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Work and Power
Page 3
Questions (191)
A weight lifter lits a 1250 pound barbell 2 meters in 3 seconds. How much power was used to lift the barbell
2 answers
asked by
janice
1,041 views
what is your power output if you climb a 2m ladder in 10 seconds? suppose your height is 565N.
2 answers
asked by
Chita_Cheee
970 views
At the gym, a woman lifts 40 kilograms of weights on the leg press machine. It takes her 0.5 seconds to raise the weights a
2 answers
asked by
Tina
951 views
A chair lift carries people of average mass 75kg to a height of 450m above the starting point. Calculate a) the work done by the
2 answers
asked by
Luc
926 views
A 75.0-kg cross-country skier is climbing a 3.0o
slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N.
1 answer
asked by
Anonymous
894 views
A student eats a dinner containing 8.0 X 10^6 Joules of energy. He wishes to do an equivalent amount of work in a nearby gym by
3 answers
asked by
Ande
866 views
if a force of 140 neaten is applied by a car over a distance of 10 metre within 10 second, calculate.
(i) work done by the car.
1 answer
asked by
victor
428 views
a girl lifts a 100 N load a height of 2.0 m in a time of 0.5 s. what power does the girl produce?
3 answers
asked by
Anonymous
795 views
Two People who weigh the same climb a flight of stairs. The 1st person climbs the stairs in 30s, and the 2nd person climbs them
4 answers
asked by
Lee
812 views
Calculate the watts of power expended when a force of 1.8 N moves a book 2.0 m in a time interval of 1.0 M/S
3 answers
asked by
britches
765 views
A motor does 5,000 of work in 20 seconds what is the power of the motor
3 answers
asked by
Anonymous
720 views
What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h?
Working at this rate, how long
2 answers
asked by
bill
734 views
A person who weigh 500N climbs a flight of straight from the ground to the 4th floor of a building in 40sec. If the height of
2 answers
asked by
EM
729 views
A certain rain cloud at an altitude of 1.90 km contains 3.20 107 kg of water vapor. How long would it take for a 2.18-kW pump to
2 answers
asked by
Dhruba
714 views
A horizontal force of 790 N is needed to drag a crate across a horizontal floor with a constant speed. You drag the crate using
2 answers
asked by
Manny Aragon
691 views
I have a couple physics questions I need help with please! If you could show me step-by-step directions, I'd really appreciate
2 answers
asked by
physicsclass
669 views
How far will 350 joules raise a block weighing 7 newtons?
3 answers
asked by
tori
689 views
if a 700-kg piano us lifted 4.0 meters in 14 seconds, how much power is developed
2 answers
asked by
tyler
661 views
A standard man uses a bicycle of mass 30 kg to travel at constant speed along a 5 km long road up
a hill. The hill rises 250 m
7 answers
asked by
Some Guy
679 views
During a workout, the football players at Rutgers State University ran up the stadium stairs at a steady pace in 48 s. The
1 answer
asked by
Jennifer
667 views
how long does it take a 19kW steam engine to do 6.8x10^7 J of work?
3 answers
asked by
yo
661 views
In a time of 10s, a 70 kg student runs up 2 flights of stairs whose combined vertical height is 8.0m. compute the student's
2 answers
asked by
Wendi
681 views
who develops more power,an 80kg man who walks up a height of 20 steps each 17.5cm high in 7second or one who pushes an 80kg box
2 answers
asked by
mukuba
645 views
A 60kg boy climbs 70 fligts of stairs each 20cm high in one minute how much powers is developed?
