Friday

December 9, 2016
Number of results: 61,891

**Physics **

A mover finds that a 20 kg crate initially at rest requires a 75 N horizontal force to set the crate in motion, but only a 60 N force to maintain a constant velocity. Find a) the co-efficient of static friction between crate and floor. b) the co-efficient of kinetic friction ...

*October 13, 2016 by Anonymous *

**Physics**

A 250N force is applied at an angle of 32 degrees above the horizontal to a 96kg box causing it to slide along a floor. The coefficient of friction between the box and the floor is 0.18. What is the magnitude of the net force on the box? The answer is 67N, I'm just not sure ...

*March 10, 2013 by Julia*

**Physics**

Two blocks of masses 40.0kg and 20.0kg are stacked on a table with the heavier block on top. The coefficient of static friction is 0.600 between the top and bottom blocks and 0.300 between the bottom block and the table. What is the required magnitude of a horizontal force ...

*October 31, 2006 by Eric*

**Physics please help its urgent i need help **

A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the ...

*February 16, 2012 by John*

**Maths**

There are a total of 70 pebbles in Bag A and Bag B. There are a total of 120 pebbles in Bag B and Bag C. Bag C contains 3 times as many pebbles as Bag A. How many pebbles are there in Bag B? There were 27 pineapple tarts and murukus. The ratio of the number of pineapple tarts ...

*November 6, 2012 by Javier*

**physics**

A wooden box weighing 281 N is pushed across the floor by a workman who exerts a horizontal force of 166 N. If the force of friction between the box and the floor is 21 N, what is the acceleration (in meters/second^2) of the box?

*March 8, 2011 by nm*

**physics**

wooden box weighing 271 N is pushed across the floor by a workman who exerts a horizontal force of 144 N. If the force of friction between the box and the floor is 28 N, what is the acceleration (in meters/second^2) of the box?

*March 1, 2012 by Anonymous*

**physics**

A wooden box weighing 271 N is pushed across the floor by a workman who exerts a horizontal force of 144 N. If the force of friction between the box and the floor is 28 N, what is the acceleration (in meters/second^2) of the box?

*March 7, 2012 by phil*

**ap Physics**

1. a)A 15.6 kg block is dragged over a rough, horizontal surface by a constant force of 72.2 N acting at an angle of angle 34.8 above the horizontal. The block is displaced 24.6 m and the coefficient of kinetic friction is 0.234.Find the work done by the 72.2 N force.The ...

*February 26, 2011 by jeff*

**Statistics HELP**

There are two bags each containing red balls and yellow balls. Bag A contains 1 red and 4 yellow balls. Bag B contains 3 red and 13 yellow balls. Alva says that if we choose one bag and draw one ball from that bag you should always choose bag B if you are trying to draw a red ...

*February 6, 2015 by Desmond*

**4th grade math**

Kamala had5,026 grams of flour in a canister. She bought a 4,157 gram bag of flour. She poured some flour from the bag to the canister. As a result, the mass of the flour in the canister is now twice the mass of the flour in the bag. How much is in the bag now?

*May 14, 2012 by Brandy*

**Physics**

A worker pushes a 1500 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic friction between the crate and the floor is .220. How much work is done by the floor on the crate? -M*g*(mu,k)*X Mg = 1500 N mu,k = 0.220 X = 24 m It is ...

*February 27, 2007 by Mischa*

**physics**

A 1100 N crate is being pushed across a level floor at a constant speed by a force of 500 N at an angle of 20.0° below the horizontal. (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 500 N force is instead pulling the block at an ...

*October 20, 2010 by laven*

**physic12-dymanics**

A 5kg block slides down an incline of 25 degrees to the horizontal at a constant speed. a) what is the net force on the block? b) what is the magnitude of the friction force acting on the block? c) If friction was negligible and the block was accelerating down , what would be ...

*March 23, 2010 by sk*

**math**

Homer was very generous with his bag of jelly bellys. He gave 2/5 of the whole bag to marge and 1/3 of the whole bag to lisa. he then gave 44 of them to bart and discovered that his bag was empty. how many jelly bellys did homer have to start with? I GOT AS FAR AS ADDING 2/5+1...

*September 17, 2012 by keyla*

**Maths/physics need help agn**

A hand bag containing some loads weighing 162n is carried by two student, each holding the handle of the bag next to him..if each handle is pulled 60degree to the vertical find the force of each student? Help plz

*January 1, 2016 by Collins*

**11 grade physics**

A force of 23.0 N is required to start a 3.0 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? 1 (b) If the 23.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of ...

