False; the three major scales used to measure earthquakes are the Mercalli Scale, the Richter Scale, and the Magnitude Scale. I hope this helps!
Answer:
D) 3.0
Explanation:
As we know that
![The\ specific\ gravity\ of\ fluid = \frac{density\ of\ fluid}{density\ of\ water \ at\ 4\ C} = \frac{\rho_f}{1,000}](https://tex.z-dn.net/?f=The%5C%20specific%5C%20gravity%5C%20of%5C%20fluid%20%3D%20%5Cfrac%7Bdensity%5C%20of%5C%20fluid%7D%7Bdensity%5C%20of%5C%20water%20%5C%20at%5C%204%5C%20C%7D%20%3D%20%5Cfrac%7B%5Crho_f%7D%7B1%2C000%7D)
![0.6 = \frac{\rho_f}{1000}](https://tex.z-dn.net/?f=0.6%20%3D%20%5Cfrac%7B%5Crho_f%7D%7B1000%7D)
So,
![\rho_f = 600](https://tex.z-dn.net/?f=%5Crho_f%20%3D%20600)
Now
T = True weight of object
= mg
![= 25 \times 9.8](https://tex.z-dn.net/?f=%3D%2025%20%5Ctimes%209.8)
= 245 N
W = apparent weight = 200 N
= density of object
Now we use the formula
buoyancy force = True weight - W
![\rho_f V g = 245 - 200](https://tex.z-dn.net/?f=%5Crho_f%20V%20g%20%3D%20245%20-%20200)
600 V (9.8) = 45
V = 0.007653
m = 25 kg
And as we know that
![\sigma = \frac{m}{V}](https://tex.z-dn.net/?f=%5Csigma%20%3D%20%5Cfrac%7Bm%7D%7BV%7D)
![= \frac{25}{0.007653}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B25%7D%7B0.007653%7D)
= 3266.7
Now
specific gravity is
![= \frac{\sigma}{water\ density}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B%5Csigma%7D%7Bwater%5C%20density%7D)
![= \frac{3266.7}{1000}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B3266.7%7D%7B1000%7D)
= 3.2
Hence, the correct option is d.
The critical mass of a fissionable material depends upon its nuclear properties (specifically, the nuclear fission cross-section), its density, its shape, its enrichment, its purity, its temperature and its surroundings.
i hope this helps. if it does please mark brainliest.
The correct answer is C They are inexpensive to use. Trust me I just took the test.
Mark me Brainiest please.