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vaieri [72.5K]
3 years ago
6

If a force does a positive amount of work on an object, does the object's speed

Physics
1 answer:
Alexxandr [17]3 years ago
8 0

The speed of the object increases

Explanation:

We can answer this question by applying the work-energy theorem, which states that the work done on an object is equal to the change in kinetic energy of the object. Mathematically:

W=K_f -K_i= \frac{1}{2}mv^2-\frac{1}{2}mu^2

where

W is the work done on the object

K_f, K_i are the final and initial kinetic energy of the object, respectively

m is the mass of the object

v is its final speed

u is its initial speed

In this case, the force does a positive amount of work on the object, so

W>0

This also implies that

K_f > K_i

And so

\frac{1}{2}mv^2 > \frac{1}{2}mu^2

And therefore

v>u

which means that the speed of the object increases.

Learn more about  work:

brainly.com/question/6763771

brainly.com/question/6443626

#LearnwithBrainly

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a wire of a certain material has resistance r and diameter d a second wire of the same material and length is found to have resi
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Answer:

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Explanation:

Using the formula for calculating the resistivity of an object to find the diameter.

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L is the length of the material

Since A = πd²/4

P = R( πd²/4)/L

P = Rπd²/4L ... 1

If the second wire of the same material and length is found to have resistance R/9, the resistivity of the second material will be;

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P₂ = (R/9)(πd₂²/4)/L₂

P₂ = (Rπd₂²/36)/L₂

P₂ = (Rπd₂²)/36L₂

Since the length and resistivity are the same;

P = P₂  and L =L₂

Equating 1 and 2;

Rπd²/4L =  (Rπd₂²)/36L₂

Rπd²/4L =  (Rπd₂²)/36L

d² = d₂²/9

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Taking the square root of both sides;

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Therefore the diameter of the second wire is 3 times that of the initial wire

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Answer:

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where vo is the initial velocity, a is the acceleration and tel time

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