# As a result of doing work a person supplies a machine with 1100 J of energy in 12 seconds. The machine in turn does work and delivers 900 J of energy in 14 seconds to some object. what is the

54,621 questions
1. ## Physics

As a result of doing work, a person supplies a machine with 1100 J of energy in 12 seconds. The machine in turn does work and delivers 900 J of energy in 14 seconds to some object. What is the efficiency of this machine?

asked by Anonymous on January 25, 2010
2. ## Health Physics

As a result of doing work, a person supplies a machine with 1100 J of energy in 12 seconds. The machine in turn does work and delivers 900 J of energy in 14 seconds to some object. What is the efficiency of this machine?

asked by Shannon on January 22, 2010
3. ## physics

As a result of doing work a person supplies a machine with 1100 J of energy in 12 seconds. The machine in turn does work and delivers 900 J of energy in 14 seconds to some object. what is the effiecency of this machine?

asked by CB on January 24, 2010
4. ## Physics

A machine is used to either do work or to convert energy. To find the efficiency of a machine, one must compare the power input to the machine to the power output of the machine. What does thepower take into account in addition to the amount of work done

asked by Anonymous on January 24, 2010
5. ## Health Physics

A machine is used to either do work or to convert energy. To find the efficiency of a machine, one must compare the power input to the machine to the power output of the machine. What does thepower take into account in addition to the amount of work done

asked by Shannon on January 23, 2010
6. ## Health Physics

A machine is used to either do work or to convert energy. To find the efficiency of a machine, one must compare the power input to the machine to the power output of the machine. What does thepower take into account in addition to the amount of work done

asked by Shannon on January 22, 2010
7. ## Math (calculus )

A company buys an office machine for \$5200 on January 1 of a given year. the machine is expected to last for eight years at the end of which time its trade in value or salvage value will be 1100\$. if the company figures the decline in value to be the same

asked by Jenna on February 2, 2016
8. ## Math

A company buys an office machine for \$5200 on January 1 of a given year. the machine is expected to last for eight years at the end of which time its trade in value or salvage value will be 1100\$. if the company figures the decline in value to be the same

asked by Jenna on February 2, 2016
9. ## Physics

a great of effort, time, and money has been spent in the quest for the so-called perpetual-motion machine, which is defined as a hypothetical machine that operates or produces useful work indefinitely and/ or a machine that produces more work or energy

asked by John on November 16, 2016
10. ## physics

the efficiency of a machine is 80% determine the work done by a person using this machine to raise a load of 200kg through a vertical distance of 3.0m {take g=10m/s}

asked by joseph on October 7, 2019
11. ## physics

The efficiency of a machine is 80%. Determine the work done by a person using this machine to raise a load of 200kg through a vertical distance of 3.0 (take g = 10m/s)

asked by Anonymous on March 9, 2017
12. ## Science

The efficiency of a machine is 80%.calculate,the amount of energy needed by the machine to do work of 150joules.

asked by Emmanuel on August 25, 2016
13. ## PHYSICS HELP

I am having a real problem with this question. Through the process of doing work, energy can move between the external world and the system as the result of forces or work. I say it's forces, but someone else says it's work because only work and energy can

asked by Pat on January 10, 2007
14. ## physics

If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy? Explain. (Select all that apply.) 1.Yes, when a force does work on an object it always results in an increase in kinetic energy. 2.The work

15. ## physics

If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy? Explain. (Select all that apply.) 1.Yes, when a force does work on an object it always results in an increase in kinetic energy. 2.The work

asked by wassuh on February 4, 2010
16. ## Agosec Ghana

a machine was used to lift a load of 30N through a distance of 2metres. the effort applied was 10N through a distance of 8metres. calculate the. A) mechanical advantage B) work input of the machine C) work output of the machine D) the efficiency of the

asked by Phidelis on June 25, 2015
17. ## science

percentages: to use a machine,u must do the work on the machine called input work. the machine then foes the work on and object called output work. not all the input work gets transmitted to output work. some work is lost due to friction in the machine. if

asked by kim on September 12, 2007
18. ## Science

A box that is initially at rest is pushed by a person at an angle 0 with a force F until it reaches a speed of v. The coefficient of kinetic friction between the box and the surface is U. Is this: work done by person equal to magnitude of friction F work

