Wednesday

April 16, 2014

April 16, 2014

Number of results: 55,690

**Physics**

A person lifts a 5.2 kg cement block a vertical distance 1.2 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process.
*Monday, January 9, 2012 at 10:50pm by Mike*

**physics**

A person lifts a 4.4 kg cement block a vertical distance of 1.30 m and then carries the block horizontally a distance of 13.50 m. (a) How much work is done by the person in the process?
*Wednesday, November 9, 2011 at 3:20pm by Anonymous*

**Khan**

A person lifts a 4.3 kg cement block a vertical distance of 1.3 m and then carries the block horizontally a distance of 5.3 m. The acceleration of gravity is 9.81 m/s 2 . a) Determine the work done by the person in the process. Answer in units of J
*Tuesday, November 15, 2011 at 9:52pm by Hajib*

**physics problem that i neeeed help with!**

A person lifts a 3.8 kg cement block a vertical distance 0.9 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process. ? J (by person) ? J (by force of gravity)
*Thursday, April 15, 2010 at 4:45pm by brittany*

**physics**

A person lifts a 5.5 kg cement block a vertical distance 1.1 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process. J (by person) J (by force of gravity)
*Monday, January 3, 2011 at 10:46pm by Anonymous*

**physics**

A person lifts a 4.6 kg cement block a vertical distance of 1.43 m and then carries the block horizontally a distance of 10.50 m. (a) How much work is done by the person in the process? (b) How much work is done by gravity in the process?
*Saturday, January 26, 2013 at 9:34pm by Jayde Larson*

**Begley**

A person lifts a 4.1 kg cement block a vertical distance of 0.79 m and then carries the block horizontally a distance of 13.30 m. (a) How much work is done by the person in the process? (b) How much work is done by gravity in the process?
*Wednesday, February 29, 2012 at 6:57pm by Bryson*

**physics**

a person lifts a 4.3 kg centimeter block a vertical distance of 1.10m. and then carries the block horizontally a distance of 10.0m. How much work is done by the person? How much work is done by gravity?
*Monday, January 14, 2013 at 9:18pm by Kalynn*

**physics**

a person lifts a 4.3 kg centimeter block a vertical distance of 1.10m. and then carries the block horizontally a distance of 10.0m. How much work is done by the person? How much work is done by gravity?
*Monday, January 14, 2013 at 9:19pm by Kalynn*

**Math**

A contractor requires a cement mix that is 70% sand and 30% cement. He has 700 kg of a cement mix that is 80% sand and 20% cement. How much cement should he add so that he gets the required mix? My set up: required mix = (S)(.7) + (C)(3) 700kg = (S)(.8) + (C+X)(.2) Is this ...
*Thursday, August 25, 2011 at 3:10pm by Kyle*

**physics**

A rescue helicopter lifts a 85.2-kg person straight up by means of a cable. The person has an upward acceleration of 0.764 m/s2 and is lifted from rest through a distance of 12.5 m. (a) What is the tension in the cable? How much work is done by (b) the tension in the cable and...
*Monday, February 28, 2011 at 11:24am by shaknocka*

**physics**

A rescue helicopter lifts a 85.8-kg person straight up by means of a cable. The person has an upward acceleration of 0.643 m/s2 and is lifted from rest through a distance of 13.1 m. (a) What is the tension in the cable? How much work is done by (b) the tension in the cable and...
*Monday, November 4, 2013 at 2:48pm by Anonymous*

**Physics**

A rescue helicopter lifts a 65 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 13 m. (a) What is the tension in the cable? N (b) How much work is done by the tension in the cable? J (c...
*Tuesday, October 14, 2008 at 9:34pm by Brandon*

**Physics**

A rescue helicopter lifts a 65 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 13 m. (a) What is the tension in the cable? N (b) How much work is done by the tension in the cable? J (c...
*Wednesday, October 15, 2008 at 12:32pm by Brandon*

**Physics**

A rescue helicopter lifts a 65 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 13 m. (a) What is the tension in the cable? N (b) How much work is done by the tension in the cable? J (c...
*Wednesday, October 29, 2008 at 1:41pm by Brandon*

