Which of the following is a physical model of the sun? a. an equation that describes the sun’s motion b. a chart that lists the temperatures of different parts of the sun c. a computer program that shows how the sun changes over time d. a paragraph that describes the sun’s structure e. a small yellow ball that represents the sun

E. a small yellow ball that represents the Sun

Explanation:

The question asks for a physical model/representation of the Sun.

The answer has to be something physical, something concrete, something you can touch.  This means it has to be in 3-dimensions, not just an image.

The other answer choices are providing information or abstract representations.  Abstract models are ones you cannot physically touch, but can picture in your mind or view as an image.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"