*November 14, 2010 by Cameron*

**Physics **

a force of 48.0N is required to start a 5.Okg box moving across a horizonatl concrete floor.what is the coefficient of static friction between the box and the floor?If the 48.0-N force continues, the box accelerates at 0.70 m/s squared . What is the coefficient of kinetic ...

*February 15, 2011 by Jen *

**Physics**

A force of 40 N is required to start a 5 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 40 N force continues, the box accelerates at 0.70 m/s2. What is the coefficient of kinetic friction?

*December 4, 2012 by Harry*

**Physics**

A force of 23.0 N is required to start a 3.1 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 23.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic ...

*October 30, 2008 by Grant*

**physics **

a wooden box weighing 286N is pushed across the floor by a workman who exerts a horizontal force of 143N. If the force of friction between the box and the floor is 28N, what is the acceleration (in meters per second) of the box?

*October 3, 2016 by kassy *

**physics**

a 5.0kg concrete block accelerates down a 34 degree slope at 4.2 m/s^2. Find the coefficient of friction between the block and the slope. The component of weight down the slope is mg*SinTheta. The component of weight perpendicular to the slope is mg CosTheta.THe friction force...

*September 13, 2006 by mclanee*

**Physics**

10. You try to move a couch across the floor but it doesn't move. What is the other force acting on the couch? A. only you B. inertia C. static friction (my answer) D. kinetic friction 11. You finally get the couch in Problem 10 to move. What other force is acting on the couch...

*April 9, 2009 by Jasmine*

**Physics **

A 10 kg block is pushed across a rough surface by a 25N force the block moves at a constant velocity when this force is applied. A) determine the magnitude of the friction force acting on the block B) What is the coefficient of friction between the surface and the block

*July 18, 2011 by Edward*

**math**

A businessman bought two bags of maize at the same price per bag. he discovered that one bag was of high quality and the other of low quality. On the high quality bag he made a profit by selling at $ 1,040. Whereas on the low quality bag he made a loss by selling at $880. If ...

*February 5, 2015 by kudu*

**physics**

a 20-kg box sits on a level floor. the coefficient of kinetic friction between floor and box is 0,60. how large a friction force opposes the motion of the box while moving? how much work must be done against friction to move the box 5,0 m?

*October 27, 2014 by sutris*

**physical aspects of nature**

A 1,440-N crate is being pushed across a level floor at a constant speed by a force of 250 N at an angle of 20.0° below the horizontal; (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 250-N force is instead pulling the block at an ...

*March 15, 2012 by greg*

**Physical science**

A box a weight of 100 N rests on a horizontal floor.The coefficient of static friction is 0,40 and the coefficient of kinetic friction is 0,30.DETERMISE THE FRICTIONAL FORCE ACTING ON THE BOX IF A HORIZONTAL FORCE IS APPLIED WITH A MAGNITUDE OF 0 N

*February 16, 2014 by Confidence*

**physics**

Consider the system shown, with m1 = 2.0 kg, m2 = 3.0 kg, and α = 30o. The force F acts horizontally to the left and the kinetic coefficient of friction between m1 and the incline is μk = 0.40. The mass m2 is moving up at a constant speed. (a) What is the magnitude ...

*February 19, 2013 by Alli*

**Physics**

What value of F can pull the 5.00 kg box at constant velocity up the incline if uk=0.25. u means coeffiient friction the angle is 30 degrees and 5.00 kg force is going up Break up the weight of the box into two components: Perpendicular to the slope, and down the slope. Down ...

*September 16, 2006 by camille*

**PHYSICS**

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle 40° with the horizontal (Fig. 6-19). The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (i) the frictional force on the block from ...

*November 14, 2016 by Carmen*

**Physics**

A car is driven at a constant speed of 21 m/s (76km/h) down a road. The car's engine delivers 52 kW of power. Calculate the average force of friction that is resisting the motion of the car. My thinking: Convert 52 kW to 5200 W. Force of friction = force applied because there ...

*November 14, 2007 by Einstein*

**Math**

Kamala had 5,026 grams of flour in a canister. She brought a 4,157 gram bag of flour. She poured some flour from the bag to the canister. As a result, the mass of the flour in the canister is now twice the mass of the flour left in the bag. How much flour is in the bag now?

