The answer is b. According to the law of conservation of energy, energy can never be created nor destroyed, only transferred from one form to another.
Answer:
a = 162.7 m/s²
Explanation:
given,
radius = 1.5 m
height above ground level = 2 m
horizontal distance = 10 m
magnitude of centripetal acceleration = ?
we know,
centripetal acceleration
a =![\dfrac{v^2}{r}](https://tex.z-dn.net/?f=%5Cdfrac%7Bv%5E2%7D%7Br%7D)
using equation of motion
![s = u t + \dfrac{1}{2}at^2](https://tex.z-dn.net/?f=s%20%3D%20u%20t%20%2B%20%5Cdfrac%7B1%7D%7B2%7Dat%5E2)
![s =\dfrac{1}{2}gt^2](https://tex.z-dn.net/?f=s%20%3D%5Cdfrac%7B1%7D%7B2%7Dgt%5E2)
![t = \sqrt{\dfrac{2s}{g}}](https://tex.z-dn.net/?f=%20t%20%3D%20%5Csqrt%7B%5Cdfrac%7B2s%7D%7Bg%7D%7D)
![t = \sqrt{\dfrac{2\times 2}{9.8}}](https://tex.z-dn.net/?f=%20t%20%3D%20%5Csqrt%7B%5Cdfrac%7B2%5Ctimes%202%7D%7B9.8%7D%7D)
t = 0.64 s
velocity
![v = \dfrac{s}{t}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7Bs%7D%7Bt%7D)
![v = \dfrac{10}{0.64}](https://tex.z-dn.net/?f=v%20%3D%20%5Cdfrac%7B10%7D%7B0.64%7D)
v = 15.625 m/s
centripetal acceleration
a =![\dfrac{15.625^2}{1.5}](https://tex.z-dn.net/?f=%5Cdfrac%7B15.625%5E2%7D%7B1.5%7D)
a = 162.7 m/s²
Answer:
4.41 W
Explanation:
P = IV, V = IR
P = V² / R
Given that P = 0.0625 when V = 1.50:
0.0625 = (1.50)² / R
R = 36
So the resistor is 36Ω.
When the voltage is 12.6, the power consumption is:
P = (12.6)² / 36
P = 4.41
So the power consumption is 4.41 W.
Answer:
The wavelength of wave is 2.78 m.
Explanation:
Frequency of a wave is 90 Hz
Speed of a wave is 250 m/s
It is assume to find the wavelength of wave. The formula of speed is given by :
![v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{250}{90}\\\\\lambda=2.78\ m](https://tex.z-dn.net/?f=v%3Df%5Clambda%5C%5C%5C%5C%5Clambda%3D%5Cdfrac%7Bv%7D%7Bf%7D%5C%5C%5C%5C%5Clambda%3D%5Cdfrac%7B250%7D%7B90%7D%5C%5C%5C%5C%5Clambda%3D2.78%5C%20m)
So, the wavelength of wave is 2.78 m.