from a cannon at an angle of 39.51° relative to the horizontal and with an initial speed of 56.41 m/s. As the cannonball reaches the highest point of its trajectory, what is the gain in its potential energy relative to the point from which ...
*Sunday, February 20, 2011 at 6:35pm by Emma*

**Physics 111**

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 48 m/s and at an angle of 29°. A cannonball that was accidentally dropped hits the moat below in 1.7 s. (a) How far from the castle wall does the cannonball hit the ground?
*Sunday, September 19, 2010 at 10:36pm by Anonymous*

**physics**

When a cannon fires a cannonball, the cannon will recoil backward because the a) energy of the cannonball and the cannon is conserved b) momentum of the cannonball and cannon is conserved c)energy of the cannon is greater than the energy of the cannonball d) momentum of the ...
*Wednesday, October 24, 2007 at 3:16pm by Tammy*

**physics**

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 54 m/s and at an angle of 34°. A cannonball that was accidentally dropped hits the moat below in 1.1 s.(a) (a)How far from the castle wall does the cannonball hit the ...
*Sunday, June 19, 2011 at 5:44pm by kate*

**physics**

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 42 m/s and at an angle of 33°. A cannonball that was accidentally dropped hits the moat below in 1.6 s. (a) How far from the castle wall does the cannonball hit the ...
*Monday, March 5, 2012 at 11:14am by Haley*

**Physics**

I have a sheet full of equations, I just don't know which one to use or what type of problem this is. A cannon is on a hill. The hill is 20 m high. The cannon is at an angle of 26 degress. If a cannonball is shot into the valley below. a.) Find the x and y components of ...
*Monday, February 8, 2010 at 7:01pm by Jill*

**Physics**

The cannonball is fired at a speed of 45 and an angle of 35 . A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.8 .
*Saturday, April 20, 2013 at 12:58am by jeff*

**physics**

a pirate ship fires a 25kg cannonball with a velocity of +100m/s at a very heavy fur trader ship. the ship is at rest. the cannonball bounces off the side of the ship, making a hole. after the collision the cannonball has a velocity of -0.5m/s. assume the water did not absorb ...
*Monday, February 28, 2011 at 4:42pm by Allison*

**math**

Mighty Mouse (who flies at a constant speed of 600mph) was standing by a cannon that was pointed straight up. A cannonball was shot vertically into the air with an initial velocity of 300 mph. Exactly one second after the cannon was fired, Mighty Mouse flew up to touch the ...
*Wednesday, April 24, 2013 at 12:27pm by bern*

**Physics**

A cannonball is fired with a velocity of 200 m/s at an angle of 25 degrees above the ground. After the total flight of 45.6 seconds, the cannonball returns to the ground. Calculate: the initial horizontal and vertical components of the velocity, the maximum height of the ...
*Tuesday, October 23, 2012 at 11:05pm by Anne*

**Physics**

a cannon with a barrel velocity of 140 m/s launches a cannonball horizontally from a tower. neglecting air resistance how far vertically will the cannonball have fallen after 4 seconds?
*Thursday, September 26, 2013 at 5:03pm by Anonymous*

**Physics**

a cannon with a barrel velocity of 140 m/s launches a cannonball horizontally from a tower. neglecting air resistance how far vertically will the cannonball have fallen after 4 seconds?
*Thursday, September 26, 2013 at 5:08pm by Anonymous*

**11th grade-physics**

a cannon with a mass of 1,500kg fired a 7kg cannonball along its 3m long barrel in 0.015 seconds a)calculate the acceleration of the cannonball b)the force acting on the cannonball c) the reaction force exerted on the cannon d)the acceleration of the cannon e) the distance the...
*Sunday, March 28, 2010 at 2:43pm by Bill Williams*

**Math**

Mighty Mouse (who flies at a constant speed of 1400 ft/sec) was standing next to a cannon that was pointed straight up. A cannonball was shot vertically into the air with an initial velocity of 880 ft/sec. Exactly one second after the cannon was fired, Might Mouse flew up to ...
*Monday, December 10, 2012 at 9:23am by Jeremie*

**Phsyics **

A cannonball is fired into the air with a speed of 42 m/s from a height of 28 m, with what speed does the cannonball hit the ground?
*Monday, April 16, 2012 at 9:04pm by Kelly *

