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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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Describe two methods that can be used to cook eggs.​
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1. If the strength of the magnetic field at B is 3 units, the strength of the magnetic field at A is _____.
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<h3><u>Answer;</u></h3>

C. 12 units

<h3><u>Explanation;</u></h3>
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  • Magnetic field strength is one of two ways that the intensity of a magnetic field can be expressed.
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3 years ago
A kangaroo can jump over an object 2.46 m high. (a) Calculate its vertical speed (in m/s) when it leaves the ground.
Elenna [48]

Answer:

a) 6.95 m/s

b) 1.42 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

v^2-u^2=2as\\\Rightarrow -u^2=2as-v^2\\\Rightarrow -u^2=2\times -9.81\times 2.46-0^2\\\Rightarrow u=\sqrt{2\times 9.81\times 2.46}\\\Rightarrow u=6.95\ m/s

a) The vertical speed when it leaves the ground. is 6.95 m/s

v=u+at\\\Rightarrow t=\frac{v-u}{a}\\\Rightarrow t=\frac{0-6.95}{-9.81}\\\Rightarrow t=0.71\ s

Time taken to reach the maximum height is 0.71 seconds

s=ut+\frac{1}{2}at^2\\\Rightarrow 2.46=0t+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow t=\sqrt{\frac{2.46\times 2}{9.81}}\\\Rightarrow t=0.71\ s

Time taken to reach the ground from the maximum height is 0.71 seconds

b) Time it stayed in the air is 0.71+0.71 = 1.42 seconds

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The color of light most readily absorbed by water is _________.
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