**geometry**

Find the weight to the nearest kg, of the cement block. Cement weighs 1700 kg/m3. 12cm x 10cm and 40cm x 20 cm x 20cm.
*Saturday, April 20, 2013 at 4:47pm by Dee*

**physics**

A person of mass 84.5 kg is initially at rest on the edge of a large stationary platform of mass 150 kg, supported by frictionless wheels on a horizontal surface. The person jumps off the platform, traveling a horizontal distance of 1.00 m while falling a vertical distance of ...
*Friday, February 24, 2012 at 1:23am by John*

**Physics 11th grade**

Squaw Valley ski area in California claims that its lifts can move 48700 people per hour. If the average lift carries people about 185 m (vertically) higher, estimate the maximum total power needed. (Assume an average mass per person of 70 kg.)
*Saturday, February 13, 2010 at 6:58pm by Luricela*

**Physics**

The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 72.4-kg person straight up by means of a cable. The person has an upward acceleration ...
*Tuesday, February 26, 2013 at 3:57pm by Randy*

**physics**

The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 85.8-kg person straight up by means of a cable. The person has an upward acceleration ...
*Monday, November 4, 2013 at 2:47pm by Anonymous*

**Science**

An elevator lifts a person weighing 625 newtons a distance of 7 meters. If the elevator uses 875 watts of power to lift the person, how long does it take?
*Thursday, October 4, 2012 at 10:28pm by Anonymous*

**Physics**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
*Wednesday, July 18, 2012 at 7:12pm by Rob*

**Physics**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
*Wednesday, July 18, 2012 at 8:56pm by Rob*

**Science**

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
*Wednesday, July 18, 2012 at 9:38pm by Jack Hill*

**physics**

A woman lifts her 100-N child up one meter and carries her for a distance of 50 m to the child’s bedroom. How much work does the woman do?
*Sunday, November 4, 2012 at 7:49pm by jeo*

**physics-torque**

A person is doing leg lifts with 3.0-kg ankle weights. She is sitting in a chair with her legs bent at a right angle initially. The quadriceps muscles are attached to the patella via a tendon; the patella is connected to the tibia by the patellar tendon, which attaches to ...
*Wednesday, January 19, 2011 at 9:34pm by Trace*

**physics**

in which of the following is the most work being done by roy and which example roy doing no work? a)roy lifts a 5kg radio up 1 meter b) roy holds a 5 kg radio at a height of 1meter for 3 hours. c)roy lifts a 10 kg TV up 1 meter d)roy lifts a 10 kg TV up 2 meters. e) roy drops ...
*Thursday, May 31, 2012 at 8:52pm by lisa*

**science **

a womans lifts a 300 newton child a distance of 1.5 meters and carries her forward for 6.5meters. how much work does the woman do in lifting the child? b.how much work does the child do?
*Saturday, October 24, 2009 at 8:59pm by Barb *

**Physics**

A cable lifts a 1060-kg elevator at a constant velocity for a distance of 39 m. What is the work done by each of the following?
*Monday, November 12, 2012 at 8:54pm by Don*

**Physics**

A man lifts a 21.1 kg bucket from a well and does 3.1 kJ of work. How deep is the well? Assume that the man lifts the bucket at constant speed. Answer in units of m. I am not sure if I did this right: (mg)(d)= Wnet (21.1 kg)(9.81)(d)= 3100J d= 14.98 meters
*Sunday, March 2, 2008 at 6:09pm by Julia*

**Physics**

In starting an exercise, a 1.60-m tall person lifts a 2.10 kg book from the the ground so it is 2.20m above the ground. What is the potential energy of the book relative to (a) the ground,and(b) the top of the persons head? (c) What is the work done by the person in part(a)?
*Wednesday, December 7, 2011 at 10:02pm by Amanda and Leah*

**Physics**

A cable lifts a 1060-kg elevator at a constant velocity for a distance of 39 m. What is the work done by each of the following?
*Sunday, November 11, 2012 at 6:17am by Donald*

