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Travka [436]
3 years ago
9

PLZZ HELP Explain how you can tell the difference between a physical and a chemical change.

Physics
1 answer:
Alecsey [184]3 years ago
7 0

Answer:

You can tell the difference between physical and chemical change by looking at the change that takes place like whether it is a permanent or temporary change.

Explanation:

  • physical change is temporary change and chemical change is permanent change
  • the original shape of the object can be restored in physical change whereas the original composition of the object will be lost in chemical change
  • in physical change the change is reversible whereas he chemical change is irreversible and the object takes new shape and position in this change.
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Explanation:

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3 years ago
An automobile engine has an efficiency of 19.0%. If it produces 23.0 kJ of mechanical work per second, the heat rejected per sec
creativ13 [48]

Answer:

(e) 98,1 KJ

Explanation:

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2 years ago
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ohaa [14]
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4 0
3 years ago
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An 92-kg football player traveling 5.0m/s in stopped in 10s by a tackler. What is the original kinetic energy of the player? Exp
Artemon [7]

Explanation:

It is given that,

Mass of the football player, m = 92 kg

Velocity of player, v = 5 m/s

Time taken, t = 10 s

(1) We need to find the original kinetic energy of the player. It is given by :

k=\dfrac{1}{2}mv^2

k=\dfrac{1}{2}\times (92\ kg)\times (5\ m/s)^2

k = 1150  J

In two significant figure, k=1.2\times 10^3\ J

(2) We know that work done is equal to the change in kinetic energy. Work done per unit time is called power of the player. We need to find the average power required to stop him. So, his final velocity v = 0

i.e. P=\dfrac{W}{t}=\dfrac{\Delta K}{t}

P=\dfrac{\dfrac{1}{2}\times (92\ kg)\times (5\ m/s)^2}{10\ s}

P = 115 watts

In two significant figures, P=1.2\times 10^2\ Watts

Hence, this is the required solution.  

6 0
2 years ago
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Lapatulllka [165]
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Hope this helps. 
3 0
2 years ago
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