**Physics Honors**

A cannon fires a cannonball 500 m downrange when sest at a 45° angle. At what velocity does the cannonball leave the cannon?
*Friday, December 2, 2011 at 12:23am by Jacqueline*

**physics**

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 45 and an angle of 28 above horizontal. A cannonball that was accidentally dropped hits the moat below in 1.6 .
*Tuesday, September 21, 2010 at 11:58am by chris*

**Science**

If a ship is sailing with a constant speed of 30 m/s to the east and a cannonball is launched straight up into the air from the deck of the ship, why does the cannonball land back in the cannon and not in the ocean behind?
*Wednesday, February 10, 2010 at 2:30pm by Lanell*

**physics**

Use the dropped cannonball's fall time (1.6 s) to compute the height of the top of the castle. H = (g/2)t^2 = 12.54 m (a) In this case, assume they are talking about the fired cannonball, not the dropped one. Solve this equation for time of flight t: H = 12.54 -(g/2)t^2 + ...
*Monday, March 5, 2012 at 11:14am by drwls*

**Physics**

A revolutionary cannon, with a mass of 2000kg, fires a 20kg ball horizontally. The cannonball has a speed of 140m/s after it has left the barrel. The cannon carriage is on a flat platform and is free to roll horizontally. What is the speed of the cannon immediately after it ...
*Monday, September 18, 2006 at 8:17pm by puff puff*

**Math**

2.20 pounds/kg for example 50 kg ( 2.20 lb/kg) = 110 lb or 150 lb (1 kg/2.20 lb) = 68.2 kg
*Sunday, November 30, 2008 at 3:24pm by Damon*

**physics**

A cannonball is shot (from ground level) with an initial horizontal velocity of 33.0 m/s and an initial vertical velocity of 25.0 m/s. What is the initial speed of the cannonball?
*Monday, September 10, 2012 at 8:00pm by Max*

**math**

The path of a cannonball is a parabola modeled by the equation y= 55 + x - 0.002x^2, where x and y are both measured in feet. In this model, the cannonball starts at the point (0,55) and travels to the right. The ground is represented by the x-axis. Determine the horizontal ...
*Wednesday, October 30, 2013 at 1:35am by Lily*

**physics**

When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)
*Saturday, April 27, 2013 at 3:21pm by Chris*

**Physics**

When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)
*Sunday, September 22, 2013 at 10:26pm by Miss Angie*

**Physics**

Multiple choice please help. How much kinetic energy does a 1 kg ball have if it has a velocity of 10 m/s? a. 100 J. b. 50 J. c. 10 J. d. 5 J. The airbag in a car works in a collision by . . . a. increasing the time of the impact to the person. b. reducing the impulse to the ...
*Thursday, October 20, 2011 at 12:07am by Lisa*

**chemistry**

39C*(9/5)+32 = degrees F. Approximately 102. Convert 44 lb to kg. There are 453.6 g in 1 pound and 1000 g in a kg. You should end up with approximately 20 kg. Then 20 kg x (30 mg/kg) = approximately 600 mg/day and divide that by 2 for the single dose.
*Wednesday, June 15, 2011 at 10:10pm by DrBob222*

**Introduction to Physical Science**

When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)
*Sunday, August 4, 2013 at 6:25pm by Jason*

**physics**

there is no air resistance. using a cannonball launcher, how can i find how far the cannonball will go (horizontally) if launched at 30 degrees? heres what i know: -the vertical displacement is -.245m -the vertical acceleration is -9.81m/s^2 -at 0 degrees, the initial velocity...
*Tuesday, September 8, 2009 at 9:00pm by jawn*

**Physics**

Why does a cannonball shot from a cannon with a long barrel travel faster than the same cannonball shot from a cannon with a shorter barrel?
*Tuesday, November 15, 2011 at 8:23pm by Shari*

**Physics**

a) A cannonball is fired horizontally from the top of a cliff. The cannon is at height H = 100 m above ground level, and the ball is fired with initial horizontal speed v_0. Assume acceleration due to gravity to be g = 9.80 m/s^2. Assume that the cannon is fired at time t = 0 ...
*Friday, September 26, 2008 at 8:59pm by Sam*

**Physics**

When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?) Please help; need a ...
*Thursday, April 25, 2013 at 3:51pm by Chris*

