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Energy and Work
Page 4
Questions (241)
Which motor performs more work in the same amount of time- a 10 kW or a 20 kW motor? Explain your reasoning.
Power masures work
1 answer
asked by
Anonymous
858 views
need help with this question please
a 1kg block starts at rest and slides down the incline. the coefficient of friction between
4 answers
asked by
sammeh
835 views
Hi! please help
A sledge loaded with bricks has a total mass of 17.8 kg and is pulled at constant speed by a rope inclined at
2 answers
asked by
Chan
856 views
A diver standing on the diving board has a mass of 89.0 kg and has a gravitational potential energy of 2.50 x 103 J. Determine
1 answer
asked by
JodyAnn
811 views
Estimate the energy required from fuel to launch a 1465 kg satellite into orbit 1375 km above the Earth’s surface. Consider
1 answer
asked by
Sarah
620 views
If 27 J of work are needed to stretch a spring from 18 cm to 24 cm and 45 J are needed to stretch it from 24 cm to 30 cm, what
1 answer
asked by
Alan
797 views
(i)For the wheel of diameter 10 cm, find its final speed after traversing a distance of 10 m down an incline of 25º. Assume it
3 answers
asked by
Oisin
782 views
A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 600 kg. Before a
3 answers
asked by
monic
785 views
A moving 1.60 kg block collides with a horizontal spring whose spring constant is 295 N/m. The block compresses the spring a
2 answers
asked by
rory
766 views
How much work must be done to bring three electrons from a great distance apart to 5.5×10−10 m
2 answers
asked by
Anonymous
758 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
A spring gun (k = 27.1 N/m) is used to shoot a 51.1-g ball horizontally. Initially the spring is compressed by 16.5 cm. The ball
2 answers
asked by
Liz
744 views
Under less than ideal conditions, a student pushes a 6 kg cart holding 2 boxes of books up a ramp to a platform that is 1.8 m
1 answer
asked by
Ronald
727 views
A spring-like trampoline dips down 0.06 m when a particular person stands on it. If this person jumps up to a height of 0.29 m
3 answers
asked by
Michael
682 views
The amount of internal energy needed to
raise the temperature of 0.26 kg of water by 0.3�C is 326.5 J. How fast must a 0.26 kg
2 answers
asked by
Ted
707 views
A 85 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 3.5 m/s.
How fast is he going as he
1 answer
asked by
micole
702 views
49-kg woman cheats on her diet and eats a 582-Calorie (582 kcal) jelly doughnut for breakfast.
(a) How many joules of energy are
2 answers
asked by
Annette
681 views
At a carnival, you can try to ring a bell by striking a target with a 8.46-kg hammer. In response, a 0.411-kg metal piece is
2 answers
asked by
Ben
638 views
While taking a plane flight to a meeting, a physicist decides to do a mental calculation of how much fuel the plane would
1 answer
asked by
Justin
646 views
How do you use this equation?
mgh+1/2mvh=mgh+1/2mv^2+Fd
2 answers
asked by
Cassidy
666 views
A moving 4.80 kg block collides with a horizontal spring whose spring constant is 243 N/m.
The block compresses the spring a
2 answers
asked by
Courtney
660 views
When a 1.53-kilogram mass is placed on a spring
with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500
1 answer
asked by
Anon
673 views
how much work can a 50.0kg wreckin ball traveling at 5.00m/s do when striking a building
2 answers
asked by
maya
595 views
A pole-vaulter just clears the bar at 5.34 m and falls back to the ground. The change in the vaulter's potential energy during
1 answer
asked by
Dee
603 views
A 12 g bullet is accelerated in a rifle barrel 69.2 cm long to a speed of 864 m/s.
Use the work-energy theorem to find the
1 answer
asked by
luma
597 views
A moving 3.20 kg block collides with a horizontal spring whose spring constant is 224 N/m.
