<span>Law of Conservation of Energy states that the total amount of energy remains constant in an isolated system and Energy can be neither created nor destroyed.
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Therefore,
<span>The refrigerator</span><span> removed 272 Joules of energy from the food (making it colder) and dumped 272 J of energy outside (heat of the refrigerator).</span>
240 cos 30 - 41.5 = 30a
240*1/2 - 41.5 = 30a
120 - 41.5 = 30a
30a = 78.5
a = 78.5/30 = 2.62 m/s^2
The type of pure substances that can create elaborate structures is :
( D ) Atoms that are not attracted to each other because they will stay still and end up laying on top of each other.
<h3>What is an Elaborate structure ?</h3>
An elaborate structure is a complex structure formed by the combination of different unrelated parts. Atoms that are un attracted to each other are made of different parts therefore when they come together they will lay on each other, forming an elaborate structure which is complex in nature.
Hence we can conclude that the type of pure substance that can create elaborate structures is Atoms that are not attracted to each other because they will stay still and end up laying on top of each other.
Learn more about elaborate structure: brainly.com/question/508618
When a man pushes a box across a floor, as he increases the force he applies horizontally to the box, then the kinetic friction remains the same.
To find the answer, we need to know about friction.
<h3>What is friction?</h3>
- Whenever a body moves, over the surface of another body, a force comes into play which acts parallel to the surface of contact and opposes the relative motion. This opposing force is called friction.
- There are two frictions acting on a surface.
- Static friction: It come into play between two bodies before when it starts moving. Self-adjusting force and the max value of it is called limiting static friction.
- Kinetic friction: It come into play between two bodies when it starts moving. It is not a self-adjusting force.
- As we increase applied force, kinetic friction will remain same.
Thus, we can conclude that, kinetic friction remains the same when we increase the applied force.
Learn more about the friction here:
brainly.com/question/28048527
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