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labwork [276]
2 years ago
7

In order to move a bag of dog food across a room that measures 8 meters in length, you apply 10 Newtons of force. How much work

was done?
Physics
1 answer:
Lady bird [3.3K]2 years ago
7 0

Answer:

80 joules of work

Explanation:

Use W=F·d

W=10N(8M)= 80 Joules

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The kinetic energy of a moving object is E=12mv2. A 61 kg runner is moving at 10kmh. However, her speedometer is only accurate t
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Answer:

e=3367.2J

%e=1.43%

Explanation:

From the exercise we know two information. The real speed and the experimental measured by the speedometer

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Since the speedometer is only accurate to within 0.1km/h the experimental speed is

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Knowing that we can calculate Kinetic energy for the real and experimental speed

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E_{e}=\frac{1}{2}mv^2=\frac{1}{2}(61000g)(2.75m/s)^2=230656J

Now, the potential error in her calculated kinetic energy is:

e=E_{r}-E_{e}=(234023-230656)J=3367.2J

%e=\frac{E_{r}-E_{e}}{E_{r}}x100=\frac{(234023-230656)J}{234023J}x100=1.43%

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