**physics**

An athlete whose mass is 94.0 is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 600 . He lifts the barbell a distance of 0.50 in a time of 2.2 . Part A Use Newton's laws to find the total force ...
*Friday, November 9, 2012 at 4:27pm by Anonymous*

**Science**

it is one of: a box of mineral water (15 kg) Andy Murray and Novak Djokovic (162 kg) Four bags of cement (200 kg) Tiger (320 kg)
*Wednesday, November 17, 2010 at 6:41pm by djoko*

**Physics**

If a person lifts a 21.9 kg bucket very slowly from a well and does 8.3 kJ of work on the bucket, how deep is the well?
*Saturday, December 7, 2013 at 3:58pm by Nicole*

**physics**

A simple pendulum has a mass m and carries a charge q. The pendulum is suspended between the vertical plates of a capacitor of separation distance d. If the string of the pendulum makes an angle θ with the vertical, what is the potential difference between the plates
*Monday, March 12, 2012 at 3:54pm by David*

**physics**

A simple pendulum has a mass m and carries a charge q. The pendulum is suspended between the vertical plates of a capacitor of separation distance d. If the string of the pendulum makes an angle θ with the vertical, what is the potential difference between the plates
*Tuesday, March 13, 2012 at 1:24pm by David*

**physics**

A simple pendulum has a mass m and carries a charge q. The pendulum is suspended between the vertical plates of a capacitor of separation distance d. If the string of the pendulum makes an angle θ with the vertical, what is the potential difference between the plates
*Tuesday, March 13, 2012 at 1:24pm by David*

**physics**

an elevator lifts 4 person each with an average mass of 72 kg to a height of of 20 metre in one minute calculate 1 the work done by the lift and 2 the power exerted
*Friday, October 22, 2010 at 1:08pm by kashib*

**Physics**

1. The weight of the partner is: F = mg = (66.4 kg)(9.8 N/kg) 2. The work done in a single lift is: work = F x distance lifted. 3. Total work = (work /lift)(27 lifts)
*Saturday, November 15, 2008 at 2:37pm by GK*

**physics**

During a workout, a person repeatedly lifts a 13 lb barbell through a distance of 1.5 ft. How many "reps" of this lift are required to burn off 100 Cal?
*Saturday, November 22, 2008 at 9:58pm by lizia*

**physics**

Running at 2.0 m/s a 45.0 kg person collides with a 90.0 kg person who is traveling at 7.0 m/s in the other direction. Upon collision, the 90 kg person continues to travel forward at 1.0 m/s. How fast is the 45 kg person knocked backwards?
*Tuesday, November 29, 2011 at 10:00pm by Jane*

**physics**

An athlete whose mass is 94.0 is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 600 . He lifts the barbell a distance of 0.50 in a time of 2.2 .
*Friday, November 9, 2012 at 2:24pm by Anonymous*

**physics**

in 35s, sam lifts his 8 kg case from the floor to .8m above the ground (in his arms) carries it 24m across the room(at the same height), and puts it on a conveyor belt 1.8 m above the floor. at this point, the machine raises the bag 13 more meters in a mere 2s. compare the ...
*Thursday, January 27, 2011 at 12:53pm by jessie*

**Physics**

A cable lifts a 1200 kg elevator at a constant velocity for a distance of 34.5 m. What is the work done by the tension in the cable.
*Friday, April 30, 2010 at 12:12am by Fallon*

**Physics - thermal mechanical**

During a workout, a person repeatedly lifts a 13 lb barbell through a distance of 1.5 ft. How many "reps" of this lift are required to burn off 100 Cal?
*Friday, April 29, 2011 at 11:08am by Erica L*

**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...
*Wednesday, February 13, 2008 at 4:42pm by dawn*

**physics**

A 35-kg child starting from rest slides down a water slide with a vertical height of 20 m. What is the child’s speed a.)half-way down the slide’s vertical distance b.) three-fourths the distance (ignoring friction)
*Thursday, September 16, 2010 at 10:43am by Crista*

**Physics**

An elevator lifts a total mass of 1.1 x 10^3 kg, a distance of 40 m in 12.5s. How much power does the elevator demonstrate?
*Tuesday, December 4, 2012 at 5:24pm by Taylor*

