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Anastaziya [24]
4 years ago
9

What is the best definition for work?

Physics
1 answer:
olga55 [171]4 years ago
7 0

Work is done when a force is in the same direction as the object moves.

Explanation:

The work done by a force in moving an object is given by the equation

W=Fd cos \theta

where

F is the magnitude of the force

d is the displacement of the object

\theta is the angle between the directions of F and d

From the equation, we notice the following:

  • Work is done by a force when the force is in the same direction as the object moves. In fact, in this case, \theta=0^{\circ}, and so cos \theta = 1, which means that the work done simply becomes W=Fd
  • When the force is perpendicular to the motion of the object, \theta=90^{\circ} and cos \theta = 0, which means that no work done
  • Technically, work is also done when the force is not parallel to the motion of the object: in this case, the factor cos \theta means that only the component of the force parallel to the direction of motion contributes to do work on the object.

Therefore, the correct answer is

Work is done when a force is in the same direction as the object moves.

Learn more about work:

brainly.com/question/6763771

brainly.com/question/6443626

#LearnwithBrainly

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3 years ago
330 g of water at 55°c are poured into an 855 g aluminum container with an initial temperature of 10°
Olenka [21]
The final temperature of the system is 32.5°
we know,  H = mcT 
where, H = Heat content of the body 
m = Mass,
c = Specific heat
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According to to the Principle of Calorimetry 

The net heat remains constant i.e. 
⇒ the heat given by water = heat accepted by the aluminum container.
⇒ 330 x 1 x (45 - T) = 855 x \frac{900}{4200} x (T - 10) 

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3 years ago
Which of the following was NOT a department in Washington's first cabinet?
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Explanation:

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At an air show a jet flies directly toward the stands at a speed of 1200 km/h, emitting a frequency of 3500 Hz, on a day when th
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Answer:

(a): The frequency received by the observers is f'= 138,062.28 Hz.

(b): When the plane flies directly away from them, they receive a frequency of f'= 1772.46 Hz.

Explanation:

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Vo= 0 m/s

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