Answer:
840 W
Explanation:
The energy expended in hoisting the diver up is given by
<em>m</em> is the mass of the diver, <em>g </em>is the acceleration due to gravity and <em>h</em> is the height.
Using the values in the question and taking <em>g</em> as 9.8 m/s²,
The power is given by
<em>t</em> is the time.
Hence,
The Gravitational Force between given objects will be ~
We know that ~
where ~
Let's calculate the force ~
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.
Answer:
The power consumed by the air filter is 9.936 watts
Explanation:
It is given that, the secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter.
Turn ratio of the transformer,
Voltage of primary coil,
Current in the secondary coil,
The power consumed by the air filter is :
...........(1)
For a transformer,
So,
So, the power consumed by the air filter is 9.936 watts. Hence, this is the required solution.