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Marysya12 [62]
3 years ago
14

A physical change can be distinguished from a chemical change because during a physical change- A. the properties of the substan

ce may change, but no new substances are produced B. the properties of the substance change for only a short time but will return to their original state. C. an entirely new substance with new properties forms as a result of the change D. a new substance is produced, but the new substance has properties identical to the original substance.
Physics
1 answer:
joja [24]3 years ago
3 0

Answer:

a

Explanation:

yw

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A body weighing 50 N is placed on a wooden table. How much force is required to set it into motion? Coefficient of friction betw
tigry1 [53]

If the coefficient of static friction is 0.3, then the minimum force required to get it moving is equal in magnitude to the maximum static friction that can hold the body in place.

By Newton's second law,

• the net vertical force is 0, since the body doesn't move up or down, and in particular

∑ <em>F</em> = <em>n</em> - <em>mg</em> = <em>n</em> - 50 N = 0   ==>   <em>n</em> = 50 N

where <em>n</em> is the magnitude of the normal force; and

• the net horizontal force is also 0, since static friction keeps the body from moving, with

∑ <em>F</em> = <em>F'</em> - <em>f</em> = <em>F'</em> - <em>µn</em> = <em>F'</em> - 0.3 (50 N) = 0   ==>   <em>F'</em> = 15 N

where <em>F'</em> is the magnitude of the applied force, <em>f</em> is the magnitude of static friction, and <em>µ</em> is the friction coefficient.

4 0
3 years ago
PLEASE HELP WILL GIVE 30 POINTS
Sholpan [36]

Answer:

I think its c

Explanation:

I hope this helps u and u get it right :D

7 0
3 years ago
Read 2 more answers
What velocity will it take to slingshot a planet with 9.8m/s gravity
Yuri [45]
It depends on how close you get to it. Remember that its gravity decreases as you get farther from it.
3 0
4 years ago
A ball at the top of a hill is an example of ______ and a ball rolling down the hill is an example of ______.
larisa [96]

Potential energy , Kinetic energy

<h3 /><h3>What is kinetic energy and potential energy?</h3>

Kinetic energy is a form of energy that posses by an object due to its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.

Potential energy is the energy held by an object due to its position relative to other objects, stresses within itself, its electric charge, or other factors.

According to given condition,

At first,

When a ball is at the top of a hill , it posses a potential energy because the ball is at some height from the surface  where  the energy held by ball is due to its position.

That is why,  a ball at the top of a hill is an example of Potential energy.

Secondly,

When a ball is rolling down the hill , it posses kinetic energy because the ball have some energy that posses by an object due to its motion.

That is why, a ball rolling down the hill is an example of  Kinetic energy.

Learn more about Potential energy and Kinetic energy here:

brainly.com/question/11749818

#SPJ1

6 0
2 years ago
Wanda has a cube of sugar. She crushes it into a powder. What has changed about the sugar?
stira [4]
Mass always stays the same therefore it can’t be c and d. Volume stays the same because she is not removing anything. Therefore it is a
5 0
3 years ago
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