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PolarNik [594]
2 years ago
12

No work is said to be done by standing man carrying 500kg load.why?​

Physics
1 answer:
Juli2301 [7.4K]2 years ago
7 0

Answer:

no work is said to be done by standing man carrying 500kg load because

Explanation:

for the work to be done there should be two conditions i.e force should be applied and displacement must be covered.So for a man carring a 500 kg load force is there but he covers no distance by standing so displacement will be zero and since

work =force\displacement

displacement is zero so we can say that no work is done

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What must the condition of the alveoli be in order for gas exchange to occur
aliya0001 [1]

Answer:

There are 5 main conditions of the alveoli for proper gaseous exchange to in the lungs.

Explanation

Alveoli is found in the lungs of mammals, birds and reptiles. It is the part of the lungs where gaseous exchange really occurs.

Alveoli has a shape of that of balloon but indeed smaller than the real balloon. It allows the passage of oxygen and carbon dioxide

The five main conditions includes:

  1. The Alveoli must have large surface to volume ratio which increase the gases that could be exchanged
  2. The wall must be thin. This can shorten diffusion distance.
  3. Alveoli must be very moist so that oxygen and carbon dioxide can pass through the solution
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8 0
3 years ago
A worker on the roof of a house drops his 0.46 kg hammer, which slides down the roof at constant speed of 9.88 m/s. The roof mak
nekit [7.7K]

Answer:

The horizontal distance travelled in that time lapse is 12.94 m

Explanation:

In order to solve this problem, we'll need:

  1. The horizontal speed
  2. the time the hammer takes to fall from the roof to the ground

At the lowest point of the roof, the hammer has a 9.88 m/s speed that makes an angle of 27° with the horizontal, so we can calculate the horizontal and vertical speed with trigonometry. If we take right as x positive and down as y positive we get

v_{x}=v*cos(27)=9.88 m/s *cos(27)=8.80 m/s \\v_{y}=v*sen(27)=9.88 m/s *sen(27)=4.49 m/s

Now, we make two movement equation as we have a URM (no acceleration) in x and an ARM (gravity as acceleration) in y. We will wisely pick the lowest point of the roof as the origin of coordinates

x(t)=8.8 m/s *t

y(t)=4.49m/s*t+\frac{1}{2}*9.8m/s^{2}*t^{2}

Now we calculate the time the hammer takes to get to the floor

17.1m=4.49m/s*t+\frac{1}{2}*9.8m/s^{2}*t^{2}\\t=1.47s or t=-2.38s

Now, we keep the positive time result and calculate the horizontal distance travelled

x(1.47s)=8.8m/s*1.47s=12.94m

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3 years ago
Given the 1-m stick shown below, which is held by a thread at its center. Block 1 is 15 N held at the 10 cm mark, while block 2
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7 0
2 years ago
Plzz Help easy quesion for 20 points Why does someone get burned if they touch an old filament bulb that has been on for a few h
fgiga [73]
Incandescent lights get hot very quickly and therefore can easily burn u or catch fire
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A cell phone is released from the top with the speed of 10ms what is the speed 3s after?
sergeinik [125]

Answer:

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Explanation:

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