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Alexxandr [17]
3 years ago
10

For work to be accomplished we must have

Physics
2 answers:
Nat2105 [25]3 years ago
8 0
The answer they are looking for is the last one. However the last two are technically correct but the third one would result in negative work.
Sunny_sXe [5.5K]3 years ago
8 0

Answer:

a force and a movement in the same direction as the force.

Explanation:

As we know that the formula to find the work done is given by

W = \vec F. \vec d

here if the force is applied at some angle with displacement then in that case

W = F d cos\theta

now we know that if the force and displacement is in opposite direction then the work done is negative while if the force and displacement is in same direction then the work done is positive

So work to be accomplished only when the sign of the work done is positive so it must be in the same direction as that of displacement of the object

so correct answer would be

a force and a movement in the same direction as the force.

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Shopping mall has the largest volume
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Answer:

40m (40m east)

Explanation:

The fist move is 70m east, and east is the positive direction so the truck initially is at +70m.

The second move is 120m to the west, since east is the positive direction, west must be the negative direction, this means the truck now is at:

+70m -120m = -50m

The third move is 90m to the east, again, this is the positive direction, so the new position is:

-50m + 90m = +40m.

The truck is at + 40m, so it ended up 40m away from its initial position and this is the resultant dispacement.

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3 years ago
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This question involves the concepts of the law of conservation of energy, potential energy, and kinetic energy.

The data shown by the bar graph is "valid".

According to the law of conservation of energy, the total energy of the system must remain constant at any given point. Hence, the sum of the kinetic energy and the potential energy of the roller coaster must be constant at any given time.

Considering the bottom of the first hill:

Total Energy at 1st Hill = Kinetic Energy + Potential Energy

From the data given in the bar graph:

Total Energy at 1st Hill = 2,500,000 J + 0 J (since at the bottom potential energy is zero due to zero height)

Total Energy at 1st Hill = 2,500,000 J

Now, considering the top of the second hill:

Total Energy at 2nd Hill = Kinetic Energy + Potential Energy

From the data given in the bar graph:

Total Energy at 2nd Hill = 1,000,000 J + 1,500,000 J

Total Energy at 2nd Hill = 2,500,000 J

Hence,

Total Energy at 1st Hill = Total Energy at 2nd Hill

Therefore, the given bar graph is "valid".

Learn more about the law of conservation of energy here:

brainly.com/question/20971995?referrer=searchResults

The attached picture explains the law of conservation of energy.

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Akimi4 [234]

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A battery charges a parallel-plate capacitor fully and then is removed. The plates are immediately pulled apart. (With the batte
Assoli18 [71]

Answer:

<em>There will be an increase in potential difference.</em>

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In addition to that the potential difference can also be defined as the product of field and distance between the plates. As the charge is constant so the field is constant. Upon increasing the separation between the plates the potential difference will also increased.

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