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mixer [17]
4 years ago
10

If the total dissipated power is to be reduced by 10%, how much should the voltage be reduced to maintain the same leakage curre

nt? note: power is defi ned as the product of voltage and current
Physics
1 answer:
Mandarinka [93]4 years ago
5 0
Let
I₁ = initial current, A
V₁ = initial voltage, V

The power is
P₁ = I₁*V₁  W

If P is reduced by 10% and the current is kept the same, then 
P₂ = 0.9P₁
I₂ = I₁

The new voltage, V₂, is given by
P₂ = I₂V₂
0.9P₁ = I₁V₂
0.9I₁V₁ = I₁V₂
V₂ = 0.9V₁

Answer: The voltage should be reduced by 10%
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solution:

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3 0
3 years ago
At 13:20 on the last Friday in September, 1989 a frantic call was received at the local police station. There had been a serious
astraxan [27]

The kinematics and conservation of momentum relationships allow to find the results for the questions about the measurements and conditions to know the accident conditions are:

     1) The principles of conservation of momentum  and kinematics.

     2)  \theta = tan^{-1} \frac{P_{01}}{p_{02}}

     3) The factors that influence the direction and distance traveled are:

         The initial speed of the vehicles

         The mass of the vehicles

         Pavement conditions: dry, wet, humid, with dirt or loose sand.

1) Kinematics studies the movement of bodies, they look for relationships between position, speed and acceleration.

To analyze the accident, you must answer a question such as what speed the vehicles had before the accident, this is the initial speed of each one and their directions.

When reviewing the kinematics relationships we have.

        v^2 = v_o^2 - 2 a x  

Where the acceleration is given by Newton's second law.

        fr = m a

The friction force is given by the expression.

       fr = μ N  

       fr = μ mg

       

Let's Substitute.

         μ m g = m a

         a = μ g

The friction coefficient is tabulated, for different types of rubber, pavement and wet,  dry conditions, etc.

Therefore, the researcher must measure the braking distance of the vehicles, which can be taken from the mark of the tires on the road and note the condition of the pavement if it is dry or wet and the visibility of the day.

This is the speed of the vehicles just after the impact, using the law of conservation of momentum you can find the speed of the vehicles before the impact

        p_o = p_f \f

         

Where this is a vector expression, which in general is solved with the components of each directional.

Consequently to answer the questions you must use the principles of conservation of momentum  and kinematics.

2) If the vehicles travel at right angles and their masses are similar, the direction after the collision  in each direction.

           tan \theta = \frac{p_{01}}{p_{02}}  

           \theta = tan ^{-1} \frac{p_{01}}{p_{02}}  

3) The factors that influence the direction and distance traveled are:

     The initial speed of the vehicles

     The mass of the vehicles

     Pavement conditions: dry, wet, humid, with dirt or loose sand.

In conclusion, using the kinematics and conservation of momentum relationships, we can find the answers to the question about measurements and conditions to know the accident conditions are:

      1) The principles of conservation of momentum  and kinematics.

     2)  \theta = tan^{-1} \frac{P_{01}}{p_{02}}

     3) The factors that influence the direction and distance traveled are:

         The initial speed of the vehicles

         The mass of the vehicles

         Pavement conditions: dry, wet, humid, with dirt or loose sand.

Learn more about kinematics and momentum here:   brainly.com/question/17304001

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The correct answer is 8 meters. 
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The final velocity is 5.2^2. The initial velocity is 0 . You are using Kinematic equation 3. (V^2=Vo^2+2a(x)) . (5.2^2=2(2.8)x)
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3 years ago
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