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3 years ago

7

Before railroad were invented, goods often traveled along canals, with mules pulling barges from the bank. If a mule is exerting

a 12,000N force for 10km, and the rope connecting the mule to the barge is at a 20 degree angle from the direction of travel, how much work did the mole do on the barge?
A. 12MJ
B. 11MJ
C. 4.1MJ
D. 6MJ

1 answer:

morpeh [17]3 years ago

8 0

Answer:

W = 112.76MJ

Explanation:

the work is:

$W = F_xD$

where $F_x$ is the force executed in the direction of the displacement and the d the displacement.

so:

W = 12000Ncos(20)(10000)

we use the cos of the angule because it give us the proyection in the axis x of the force, that means the force in the direction of the displacement.

W = 112.76MJ

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In other words the acceleration can be described as

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At the same time since Newton's second law we know that:

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$dF_W = -2F_W(\frac{dr}{r})$

But we know that the total weight (F_W) is equivalent to 600N, and that the change during each mile in kilometers is 1.6km or 1600m therefore:

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A student jumps off a sled toward the NORTH after it stops at the bottom of an icy hill. Based on Newton's third law of motion,

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When the student the sled jumps off toward the north , the sled most likely move towards the south.

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According to the Newton third law of motion, action and reaction are equal and opposite. This means that the direction of the reaction force must also be opposite to that of the action.

As such, when the student the sled jumps off toward the north , the sled most likely move towards the south.

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1 year ago

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Answer:

In order of increasing wavelength, the answer is:

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First, you have to know that the wavelength of a sinusoidal wave traveling at a constant speed is given by:

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Where λ is the wavelength, $v$ is the constant speed and $f$ is the wave's frequency. In the case of electromagnetic radiation in free space, the constant speed is the speed of light.

From explained above, you can conclude that there is a proportionality relationship between the wavelength and the frequency, they are inversely proportional. That means: the highest frequency will have the shortest wavelength and vice-versa.

So, you have the following types:

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