Suppose that gas at -30°C is stored inside a 1-cm-radius spherical container (k = 50 W/m. K) with a wall thickness of 2 cm. Inside and outside convective heat transfer coefficients are 1250 and 25 W/m2.K. If the ambient temperature is 25°C, a. Calculate overall heat transfer coefficient for the inner area (Ui). Determine heat transfer
rate using Ui.
b. Repeat part a for overall heat transfer coefficient for the outer area (Uo).

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the right answer is c i just did the question.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.