The weight of Earth's atmosphere exerts an average pressure of 1.01 ✕ 105 Pa on the ground at sea level. Use the definition of pressure to estimate the weight of Earth's atmosphere (in N) by approximating Earth as a sphere of radius RE = 6.38 ✕ 106 m and surface area A = 4πRE2. Apply the definition of pressure.

the shell is thin, but has a definite thickness.  Calculate the (volume) density of the shell, in g/cm3.  Here are the numbers: R = 28 cm M = 800 grams thickness = 0.3 mm

Assume that the density of the atmosphere as a function of altitude h (in kilometers) above sea level is  ?(h) = ae−bh kg/km3,  where  a = 1.225 × 109  and  b = 0.21.  Calculate the total mass M of the atmosphere contained in the cone-shaped region  sqrt x2 + y2  ≤ h ≤ 3.  (If you enter your answer in scientific notation, round the decimal value to three decimal places. Use equivalent rounding if you do not enter your answer in scientific notation.) M= _kg

In the image are three point charges, Q1 = 22.4 µC, Q2 = -38.6 µC, and Q3 = 87.3 µC, arranged according to the figure. A fourth point charge is located at point A with a charge of QA = 13.5 µC. The charges form a square with height y of 10.1 cm and width x of 10.1 cm. Calculate the magnitude F of the net force on the charge at point A. 1274.49 2, + F = N A Incorrect y + 2;