*January 12, 2012 by Tara*

**math**

kamala had 5026 grams of flour in a canister. she bought a 4157 gram bag of flour. she poured some flour from the bag to the canister. as a result, the mass of the flour in the canister is now twice the mass of the flour left in the bag. how much flour is in the bag now?

*October 31, 2014 by trig*

**Physic**

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on the block from the ...

*September 28, 2011 by Don*

**Physics**

If I'm driving a car and I make a turn to the right, what will happen to a bag of items that is sitting next to me in the car-in terms of inertia, friction and centripetal force I think they will fall the opposite direction but why?

*November 21, 2010 by Jacob*

**The Effects of Force**

Question #1: A basketball momentarily changes shape as it bounces off the floor. This is due to balanced forces acting on the ball. a. true b. false According to what I have studied when balanced forces are on an object, that object doesn't move, but when unbalanced objects ...

*February 10, 2016 by Gourami*

**physics**

A block slides down a rough plane. The plane makes an angle of 60 degrees with the horizontal, the weight of the block is 5.0N and the coefficient of kinetic (dynamic) friction between the block and the plane is 0.30. 1) determine the magnitude of the frictional force acting ...

*October 4, 2006 by blacksheep*

**physics**

A 300 kg boulder is dragged 8 m across level ground with a chain that makes an angle of 37° with the horizontal. If the applied force on the chain is 800 N and there is a coefficient of friction of 0.20, find (a) the work done by the applied force, (b) the force of friction...

*June 26, 2015 by zuqndorpchfj*

**Math**

A designer is designing a cylindrical punching bag. He wants to use a maximum of 1.3m^2 of material. He has determined that the diameter of bag should be 36cm. Determine the maximum possible height of the bag to nearest tenth if a centimeter. Please help and show steps on how ...

*September 18, 2014 by Cherie*

**math**

a 50 pound bag of glossy coat horse feed cost $23.50. A 25 pound bag cost $15.50. How much money per pound would you save by buying the bag with the lower unit price?

*October 29, 2010 by Lilly*

**physics**

The coefficient of static friction between the tires of a car and a horizontal road is 0.515. As the car brakes, what is the magnitude of the maximum acceleration of the car? Assume the net force on the car is the maximum static friction force.

*February 5, 2010 by Kevin*

**Math**

Reasoning In a bag of 24 coins, 5/6 of the coins are pennies. A different bag of 50 coins contains the same number of pennies as the bag of 24 coins. What fraction of the coins in the bag of 50 coins are pennies?

*November 3, 2014 by Rejoice*

**physics**

A)An object at rest has no forces acting on it. B)An object can be moving in one direction while the net force acting on it is in another direction. C)In order to move a massive crate sitting on the floor, the force you apply to the crate has to overcome the force of the crate...

*February 13, 2014 by Sarah*

**FINITE**

selection of colored balls from two bags. Assume that each bag contains 4 balls. Bag a contains 2 red and 2 white, while bag b contains 2 red, 1 white, and 1 blue. You randomly select one ball from bag a, note the color, and place the ball in bag b. You then select a ball from...

*February 16, 2011 by Hil-hellpp!*

**Biology **

6. Consider an experiment in which starch is dissolved in a liter of water. Some of the solution is placed into a securely tied dialysis bag. The dialysis bag is placed into a beaker containing distilled water and iodine for 30 minutes. What are the correct answers for the ...

*September 27, 2016 by Lily Grace *

**physics.pls help**

An ice hut used for winter fishing is at rest on a level patch of snow. The mass of the hut is 80kg. A wind exerts a horizontal force of 205N on the hut, and causes it to accelerate. While in motion, the magnitude of the force of friction acting on the hut is 196N. What is the...

*November 17, 2011 by ted*

**physics**

In a popular amusement park ride, a rotating cylinder of radius 4.00 m is set in rotation at an angular speed of 5.00 rad/s. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum coefficient of friction between a rider's ...

*July 11, 2008 by Elisa*

**Physics**

If a dog chases its tail in a perfect circle of radius r at constant speed v, which of the following is true? A. The dog's acceleration is zero. B. The dog's velocity is constant. C. The sum of the forces, F , acting on the dog is zero. D. The time it takes the dog to make one...

