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Efficiency
Page 3
Questions (268)
If an engine must do 500 joules of work to pull a 100 N load up to a height of 4 meters, What is the efficiency of the engine?
4 answers
asked by
Brittany
474 views
P can do a piece of work in 9 days. Q is 50% more efficient than P. The number of days it takes
Q to do the same piece of work
3 answers
asked by
rupesh
484 views
In each of the following cases, explain whether you think the situation is efficient or not. If it is efficient , why not? What
2 answers
asked by
Cindy
523 views
As chief officer of the Northwest Veterans' Home, you are preparing for a very important meeting with the Joint Budgetary
2 answers
asked by
righteous dude
672 views
Economists believe that resources should be used as efficiently as possible to
1 answer
asked by
dee
428 views
Given a worker with 8hours shift, where each hour of effort produce 3 widgets
The price rate of one widget produced is $5 , also
3 answers
asked by
.
23 views
Help!!!
Business Week, in an article dealing with management, wrote, "When he took over the furniture factory three years
1 answer
asked by
jean
455 views
A man is using a pulley to raise a weight. He is applying 45 joules of energy to pull on that rope and 44.325 joules of energy
2 answers
asked anonymously
46 views
Which of the following explains different types of efficiency?(1 point)
Responses Code complexity refers to the number of
1 answer
asked anonymously
62 views
what is ment by allocative and productive efficency
stuff
1 answer
asked by
nadine
415 views
A woman expends 96 kJ of energy in walking a kilometer. The energy is supplied by the metabolic breakdown of food intake and has
3 answers
asked by
James
2,109 views
You use an inclined plane to move furniture into a truck. You perform 224 kJ of work, but only do 91 kJ of useful work. What is
3 answers
asked by
meriyhome
1,992 views
you do 185 J of work pulling a cart
up a ramp. if the ramp does 153 J of work,what is the efficient of the ramp? A)82.7 percent
6 answers
asked by
little kakashi hatake
1,757 views
suppose a car operates so inefficently that only 16% of the thermal energy from burning fuel is converted to useful "wheel
5 answers
asked by
jer
1,669 views
An electric motor is tested and found 76% efficient. if the input work is 400 J, what is the motors output work?
3 answers
asked by
han
1,531 views
A tow truck attaches a cable to a car stuck in a muddy ditch. The 1250 kg car is pulled up an
embankment to a height of 1.8 m at
1 answer
asked anonymously
46 views
a 200 kg block was moved along an inclined plane to a height of 10m. during this process 3000J of energy was lost due to
5 answers
asked by
april
1,228 views
The useful energy output of an engine is 1.50 × 103 kJ and the total mechanical energy input is 4.32 x 103 kJ . The efficiency
2 answers
asked by
oihln
1,149 views
Your crew can pave two driveways in a day. You work five days per week but take off 2 weeks each year for holidays and
4 answers
asked by
Teddy
1,092 views
Hello agein, a biger question this time.
Height difference H 180 meters Flow T 3000 tons / second Delivery 4.2 GW P a) How large
2 answers
asked by
Oddbjørn
1,079 views
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
3 answers
asked by
Anonymous
962 views
1) On the construction site an electric crane is used to lift materials to the 10th floor. A 180 kW motor requires 2.0 minutes
10 answers
asked by
Lucina
885 views
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
2 answers
asked by
CB
843 views
a process generates 250 watts of useful energy and 600 watts of waste energy. what is the efficiency of the process?
A 29% B 42%
1 answer
asked anonymously
33 views
an electrical energy supplied to a toy car was 240 joules.If the car weighing 40N moved through a distance of 5m,calculate the
2 answers
asked by
nanakofi
836 views
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
2 answers
asked by
Anonymous
720 views
if 1000 articles of a given type can be returned out by a first machine in 8 hours, by a second in 5 hours, and by the third in
2 answers
asked by
jelaine
645 views
Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J
2 answers
asked by
Angel
600 views
An engine removes 260 J from a reservoir at 385 K and exhausts 210 J to a reservoir at 200 K.
How much more work could be done if
2 answers
asked by
lis
558 views
If 250 joules of work are performed by an engine using 600 joules of energy in 5 seconds, what is the efficiency of the engine?
2 answers
asked by
anonymous
530 views
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
2 answers
asked by
Rob
543 views
A moto of a crane is lifting a 100 kg load 20m high using 25 kj of electrical energy. calculate the efficiency
2 answers
asked by
naomi
519 views
effiencent
6 answers
asked anonymously
15 views
Which option best analyzes how exchange becomes more efficient at a national scale? ( 1 point )
A.) Countries enter into treaties
1 answer
asked anonymously
84 views
bob wanted to speed up the making of guns by having machines manufacture each part all machine made parts would be alike, for
1 answer
asked anonymously
46 views
The efficiency of a machine is 80%.calculate,the amount of energy needed by the machine to do work of 150joules.
1 answer
asked by
Emmanuel
515 views
A car converts 1000 J of energy from a sample of fuel. 750 J of heat (thermal energy) is produced by the engine, 150 J of heat
1 answer
asked by
KC
489 views
A machine has a work output of 28ax^5 joules and a work input of 7a^2x^6 joules. What is the efficiency of the machine?
2 answers
asked by
Lizzie
487 views
Aa particular bicycle is 25% effificent in converting the energy of a cyclist to mechanical energy (that is, she puts in four
1 answer
asked by
Francis
471 views
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
1 answer
asked by
Rob
462 views
A machine loses 600 kJ as waste heat while producing 5,350 kJ of useful energy output. The efficiency of this machine is
1 answer
asked by
l
444 views
Which of these is more efficient on a large/small scale (power generation) and why?
burning hydrogen to generate heat to drive
1 answer
asked by
Alicia
456 views
which option best analyzes how exchange becomes more efficient at a national scale
1 answer
asked anonymously
143 views
A stage crew member uses a pulley system to lift scenery for the school play. If he does 750 J of work and the pulley system
1 answer
asked by
LanguadeHarts
41 views
6) 500J of work is required by a machine to raise a load of 250N through a vertical distance of 1.6m. the efficiency of the
1 answer
asked anonymously
31 views
Chloe put 800 J of work into raising a kite, while the kite rose to a height of 15 m with a force of 40 N. Calculate the
1 answer
asked anonymously
11 views
"answer your question in seconds" more like YEARS
5 answers
asked anonymously
13 views
efficiency science. TEST/QUIZ'S
1 answer
asked anonymously
8 views
Efficiency of Machines Quick Check
Which car has the greatest efficiency? (1 point) O a 1,200 kg car that travels 15 km per liter
3 answers
asked anonymously
184 views
Which of the following are reasons to embrace technology? Choose all that apply.
Responses Technology makes communication
1 answer
asked anonymously
33 views
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