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Vlad1618 [11]
3 years ago
10

Which of these best describes how the kinetic energy of carbon dioxide molecules change as the carbon dioxide is heated? (2 poin

ts) Kinetic energy decreases. Kinetic energy increases. Kinetic energy increases, then decreases. Kinetic energy decreases, then increases.
Physics
2 answers:
Delvig [45]3 years ago
8 0

<u>Answer:</u> B.)  <em>Kinetic energy increases.</em>

kari74 [83]3 years ago
5 0

B) Kinetic energy increases

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All machines are not 100% efficient because of <span>C. Friction</span>
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Identify the two pieces of information you need to know the velocity of an object
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A wind-tunnel experimentis performed on a 1/25scale model of a supersonic aircraft. The prototype aircraft flies at 450 m/s in c
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F = 4N

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A roller coaster cart of mass m = 223 kg starts stationary at point A, where h1 = 26.8 m and a while later is at B, were h2 = 14
Tresset [83]

Answer:

vB = 15.4 m/s

Explanation:

Principle of conservation of energy:

Because there is no friction the mechanical energy is conserve

ΔE = 0

ΔE : mechanical energy change (J)

K : Kinetic energy (J)

U: Potential energy (J)

K = (1/2)mv²

U = m*g*h

Where :

m: mass (kg)

v : speed (m/s)

h : hight (m)

Ef - Ei = 0

(K+U)final - (K+U)initial =0

(K+U)final = (K+U)initial

((1/2)mv²+m*g*h)final = ((1/2)mv²+m*g*h)initial , We divided by m both sides of the equation:

((1/2)vB² + g*hB = (1/2 )vA²+ g*hA

(1/2) (vB)² + (9.8)*(14.7) =  0 + (9.8)(26.8 )

(1/2) (vB)² = (9.8)(26.8 ) - (9.8)*(14.7)

(vB)² = (2)(9.8)(26.8 - 14.7)

(vB)² = 237.16

v_{B} = \sqrt{237.16}

vB = 15.4 m/s : speed of the cart at B

4 0
3 years ago
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