<span>To find the acceleration we are given two facts to begin. The impact at 16 km/h and the dent of 6.4 cm, or 0.064 meters. In solving the problem uniform acceleration is assumed, which would mean the avg speed during the impact was 8 km/hr by taking 16/2. We know distance = rate*time (d=r*t) . So t = d / r, so 0.64/8 = 0.008hr for t. Now we can solve for acceleration by taking a = 16 / 0.008 = 2000 km/hr.</span>
Wavelength = (speed) / (frequency)
so in order to answer this question, we need the speed of sound.
Without using my precious time to go look it up, I'm guessing that
the speed of sound at STP is roughly 343 m/s .
If that estimate is accurate, then
Wavelength = (343 m/s) / (440 /s) = 0.78 meter .
Choice-#2 is much closer to this result than any of the others,
so choice-2 must be it.
Actually, we can 'reverse engineer' Choice-#2 and find the number
it uses for the speed of sound.
Speed = (wavelength) x (frequency)
= (0.75 m) x (440 /s) = 330 m/s .
The author of the question used 330 m/s for the speed of sound.
Hello!
Let's put it into symbols:
Change in velocity =
A measurable interval:
This division is:
We can recognize this as the
Average Acceleration
Answer:
The total area of rooftop solar panels is 130.61 m².
Explanation:
Given that,
Efficiency = 15%
Intensity of sunlight
Power = 19.2 kW/d
Let sun's power need be P.
We need to calculate the power
We need to calculate the total area of rooftop solar panels
Using formula of power
Where, I = intensity
A = area
P = power
Put the value into the formula
Hence, The total area of rooftop solar panels is 130.61 m².
Good morning!
Wind energy is closer to the energy provided by the Tides as both are governed by forces of nature. In addition, the two are considered renewable energy sources and generate kinetic energy. These kind of energy are often used in Brazil.
Hugs!