**physics**

a weightlifter lifts a set of weights a vertical distance of 2.36. if a constant net force of 335 N is exerted on the weights how much net work is done on the weights?
*Friday, March 9, 2012 at 5:36pm by Nikki*

**physics**

A weight lifter lifts a set of weights a vertical distance of 2.07 m. If a constant net force of 335 N is exerted on the weights, how much net work is done on the weights? Answer in units of J
*Friday, January 17, 2014 at 4:46pm by Erin*

**Physics**

1. The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58 kg mass a height of 3.0 m? So to find the force exerted do I just do 58*...
*Saturday, January 13, 2007 at 6:14pm by Anonymous*

**Physics**

A person, standing on a vertical cliff a height h above a lake, wants to jump into the lake but notices a rock just at the surface level with its furthest edge a distance s from the bottom of the cliff. The person realizes that with a running start it will be possible to just ...
*Sunday, September 22, 2013 at 10:13pm by ss01*

**Physics**

A crate of mass 59 kg is pushed across a level floor by a person. If the person exerts a force of 30 N in the horizontal direction and moves the crate a distance of 12 m, what is the work done by the person?
*Wednesday, July 11, 2012 at 10:23am by Sierra*

**physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*Monday, June 11, 2012 at 4:38pm by Akbar*

**Physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*Monday, June 11, 2012 at 6:02pm by Akbar*

**physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*Wednesday, June 13, 2012 at 5:39am by Akbar *

**Math,Ratio**

mr kim mixes cement&sand to make a mixture.he uses 2 pails of cement for every 5 pails of sand. a) if he uses 24 pails of cement,how many pails of sand does he use? b) if he uses 35 pails of sand,how many pails of cement does he use?
*Wednesday, December 28, 2011 at 12:05am by Da S*

**Physics 1**

A crate of mass 42 kg is pushed across a level floor by a person. If the person exerts a force of 20 N in the horizontal direction and moves the crate a distance of 11 m, what is the work done by the person? _____J
*Monday, October 8, 2012 at 8:29pm by John *

**physics**

A cheerleader lifts his 62.2 kg partner straight up oﬀ the ground a distance of 0.89 m before releasing her. The acceleration of gravity is 9.8 m/s 2 . If he does this 19 times, how much work has he done? Answer in units of J
*Thursday, September 27, 2012 at 9:32pm by LYNN*

**physics**

a. How much power is generated by a motor that lifts a 300.0 kg crate vertically 8.0 meters in 6.0 seconds? b. If the crate is dropped on a large vertical spring that has a spring constant of 200,000 N/m, how far does it compress the spring?
*Sunday, December 11, 2011 at 10:13pm by please help*

**physics**

a. How much power is generated by a motor that lifts a 300.0 kg crate vertically 8.0 meters in 6.0 seconds? b. If the crate is dropped on a large vertical spring that has a spring constant of 200,000 N/m, how far does it compress the spring?
*Sunday, December 11, 2011 at 10:28pm by please help*

**physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*Thursday, June 7, 2012 at 11:13pm by Akbar*

**Physics**

In an action-adventure movie, the hero lifts the 89-kg villain straight upward through a distance of 2.0 m in 0.47 s at a constant speed. What power does the hero produce while doing this?
*Sunday, October 24, 2010 at 4:46pm by Xavier*

**Math**

A contractor has been asked to pave 15 miles of new road. Before he can set his price, he needs to know how much the cement will cost. If the road is 45 feet wide and 9 inches thick and the cost of cement is $35 per cubic yard, what will be the cost of the cement needed for ...
*Thursday, May 2, 2013 at 5:51pm by Suzy*

**science**

A cable lifts a 1050-kg elevator at a constant velocity for a distance of 34.1 m. What is the work done by (a) the tension in the cable and (b) the elevator's weight?
*Monday, December 10, 2012 at 7:46pm by Anonymous*

