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gtnhenbr [62]
4 years ago
13

Why are chemical changes considered unseen?

Physics
1 answer:
Bogdan [553]4 years ago
7 0
They occur at atomic level, changing the structure of the object.
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Compare and contrast lava and magma
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A 1500-kg car locks its brakes and skids to a stop on a slippery horizontal road, leaving skid marks that are 15 m long. How muc
Harman [31]

Answer:

E=88200\ J

Explanation:

Given:

  • mass of car, m=1500\ kg
  • distance of skidding after the application of brakes, d=15\ m
  • coefficient of kinetic friction, \mu_k=0.4

<u>So, the energy dissipated during the skidding of car:</u>

<em>Frictional force:</em>

f=\mu_k.N

where N = normal reaction by ground on the car

f=0.4\ties 1500\times 9.8

f=5880\ N

<em>Now from the work-energy equivalence:</em>

E=f.d

E=5880\times 15

E=88200\ J is the dissipated energy.

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Why do smaller endotherms require more energy per unit of mass than larger endotherms?
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If a car is moving backward and has negative acceleration, what can be said about the speed of the car?
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Read 2 more answers
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