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Andrei [34K]
3 years ago
15

Logow se propong by

Physics
1 answer:
Lisa [10]3 years ago
7 0

Answer:

I am very confused what your question is.

Explanation:

please clarify

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If you were trying to cross a river with the shortest possible time, would you aim your boat slightly upstream, directly across
Maru [420]
Slightly downstream for the shortest possible time
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3 years ago
If you blow up a balloon, tie it off, and release it, it will fall to the ground.
RoseWind [281]

Answer:

carbon dioxide (what you are blowing up the balloon with) is a heavy gas. so when you fill the Balloon with it, the balloon will not float. helium is a light gas and floats. gravity takes another. part in this

8 0
2 years ago
A 2.00 meter long horizontal plank whose mass is 3.00 kg is placed so that the very end (the right end) rests on a retaining wal
avanturin [10]

Answer:

R_g=\frac{61}{7} =8.7143\ N

R_w=45.1857\ N

Explanation:

Given that:

  • mass of plank, m=3\ kg
  • length of plank, l=2\ m

From the image we can visualize the given situation.

Consider the given plank to be mass-less and having a uniformly distributed mass of 1.5 kg per meter.

<u>Now in the balanced condition:</u>

  • \sum F=0

R_g+R_w=(3+2.5)\times 9.8

R_g+R_w=53.9\ N .......................(1)

  • \sum M_w=0

1.75\times R_g=3\times 1+(2.5\times 9.8)\times 0.5

R_g=\frac{61}{7} =8.7143\ N ...........................(2)

is the force acted by the tailgate on the plank.

<u>Substitute the value from (2) into (1):</u>

R_w=45.1857\ N is the force acted by the wall upon the plank.

6 0
3 years ago
At a given location the airspeed is 20 m/s and the pressure gradient along the streamline is 100 N/m3. Estimate the airspeed at
Degger [83]

Answer:

17.97m/s

Explanation:

Density of air (ρ)air=1.23 kg/m3, and

Air speed (V) =20 m/sec, pressure gradient along the streamline, ∂p/∂x = 100N/m^3.

The equation of motion along the stream line directions:

considering the momentum balance along the streamline.

γsinθ-∂p/∂x=ρV(∂V/∂x)

Neglecting the effect of gravity , then γ=ρg=0

So, ∂p/∂x= -ρV(∂V/∂x)

∂V/∂x= - 100/(20X1.23)= -4.0650407/S

Also δV/δx=∂V/∂x

∂V/∂x=-4.0650407/S and δx=0.5 m

δV = (-4.0650407/S) *(0.5m)

δV = -2.0325203 m/S

So net air speed will be V+δV= -2.0325203+20 ≅17.96748 m/s

Approximately, V+δV=17.97m/s.

8 0
3 years ago
13. Which of the following is considered to be a vector?
kompoz [17]
B velocity hope it helps
8 0
2 years ago
Read 2 more answers
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