Answer:
Explanation:
Given
Ray of light incident on plane making an angle of
with normal
Thus incident angle 
So according to the law of incidence is equal to angle of reflection

thus 
and angle between mirror and reflected ray 

Answer:Average speed is greater than average velocity.
Explanation :
Given
student walks slowly along a straight line for a while ,then stops to rest a while, and finally runs quickly back to her initial position
Let x be the length of track and the whole process takes t time
For average speed 
Average speed
For average velocity 
Since displacement is zero as she returns to its initial position.
Average velocity=0
Therefore Average speed is greater than average velocity.
Answer:
Solution given;
load =600N
effort=?
load distance: 0.6m
effort distance;2.6m
we have
load *load distance :effort *effort distance
0.6*600=effort *2.6
360/2.6=effort
effort:138.46N
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Answer:
The mass of snow that the backpacker collected is: <em>D) 855g</em>
Explanation:
To boiling the water, the cooking pot requires 643kJ. This heat is due to the heat to melt the water and the heat to bring the water to boiling point.
The heat to melt the water is:
q = ΔHfusion×
×mass
And heat to bring water to boiling point is:
q = C×mass×ΔT
Where C is specific capacity of liquid water and ΔT is change in temperature (100°C, from melting point to boling point)
As the required energy required is 643000J:
643000J = ΔHfusion×
×mass + C×mass×ΔT
643000J = 6020J/mol×
×mass + 4,18J/g°C×mass×100°C
643000J = 334J/g×mass + 418J/g×mass
643000J = 752J/g×mass
855g = mass
<em>The mass of snow that the backpacker collected is 855g</em>
I hope it helps!
Answer:
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Explanation:
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