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STALIN [3.7K]
3 years ago
15

You see a marble sign. Its letters are too worn to read. What caused this?

Physics
1 answer:
enyata [817]3 years ago
8 0
It is called weathering. there are three different types of weathering, physical weathering, chemical weathering, and biological weathering. Your particular question is caused by chemical weathering. 
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A thin, uniform stick of mass M and length L is at rest on a flat, frictionless surface to which one end of it is pinned. A smal
labwork [276]

Answer:

a)  I = (\frac{M}{3} + \frac{4m}{9}) L²  ,   b)     w = (\frac{27 M}{18 m} + 2)⁻¹  Lv₀

Explanation:

a) The moment of inertia is a scalar that represents the inertia in circular motion, therefore it is an additive quantity.

The moment of inertia of a rod held at one end is

         I₁ = 1/3 M L²

The moment of inertia of the mass at y = L

        I₂ = m y²

 

The total inertia method

        I = I₁ + I₂

        I = \frac{1}{3} M L² + m (\frac{2}{3} L)²

        I = (\frac{M}{3} +\frac{4m}{9} ) L²

   

b) The conservation of angular momentum, where the system is formed by the masses and the bar, in such a way that all the forces during the collision are internal.    

Initial instant. Before the crash  

       L₀ = I₂ w₀  

angular and linear velocity are related  

       w₀ = y v₀  

      w₀ = \frac{2}{3}L v₀  

      L₀ = I₂ y v₀  

Final moment. After the crash  

      L_{f} = I w

 

how angular momentum is conserved  

      L₀ = L_{f}

      I₂ y v₀ = I w

substitute

      m (\frac{2L}{3})² (\frac{2L}{3} v₀ =  (\frac{M}{3} +\frac{4m}{9} ) L²  w

      \frac{6}{27}  m L³ v₀ = (\frac{M}{3} +\frac{4m}{9} ) L²  w

        \frac{6}{27}  m L v₀ = (\frac{M}{3} +\frac{4m}{9} )   w

        L v₀ = (\frac{27 M}{18 m} + 2)  w     

       w = (\frac{27 M}{18 m} + 2)⁻¹  Lv₀

 

6 0
2 years ago
Objects fall near the surface of the earth with a constant downward acceleration of 10 m/s2 . Suppose a falling object is moving
Papessa [141]

Answer:

The final velocity of the object after 2 seconds is 30 m/s

Explanation:

Given;

constant downward acceleration, a =  10 m/s²

initial velocity of the object falling down, v = 10 m/s

time of fall, t = 2 s

The final velocity of the object is given by;

v = u + at

where;

v is the final velocity

v = 10 + (10)(2)

v = 10 + 20

v = 30 m/s

Therefore, the final velocity of the object after 2 seconds is 30 m/s

3 0
2 years ago
Describe the shapes and designs that are most aerodynamic.
Bas_tet [7]
The teardrop could be an example as it was designed for that purpose, and most notably planes and such aero traveling vehicles
4 0
3 years ago
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Help me with this one aswell, too confused and tired for this
gogolik [260]
D all of the above applies to the functions of the nervous system.
7 0
2 years ago
A wire runs left to right and carries a current in the direction shown.
Step2247 [10]

Answer:

The direction of the magnetic field at point Z; Into the screen

Explanation:

8 0
3 years ago
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