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olchik [2.2K]
3 years ago
11

I need help on this I will mark brainlist

Physics
2 answers:
expeople1 [14]3 years ago
7 0
A is the correct answer

It helps conductivity and it’s impossible to leave something the same if a change occurs.
faust18 [17]3 years ago
6 0

Answer: Its the first answer.

Explanation:

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The model that describes a Sun-centered solar system is called theA.laws of motion.B.geocentric model.C.heliocentric model.D.gen
artcher [175]
The answer is C the heliocentric model.
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3 years ago
Please help!! This is the last question and i’m unsure! I will mark brainliest! Please try to provide a explanation you don’t ha
Flauer [41]

Answer:

True

Explanation:

As of Newton's law, yes. Because when I land my feet on the ground, I apply a force. As per Newton's third law, the ground must apply the same force on me.

If its correct, may I hv brainliest?

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Explain why the poles are colder than the tropics.?
iren2701 [21]
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3 years ago
Round the following numbers.
crimeas [40]

Answer:

(a) 123.517 to 2 decimal places = 123.52

(b) 14.328 km/hr to 1 decimal place = 14.3

(c) 0.00934 m to 3 decimal places = 0.009

Explanation:

a. 123.517 to 2 decimal places

⇒ to 2 decimal places = 123.52 ( round 7 to 1 since it is up to 5 and add it to 1 before it.)

b. 14.328 km/hr to one decimal place.

⇒ to 1 decimal place = 14.3 (round 8 to 1 since it is up to 5 and add it to 2 before it, the 2 becomes 3, round the 3 to 0 since it is less than 5)

c. 0.00934 m to 3 decimal places.​

⇒ to 3 decimal place = 0.009

8 0
3 years ago
You are testing a new amusement park roller coaster with an empty car with a mass of 130 kg. One part of the track is a vertical
vlada-n [284]

Answer:

Work done by friction along the motion is given as

W_f = -5857.8 J

Explanation:

As per work energy theorem we can say

Work done by all forces = change in kinetic energy of the system

so here car is moving from bottom to top

so here the change in kinetic energy is total work done on the car

so here we will have

W_f + W_g = \frac{1}{2}m(v_f^2 - v_i^2)

W_f - mgH = \frac{1}{2}m(v_f^2 - v_i^2)

now plug in all data in it

W_f - (130)(9.81)(2\times 12) = \frac{1}{2}(130)(8^2 - 25^2)

W_f = 30607.2 - 36465

W_f = -5857.8 J

6 0
3 years ago
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