**Science**

A revolutionary war cannon, with a mass of 2170 kg, fires a 18.1 kg ball horizontally. The cannonball has a speed of 146 m/s after it has left the barrel. The cannon carriage is on a flat platform and is free to roll horizontally. What is the speed of the cannon immedi- ately ...
*Monday, October 18, 2010 at 11:03pm by Cole*

**Algebra 1**

44 lbs * (1 kg /2.2 lb) = 20 kg 20 kg * (5 mg/kg) = 100 mg
*Thursday, March 6, 2014 at 10:24am by Damon*

**Chemistry**

(C*9/5)+32 = F 44 lbs x (2.2 kg/lb) = 20 kg. 30 mg/kg = 30 mg x 20 kg = 600 mg daily Divide that into two doses.
*Sunday, August 7, 2011 at 12:55pm by DrBob222*

**Physics**

Two packing crates of masses m1 = 10.0 kg and m2 = 3.20 kg are connected by a light string that passes over a frictionless pulley as in the figure. The 3.20-kg crate lies on a smooth incline of angle 44.0°.
*Friday, October 5, 2012 at 12:52am by Utsa*

**physics**

Two identical cannons fire cannonballs horizontally with the same initial velocity. One cannon is located on a platform partway up a tower, and the other is on top, four times higher than the first cannon. How much farther from the tower does the cannonball from the higher ...
*Friday, June 15, 2012 at 7:48pm by daniel*

**Physics **

You are general in the Napoleonic wars. You are on top of a plain 12m talk and you have a cannon tht can shoot a cannonball out at 350 m/s. 800 m away is a thick forest that you cannot see into but one of your scouts in a hot air balloon has just signaled to you that an enemy ...
*Wednesday, February 19, 2014 at 9:42pm by Michelle*

**Physics**

You are general in the Napoleonic wars. You are on top of a plain 12m talk and you have a cannon tht can shoot a cannonball out at 350 m/s. 800 m away is a thick forest that you cannot see into but one of your scouts in a hot air balloon has just signaled to you that an enemy ...
*Saturday, February 22, 2014 at 4:29pm by Michelle*

**physics**

You need to specify how far the cannon is from the wall. The answer will depend upon it. There is a vertical velocity component of Vyo = 35 sin 60 = 25.98 m/s. The cannonball can rise to a height H = (V sin 60)^2/(2g) = 34.4 m Surely the cannonball will clear the wall if the ...
*Monday, October 18, 2010 at 12:02am by drwls*

**physics.**

A 20.0 kg cannon ball is fired from a cannnon with muzzle speed of 1000 m/s at an angle of 37.0 with the horizontal. A second ball is fired at an angle of 90.0. Use the conservation of energy principle to find a] the maximum height reached by each ball and b] the total ...
*Thursday, March 15, 2007 at 5:38am by Jean*

**Math**

(a) to get this, we just use ratio and proportion: let x = weight of 150 books. 108 books : 30 kg = 150 books : x kg we can thus rewrite this as 108/30 = 150/x 3.6 = 150/x x = 150/3.6 x = 41.67 kg (b) we also use ratio and proportion here: let y = number of books that has ...
*Sunday, May 15, 2011 at 4:22am by Jai*

**physics**

A human cannonball is launched from a cannon at 26.4 m/s at 20.4 degrees above the horizontal. (Assume he/she lands in a net the same height as the cannon.) How high in the air does he/she go?
*Thursday, May 16, 2013 at 7:48pm by John*

**math**

1 lb = 0.45359237 kg 20 lb = 20 * 0.45359237 = 9.0718474 kg 20 lb = 9.1 kg rounded to the nearest tenth Remak : lb = pound
*Sunday, February 23, 2014 at 12:22am by Bosnian*

**Physics**

A 20.0 kg block is connected to a 30.0 kg block by a string that passes over a light, frictionless pulley. The 30.0 kg block is connected to a spring that has negligible mass and a force constant of 200 N/m. The spring is unstretched when the 30.0 kg block is 20.0 cm above the...
*Tuesday, March 3, 2009 at 11:05am by mightymouse*

**irsc**

a 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. if the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?
*Wednesday, March 26, 2014 at 8:28pm by Anonymous*

**Chemistry**

Isn't there a law some where called the law of conservation of energy; energy may not be created nor destroyed. So if you could mix 20 kg oxygen and 20 kg wood (40 kg total) and convert it to its products, what does that law tell you.
*Wednesday, February 18, 2009 at 9:44pm by DrBob222*

