Consider a system consisting of the Earth, a vertical spring attached to the Earth, and a mass attached to the other end of the spring. Beginning with the mass hanging in its equilibrium position, a human grips the mass and pulls it down by some distance and holds the mass at rest. How does conservation of energy apply to this action?
Solved
Show answers
More tips
- A Auto and Moto What is the Average Lifespan of an Engine in a Car?...
- P Photography and Videography Understanding HDR: How It Works and Why You Need It...
- P Photography and Videography How to Choose the Perfect Photo Paper for Your Images?...
- C Computers and Internet How to Choose an Uninterruptible Power Supply (UPS) for Your Computer: Expert Tips...
- S Science and Technology How to choose a home theater system?...
- A Auto and Moto How to Choose a Car Wash? Tips and Recommendations...
- A Animals and plants How ants survive winter: exploring the secrets of their winter life...
- C Construction and repair How to Choose the Best Underfloor Heating?...
- S Sport When is the Champions League final?...
- S Sport When and Where Will the 2014 World Cup be Held?...
Answers on questions: Physics
- P Physics Rupaul drag race is my favorite tv show who is your favorite drag queen?...
- P Physics A train travels at a constant 3.5 m/s with a thurst force of 300 N. If the train has a weight of 14,000 Newtons, what is the train s normal force? Ignore friction. a. 86 kg b. 300...
- P Physics Worried that your cat may be ambushed by a mountain lion, you build a fence around your backyard that is 4 m tall. If a mountain lion approaches the fence and leaps at an angle of...
- P Physics Explain what is the difference of physical and chemical weathering...
- P Physics A car of mass 625 kg is driving down the road at a velocity of 24 m/s. The driver gets stung by a bee and brakes hard, skidding to a stop over a distance of 18 m. Calculate the magnitude...
- P Physics Rita is riding a 7.0 kilogram bike at a velocity of 15 meters/second. rita’s mass is 42 kilograms. what is her momentum?...
- P Physics If you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings, the balls will swing A) toward each other. B) apart from each other. C) away from the air stream....
- H History How did Winston Churchill’s iron curtain speech impact the Truman Doctrine...
- E English What is the definition of mendacious...
- M Mathematics Your answer should be a polynomial in standard form (3b – 4)(b + 2)...
Ответ:
The external force leads to an increase on gravitational and spring potential energies.
Explanation:
The system consists of a mass, resort and Earth. According to the Principle of Energy Conservation there is a potential energy as a consequence of the interaction between Earth and the mass and spring potential energy because of the spring deformation and, besides, the existence of work due to an external force:
The external force leads to an increase on gravitational and spring potential energies.
Ответ:
The gravitational potential energy was not only converted to elastic potential energy, but the positive work the human did on the system also added to the increase in elastic potential energy.
Explanation:
Let's first of all choose our system to consist of the block, spring, and Earth.
By choosing the Earth and block to be in the system, we will have a change in gravitational potential energy.
Now, in the beginning, the spring hangs vertically with a block of mass (m) attached at the bottom.
During the pulling process by the human, he is doing positive work on the system and this means that the energy in the system increases.
Let's now use the work-energy theorem to answer the question of where the gravitational potential energy goes;
W_net,external = ΔE_total = -ΔU_gravity + ΔU_elastic
So, we see the gravitational potential energy decreases. However, the only other term that could compensate for this decrease in gravitational potential energy is the increase in elastic potential energy.
The spring did not store gravitational potential energy but instead, the gravitational potential energy was converted to elastic potential energy.
From the work energy theorem equation above, since the left-hand side is positive, the absolute value of ΔU_elastic would be greater than that of ΔU_gravity.
Therefore, we see that the gravitational potential energy was not only converted to elastic potential energy, but the positive work the human did on the system also adds to the increase in elastic potential energy.
Ответ:
Me please
Explanation: