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solniwko [45]
3 years ago
11

A 30.0 kg packing crate in a warehouse is pushed to the loading dock by a worker who applies a horizontal force. The coefficient

of kinetic friction between the crate and the floor is 0.20. The loading dock is 15.0 m southwest of the initial position of the crate. (a) If the crate is pushed 10.6 m south and then 10.6 m west, what is the total work done on the crate by friction? (b) If the crate is pushed along a straight-line path to the dock, so that it travels 15.0 m southwest, what is the work done on the crate by friction?
Physics
1 answer:
Sergio [31]3 years ago
6 0

Answer:

a) 1272J

b) 900J

Explanation:

In order to calculate work, we need the magnitude of the friction and the distance the crate moved. For part a) the distance is the sum of 10.6m + 10.6m and for part b) it is 15m. So now we just need the magnitude of the friction.

We know that Fr = μ*N  where N = m*g, so:

Fr = μ * m * g    Replacing the values, we get Fr = 0.2*30*10 = 60N

With this magnitude we can now calculate the work:

W1 = Fr * d1 + Fr * d2 = 60*10.6 + 60*10.6 = 636J + 636J = 1272 J

And now through the straight line:

W2 = Fr * d = 900J

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Mostly yes

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2 years ago
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Think of a scenario where an authoritarian leadership style would be beneficial. Explain. What are the reasons it would work wel
icang [17]

Answer:

Explanation:

A scenario in which an authoritarian leadership would be beneficial is in law enforcement in emergency cases (that has to do with public safety or national security) without the bureaucratic bottlenecks of the legislature and judiciary. For example, the recent coronavirus pandemic, authoritarian leaderships would find it easier to enforce the laws on wearing of masks and also prevent producers of personal protective equipment (PPE) from unreasonably inflating prices of there PPEs.

As explained above, it would work well because there will be no legislative bottleneck that will start a hearing at the expense of public safety neither will there be a court that will stall the process at the same expense.

The risks here is that businesses (in this case that of producing PPEs) may find it difficult to survive since the "tone" of the pricing of PPEs will now be determined by government. It may even hinder healthy business competition. It may also lead to production of substandard PPEs in order to generate enough profit (since the main aim of any business is to generate profit).

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3 years ago
The bonds of oxygen molecules are broken by sunlight. The minimum energy required to break the oxygen-oxygen bond is 495 kJ/mol.
makvit [3.9K]

Answer:

The wavelength of sunlight that can cause this bond breakage is 242 nm

Explanation:

The minimum energy of the sunlight that'll break Oxygen-oxygen bond must match 495 KJ/mol

But 1 mole of any molecule contains 6.02 × 10²³ molecules/mol

Each molecule of Oxygen will require (495 × 10³)/(6.02 × 10²³) = 8.22 × 10⁻¹⁹ J

E = hf

v = fλ

f = v/λ

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λ = wavelength of the sunlight

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E = hv/λ

λ = hv/E

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Are there conditions under which the incident light ray undergoes reflection but not transmission at the boundary? if so, then w
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<h3>What is total internal reflection?</h3>

The term total internal reflection occurs when light is moving from a denser to a less dense medium such as from glass to air. This phenomenon occurs at the interface between the two media.

There are two conditions necessary for total internal reflection and they are;

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6 0
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storchak [24]
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To find the average velocity, you must divide the distance by the change in time, which should look like v=d/t

Here is how you set up the equation-
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Once you divide 6.1 meters by 8.8 seconds, you should get a number that looks like 0.69318182.... however, I just rounded it to 0.693 meters per second. You can round it to whatever you like.

Hope this helped! If you have any questions about what I mentioned in my answer or explanation, feel free to comment on my answer and I’ll try to get back to you!
8 0
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