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Work and Energy
Page 3
Questions (3,237)
If a 65 kilogram load was raised 6 meters in 60 seconds determine the minimum rated wattage of the motor needed to accomplish
5 answers
asked by
Joe
1,571 views
A tired squirrel of mass 1kg does push ups by applying a force to elevate it’s centre of mass by 5cm as shown in the following
3 answers
asked by
Ram
796 views
A camper does 7.4 x 102 J of work in lifting a pail filled with water 3.4 m vertically up a well at a constant speed.
a)What
4 answers
asked by
frell
920 views
16. How much work is done on a bookshelf being pulled 4.00 m at an angle of 35.0„a from the horizontal? The magnitude of the
5 answers
asked by
michelle
2,551 views
A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done.
Not sure how to start ! Do I
4 answers
asked by
A
1,472 views
an off-road dumper truck can hold 325 tons of gravel. how much work must be done on the gravel to raise it an average of 9.2 m
4 answers
asked by
frell
599 views
you lift a chair that weighs 50 n to a height of 0.5cm and carry it 10 m across the room how much work do you do on the chair.
I
4 answers
asked by
Hamza
2,292 views
a river does 6500J of work on a water wheel every second.The wheels efficiency is 12 percent.A)How much work in joules can the
5 answers
asked by
kayla
3,056 views
A spring with a tension of 200N/mm is compressed for a distance of 150mm.
Determine the Work done if the spring is compressed a
4 answers
asked by
Pearl
554 views
A 20.0-kg crate sits at rest at the bottom of a 13.5 m -long ramp that is inclined at 40 ∘ above the horizontal. A constant
4 answers
asked by
Kallian
4,065 views
An Effort Of 250N Raises A Load Of 1000N Through 5m In A Pulley System.If The Effort Moves 30m,what Is; (a)the Work Done In
5 answers
asked by
mr.m
1,192 views
A student eats a dinner containing 8.0x10 raised to power 6j of energy. He wishes to do an equivalent amount of work in a nearby
11 answers
asked by
Reigna
3,999 views
what is the smallest time in which a 9.00kW motor can lift a 3500 kg elevator to a height of 9.50m? use 10m/s^2 as g.
4 answers
asked by
Anonymous
2,729 views
A pair of sleds weighs 25kg and experiences a frictional force of 25N. If a dog team applies a 175N force pulling it 12m.
1. Find
4 answers
asked by
Anonymous
1,427 views
You push a refrigerator with a force of 50 N and it moves 3 meters across the floor. How much work is it?
4 answers
asked by
Melissa
922 views
How much work is done in lifting a 6kg object from the ground to a height of 4m?
A 12n object is lifted 5m how much work is done
3 answers
asked by
Derrick
1,293 views
An engine raises 100kg of water through a height of 60m in 20sec. What is the power of the engine. (Take g=10m/s^2
7 answers
asked by
Chinasaramokwu
2,225 views
A bucket begins weighing 30 pounds, including the sand it holds. The bucket is to be lifted to the top of a 25 foot tall
3 answers
asked by
David
1,477 views
Abox of mass 60kg starts from the rest at height h and slides down a rough slope of length 10m, which makes an angle of 25
4 answers
asked by
Sphelele
2,887 views
How much work is done if a person lifts a barbell weighing 450N to a height of 2m?
1 answer
asked by
Anonymous
165 views
A 35-kg trunk is dragged 10 m up a ramp inclined at an angle of 12º to the
horizontal by a force of 90 N applied at an angle of
4 answers
asked by
luke
860 views
Find the work done in pumping the water over the rim of a tank that is 40 feet long and has a semicircular end of radius 10 feet
3 answers
asked by
Anonymous
985 views
a petrol engine raises 200 liters of water in a well from a depth of 7m in 6seconds show that the power of the engine is about
7 answers
asked by
abeje
627 views
1)An electron moved from point A to point B along an equipotential surface.
a)the eclectron performs work in moving from point A
4 answers
asked by
Andrea
1,481 views
I was wondering if my answers are correct. Thanks in advance.
