A company has the goal of developing technology to remove carbon dioxide
1 answer:
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Answer: His average speed in mph over the last 400 m is 7.7 m/s.
Explanation:
Given: Hicham El Guerrouj of Morocco holds the world record in the 1500 m running race. He ran the final 400 m in a time of 51.9 s.
We know that , speed =
Here , distance = 400m and time = 51.9 s
Then, speed =
Hence, his average speed in mph over the last 400 m is 7.7 m/s.
Answer:
U = 11.67 W/m² °C
Explanation:
Inner diameter, d = 2.5 cm = 0.025 m
Thickness of the wall, t = 2 mm = 0.002 m
thus, the outer diameter, D = d + 2t = 0.025 + 2 x 0.002 = 0.029 m
Now, based on outside convection heat transfer
we have
on rearranging, we get
where, are the perimeter respective to inner and and outer diameter
on substituting the values, we get
or
U = 11.67 W/m² °C
The energy stored in a capacitor is given by
where C is the capacitance and V the voltage applied.
In our problem,
, while the energy is 
. We can then solve the formula to find V:
where C is the capacitance and V the voltage applied.
In our problem,