PHYSICS MIDDLE SCHOOL

How many times louder is a 70 dB sound than a 60 dB sound

Answers

Answer 1
Answer:

Answer:

Half as loud as the seventy
Answer 2
Answer:

Answer:

70 dB is twice as loud as 60 dB.

Explanation:

Most people perceive an increase of 10 dB as a doubling in volume of a sound.

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You do 25 J of work to move a 4N object 5 meters. Find your efficiency and write down the formula.

Answers

4*5=20;  ration of 20:25, 
20/25= %80 

Can someone hlp me fx
my rrblx

Answers

Answer:

Explanation:

so when you usually sign in to something and you forget the password you would usually see a reset password option and when you click on it you need to put in our email then it should send your email a code that you put into the box that you put the code in to reset the password.

If you are not able to insert the code after about 10 to 15 min. then under the bar it should say resend code and the same thing will happen again and you are going to have to put in the new code.

I hope this helps and sorry if you are confused if you need more help send your questions to my email and ill be happy to help!

Leo.Thineyog at stu.fayette.kyschools.us

If the speedometer on a car indicates a constant speed, can you be sure the car is not accelerating? Explain

Answers

no because it might just have a constant speed , even though it's likely improbable
No,because you can go on an open road then climb a hill and for that you should accelerate for maintain a constant speed

Is stained glass window a transparent?

Answers


A stained glass window usually has several sections to it,
and they handle light differently.

-- The sections that are completely clear, and if you look
through one of them you can see the cars outside in the
parking lot, are transparent.

-- The sections that are milky, and light comes through them
but if you look through them you can't see the shapes of cars
or people, are translucent.

-- The sections that are so heavily stained or tinted that they
look completely dark are opaque.
a stained glass window is not a transparent because it doesn't show anything outside because it is stained so the answer is not transparent.

According to the first law of thermodynamics what could happen when heat is added to a system

Answers

Answer: Increase internal energy and work done by the system

Explanation: According to the first law of thermodynamics conservation of energy, when heat is added to the system then the system gain or loss of energy.

So, when we add heat to a system then increases internal energy and external work done by the system.

temperature rises ? specific heat capacity etc ...

Can someone please help me with this question?

Answers

The answer is B because, the farther the goes the speed starts to decrease and stops it depends on the frequency of the wave.
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HELP!!!!!! PLEASE!! I WILL GIVE 25 POINTS!!!!1) Joe and Ben were arguing about the Law of Conservation of Energy. Joe said that the Law of Conservation of Energy must be false because when you turn on a light it uses energy and so some of the energy is lost. Ben disagrees and says that energy cannot be created or destroyed. Who is right? Justify your answer.A) Joe is right because the electricity is changed to heat and light and is no longer electricity.B)Ben is right because the Law of Conservation of Energy is a law and cannot be false.C) Ben is right because the electricity from the light is transformed into heat and light.D) Joe is right because all electrical lights and appliances use electricity.2) Greg and Shawn are studying for a physical science test. Greg thinks that the kinetic energy of an object depends on the height and speed of an object, but Shawn thinks it depends on the mass of an object. Who is right and why?A) Shawn is right. The mass of an object determines the inertia of the object. Increasing inertia is the only thing that will increase kinetic energy.. B) Both Greg and Shawn are correct since kinetic energy depends on mass, height and speed of an object.C) Greg is right. Increasing the height or speed of an object increases the kinetic energy of an object.D) Neither is completely right. Shawn is partly correct since kinetic energy depends on mass, but Greg is also partly right since it also depends on speed.3) Dan got into his car in the middle of summer. When he sat on the hot black leather seats, he burned his legs. His sister said that conduction was the reason Dan burned his legs, but Dan blamed the sunshine and said it was radiation that caused him to get burned. Who was right and why?A) Both Dan and his sister are right. The sun heated the car seats through radiation heat transfer, but then Dan touched the seat and the heat was conducted to his legs.B) Dan's sister was correct because Dan's legs touched the car seats. That is an indicator of heat transfer by conduction.C) Dan was right because the sun heated the car without touching it. That is radiation.D) Dan's sister was right because conduction can transfer heat through both solids and fluids (such as air).
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