Heat can be transferred through conduction, convection, and radiation. What is necessary in order for heat to be transferred by conduction?
A.
The substances must be liquids or gases.
B.
The objects must be in direct contact with one another.
C.
Heat must be transferred through space.

B

Explanation:

Conduction is transferred from one area to another. Conduction can occur within material or between materials that are in thermal contact.

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.