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3 years ago

How much heat is required to melt 86.5 g of ice at its melting point?

1 answer:

8 0

The ice is already at melting point, therefore we don't need additional heat to increase its temperatute. Instead, we have to give it the necessary heat to melt it, and the amount of this heat is given by
$Q=m L_f$
where
m is the mass of the ice
Lf is the latent heat of fusion of ice
For ice, $L_f = 334 J/g$ , while the mass of this sample of ice is $m=86.5 g$ , therefore the amount of heat needed to melt it is
$Q=mL_f = (86.5 g)(334 J/g)=2.89 \cdot 10^4 J = 28.9 kJ$

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Gravitational acceleration for the bodies falling freely is

STatiana [176]

Answer:

g= 9.81m/s..................

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3 years ago

The spheres are connected by a uncharged teflon rod. what is the charge on the left sphere after the charged plastic rod touches

vodomira [7]

The charge on the left sphere negatively charged.

<h3 /><h3>What is charge?</h3>

Due to the physical property of electric charge, charged material experiences a force when it is subjected to an electromagnetic field. You might be electrically positive or negative. While similar charges repel one another, opposite charges attract.

In order for the neutral metal sphere and negatively charged metal rod to have the same potential, some negative charge must flow from the rod to the sphere in order for them to both have negative charges.

The sum of the negative charges in them would be equal to the initial negative charge in the rod since the entire charge is preserved.

to learn more about charge go to -

brainly.com/question/18102056

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2 years ago

A 110 kg football player running with a velocity of 5.0 m/s hits another stationary football

KengaRu [80]

Answer:

The final velocity of the second player is 6.1 m/s.

Explanation:

The final velocity of the second player can be calculated by conservation of linear momentum (p):

$p_{i} = p_{f}$

$m_{a}v_{a_{i}} + m_{b}v_{b_{i}} = m_{a}v_{a_{f}} + m_{b}v_{b_{f}}$ (1)

Where:

$m_{a}$ : is the mass of the first football player = 110 kg

$m_{b}$ : is the mass of the second football player = 90 kg

$v_{a_{i}}$ : is the initial velocity of the first football player = 5.0 m/s

$v_{b_{i}}$ : is the initial velocity of the second football player = 0 (he is at rest)

$v_{a_{f}}$ : is the final velocity of the first football player = 0 (he stops after the impact)

$v_{b_{f}}$ : is the final velocity of the second football player =?

By solving equation (1) for $v_{b_{f}}$ we have:

$110 kg*5.0 m/s + 0 = 0 + 90 kg*v_{b_{f}}$

$v_{b_{f}} = \frac{110 kg*5.0 m/s}{90 kg} = 6.1 m/s$

Therefore, the final velocity of the second player is 6.1 m/s.

I hope it helps you!

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3 years ago

Energy is transmitted only in indivisible discrete quantities. True or False

alex41 [277]

Answer:

False

Explanation:

From the fact that light is emitted in portion, it does not follow that light ray is discrete in structure.

The way Einstein put it was that if a beer is always sold in pint bottles, that does not mean that beer contain of indivisible pint bottles. Yet experiments in which light knocked electrons out of materials insistently made the point that light is absorbed only in the form of discrete portions. An emitted portion or quantum of light energy retains it's individuality in subsequent events as well.

This concept was first stated by Einstein in 1905. From the heuristic point of view that he developed light is always made up of discrete portions possessing energy and momentum.

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3 years ago

Describe the role of the grass in the food web

Crank

Grass is a producer. It gets its energy from the sun, which i might add is by a process called,"photosynthesis", meaning the grass makes its own food. With this bew energy an animal such as a rabbit comes to eat it, that energy that the grass collected is now the rabbits.

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3 years ago