A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?A. The mass of the balloon increases because the size of the balloon has increased.

B. The mass of the balloon increases because the temperature of the balloon has increased.

C. The mass of the balloon stays the same because the gas inside the balloon still has same mass after it warms up.

D. The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing the size.


  Please explain why you chose your answer

Answers

Answer 1

Answer: A). No. Mass doesn't just appear out of thin air. The total amount of mass never changes, no matter what you do to it.

B). No. Same reason as (A).

C). Yes. The total amount of mass never changes, no matter what you do to it.

D). No. The amount of mass never changes, no matter what you do to it.

Answer 2

Answer: C is the correct answer

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What is the zero error of this vernier caliper ???

Answers

I believe the answer is C. 0.14cm.
The zero error in vernier caliper is read by the distance by which the zero of the movable part of the scale is shifted from the zero of the cm ruler in the tool, which is the unmovable part of the tool. The movable part has a scale accuracy of 0.1 cm, while the other has a scale accuracy of 1 cm. And we always use the lowest scale, which is here the 0.1 scale which has greater accuracy with 10 times the 1 cm ruler, to find our errors.

Hope this helps!

A Carnot heat engine has an efficiency of 0.400. If it operates between a deep lake with a constant temperature of 298.0k and a hot reservoir, what is the temperature of the hot reservoir?

Answers

Answer:

496.7 K

Explanation:

The efficiency of a Carnot engine is given by the equation:

$\eta = 1 - (T_H)/(T_L)$

where:

$T_H$ is the temperature of the hot reservoir

$T_C$ is the temperature of the cold reservoir

For the engine in the problem, we know that

$\eta = 0.400$ is the efficiency

$T_C = 298.0 K$ is the temperature of the cold reservoir

Solving for $T_H$ , we find:

$(T_C)/(T_H)=1-\eta\nT_H = (T_C)/(1-\eta) =(298.0)/(1-0.400)=496.7 K$

Please help me on this I know it’s not B this stuff is kinda hard for me

Answers

There you go again. Newton's 3rd Law says "for every action there is an EQUAL OPPOSITE reaction.".

EQUALand OPPOSITE

If THIS MUCH force pushes the bullet THAT way, then THE SAME amount of force pushes the rifle THIS way.

The bullet pushes backward on the rifle with the same amount of force as the rifle exerts on the bullet.

Which jobs use electromagnets?

Answers

Auto mechanics use them for both electric and hybrid cars, MRI technicians use them to look inside a patient's body when giving them an MRI scan, and robotic engineers use them also where the electromagnets power the motor and cause the robot to move.

Is the formation of rust on an iron nail a chemical change or a physical change? Explain your answer.

Answers

The formation of rust or the iron oxide, is by the chemical reaction between iron and atmospheric oxygen. Hence, it is a chemical change involving the formation of new product.

What is a chemical change?

A chemical change is accompanied by the making or breaking or chemical bonds and the formation of new products. Whereas, a physical change does not involve the change in chemical bond. Phase transitions, change in size,shape etc. are physical changes.

The rust formed in the iron material is iron oxide or Fe₂O₃. This process of forming rust by the action of air or water is called corrosion. Iron reacts with atmospheric oxygen or oxygen from water forms the rust.

The formation of rust makes the material destroy and to prevent this process some anticorrosive materials have to be applied. Hence, formation of rust is a chemical change.

To find more on corrosion, refer here:

brainly.com/question/489228

#SPJ2

it is a chemical change because you cannot undo rusting and a new substance- the rust- is formed

When electric current flows through the metal element of a light bulb, electrical current energy is converted to

Answers

-- light energy (the whole purpose of current through the bulb)

-- heat energy (it can't be avoided)

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Bone-strengthening physical activity done _____ increases bone-mineral content and bone density in youth.

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