aving established that a sound wave corresponds to pressure fluctuations in the medium, what can you conclude about the directio
1 answer:
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The distance of the track is 600 m
Explanation:
The two cars move by uniformly accelerated motion, so we the distance they cover after a time t is described by the following suvat equation
where
u is the initial velocity
a is the acceleration
For car 1, we have
where
is the initial velocity of car 1
is the acceleration of car 1
So the equation can be rewritten as
For car 2, we have
where
is the initial velocity of car 2
is the acceleration of car 2
So the equation can be rewritten as
The two cars finish the race at the same time: this means that they cover the same distance in the same time t, so we can write
And solving for t, we find
Which gives two solutions:
t = 0 (initial instant)
t = 40 s
Therefore, the distance of the track is
Learn more about accelerated motion:
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Answer:
83.33% of the roof area will be occupied by the PV cells
Explanation:
Given the data in the question;
time-averaged lighting requirement = 10 W/m²
the annual average solar irradiance = 150 W/m²
the PV efficiency η = 10% = 0.1
battery charging/discharging efficiency η = 80% = 0.8
we know that; Annual average power to the light = × A
Now, the electrical power delivered by the solar cell battery system will be;
⇒ × A
× η
× η
A
=
× A
× η
× η
Such that;
A =
A
/
× A
× η
× η
A / A
=
/
× η
× η
so we substitute
A / A
= 10 W/m² / [ 150 W/m² × 0.1 × 0.8 ]
A / A
= 10 W/m² / 12 W/m²
A / A
= 0.8333
A / A
= (0.8333 × 100)%
A / A
= 83.33%
Therefore, 83.33% of the roof area will be occupied by the PV cells.