You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.8×(10^7) m and its rotation period to be 22.3 hours. You have previously determined that the planet orbits 2.2×(10^11) m from its star with a period of 432 earth days. Once on the surface you find that the free-fall acceleration is 12.2 m/s^2.What is the mass of (a) the planet and (b) the star?

Mp= 1.48×10^23 Kg and M = 4.47×10^30 Kg

Explanation:

Given that

Diameter of planet D = 1.8×10^6m

Radius of planet Rp = 0.9×10^6m

Period of rotation of planet = 22.3 hrs = 80280s

Radius of orbit r = 2.2 × 10^11 m

Period of revolution around star T =432days = 432×24×60×60 = 37324800s

Acceleration of gravity on the surface of planet gp = 12.2m/s^2

gp = GMp/(Rp)^2

Mp = gp×(Rp)^2 /G

= 12.2 * (0.9*10^6)^2 ÷ 6.67×10^-11

9.882×10^12 ÷ 6.67×10^-11

Mp= 1.4×10^23 Kg

To determine the mass of the star, we consider the revolution of the planet around the star with period T

T^2 = (4π^2/GM)r^3

M = 4π^2r^3 ÷ GT^2

M = 4π^2* (2.2×10^11)^3 ÷ 6.67×10^-11 × ( 37324800)^2

M= 4.47×10^30 Kg

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

ill do it for 100, also this isnt 80 its 40