Answer:
The generator produces electrical energy at a rate of 1378125000 J per second.
Explanation:
volume of water falling each second is 1250 ![m^{3}](https://tex.z-dn.net/?f=m%5E%7B3%7D)
height through which it falls, h is 150 m
mass of 1
of water is 1000 kg
⇒mass of 1250
of water, m = 1250×1000 = 1250000 kg
acceleration due to gravity, g = 9.8 ![\frac{m}{sec^{2} }](https://tex.z-dn.net/?f=%5Cfrac%7Bm%7D%7Bsec%5E%7B2%7D%20%7D)
in falling through 150 m in each second, by Work-Energy Theorem:
Kinetic Energy(KE) gained by it = Potential Energy(PE) lost by it
⇒KE = mgh
= 1250000×9.8×150 J
= 1837500000 J
Electrical Energy =
(KE)
=
×1837500000
= <u>1378125000 J per second</u>
Answer:
145 m
Explanation:
Given:
Wavelength (λ) = 2.9 m
we know,
c = f × λ
where,
c = speed of light ; 3.0 x 10⁸ m/s
f = frequency
thus,
![f=\frac{c}{\lambda}](https://tex.z-dn.net/?f=f%3D%5Cfrac%7Bc%7D%7B%5Clambda%7D)
substituting the values in the equation we get,
![f=\frac{3.0\times 10^8 m/s}{2.9m}](https://tex.z-dn.net/?f=f%3D%5Cfrac%7B3.0%5Ctimes%2010%5E8%20m%2Fs%7D%7B2.9m%7D)
f = 1.03 x 10⁸Hz
Now,
The time period (T) = ![\frac{1}{f}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bf%7D)
or
T =
= 9.6 x 10⁻⁹ seconds
thus,
the time interval of one pulse = 100T = 9.6 x 10⁻⁷ s
Time between pulses = (100T×10) = 9.6 x 10⁻⁶ s
Now,
For radar to detect the object the pulse must hit the object and come back to the detector.
Hence, the shortest distance will be half the distance travelled by the pulse back and forth.
Distance = speed × time = 3 x 10^8 m/s × 9.6 x 10⁻⁷ s) = 290 m {Back and forth}
Thus, the minimum distance to target =
= 145 m
Answer: the answer is D. Aluminum and nitrogen
Explanation:
I’m pretty sure it just wants you to list the property’s meaning the material and density