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Ugo [173]
2 years ago
13

Cindy runs 500 meters every morning. It takes her 2 hours to complet

Physics
1 answer:
marta [7]2 years ago
7 0

Answer:

250 / 2.5*10^2

Explanation:

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room-darkening window shades are used to keep sunlight out of a theater. what type of material should the shades be made of? Exp
Scorpion4ik [409]

Answer:

very thick cloth or something maybe wool

Explanation:

8 0
3 years ago
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Paul’s 10 kg baby sister Susan sits on a mat. Paul pulls the mat across the floor using a rope that is angled 30° above the floo
kiruha [24]

Answer:

The speed of Susan is 2.37 m/s

Explanation:

To visualize better this problem, we need to draw a free body diagram.

the work is defined as:

W=F*d*cos(\theta)

here we have the work done by Paul and the friction force, so:

W_p=F_p*d*cos(0)\\F_p=30N*cos(30^o)=26N\\W_p=26*3*(1)=78J

W_f=F_f*d*cos(180)\\F_f=\µ*(10*9.8-30N*sin(30^o))=16.6N\\W_p=16.6*3*(-1)=50J

Now the change of energy is:

W_p-W_f=\frac{1}{2}m*v^2\\v=\sqrt{\frac{2(78J-50J)}{10kg}}\\v=2.37m/s

4 0
3 years ago
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According to the Law of Conservation of Energy, why does the first hill on a roller coaster always have to be the tallest of all
enyata [817]
Because it generates enough momentum to keep the train going with out really having to speed up
5 0
3 years ago
Which scientist saw the atom as a positively charged sphere with negative particles ( electrons ) embedded within?
Zigmanuir [339]
Ernest Rutherford is the answer you are looking for my friend.
5 0
3 years ago
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Velocity can best be described by which of the following statements?
pogonyaev

Answer: Velocity can best be described as, the speed in a given direction.

Explanation: To find the answer, we need to know more about the Velocity of a body.

<h3>What is Velocity of a body?</h3>
  • Velocity is the rate of change of displacement.
  • It's a vector quantity and is measured in m/s.
  • It can be positive, negative or zero.
  • A body is said to be in uniform motion, then its velocity remains constant.
  • Change in velocity can be a change in speed.
  • The magnitude of velocity is less than or equal to speed.

Thus, we can conclude that, the option C is best describing velocity.

Learn more about velocity here:

brainly.com/question/28108466

#SPJ4

8 0
2 years ago
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