PHYSICS MIDDLE SCHOOL

Fifteen joules of heat are added to a cylinder with a piston. The system uses 7 joules of energy to raise the piston upward. By how much did the internal energy of the system increase?

Answers

Answer 1
Answer:

Answer:

8 J

Explanation:

Heat = work + change in internal energy

Q = W + ΔU

15 J = 7 J + ΔU

ΔU = 8 J

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Hello Please Help With A couple Science questions
HELP ASAP REAL ANSWERS PLEASE You push a box across the floor with a force of 30 N. You push it 15 meters in 8 seconds. How much work did you do? How much power did you use?

How far will a block get in 1 second if it has a mass of 10 kg and is being pushed with a force of 1,703 Newtons while the kinetic coefficient of friction is 1.1?

Answers

Answer:

the answer is : 10N.,,, 5KG.

Explanation how it works:

Inertial Mass

When you compare the two laws of motion, you discover that the

first law identifies inertia as the property of matter that resists

a change in its motion; that is, it resists acceleration. The second

law gives a quantitative method of finding acceleration, but it does

not seem to mention inertia. Instead, the second law indicates

that the property that relates force and acceleration is mass.

Actually, the mass (m) used in the second law is correctly

described as the inertial mass of the object, the property that

resists a change in motion. As you know, matter has another property — it experiences a gravitational attractive force. Physicists

refer to this property of matter as its gravitational mass. Physicists

never assume that two seemingly different properties are related

without thoroughly studying them. In the next investigation, you

will examine the relationship between inertial mass and gravitational mass.
10n and fk my boy then right there

A transfer of heat within a liquid or gas that involves warm particles moving in currents isa convection.
b connection.
c correction.
d conduction.

Answers

So the question is what is a transfer of heat within a liquid or gas that involves warm particles moving in currents. So there are three mechanisms of moving heat. Those are convection, conduction and radiation. Radiation is transfering energy via electromagnetic waves. Conduction is transfering heat trough some thermal conductor. Convection is transferring heat within a liquid or gas that involves warm particless moving in currents.

THE ANSWER IS

A; convection.

In what way does varying the length of a string of a violin change the vibration and how does this affect the sound that's produced?

Answers

The wavelength is the so-called "fundamental" wavelength, or the "first mode." Thus, the wavelength of the string's vibration is defined by the supports, and has nothing whatsoever to do with mass or elasticity.

Matter and energy can convert into each other. True False

Answers

the answer is True you can convert matter and energy

TRUE!!!!!!!

HOPE THIS HELPS YOU!

Please explain as if I am a 6 year old; why is time travel theoretically impossible?

Answers

Why exactly do you mean
Time travel would create paradoxes and history could be altered, resulting in something called the "butterfly effect". This means that even the smallest of changes can result in a HUGE difference. If you traveled back in time, you would interact with people and things. This would alter history, creating massive ripples in time. The movie "Back to the Future" and the new Harry Potter book have great examples of this. Hope I answered your question!

Which statement describes between a cup if cold water and a cup of boiling water

Answers

The thermal energy keeps these two changing their temperature over time. 

The surrounding temperature (environment) clearly effects the cold water AND the boiling water. 

Eventually, both would reach an equilibrium in temperature. 
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A nail is made pointed why​