Which types of heat transfer involve heat flow from hot objects to colder objects?
a.
convection, conduction, and radiation
b.
convection, but not conduction or radiation
c.
convection and conduction, but not radiation
d.
convection and radiation, but not conduction

The correct answer is Option A.

Explanation:

Heat transfer is defined as the process in which heat is transferred from high temperature to low temperature to maintain equilibrium.

There are 3 modes by which heat can be transferred, they are:

Thus, all these three modes involve the heat flow from hot objects to cold objects.

Hence, the correct answer is Option A.

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.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.