**Science**

Solve this equation: (Energy consumed) * 0.10 = Work done (460*10^3 J)* 0.10 = (number of lifts) * (M g)* (0.60 m) M = 20 kg and g = 9.80 m/s^2. Solve for the number of lifts
*Friday, August 31, 2007 at 8:03pm by drwls*

**physics**

I tried doing this problem but couldnt get the right answer. I dont get how the answer is 2.19cm. Is the distance referring to the vertical or horizontal distance Four people, each with a mass of 73.5 kg, are in a car with a mass of 1190 kg. An earthquake strikes. The driver ...
*Monday, October 4, 2010 at 3:35pm by flame*

**math((PLEASE HELP!))**

A contractor has been asked to pave 15 miles of new road. Before he can set his price, he needs to know how much the cement will cost. If the road is 45 feet wide and 9 inches thick and the cost of cement is $35 per cubic yard, what will be the cost of the cement needed for ...
*Thursday, May 2, 2013 at 6:29pm by Suzy*

**physics help plz thanks**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*Saturday, June 2, 2012 at 5:24pm by Akbar*

**physics need help plz**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*Friday, June 8, 2012 at 10:11am by Akbar*

**physics**

A pump slowly lifts 3.0*10^6 kg of water an average distance of 80.0m in 12minutes. 1) how much work is done in the first 12 minutes? 2)How much power is delivered by the pumps?
*Thursday, November 8, 2012 at 2:51pm by Anonymous*

**Cement quarry application**

In general, Portland cement is the main production of cement industry. Portland cement is kind of meticulous powder, usually gray, which consists of calcium (from limestone), silicate, aluminate (clay) and ferrite. Limestone is the main raw material of cement production; most ...
*Sunday, July 22, 2012 at 10:03pm by jiandan*

**SCIENCE**

Determine the mass of a person on the moon whose mass on Earth is 70 kg Determine the weight of a person on the moon whose weight on Earth is 148 lbs. How is the mutual gravitational force affected by changing the separation distance between two 1.0 kg masses if the distance ...
*Sunday, February 12, 2012 at 11:18pm by Anonymous*

**physics**

two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and determine where its center of Gravity is Located
*Sunday, April 28, 2013 at 4:11am by Anonymous*

**physics**

two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and determine where its center of Gravity is Located
*Sunday, April 28, 2013 at 4:12am by Anonymous*

**physics**

two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and determine where its center of Gravity is Located
*Sunday, April 28, 2013 at 4:14am by Anonymous*

**math**

first you have to convert 176pounds to kg, then we know that 50mg/kg/day so this person weights 78.2 kg. (176/2.25) so that means every capsules contain 250mg to cover 4kg of this person. so this person has to take at least 20pills/day. :)
*Saturday, March 1, 2008 at 7:52pm by No name*

**Physics**

A 67.0 kg astronaut on the planet Zircon (mass = 1.15 x 1023 kg and radius = 2.00 x 106 m) tosses a 8.00 g frog astronaut (a frogonaut?) horizontally with a speed of 7.45 m/s. The 8.00 g frog falls through a vertical distance of 1.40 m and lands a horizontal distance of 8.05 m...
*Thursday, September 5, 2013 at 6:37pm by Riley*

**physics**

Two people carry a heavy electric motor by placing it on a light board 2.00 m long. One person lifts at one end with a force of 400.0 N, and the other lifts at the opposite end with a force of 600.0 N. What is the weight of the motor? and where along the board is the center of...
*Monday, November 9, 2009 at 3:26pm by Student1*

**Physics**

A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?
*Tuesday, February 12, 2013 at 5:34pm by Anon*

**Math**

A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?
*Tuesday, February 12, 2013 at 5:40pm by Anon*

**maths**

The relationship between the vertical height and the horizontal distance of a ball thrown at 45 degree is given by the equation y = x - x^2/50, where y is the vertical height and x is the horizontal distance. (a) Find the maximum vertical height reached. (b) Find the ...
*Sunday, September 1, 2013 at 2:32am by Shane*

**Physics :)**

A motor lifts a 70.0 kg box off the ground, starting from rest. In 8.00 seconds it lifts the box to a height of 20.0 m. At that time, the box is moving upward with a velocity of 5.00 m/s. What is the average power of the motor during this time interval?
*Saturday, June 2, 2012 at 11:59am by Kate*

