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3 years ago

A man performed 500 j of work moving a couch in his living room

Physics

1 answer:

Sergio039 [100]3 years ago

6 0

Incomplete question. Missing part:

"it took him 10 seconds to move the couch. What was his power?"

Answer:

50 W

Explanation:

The power developed is given by:

$P=\frac{W}{t}$

where

W is the work done

t is the time taken

In this problem,

W = 500 J

t = 10.0 s

Substituting into the equation, we find

$P=\frac{500}{10}=50 W$

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1 year ago

How much force is required to accelerate 3 kg at 3 m/sec^2

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3 years ago

Find the average energy E for (a) An n-state system, in which a given state can have energy 0,,2,...,n . (b) A harmonic oscillat

kicyunya [14]

Answer:

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Explanation:

The energy values form an arithmetic series, whose sum is

S = n (a₁ + aₙ) / 2 = n (2a₁ + (n-1) r)/ 2

Where n is the number of terms, a₁ is the first term, aₙ the last term and r is the difference between two consecutive numbers in the series

r = 2E₀ - 0 = 2E₀

Therefore the sum is

S = n (0 + n E₀) / 2

S = n² E₀ / 2

The average value is

E_average = S / n

E_average = n E₀ / 2

b) the case of harmonic oscillation

We have two possibilities.

- if we take a finite number and terms gives the same previous value

- If we take an infinite number of fears the series gives infinity and the average is also infinite

E_average= infinity

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3 years ago