A Dewar flask is a container designed to prevent heat transfer so that its contents remain hot or cold for a longer period of time. It consists of a double-walled container
in which most of the air has been removed from the space between the walls. Some
household thermoses are Dewar flasks. What heat-transfer processes are prevented
by removing the air between the walls?
a. Conduction and radiation
b. Conduction and convection
C. Convection and radiation
D. Conduction , convection , and radiation

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1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.