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Law Incorporation [45]
3 years ago
13

A spring with a rest length of 0.7 m has a spring constant of 70 N/m. It is stretched and now has a length of 2.5 m. What is the

potential energy stored in the spring?
____ J
Physics
1 answer:
pentagon [3]3 years ago
7 0

Answer:

<em>113.4 J</em>

Explanation:

<u>Elastic Potential Energy</u>

Is the energy stored in an elastic material like a spring of constant k, in which case the energy is proportional to the square of the change of length Δx and the constant k.

\displaystyle PE = \frac{1}{2}k(\Delta x)^2

The spring has a natural length of 0.7 m and a spring constant of k=70 N/m. When the spring is stretched to a length of 2.5 m, the change of length is

Δx = 2.5 m - 0.7 m = 1.8 m

The energy stored in the spring is:

\displaystyle PE = \frac{1}{2}70(1.8)^2

PE = 113.4 J

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Answer:

0.0675 seconds

Explanation:

From the question,

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Substitute these value into equation 2

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7 0
3 years ago
the wattage ratting of a light bulb is the power it sonsumers when it is connected accross a 120 V potential difference what is
igor_vitrenko [27]

Answer:

240 Ω

Explanation:

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The expression for resistance power and voltage is give as,

P = V²/R.......................... Equation 1

Where P = Power, V = Voltage, R = Resistance

Making R the subject of the equation,

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Given: V = 120 V, P = 60 W.

Substitute into equation 2

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Hence the resistance of the bulb = 240 Ω

8 0
3 years ago
How much force is needed to cause a 15 kilogram bicycle to accelerate at a rate of 10
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