**physics**

A 20.0 kg block is connected to a 30.0 kg block by a string that passes over a light, frictionless pulley. The 30.0 kg block is connected to a spring that has negligible mass and a force constant of 300 N/m, as shown in the figure below. The spring is unstretched when the ...
*Monday, November 14, 2011 at 2:49pm by carlton*

**ph**

A 20.0 kg block is connected to a 30.0 kg block by a string that passes over a light, frictionless pulley. The 30.0 kg block is connected to a spring that has negligible mass and a force constant of 300 N/m, as shown in the figure below. The spring is unstretched when the ...
*Monday, November 14, 2011 at 2:49pm by carlton*

**science**

How to find the magnitude and direction of acceleration given the force and mass which are: F= 5.0 N , 20 N M= 3.0 kg How to draw the diagram for this problem? 5.0N ← 3.0 kg → 20 N
*Wednesday, August 19, 2009 at 2:56am by Amberina*

**maths**

zinc = 3x kg, copper = 17x kg, 3x + 17x = 4.0 kg, 20x = 4, x = 4 / 20 = 0.20, 3x = 3 * 0.20 = 0.6 kg = zinc required.
*Tuesday, November 9, 2010 at 11:31am by Henry*

**physics**

Vb = 0.7 * 20^3 = 5600 cm^3. = Vol. below surface. Vb = (Dc/Dw) * Vc. = 5600 (Dc/1) * 20^3 = 5600 Dc = 5600/20^3 = g/0.7 cm^3 = Density of the cube of wood. 1. Mass of cube = 20^3cm^3 * 0.7g/cm^3= 5600 Grams. = 5.6 kg. To totally submerge the block, its' density must be ...
*Saturday, June 1, 2013 at 10:49am by Henry *

**Physics _ Please help**

25 kg of ice at 0° C is combined with 4 kg of steam at 100° C. What is the final equilibrium temperature in ° C of the system? (Lf = 3.33 x 105 J/kg; Lv 2.26 x 106 J/kg, specific heat capacity of water =4186 J/(kg.K)) Question 2 options: A) 40 B) 20 C) 60 D) 100 E) 8
*Friday, August 12, 2011 at 10:45am by Maya*

**Oceanography**

On a sunny day in an estuary, the surface irradiance is 1.6*10^17 photons cm^-2 s^-1. What is k if the irradiance is 7.3*10^13 photons cm^-1 s^-1 at 16 m depth? At a spot in the ocean, the surface irradiance is 7.8*10^16 photons and k=.14 m^-1. At what depth does the euphotic ...
*Friday, March 5, 2010 at 6:06am by Krysten*

**science**

a car with a mass of 2000 kg moves along the ice with a constant velocity of 10.0 m/s. What is the car's momentum? a. 200.0 N b. 20.000 N c. 200.0 kg x m/s d. 20,000 kg x m/s I know it is twenty thousand, I'm unsure of the measurements or units. Please explain.
*Wednesday, September 21, 2011 at 6:42pm by kenny*

**physics**

horseshoe m1 = 0.43 kg water m2 = 1.6•10^-3•1000 = 1.6 kg iron pot m3 = 0.26 kg specific heats water = 4186 J/kg•C iron = 450 J/kg•C 1.6• 4186• (26 - 20) + 0.25• 450•(26 - 20) = 0.43•450•(t- 26) t = 237 oC
*Monday, April 23, 2012 at 2:35pm by Elena*

**Math**

well, I am going to do this the hard way based on my answer to the last question. You know now about 2.20 lbs/ kg I also know 16 oz/lb I also know 1000 g/kg so say I have 550 g and want oz 550 g (1 kg/1000g)(2.20 lb/kg)(16 oz/lb) g cancels kg cancels lb cancels and I am left ...
*Sunday, November 30, 2008 at 3:25pm by Damon*

**Physics!**

m1=20 kg, a=3 m, I1 =m•a²/6 = 20•9/6 =30 kg•m² m2 =0.6 kg , b =a•√2/2=3•√2/2 =2.13 m. I2 =mb²=0.6•2.13²= 2.7 kg•m² m3 = 0.8 kg, c=a/2 =1.5 m. I3=mc²=0.8• 1.5² =1.8 kg•m². I =I1+4•I2+4•I3 = 30+4•(2.7+1.8) =48 kg•m².
*Saturday, June 9, 2012 at 11:31am by Elena*

