(A) Assuming That the Earth Is a Solid Sphere of Uniform

question 6

Essay

(a) Assuming that the earth is a solid sphere of uniform density, calculate its moment of inertia and its rotational energy.
(b) The earth's rotation is slowing (i.e., the earth is losing rotational energy). The earth's rotational period (the length of the day) is increasing at a rate of $1.7 \times 10 ^ { - 5 } \mathrm {~s}$ per year. Calculate the annual rotational energy loss of the earth and compare this to the annual energy use by society.

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Definitions:

Thymus Gland

An immune system gland located behind the sternum that produces T-cells for the adaptive immune response.

Lymphatic Nodule

Small accumulation of lymph tissue lacking a distinct boundary.

CD4

A glycoprotein found on the surface of immune cells such as T helper cells, monocytes, macrophages, and dendritic cells, playing a key role in the immune system’s response to pathogens.

MHC Class II

Proteins found on the surface of certain immune cells that present antigens to the immune system, critical in distinguishing between self and non-self.