PHYSICS MIDDLE SCHOOL

The acceleration of an object depends on the ____________ exerted on it and it's_________ this is to do with newton's seconed law

Answers

Answer 1
Answer: force is the first and mass is the second

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An optical fiber can make a light beam travel in a path that is curved or twisted? True or False

Can someone please help me answer 14 and 15??

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14. The Aurora is an incredible light show caused by collisions between electrically charged particles released from the sun that enter the earth's atmosphere and collide with gases such as oxygen and nitrogen. The lights are seen around the magnetic poles of the northern and southern hemispheres.

15.
About 5.4 billion years from now, the sun will have exhausted all of its hydrogen. The sun's core will get really hot and dense, thus shrinking; however, the outer region of the sun will expand and grow. ... Even if the expanding dying sun doesn't reach Earth, the sun's high temperatures will completely burn the planet.

Two planets of the same mass are observed.Which of the following distances between the two planets would result in the least gravitational attraction?

A. 90 light years
B. 80 light years
C. 60 light years
D. 50 light years

Answers

It really doesn't matter what mass the planets have, or whether they're equal, or whether they're planets. The farther apart two objects are, the less gravitational attraction there is between them.
As the distance increases, the gravitational force between them decreases.
So, the option with the largest distance is (A) 90 light yrs. And that's the answer !!

What is the difference between mechanical digestion and chemical digestion in the mouth

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Mechanical digestion is chewing, and chemical digestion is the saliva in your mouth breaking down food.
Mechanical digestion is where the food is physically broken down into smaller pieces, such as in the mouth. Chemical digestion is where the food us chemically broken down into subtomic particles , starting with the saliva in the mouth and continuing throught the small intestine.

a baseball bat is in contact with a ball for 0.02 seconds, and exerts a force of 400 newtons. what is the impulse on the ball?​

Answers

Answer:

I=8 Nw.s

Explanation:

Impulse

It is a physical magnitude that measures the force applied to an object by the time that force is acting. It produces a change in the momentum of the object, which is expressed in the following formula

I=\Delta p=m(v_2-v_1)=F.t

We know the bat applies a force on the ball of F=400 N during t=0.02 sec, thus the impulse is

I=(400) (0.02)=8\ Nw.s

\boxed{I=8\ Nw.s}

A graduated cylinder is filled to an initial volume of 12.7 ml. A rock Is dropped into the graduated cylinder. The final volume of the graduated cylinder is 18.2ml. What is the Rocks volume in both ml and cm3? What method was used to determine this?

Answers

Answer:

V = 5.5 mL

Explanation:

The volume filled in the graduated cylinder is 12.7 mL

now when a stone is dropped into the cylinder then the volume of liquid is raised to final level of 18.2 mL

so as per the theory of given by Archimidies we can say that the volume of the object is exactly same as the volume displaced by the object

So here the volume displaced by the object is given as

V_(displaced) = V_f - V_i

V_(displaced) = 18.2 mL - 12.7 mL

V_(displaced) = 5.5 mL

so the volume of the object is given as

V = V_(displaced)

V = 5.5 mL
First of all, ml and cm^3 are equal. The volume of the rock is 5.5 ml. This is found by subtracting the volume of just the water from the combined volume of the rock and the water leaving you with just the volume of the rock. This is method is using water displacement.

Which tool would you use to measure the height of a cube of metal

Answers

It depends on the size of the cube, but you could use a ruler for almost any size, or if it is small enough, you could use a caliper to get a very precise measurement.
it really depends on the size.. if its huge i would use a meter ruler, if it is small use a reguler ruler... 
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