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Kryger [21]
3 years ago
7

What direction does tangential velocity point?

Physics
1 answer:
dmitriy555 [2]3 years ago
3 0

Answer:b.outward in a straight line tangent to the circle!

Explanation:at any given point on the circle is always along the tangent line.

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A machine has mechanical advantages 2, what does it means.<br> plzz tell me the ans
Vlad [161]

Answer:

Mechanical advantage is the measure of the force amplification achieved by using a tool , mechanical device or machine . ... So MA = 2 means that for example if you apply 100 N then your machine will multiply that force and generate 200 N..

Explanation:

Hope it helps you..

Your welcome in advance..

(ㆁωㆁ)

3 0
3 years ago
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
3 years ago
What is the resistance of a rheostat coil, if 0.05 A of current flows through it when 6 V is applied
AfilCa [17]

Answer:

i have no idea i came here to find out too :(

Explanation:

8 0
3 years ago
An object falls freely for 25 seconds, what is the velocity after the 25 seconds ?
Andrei [34K]
The acceleration of gravity on Earth is 9.8 m/s² downward.
This means that gravity adds 9.8 m/s downward to the speed
of a freely falling object every second.

So after 25 sec, it's falling (25 x 9.8m/s) = 245 m/s faster than
it was falling at the beginning of the 25 seconds.

If it dropped from rest (no speed), then its velocity
after 25 seconds is 245 m/s downward. 
5 0
3 years ago
Two metal bars experience an equal change in volume due to an equal change in temperature. The first bar has a coefficient of ex
maksim [4K]

Answer:

The original volume of the first bar is half of the original volume of the second bar.

Explanation:

The coefficient of cubic expansivity of substances is given by;

γ = ΔV ÷ (V_{1}Δθ)

Given: two metal bars with equal change in volume, equal change in temperature.

Let the volume of the first metal bar be represented by V_{1}, and that of the second by V_{2}.

Since they have equal change in volume,

ΔV_{1}  = ΔV_{2} = ΔV

For the first metal bar,

2γ = ΔV ÷ (V_{1}Δθ)

⇒    Δθ =  ΔV ÷ (2γV_{1})

For the second metal bar,

γ = ΔV ÷ (V_{2}Δθ)

⇒  Δθ = ΔV ÷ (V_{2}γ)

Since they have equal change in temperature,

Δθ of first bar = Δθ of the second bar

ΔV ÷ (2γV_{1})     =   ΔV ÷ (V_{2}γ)

So that;

(1 ÷ 2V_{1}) = (1 ÷ V_{2})

2V_{1} =  V_{2}

V_{1} = \frac{V_{2} }{2}

Thus, original volume of the first bar is half of the original volume of the second bar.

8 0
4 years ago
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