asked by Anya on March 6, 2013
19. ## Maths

Cub leader Akela purchases supplies for 15 cubs for a 12 day camping trip, with the understanding that each boy get equal shares of the supplies. At the last minute the boys are joined by 5 more cubs and there is no time to buy further supplies. If the

asked by Anonymous on April 17, 2016
20. ## Physics

A rescue helicopter lifts a 70 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 9 m.  What is the tension in the cable?  How much work is done by the tension

asked by Jennifer on February 22, 2015
21. ## 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

asked by Brandon on October 14, 2008
22. ## 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

asked by Brandon on October 29, 2008
23. ## 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

asked by Brandon on October 15, 2008
24. ## physical science

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?

asked by Unmei on May 27, 2014
25. ## Math

This task is about choosing a new washing machine. Your washing machine is broken. You need a new one. The new washing machine must hold at least as much as the old one and spin at least as fast as the old one. You used your old washing machine three times

asked by Z on August 16, 2016
26. ## 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

asked by Anonymous on November 4, 2013
27. ## 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

asked by shaknocka on February 28, 2011
28. ## science

A 49 kg person drinks 270. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 16% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in

asked by Alyssa on September 14, 2012
29. ## chemistry

A 43 kg person drinks 490 g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 16% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in

asked by jamie on September 26, 2008
30. ## chemistry

A 51 kg person drinks 330. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 18% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in

asked by Ellie on September 18, 2011
31. ## chemistry

A 45-kg person drinks 390. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 17% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in

asked by Dani on October 21, 2016
32. ## chemistry

A 51 kg person drinks 270. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 15% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in

asked by Anonymous on September 19, 2011
33. ## Science

A student is trying to identify the different forms of energy described in the following chart: Form of Energy Description Examples Energy A energy that travels in waves through space light radio waves Energy B energy that depends on the height of an

asked by Ariel on November 11, 2015
34. ## 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

asked by Randy on February 26, 2013
35. ## Physic

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 75.4-kg person straight up by means of a cable. The person has an

asked by Lena on March 5, 2015
36. ## 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

asked by Anonymous on November 4, 2013
37. ## science

How can a machine make work easier for you? A. by decreasing the amount of work you do on an object B. by changing the direction of your applied force C. by increasing the work done by the machine D. none of the above**

asked by @realBlueface on February 28, 2019
38. ## Physics

In a simple machine, the energy input is 120j. If the efficiency of the machine is 80%. Calculate the energy output

asked by Gloria on March 29, 2017
39. ## Technology

23. ? List two examples of tools used in each of these major areas of processing: material, energy, and information processing. Ok, this wasn't so hard: 23. There are a few tools that are used in each of the three major types of processing: material,

asked by y912f on April 9, 2010
40. ## 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 89.2-kg person straight up by means of a cable. The person has an

asked by BrookeNeed on October 14, 2016
41. ## physics

you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 80 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 690 kcal have been burned at the end of the workout, what efficiency is the

asked by Shawn on December 4, 2011
42. ## Physics

A load of 500N is raised through 5m by a machine when it's effort E moves simultaneously through a distance of 25m along it's direction. If the machine has efficiency of 80% , calculate a) Total work done by machine. b) Value of E

asked by Yahya Shekha on October 25, 2018
43. ## Ma

Autoparts Inc. produces three types of parts' assemblies: (P,Q,R)and they each require (2,5,3) units of work on machine I and (2,2,4) units of work on machine II respectively. The two machines have respectively (160,190) units of work available per day. It

asked by Jeff on February 26, 2011
44. ## Math

Autoparts Inc. produces three types of parts' assemblies: (P,Q,R)and they each require (2,5,3) units of work on machine I and (2,2,4) units of work on machine II respectively. The two machines have respectively (160,190) units of work available per day. It

asked by Tracy on February 27, 2011

can someone check my answer thanks ! 2.The ability to do work or cause change is called A.velocity. B.energy.(I PICK B.) C.transfer. D.friction. 3.Which type of energy is demonstrated by a person jogging? A.electrical energy B.nuclear energy

asked by matt on March 5, 2014
46. ## 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

asked by Anonymous on December 3, 2010
47. ## Can comeone check my answer for me. Many Thanks!