*September 24, 2016 by Lyon*

**MATH 12 HELP!**

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

*May 20, 2012 by the man*

**Physic**

you have to push with a force of 200N to slide a refrigerator across a floor at constant velocity.What is the force of friction acting on the fridge?

*December 7, 2016 by nicholas*

**physics multiple choice**

A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present. What force is needed to push this crate along the same floor at a constant speed 3V if friction is the same as before? A. A constant force 3F is needed. B. A force...

*February 2, 2011 by mely*

**physics multiple choice**

A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present. What force is needed to push this crate along the same floor at a constant speed 3V if friction is the same as before? A. A constant force 3F is needed. B. A force...

*February 2, 2011 by andrea*

**math**

4 numbers are placed in a bag. two are removed and total 2.4. The numbers are returned to the bag and the process is repeated 4 more times. The totals are 2.4 2.5 2.6 2.7 and 2.8. What are the 4 numbers in the bag? please let me know how you arrived at the answer. I was good ...

*January 26, 2010 by Harold*

**Math (Probability)**

Hassan has a bag which contains 20 coloured discs. He randomly chose three discs from the bag and found that two were red and one was white. a) Based on this sample, how many of each coloured disc are in the bag? b) Hassan returned the three discs to the bag and then randomly ...

*June 10, 2012 by Jason*

**math**

The probability of getting a white marble from a bag is 1/5. If there are 37 white marbles in the bag, what is the total number of marbles in the bag

*February 12, 2015 by April *

**Physics Help, Please! **

When a car goes around a curve (without skidding), on a level road, Select one: a. no friction force is needed because the car simply follows the road. b. the friction force of the road on the car increases when the car’s speed decreases. c. the friction force of the road on...

*November 4, 2012 by Michael *

**physics**

Part 1 A 15.6 kg block is dragged over a rough, hor- izontal surface by a constant force of 72.2 N acting at an angle of angle 34.8 above the horizontal. The block is displaced 24.6 m and the coefficient of kinetic friction is 0.234. Find the work done by the 72.2 N force. ...

*February 25, 2011 by erika*

**statistics**

Assume that each bag contains 6 balls. Bag a contains 3 red and 3 white, while bag b contains 2 red, 2 white, and 2 blue. You randomly select one ball from bag a, note the color, and place the ball in bag b. You then select a ball from bag b at random and make note of its ...

*October 4, 2010 by Tiff*

**math**

a grocery store sells a 7 ounce bag of rasins for $1.10 and a 9 ounce bag of rasins for $1.46. Which size bag have the lowest price per ounce.

*January 7, 2013 by crystal*

**Statistics**

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 1264 chips and a standard deviation of 116 chips. (a) Determine the 28th percentile for the number of chocolate chips in a bag. (b) Determine the number of ...

*June 30, 2015 by Amanda*

**Physics**

4. A force of 48 N is required to start a 7.8 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? = (b) Does the coefficent of friction have a unit? A. No, it is a ratio B. No, the units are not real C...

*February 23, 2014 by Rian*

**physics**

A rifle bullet with a mass of 16.5 g traveling toward the right at 285 m/s strikes a large bag of sand and penetrates it to a depth of 22.6 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.

*June 18, 2014 by Sara*

**Physics**

an 88kg cardboard box is being pulled along a level floor. the coefficient of static friction between the box and the floor is 0.23, and the sliding friction is 0.12. What is the weight of the box? What force is needed to start the box moving? What force is needed to keep the ...

*October 29, 2012 by Zach*

**PHYSICS : I NEED HELP PLEASE**

a 33 kg lawnmower is pulled by a 100N force on flat ground. The handle makes a 10 degree angle with the ground. The coefficient of friction between grass and lawnmower wheels is 0.10. Calculate normal force, force of friction and acceleration

*December 6, 2014 by Anonymous*

**Statistics**

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 1264 chips and a standard deviation of 116 chips. (a) Determine the 28th percentile for the number of chocolate chips in a bag. (b) Determine the number of ...

*June 30, 2015 by Amanda*

**Physics - Friction**

**Especially part a) A person, sunbathing on a warm day, is lying horizontally on the deck of a boat. Her mass is 54.6 kg, and the coefficient of static friction between the deck and her is 0.683. Assume that she is moving horizontally, and that the static frictional force is ...

*September 27, 2013 by Kir*

**Physics **

A rope exerts a constant horizontal force of 203N pulling a 68-kg crate across the floor. The velocity of the crate is observed to increase from 3m/s to 5m/s in a time of 4 seconds under the influence of this force and the frictional force exerted by the floor on the crate. ...

