PHYSICS MIDDLE SCHOOL

Two precautions in images of a convex lens

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Answer 1
Answer:

Answer:

1 . rays should passs through correct center or points(i.e. optic center or focus)

2.your line representing rays should be straight and u should tell the nature of image

Explanation:
Answer 2
Answer: Your lines resenting should be straight

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Relative velocity.....Please help....​

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Answer:

3. Usinθ

Explanation:

The vertical component of velocity of any object reaching maximum height is 0 and the horizontal component of velocity of any object in flight remains constant.

Therefore the horizontal component of velocity is Ucosθ for both objects at any given time.

At maximum height A is having 0 vertical velocity but B which just starting its flight is having Usinθ as its vetical component of velocity.

Velocity of B relative to A = Velocity of B - Velocity of A

As velocity can be resolved to components,( to simplify the sum )

Horizontal component of velocity of B relative to A = Horizontal component of velocity of B - Horizontal component of velocity of A

which is 3. Usinθ

A newspaper turns yellow in sunlight. Is this a physical or chemical change?

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It is a chemical change. I always think of a chemical/physical change as if you could  reverse it back as it started off, for example if you stepped on a can you can reverse the can back probably not exactly like it was before but you can still reverse it so this would be a physical change, and if you baked a pizza you could not reverse the dough and everything else back. 

What is one way that food is mechanically changed during the process of digestion

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Hi There! :)

What is one way that food is mechanically changed during the process of digestion

Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates.

If a 100 N net force acts on a 50 kg car, what will the acceleration of the car will be?

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according to newton's law Force = mass * acceleration
so , 100 = 50 * a
so , a= 2 m/s^2

Wh does a soccer ball that is quickly rolling across a grass field slow and finally stops rolling

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Friction which helps it stop is that what your asking
Friction cancels out the exerted force applied to the ball

How do prices help determine for whom goods will be produced in a market economy

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I tried dude, but someone got rid of my helpful resource...
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