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3 years ago

What happens to the force needed to stretch a rubber band when putting it on a stack of papers?

Physics

2 answers:

zmey [24]3 years ago

4 0

Answer:the force is needed to stretch it farther.

Explanation: the definition of force is push or pull so imagine stretching a rubber band your pulling the band which means you increase the force.

Ainat [17]3 years ago

3 0

Answer:

The rubber band works as a spring, so the force that you need to stretch it would be equal to:

F = X*k where X is the change in the perimeter of the rubber band and k is a constant of the rubber band.

So you need to apply force to stretch it, and when you put it again in the stack of papers, the stack of papers applies a normal force against the rubber band that keeps the rubber band a little bit stretched.

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What amount of heat is required to raise the temperature of 25 grams of copper to cause a 15ºC change? The specific heat of copp

Lina20 [59]

The amount of heat required is B) 150 J

Explanation:

The amount of heat energy required to increase the temperature of a substance is given by the equation:

$Q=mC\Delta T$

where:

m is the mass of the substance

C is the specific heat capacity of the substance

$\Delta T$ is the change in temperature of the substance

For the sample of copper in this problem, we have:

m = 25 g (mass)

C = 0.39 J/gºC (specific heat capacity of copper)

$\Delta T = 15^{\circ}C$ (change in temperature)

Substituting, we find:

$Q=(25)(0.39)(15)=146 J$

So, the closest answer is B) 150 J.

Learn more about specific heat capacity:

brainly.com/question/3032746

brainly.com/question/4759369

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3 years ago

Identify the energy transformations in the following actions.

Artemon [7]

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3 years ago

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Visible light waves are ______ waves<br> A.mechanical <br> B.electromagnetic

motikmotik

B.Electromagnetic
explanation:

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3 years ago

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Lana71 [14]

$U = R * I \rightarrow U = 10 * 5 = 50 V$