A set of data is normally distributed with a mean of 1000 and standard deviation of 100. · What would be the standard score for a score of 1100? · What percentage of scores is between 1000 and 1100? · What would be the percentile rank for a score of

asked by Ashley S on October 22, 2012
48. ## science

For a machine with an efficiency of 80%, what is the work output of the machine if its work input is 2,000 joules? would i divide 2000/.80? which gives me 2500? Also, If a machine requires an effort force of 750 newtons applied over a distance of 2 meters,

49. ## physics -jumper

The feet of a standing person of mass m exert a force equal to mg on the floor, and the floor exerts an equal and opposite force upwards on the feet, which we call the normal force. During the extension phase of a vertical jump, the feet exert a force on

asked by lau on June 4, 2010
50. ## science

For a machine with an efficiency of 80%, what is the work output of the machine if its work input is 2,000 joules? would i divide 2000/.80? which gives me 2500?

51. ## physics

a simple machine moves a load of 400N through a distance of 10cm when a force of 20N is applied to it.if the distance moved by the force applied on the machine is 3m.find a)input work b)output work c)AMA d)IMA e)efficiency of the machine.

asked by tesema on June 10, 2019
52. ## math

Jay Corp. bought a machine for \$15,000. The machine is expected to produce 10,000 units. The machine has a residual value of \$5,000. Assuming the machine produces 400 units during Year 1, what should the depreciation expense be? my is answer is \$ 300.00 If

asked by louna on June 28, 2009
53. ## physics

Machines A, B, and C do the same amount of work, but they each take a different amount of time. Machine A takes more time as compared to machine C. Machine B takes the maximum time to do the same amount of work. Which machine expends the most power doing

asked by al on May 21, 2017

Which of the following is true about determining whether someone working for another is an independent contractor or an employee? a) The classification of the person doing the work depends on that person's job title. b)The classification of the person

asked by Gurv on April 12, 2007

A machine is set to give out one number less than twice the number fed into it. A number is fed into the machine. the result is fed back into the machine. The second result is 53. What number was first fed into the machine?

asked by Janice on December 10, 2009
56. ## Science

A person performs a work task at a mechanical efficiency of 20 percent and at total energy output of 15kcal/min. How much energy(kcal/min) is lost as heat? and how much energy(kcal/min) is used to actually perform the work?

asked by Sam on February 29, 2012
57. ## Kinesology

A person performs a work task at a mechanical efficiency of 20 percent and at total energy output of 15kcal/min. How much energy(kcal/min) is lost as heat? and how much energy(kcal/min) is used to actually perform the work?

asked by Sam on February 29, 2012
58. ## physics

Flywheels are large massive wheels (disks) used to store energy. They can be spun up slowly, and then the wheel’s energy can be released quickly to accomplish a task that demands high power. A large flywheel has a 2.4 m diameter and a mass of 300 kg. Its

asked by Anonymous on December 11, 2011
59. ## physics

A 735 N person walks up three flights of stairs, covering a total vertical distance of 10.0 m. If, as is typical, only 20.0% of the caloric (food) energy is converted to work by the muscles, how many joules and food calories of energy did the person use?

asked by Student B on June 12, 2011
60. ## physics

a 715 N person walks up three flights of stairs, covering a total vertical distance of 10.5 m. (a) If, as is 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?

asked by physics student on October 25, 2009
61. ## Physics

A force of 310 N is applied horizontally to a crate in order to displace the crate 45.0 m across a level floor at a constant velocity. As a result of this work, the crate's internal energy is increased by an amount equal to 12 percent of the crate's

asked by Casey on December 4, 2012
62. ## science

How do i calculate how much time it takes to heat water? All I know is the power supplied and the energy required. Thanks power= energy/time Power*time= energy you know the energy, you know the power, solve for time. time(in seconds)=

asked by barbara on January 16, 2007
63. ## college finite math

A product may be made using Machine I or Machine II. The manufacturer estimates that the monthly fixed costs of using Machine I are \$17,000, whereas the monthly fixed costs of using Machine II are \$14,000. The variable costs of manufacturing 1 unit of the

asked by Dee on January 19, 2014
64. ## Physics

Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.7 m diameter and a mass of 270 kg . Its