2 answers
asked by
physics
595 views
A machine carries a 4.5 kg package from an initial position of di = (0.50 m) + (0.75 m) + (0.20 m) at t = 0 to a final position
2 answers
asked by
Ben
599 views
a motorist runs out of gas and must push his 3000kg car across a flat road 200m to the gas station. ignoring friction how much
2 answers
asked by
matt
609 views
Three friends each do work to push an object across the room. Katie does 400 J of work while pushing her object across the room
1 answer
asked anonymously
34 views
A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising
2 answers
asked by
Anonymous
607 views
A MAN OF MASS 50KG ASSEND A FLIGHT OF STAIRS 5M HIGH IN 5SECONDS IF ACCELERATION DUE TO GRAVITY IS 10M PERSECONDSQUARE CALCULATE
2 answers
asked by
ALLIYU
563 views
a girl whose mass is 40kg walk up a fight of steps each 150mm height in second find the average power developed (g=10m/5'2
5 answers
asked by
Wilson
560 views
At a certain instant, a particle-like object is acted on by a force F = (4.0 N) - (2.0 N) + (9.0 N) while the object's velocity
2 answers
asked by
Hariett
573 views
A helicopter winches up an injured person from a boat. The person plus equipment has a mass of 104 kg. If the height of the lift
2 answers
asked by
Anonymous
556 views
In 37.0 s, a pump delivers 552 dm3 of oil into barrels on a platform 29.0 m above the pump intake pipe. The density of the oil
2 answers
asked by
candace johnston
524 views
a fork lift picks up a crate using 400 N. it moves the crate 20 meters in 50 seconds. how much power is used?
2 answers
asked by
chantel
523 views
. A weightlifter lifts a 76.0 kg barbell 2.60 m 20 times in 1.50 minutes. What is his power output
(a) in watts and (b) in hp?
2 answers
asked by
Anonymous
519 views
Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time
2 answers
asked by
Sabrina
525 views
Your horse is pulling a rope that is used to lift a bale of hay. The bale has a mass of 30 kg. Your horse has a max power output
2 answers
asked by
Anonymous
519 views
How much power does a 63.0 kg athlete develop as he climbs a 5.2 meter rope in 3.5 sec
2 answers
asked by
LilYeet
494 views
How much work must you do to push a 13 block of steel across a steel table at a steady speed of 1.3 for 3.7 ? what is the Wnet
2 answers
asked by
Dan
512 views
A force of 297.0 N is used to push a 165 kg mass 30.0 m horizontally in 3.00 s.
(a) Calculate the work done on the mass. Enter a
2 answers
asked by
Manny Aragon
512 views
An elevator lifts a person weighing 625 newtons a distance of 7 meters. If the elevator uses 875 watts of power to lift the
2 answers
asked by
Anonymous
520 views
How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
3 answers
asked by
John
495 views
Calculate the work done by non conservative forces of a hockey stick hitting a tennis ball using elastic potential energy, and
1 answer
asked by
Pat
495 views
a labourer lifts 100 stone to a height of 6m in two minute.if mass of each stone be one kilogram, calculate the average power (
2 answers
asked by
VAIBHAV
483 views
how much power does a 63kg athlete develops as he climbs a 5.2m rope in 3.5 second
2 answers
asked by
bj
489 views
a boy whose mass is 69kg climbs a tree 10m high in 12s .calculate the work done and power developed
2 answers
asked by
latela
492 views
in the course of a short race,a car does 50,000 J of work in 7 s. What is the power of the car during a race?
4 answers
asked by
sophie
489 views
A 100Kg stone is dragged 15m over a frozen lake. If the coefficient of friction between the stone and the ice is 0.1 and the
2 answers
asked by
Gazza
483 views
A lift is pulled up to the top of a building by a constant force of 6400N at a constant speed of 2m/s. It takes 3mins to reach
3 answers
asked by
Lina
489 views
A helicopter winches up an injured person from a boat. The person plus equipment has a mass of 104 kg. If the height of the lift
1 answer
asked by
Anonymous
490 views
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Parent Categories (12)
Dynamics
Energy
Energy and Power
Force and Motion
Forces
Forces and Motion
Mechanics
Mechanics and Motion
Mechanics/Physical Forces
Physical Science
Physics
Work and Energy