*June 21, 2013 by Tim *

**Math**

A bag contains 2 red, 2 blue, and 2 green marbles, Sue takes one marble at a time from this bag without looking. What is the least number of marbles Sue must take from this bag to be sure that she has taken 2 marbles of the same color? A) 2 B)3 C)4 D)6

*October 26, 2008 by Pooja*

**maths**

a bag contains 10 marbles of which 2 are red and 8 are black.Bag B contains 12 marbles of which 4 are ed and 8 are black.A ball is drawn at random from each bag. 5.1 draw a probability tree diagram to show possible outcome

*August 25, 2015 by dimpho*

**Physics: need detailed answer**

a 33 kg lawnmower is pulled by a 100N force on flat ground. The handle makes a 10 degree angle with the ground. The coefficient of friction between grass and lawnmower wheels is 0.10. Calculate normal force, force of friction and acceleration

*December 6, 2014 by Anonymous*

**science**

Words to use: Accelerate - Sliding - Brake - Friction - Slipping - Inertia Velocity - Wheel - Strength - Static - Terminal velocity Questions 1. An object will ____?____ when the net force is not zero. 2. ____?____ will never speed up an object. 3. The friction that prevents ...

*November 9, 2010 by Jacob*

**English**

1. Each girl has a bag. 2. Each girl is holding a bag. 3. Each girl is carrying a bag. ------------ Are they the same in meaning?

*September 9, 2014 by rfvv*

**physics**

The coefficient of static friction between a block and a horizontal floor is 0.414, while the coefficient of kinetic friction is 0.107. The mass of the block is 4.03 kg. A horizontal force is applied to the block and slowly increased. What is the value of the applied ...

*September 23, 2012 by Liz*

**Math**

Ellen has a bag with 3 red marbles and 2 blue marbles in it. She is going to randomly draw a marble from the bag 300300300 times, putting the marble back in the bag after each draw.

*November 3, 2015 by Kalesia Barren*

**Physics **

A boxer is punching the heavy bag. The time of impact of the glove with the bag is 0.10 s. The mass of the glove and his hand is 3 kg. The velocity of the glove just before impact is 25 m/s. What is the average impact force exerted on the glove?

*August 2, 2016 by BT*

**physics **

A boxer is punching the heavy bag. The time of impact of the glove with the bag is 0.10 s. The mass of the glove and his hand is 3 kg. The velocity of the glove just before impact is 25 m/s. What is the average impact force exerted on the glove?

*August 2, 2016 by anonymous*

**physics**

I am trying to study for my exam i have tomorrow and this type of problem keeps giving me trouble can someone please help me:: A 3.24 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=11.8N at an angle theta=23.0degrees above the ...

*January 30, 2012 by Amanda *

**physics**

The coefficient of kinetic friction between a refrigerator (mass 93 kg) and the floor is 0.12, and the coefficient of static friction is 0.35. If you apply the minimum force needed to get the refrigerator to move, what will the acceleration then be?

*September 29, 2010 by jerr *******

**physics**

A 18.4 kg block is dragged over a rough, horizontal surface by a constant force of 126 N acting at an angle of 34.1 ◦ above the horizontal. The block is displaced 20 m, and the coefficient of kinetic friction is 0.123. The acceleration of gravity is 9.8 m/s 2 .Find the ...

*January 6, 2015 by allan*

**College Physics **

A rifle bullet with a mass of 17.5 g traveling toward the right at 293 m/s strikes a large bag of sand and penetrates it to a depth of 23.6 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.

*October 9, 2012 by JB*

**physics**

The coefficient of kinetic friction between a refrigerator (mass 93 kg) and the floor is 0.12, and the coefficient of static friction is 0.35. If you apply the minimum force needed to get the refrigerator to move, what will the acceleration then be? ____ m/s2

*September 29, 2010 by Anonymous*

**Physics**

A sand bag is dropped out of a balloon traveling upward at speed of 2.3m/s. A kiddo drops a bag at the instant the balloon is 34m above the ground. How long does it take the sand bag to hit the ground? I got -2.41s why?

*February 9, 2014 by Sally*

**physics **

The coefficient of static friction between a block and a horizontal floor is 0.35, while the coefficient of kinetic friction is 0.12. The mass of the block is 4.5 kg. A horizontal force is applied to the block and slowly increased. (a) What is the value of the applied ...