The block compresses the spring a
4 answers
asked by
Laura
621 views
Use the work-energy theorem to solve each of these problems. You can use Newton's laws to check your answers. Neglect air
2 answers
asked by
Bout
573 views
A large sport utility vehicle has a mass of 2500kg. Calculate the mass of CO2 emitted into the atmosphere upon accelerating the
1 answer
asked by
Ashley
574 views
In the Figure the pulley has negligible mass, and both it and the inclined plane are frictionless. Block A has a mass of 1.3 kg,
2 answers
asked by
sweety
592 views
A red bead releasd from rest at height H slides down a wire without sticking to a green bead initally at rest. The mass of the
2 answers
asked by
Margaret
578 views
A 3.47 kg ball is attached to a ceiling by a 1.63 m long string. The height of the room is 5.59 m. What is the gravitational
2 answers
asked by
Gabe
567 views
A moving 3.20 kg block collides with a horizontal spring whose spring constant is 224 N/m.
The block compresses the spring a
2 answers
asked by
Laura
573 views
The wattage of a commercial ice maker is 226 W and is the rate at which it does work. The ice maker operates just like a
2 answers
asked by
angie
579 views
a farmer drives a 0.100 kg iron spike with a 2.00 kg sledge hammer. the sledge hammer moves at a speed of 3.00 m/s and comes to
2 answers
asked by
tulip
569 views
If a 60 kg man is riding a Monarch ergometer at 50 rpm and the resistance is 2.0 kg, what is the power output?
2 answers
asked by
Natasha
554 views
A weightlifter has a basal metabolic rate of 64.6 W. As he is working out, his metabolic rate increases by about 650 W.
(a) How
2 answers
asked by
Maria
570 views
Please help me solve this, most likely simple, problem. I am just starting to learn physics and am finding it very confusing. If
4 answers
asked by
Rich
565 views
A 10 g particle has the potential energy shown in a graph with the y-axis label U(J) and the x axis is labeled in cm. There is a
3 answers
asked by
Ashley
551 views
A 1000 kg car rolling on a horizontal surface has speed v = 55 km/h when it strikes a horizontal coiled spring and is brought to
2 answers
asked by
Brooke
547 views
A SPRING OF FORCE CONSTANT 1500Nm-1 IS ACTED UPON BY A CONSTANT FORCE OF 75N CALCULATE THE POTENTIAL ENERGY STORED IN TH
2 answers
asked by
HAJARA
530 views
A 230-kg roller coaster reaches the top of the steepest hill with a speed of 5.20 km/h. It then descends the hill, which is at
2 answers
asked by
Bex
537 views
How much time is needed to produce 840 joules of work if 100 watts of power is used?
2 answers
asked by
Rene
540 views
100 kg car moving at 22 m/s runs into a horizontal spring with spring constant 4200 N/m. How far does the car displace the
2 answers
asked by
Brandi
518 views
A 50 kg piston with a radius of 50 cm floats on a cylinder that is filled with air. The air in the cylinder fills the entire
2 answers
asked by
Anonymous
526 views
A 50kg barrel of Bud is rolled up a 10 meter ramp to the back of the truck.The ramp makes a 30degree angle with the ground.
What
2 answers
asked by
brent k
525 views
A moving 4.5 kg block collides with a horizontal spring whose spring constant is 226 N/m (see figure). The block compresses the
1 answer
asked by
David
522 views
A lawn roller is pushed across a lawn by a force of 127 N along the direction of the handle, which is 22.5° above the
2 answers
asked by
taylor
513 views
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
3 answers
asked by
jamie
508 views
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
2 answers
asked by
Dani
495 views
consider a cart being pulled up an inclined plane by a student during a Physics lab. The applied force on the cart is 18 N is
1 answer
asked by
Allison
502 views
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Parent Categories (12)
Dynamics
Electromagnetism
Forces and Motion
Kinematics
Kinetics
Mathematics
Mechanics
Physics
Physics/Newtonian Mechanics
Physics/Science
Science
Thermodynamics