asked by Jay on November 20, 2015

A company makes three products X, Y and Z. Each product requires processing by three machines A, B and C. The time required to produce one unit of each product is shown below. Product X:- Machine A: 1 Machine B: 2 Machine C: 2 Product Y: Machine A:2

asked by kim on July 11, 2011

A company makes three products X, Y and Z. Each product requires processing by three machines A, B and C. The time required to produce one unit of each product is shown below. Product X:- Machine A: 1 Machine B: 2 Machine C: 2 Product Y: Machine A:2

asked by kIM on July 11, 2011
67. ## MATH

A company makes three products X, Y and Z. Each product requires processing by three machines A, B and C. The time required to produce one unit of each product is shown below. Product X:- Machine A: 1 Machine B: 2 Machine C: 2 Product Y: Machine A:2

asked by Anonymous on July 10, 2011

A company makes three products X, Y and Z. Each product requires processing by three machines A, B and C. The time required to produce one unit of each product is shown below. Product X:- Machine A: 1 Machine B: 2 Machine C: 2 Product Y: Machine A:2

asked by kIM on July 11, 2011

How many grams of carbohydrate does a person of mass 75 kg need to metabolize to climb five flights of stairs (15 m height increase)? Each gram of carbohydrate provides 17.6 kJ of energy. Assume 10.0% efficiency—that is, 10.0% of the available chemical

asked by Nasir on June 11, 2012
70. ## Math 125

I am enrolled in an online Math 125 class. I posted this question earlier in the week and never got a response, so here I am! I am just not understanding these questions. I made the tree diagram as suggested and put all the information at the bottom how I

asked by Christine Johnston on February 18, 2017
71. ## Phsyics Plz Help

How many grams of carbohydrate does a person of mass 75 kg need to metabolize to climb five flights of stairs (15 m height increase)? Each gram of carbohydrate provides 17.6 kJ of energy. Assume 10.0% efficiency—that is, 10.0% of the available chemical

asked by Nasir on June 11, 2012
72. ## physical

if a person exerts 250n force to lift a 1250n object using a simple machine, what is the mecahnical advantage of the machine

asked by Anonymous on April 9, 2012
73. ## physical science

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine? A. 92 percent B. 94 percent C. 97 percent D. 96 percent

asked by Unmei on May 27, 2014
74. ## Science

1. A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What's the efficiency of the machine? A. 92 percent B. 94 percent C. 97 percent D. 96 percent

asked by Anonymous on April 17, 2019
75. ## Physics

The particles as shown in the figure below are connected by a very light rod. They rotate about the y axis at 1.9 rad/s. a. Find the speed of each particle, and use it to calculate the kinetic energy of this system directly from 1/2 mivi2. speed of m1 = 1

76. ## Science-y Math-y Stuff

A machine with 80% efficiency does 4,000 J of work. Using the machine how much work did you do? NEED HELP! PLZ REPLY SOON

asked by NYB on December 13, 2016

1. to be a great asset to your company which of the following should you do? a. always look like you're working hard b. be a problem-solver c. be quiet and keep your eyes open d. be friendly with your boss**** 2. When you are required to team up with

asked by Sid.V on December 20, 2018
78. ## Physics

A 60 kg person utilizes energy at 0.25 horsepower while running up the stairs of a building. Each step is 20 cm highly. How much work does the person do in one minute?

asked by Emma on October 4, 2017
79. ## sci i think its b

A student is trying to identify the different forms of energy described in the following chart: Form of Energy Description Examples Energy A energy that travels in waves through space light radio waves Energy B energy that depends on the height of an

asked by somebody help i am new on November 12, 2014
80. ## physics

A machine loses 600 kJ as waste heat while producing 5,350 kJ of useful energy output. The efficiency of this machine is

asked by l on July 31, 2014
81. ## Science

The Lactic Acid System a. supplies energy needed to walk or cycle continuously b. provides energy to pitch a baseball c. creates energy needed to pass another 5k participant with a burst on energy. d. none of these

asked by Betty on April 2, 2009
82. ## Physics/Math

A machine carries a 5.0 kg package from an initial position of di = (0.50 m) i + (0.75 m) j + (0.20 m) k at t = 0 to a final position of df = (8.00 m) i + (11.0 m) j + (7.40 m) k at t = 13 s. The constant force applied by the machine on the package is F =

asked by Technoboi11 on March 5, 2007
83. ## science

A machine raises a load of 600N through a height of 1.5m when an effort of 100N moves a total distance of 20m.(a) calculate the work done in raising the load.(b) what is the mechanical advantage of the machine?(c) calculate the efficiency of the machine.