**Mathematics**

Let the amount of the $2.50 coffee be x kg then the amount of the $3.50 coffee will be 20-x kg 2.5x + 3.5(20-x) = 2.8(20) = 56 times 10 25x + 35x(20-x) = 560 25x + 700 - 35x = 560 -10x = -140 x = 14 He should mix 14 kg of the $2.50 and 6 kr of the $3.50 coffee.
*Sunday, January 15, 2012 at 9:30am by Reiny*

**math**

Number of kg of 45% alum .... x number of kg of 70% alum .... 20-x solve for x .45x + .70(20-x) = .60(20) (I suggest multiplying each of the 3 term by 100 first)
*Monday, July 5, 2010 at 11:59pm by Reiny*

**physics**

The following objects are released from rest and allowed to roll down an inclined plane. Rank the objects by the order of which they will arrive at the bottom of the incline. (1 = the first to arrive, 2 = the second, etc.) I = 2611 kg*m^2, M = 50 kg, R = 0.8 m I = 2883 kg*m^2...
*Friday, March 16, 2012 at 10:31pm by Katie*

**algebra 2**

A cannonball is launched from a cannon on a wall. If the path is traced on piece of paper so that the cannon is situated on the y axis, the equation of the path is y= -1/600x^2 + 1/2x + 20. How high above the ground is the cannon.
*Monday, March 22, 2010 at 12:32pm by DEE*

**science**

Which of the following would require more energy to heat it from 10°C to 20°C? a. 200 kg of water b. 200 kg of aluminum c. 100 kg of steel How much heat energy is required to raise the temperature of 20 kilograms of water from 0°C to 35°C?
*Thursday, February 7, 2013 at 4:23pm by edwin*

**CHEMISTRY**

OK. Am I embarrassed. Big time. 20% Zn means 20 g Zn/100 g soln or 20 g Zn/(20g Zn+ 80g Cu). molality = moles/kg SOLVENT (not soln). 20 g is 0.306 moles and that in 0.08 kg Cu(as the solvent) = 3.82m Perhaps I had better look at the molarity one also.
*Thursday, October 14, 2010 at 11:10pm by DrBob222*

**Physics**

Multiple choice. The airbag in a car works in a collision by . . . a. increasing the time of the impact to the person. b. reducing the impulse to the person. c. reducing the momentum of the person. d. increasing the force on the person. A cannonball shot from a cannon with a ...
*Wednesday, October 19, 2011 at 8:00pm by Lisa*

**Physics**

A 5 kg block is placed on top of a 10 kg block as shown above. A horizontal force of 45 N is applied to the 10 kg block, while the 5 kg block is tied to the wall. The coefficient of kinetic friction between the moving surfaces is 0.20. Determine (a) the tension in the string ...
*Sunday, February 23, 2014 at 2:39am by Chrxeyshthoufov*

**science**

well, since F = ma it is kg•m/s^2 so, kg•m/s^2 = G•kg•kg/m^2 G = kg•m/s^2 * m^2/kg•kg = m^3/kg•s^2 #5 Which you could also have easily looked up online...
*Saturday, August 31, 2013 at 8:21pm by Steve*

**PHYSICS!?!@@!**

A 2.00-kg sphere is rotating about an axis through its center at 40.0 rev/s with the angular velocity in the +z direction. A torque 10.0 Nm acts on the sphere about the center of the sphere in the +x direction. What is the rate of change of the angular momentum of the sphere? ...
*Tuesday, November 13, 2012 at 8:02pm by Elyse*

**Physics**

A 0.30 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.20 kg puck that is initially moving along the x axis with a velocity of 2.8 m/s. After the collision, the 0.20 kg puck has a speed of 0.5 m/s at an angle of θ = 53° to the positive x ...
*Sunday, October 23, 2011 at 10:39pm by Seth*

**physic**

A 1.20-{\rm kg} block of wood sits at the edge of a table, 0.720 m above the floor. A 1.20×10−2-{\rm kg} bullet moving horizontally with a speed of 750 m/s embeds itself within the block
*Wednesday, October 26, 2011 at 3:06pm by chris*

**physics : different question **

Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest. 2000 kg car going 5m/s 500 kg car going 20 m/s 1000 kg car going20m/s 500 kg car going10m/s 1000 kg car going10/s 4000 kg car going 5m/s
*Tuesday, March 8, 2011 at 6:33pm by Diana*

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