*February 16, 2012 by Julie*

**physics**

The coefficient of static friction between a block and a horizontal floor is 0.40, while the coefficient of kinetic friction is 0.15. The mass of the block is 5.0 kg. A horizontal force is applied to the block and slowly increased. (a) What is the value of the applied ...

*March 15, 2012 by nuwan*

**physics**

The coefficient of static friction between a block and a horizontal floor is 0.40, while the coefficient of kinetic friction is 0.15. The mass of the block is 5.0 kg. A horizontal force is applied to the block and slowly increased. (a) What is the value of the applied ...

*March 15, 2012 by tharidu*

**physics**

The coefficient of static friction between a block and a horizontal floor is 0.40, while the coefficient of kinetic friction is 0.15. The mass of the block is 5.0 kg. A horizontal force is applied to the block and slowly increased. (a) What is the value of the applied ...

*March 15, 2012 by tharidu*

**physics**

To move a large crate across a rough floor, you push on it with a force F at an angle of 21°, below the horizontal, as shown in the figure. Find the acceleration of the crate, given that the mass of the crate is m = 38 kg, the applied force is 329 N and the coefficient of ...

*October 14, 2011 by anonymous*

**math**

mr. lee had a bag of red beans and a bag of black beans. 20% of the total number of beans were black, and there were 180 ounces more red beans than black beans. he transferred some red beans to the bag containing black beans, so that, the bag now contained 30% of the total ...

*July 17, 2014 by john*

**physics**

A force of 48 N is required to start a 7.8 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? \mu_s = (b) Does the coefficent of friction have a unit? A. No, it is a ratio B. No, the units are not ...

*February 21, 2014 by shawn*

**Physics **

the coefficient of friction between a 78 kg box and a warehouse floor is .21. what is the friction force?

*November 2, 2011 by Bailee*

**physics-forces**

1. Salim has a paper route. He puts his papers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24kg. The coefficient of static friction between the toboggagn and the snow is 0.18. The coeefficient of kinetic friction between the...

*January 6, 2014 by Jessie*

**Physics-forces**

1. Salim has a paper route. He puts his papers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24kg. The coefficient of static friction between the toboggagn and the snow is 0.18. The coeefficient of kinetic friction between the...

*January 7, 2014 by Jessie*

**Physics**

A bullet of mass 45 g is shot at a speed of 220 m/s into a 5.0-kg bag hanging from a string from the ceiling. The bag absorbs the bullet and begins to swing. To what maximum vertical height will it rise? Hint: Energy is not conserved as the bullet enters the bag but is ...

*November 24, 2010 by Sarah*

**physics**

Let's pretend the Qs are actual numbers. So an unstretched, mass less spring constant Q3 N/m and length Q10 meters is attached between a wall and a mass of Q5 kg. The coefficient of both static and kinetic friction between the mass and the table is Q13. A constant force F is ...

*December 2, 2009 by autumn*

**physics **

A 17 kg block is dragged over a rough, hor- izontal surface by a constant force of 170 N acting at an angle of angle 32.1◦ above the horizontal. The block is displaced 33.9 m, and the coefficient of kinetic friction is 0.199. a] find the work done by 170N b] find the ...

*November 14, 2010 by mary *

**physics**

A draft horse exerts a horizontal force of 600 N dragging a log, on which the force of friction is 500 N. The force due to gravity on the log is 700 N and the ground exerts an upward force of 700 N on it. What is the net force acting on the log?

*November 12, 2011 by sebastian*

**Chemistry**

Which starting material used in the air bag inflator is least important for the proper inflation of the air bag? Would it be necessary to have it present in a precise stoichiometric ratio? Why or why not? 2. What is the correct stoichiometric ratio between NaN3 and KNO3 to ...

*October 28, 2013 by Anonymous*

**Chemistry**

Which starting material used in the air bag inflator is least important for the proper inflation of the air bag? Would it be necessary to have it present in a precise stoichiometric ratio? Why or why not? 2. What is the correct stoichiometric ratio between NaN3 and KNO3 to ...

*October 28, 2013 by Anonymous*

**math**

A bag contains 5 red, 4 white and 6 blue marbles. Another bag with 9 blue marbles has the same ratio of blue to white marbles as the first bag. How many white marbles are there in the second bag?

*October 17, 2013 by Anonymous*