1. A boy pushes down on a car rolling horizontally down the road.
7 answers
asked by
Liz
8,859 views
A force of 40N Will stretch it through 5.0cm and what work will be done in stretching the wire through 5.0M
3 answers
asked by
Moyinoluwa
637 views
What is the efficiency of a pulley if 5000 joules of energy results in 3000 joules of work? Please show your calculations.
1 answer
asked by
Ellie
21 views
A person gets a running start toward a wall from 5 meters away. The person pushes the wall with a force of 500 newtons, but the
1 answer
asked by
Uncle moe last name lester
96 views
A child does 30 Joules of work in 5 seconds. Calculate the child's power.
1 answer
asked by
b
12 views
If a machine requires an input of 6000 J of work to put out 5000 J of work, what is the machine's efficiency?
a 100% b 120% c 40%
1 answer
asked by
e
22 views
Use the table to answer the question.
Machine Output (J) Efficiency (%) A 750 60 B 1,000 40 C 450 30 D 3,000 75 A manufacturer is
3 answers
asked anonymously
37 views
A shot-putter puts a shot (weight =
71.1 N) that leaves his hand at a distance of 1.52 m above the ground. Find the work done by
1 answer
asked by
Banya
19 views
A gardener pushes a lawn roller through a distance of 20 m. If he applies a force of 20 N in a direction inclined at 60° to the
1 answer
asked by
Banya
18 views
● Explain the equation: Work = force x distance
1 answer
asked by
math man
9 views
calculate the work done when a person pushes a car from its stationary position to a distance of 50m applying a force of 200n
10 answers
asked by
augustine samson
2,375 views
A block is acted on by a force that varies as (2.8*10^4 N/m)x for 0<=x<=.21m, and then remains constant at 5880 N for larger x.
1
4 answers
asked by
Megan
4,357 views
A tank is full of water. Find the work required to pump the water out of the spout. (Use 9.8 m/s^2 for g. Use 1000 kg/m^3 as the
4 answers
asked by
A
11,051 views
A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. A 4.87-g pellet
3 answers
asked by
Casey
2,293 views
An electric motor is tested and found 76% efficient. if the input work is 400 J, what is the motors output work?
A ramp has a
1 answer
asked by
Kellie
664 views
A boy of mass 10kg climbs up a steps of height 2m in 20s calculate the power of the boy
2 answers
asked by
Victoria
108 views
A group of students were setting up their school auditorium for a rock concert to be held over the weekend.
The students used a
2 answers
asked by
no name
205 views
Joe is a former basketball player who is now a work-out junkie, and especially loves to do push-ups. He was a good athlete, but
3 answers
asked by
kristin
1,017 views
A 8.43-Newton force was applied for an unknown displacement; however, it is known that 376 joules of work was done. What is the
4 answers
asked by
Kells
319 views
A 5.0kg textbook is raised a distance of 30.0cm as a student prepares to leave for school. How much work did the student do on
9 answers
asked by
Misty T
3,453 views
A bullet of mass of 30g and travelling at a speed of 200msˉ¹ embeds itself in a wooden block. The bullet penetrates a distance
5 answers
asked by
James
3,541 views
Anne exerts a force of 34.1 n to pitch a softball she moves the ball 1.8 meters before releasing it. what amount of work did
4 answers
asked by
:)
547 views
A 100 kg hoop rolls along a horizontal floor so that the hoop's center of mass has a speed of 0.230 m/s. How much work must be
2 answers
asked by
Joey
940 views
A swimming pool has the shape of a right circular cylinder with radius 13 feet and height 10 feet. Suppose that the pool is full
2 answers
asked by
bill
127 views
Calculate the time taken by a water pump of power 500 W to lift 2000 kg of water
to a tank, which is at a height of 15 m from the
5 answers
asked by
Ryan
2,667 views
A satellite in a circular orbit around earth with a radius 1.019 times the mean radius of the earth is hit by an incoming
2 answers
asked by
Andy
864 views
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