**Physics**

A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done? Is this a trick question?
*Wednesday, February 8, 2012 at 2:23pm by Mishaka*

**Physics**

Does using (Fcos(theta))d work for this problem or should cos be replaced with sin? A cheerleader lifts his 66.4 kg partner straight up off the ground a distance of 0.718 m before releasing her.If he does this 27 times, how much work has he done?
*Saturday, November 15, 2008 at 2:37pm by Johnathan*

**math**

cooking, measuring flower etc, 3/4 cups, cement mixing need the right ratio of water and sand to cement, i'm sure you can think of one more for yourself
*Saturday, August 22, 2009 at 6:48am by Jordan*

**physics**

a person carries a 58kg package of books up a flight of stairs the length along the stairs is 24 meters the vertical height of the stairs is 12 meters how much work is done in raising the package I know the answer is 6800 J but how to get????
*Wednesday, January 6, 2010 at 9:00pm by dani*

**Phisycs**

Lake Point Tower in Chicago is the tallest apartment building in the United States (although not the tallest building in which there are apartments).Suppose you take the elevator from street level to the roof of the building.The elevator moves almost the entire distance at ...
*Sunday, November 21, 2010 at 6:38am by Sonny*

**physics**

A person uses a lever to lift a load. The person pushes downward with a force of 17 N a vertical distance of 1.8 m. Under ideal condidtions (no friction, bending, etc.), how high up can a load weighing 610 N be lifted? h(lift)=_____cm
*Sunday, February 20, 2011 at 8:52pm by anonymous*

**Maths**

Sam used cement and sand to prepare a mixture. The ratio of the number of pails of cement used to the number of pails of sand used was 1:2. Sam then added 8 more pails of cement and the ratio became 5:2. A.) How many pails of cement was used at first? B.) How many pails of ...
*Sunday, September 30, 2012 at 7:03am by Zayn*

**Physics**

Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. ...
*Sunday, October 17, 2010 at 5:30pm by A*

**Physics**

Determine the work done by a person when lowering an object of mass 2.6 kg by a distance of 2.4 m. The person applies a force Fext such that the object moves with constant speed, i.e., without acceleration,
*Tuesday, November 17, 2009 at 5:01pm by Nikita*

**Phyics**

A 715N person walks up three flights of stairs, covering a total vertical distance of 10.5(a)If as typical, only 20% of the caloric (food) energy is converted to work by the muscles, how many joules and food calories of energy did the person use
*Friday, December 3, 2010 at 12:14am by Anonymous*

**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 ...
*Wednesday, October 17, 2012 at 3:45pm by Anonymous*

**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 ...
*Friday, October 19, 2012 at 4:21pm by Anonymous*

**physics**

lake point tower in chicago is the tallest apartment biulding in the united states (although not the tallest biulding in which there are apartments). supose you take the elevator from street level to the roof of the biulding. the elevator moves almost the entire distance at ...
*Thursday, January 6, 2011 at 11:38pm by Adriana*

**physics**

A person puts a suitcase of mass 10.9 kg into a van, moving the suitcase a total distance of 0.90 m: 0.60 m up and 0.30 m horizontally. How much work is done by the person?
*Tuesday, November 19, 2013 at 10:08pm by Anonymous*

**Physics**

A fire helicopter carries a 555 kg empty water bucket at the end of a cable 20.9 m long. As the aircraft flies back from a fire at a constant speed of 38.4 m/s, the cable makes an angle of 38.3° with respect to the vertical. A) After filling the bucket with sea water, the ...
*Tuesday, September 27, 2011 at 9:29pm by Bella*

**Physics**

A fire helicopter carries a 555 kg empty water bucket at the end of a cable 20.9 m long. As the aircraft flies back from a fire at a constant speed of 38.4 m/s, the cable makes an angle of 38.3° with respect to the vertical. A) After filling the bucket with sea water, the ...
*Wednesday, September 28, 2011 at 12:32am by Bella*

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