asked by Anonymous on March 7, 2016
84. ## physic tecnology

Two 80n children sit together 3m from the center of a teeter-totter and are able to lift 460n that is 1m away from the fulcrum. name the simple machine that is being used inthe problem, calculate the work in,work out mechanical advantage, and the

asked by shkell on April 23, 2013
85. ## Chemistry

At 1100 K, Kp=0.25 for the following reaction. 2SO2(g) + O2(g) (reversible arrows) 2SO3(g) What is the value of K at this temperature? This is what I have so far: I did Kc=0.25(1100(0.0821))^-1 and got Kc=0.00276. That is incorrect. Why? What did I do

asked by Taasha on July 31, 2007
86. ## Physics

Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 75 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 690 kcal have been burned at the end of the workout, what efficiency is

asked by Allie on December 2, 2011
87. ## Physics

elbow raises a 1200 N piano a distance of 5 meters using a set of pulleys. elbow pulls in 20.0 meter of rope while exerting a force of 340 N. a) what is the work output? b) what is work input c) what is the mechanical advantage of this machine? d) what is

asked by Andy on November 3, 2013
88. ## math

A machine has four components, A, B, C, and D, set up in such a manner that all four parts must work for the machine to work properly. Assume the probability of one part working does not depend on the functionality of any of the other parts. Also assume

asked by April on January 24, 2010
89. ## finite

0/20 points | Previous Answers TanFin11 4.1.034. Ask Your Teacher My Notes Question Part Points Submissions Used A company manufactures two products, A and B, on two machines, I and II. It has been determined that the company will realize a profit of

asked by Anonymous on March 6, 2015
90. ## shree mahendra secondary school

For a bathing person supplies 5×10^3Kj energy in 20 litre of water at 15°c temperature.What is the change in temperature of this water?

asked by ritesh on August 23, 2015
91. ## Physics

A machine has an IMA of 6.0 and an AMA of 5.0. What is the work input needed by the machine to raise a 40 kg load by 3.0 m?

asked by April Hanna on October 10, 2016
92. ## Math

A machine has an IMA of 6.0 and an AMA of 5.0. What is the work input needed by the machine to raise a 40 kg load by 3.0 m?

asked by Gabr on May 1, 2017
93. ## Physics

I was wondering if my answers are correct. 1. A 50kg person is taking a ride on an elevator travelling up at a steady speed of 2.5m/s. Find the time fo the elevator trip if the elevator does 4900 J of work on the person. My answer: First I used the formula

asked by Liz on February 3, 2014
94. ## Language Arts

Directions. Identify the tense of each underlined verb. Write past, present or future. In this assignment there is nothing underlined. 1. You will enjoy this book about inventions. -Future 2. Inventors create new machines. -Present 3. Each machine does a

asked by Patrick on November 10, 2015
95. ## science

Does work transfer energy as the result of motion

asked by laura on April 28, 2009
96. ## Physics

A machine require 100J of work to raise a load of 500N through a vertical distance of 1.5M CAL the of the machine

asked by COVENANT on March 11, 2019

I'm confused and am hoping someone could help me understand energy can neither be created nor destroyed... great... so in physics classes we can set up problems and stuff were KEo + PEo = KE + PE Energy intial equals energy final sense energy is conserved

asked by Physics on October 19, 2009
98. ## physics

A machine with v.r requires 1000J of work to raise a load of 500N through a vertical distance of 1.7m . find the efficiency and m.a of the machine.

asked by Azeez on February 19, 2016
99. ## physics

A machine with v.r requires 1000J of work to raise a load of 500N through a vertical distance of 1.7m . find the efficiency and m.a of the machine.

asked by Azeez on February 19, 2016
100. ## physics

A machine with v.r requires 1000J of work to raise a load of 500N through a vertical distance of 1.7m . find the efficiency and m.a of the machine.

asked by Azeez on February 17, 2016