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Energy and Work
Page 2
Questions (241)
A vertical spring with a spring constant of 400 N/m is mounted on the floor. From directly above the spring, which is
3 answers
asked by
Aaron
655 views
A dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each
3 answers
asked by
Monet Nguyen
3,251 views
A block of mass 12.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 4.00 104
3 answers
asked by
Anonymous
1,252 views
A moving 2.20kg block collides with a horizontal spring whose spring constant is 419 N/m. The block compresses the spring a
5 answers
asked by
archi
639 views
A 120 N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy of the child-Earth
4 answers
asked by
Katie
4,673 views
a 1600-kg vehicle moves with a velocity of 19.5 m/s. calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s
3 answers
asked by
bob
3,147 views
a vertical spring whose spring constant is 850 n/m stands on a table and is compressed 0.400m. what speed can it give to a
3 answers
asked by
Anonymous
1,551 views
an automobile to be transported by ship is raised above the dock by a crane. If the gravitational potential energy of the car is
3 answers
asked by
Rio
514 views
A 0.38-kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B.
(a) What is its kinetic energy at A?
3 answers
asked by
Anonymous
803 views
A pendulum of length L = 20.8cm and mass m = 168 g is released from rest
when the cord makes an angle of 65.2� with the vertical.
3 answers
asked by
waqas
439 views
If you do 100 j work in 50 seconds, then your Power output is
4 answers
asked by
Allen
1,584 views
A 2.0 kg rock falls from a height of 25 m to a point 20 m above the ground.
a) how much potential energy does it lose? b) How
3 answers
asked by
Anna
516 views
they expand 10,300 joules of energy to lift some bricks with the lever . if 6,283 joules of energy are applied to bricks what is
3 answers
asked by
the real BARNY THE DINO :)
89 views
A student places her 500 g physics book on a frictionless table. She pushes the book against a spring, compressing the spring by
3 answers
asked by
Lexi
468 views
If a body of weight 10N is lifted from the floor to a table 2m above the floor, calculate the potential energy gained by the
4 answers
asked by
Sonia
630 views
A spring-loaded toy uses a compressed spring to fire a marble out of a
tube. A force of 220 N compresses the spring by 0.14 m.
4 answers
asked by
Raj
1,251 views
The masses are each initially 1.8m above the ground, and the massless frictionless pulley is 4.8m above the ground. (a)
2 answers
asked by
Anonymous
841 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
3 answers
asked by
kate
758 views
The spring shown in the figure is compressed 59cm and used to launch a 100 kg physics student. The track is frictionless until
3 answers
asked by
Dib
1,641 views
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
4 answers
asked by
Unmei
933 views
A 3.0 kg block is moved up a 37 incline under a constant horizontal force of 40.0 N. The coefficient of friction is 0.10 and the
3 answers
asked by
Andrew
519 views
Alfredo, who has a mass of 60 kilograms, jumped off a retaining wall. His kinetic energy when he landed on the ground was 822
4 answers
asked by
Joe
1,862 views
a person's metabolic processes can usually operate at a power of 6 W/kg of body mass for several hours at a time. If a 60 kg
4 answers
asked by
Meghan
592 views
A 91 kg student eats a 200 Calorie doughnut. To “burn it off”, he decides to climb the steps of a tall building. (1 food
3 answers
asked by
dillon
1,970 views
A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy
2 answers
asked by
Hannah
905 views
Use conservation of energy to determine the angular speed of the spool shown in Figure P8.36 after the 3.00 kg bucket has fallen
2 answers
asked by
Nicole
1,331 views
A spacecraft of mass 470 kg rests on the surface of an asteroid of radius 1400 m and mass 2.0*10^12. How much energy must be
3 answers
asked by
roy
707 views
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
3 answers
asked by
Anonymous
611 views
the energy of a ball rolling up an inclined place plane is?
3 answers
asked by
Mary
2,035 views
The label on a candy bar says 470 Calories.Assuming a typical efficiency for energy use by the body, if a 74 kg person were to
4 answers
asked by
ziddi
1,524 views
20. does the international space station have gravitational pe? ke? explain?
-It has gravitation pe. I thought that Gravitational
4 answers
asked by
jess
1,811 views
A construction worker is lifting a load of bricks onto a truck. She does 200J of work in 40 seconds. What is her power output?
Re
2 answers
asked by
zach
79 views
An object is moving at a squared velocity of 30 m/s. The object has a mass of 4 kg. Find the kinetic energy of the object.
1 answer
asked by
skyler
279 views
A roller coaster with people on board has a total mass of 4500 kg and starts at a height of 22 meters with a speed of 2.0 m/s.
3 answers
asked by
mssailormouth
434 views
A 65 kg student consumes 2500 Cal each day and stays at the same weight. For three days in a row, while visiting his parents,
1 answer
asked by
Live
419 views
A process takes place at constant pressure. The volume changes and the temperature increases by 91.0oC. The heat capacity of the
1 answer
asked by
dr
450 views
A mass is attached to a spring is 0.2 kg. The spring's constant is 40 N/m. The mass is stretched to a position of 0.3 m and
5 answers
asked by
Jose Luis
655 views
A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against
3 answers
asked by
KS
623 views
a 50g bullet is shot from a rifle at 900m/s
a) what is the KE of the bullet? b) how much work is done on the bullet if it starts
1 answer
asked by
john
445 views
When are kinetic energy and potential energy equal in magnitude ( equal in amount)
3 answers
asked anonymously
31 views
A machine’s efficiency is determined to be 60%. The input work is 3,000 joules. What is the output work?(1 point)
Responses 50
10 answers
asked by
Answer
70 views
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
2 answers
asked by
Unmei
772 views
A pole-vaulter just clears the bar at 4.07 m and falls back to the ground. The change in the vaulter's potential energy during
4 answers
asked by
Anonymous
592 views
Calculate the watts of power expended when a force of 2.0N moves a book 2.4m in a time interval of 1.0 s.
Express your answer to
2 answers
asked by
Anonymous
720 views
7. During the process of photosynthesis, plants convert carbon dioxide and water into glucose. Covalent bonds hold the glucose
6 answers
asked by
CCA
2,564 views
Which unit represents the rate at which work is done or energy is transferred?
A. Kilogram B. Joule C. Watt D. Newton
2 answers
asked by
Help
588 views
A 250.0 kg roller coaster has 2.000 x 10^4 Joule of potential energy at the top of the hill , if the track is frictionless ,
1 answer
asked by
Kizzy
695 views
1.) How much energy does a 60 W light bulb consume in 1 hour?
2.) Beth pulled her brother (m=85 kg) in a 10 kg sled with a
2 answers
asked by
Isis
557 views
how far was a box moved if 558.6 joules of work was done when a force 126Newtons was exerted to move the box?
1 answer
asked by
Guadalupe
841 views
If 150 kj of energy in used in accelerating a load of 1.5 tones at the rate of 0.56 m/s . Calcukate the distance of the load
1 answer
asked by
jignesh
347 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