Question

image courtesy of nasa/jpl - caltech
each group placed a container with 500 ml of water in the prototype for testing. the table below shows the details of the solar cookers.

	greenhouse design		reflection design
thickness of the cardboard	1.5 cm	5 cm	1.5 cm	5 cm
depth of the oven	3 inches	5 inches	3 inches	5 inches
material of the water’s container	metal	plastic	metal	plastic
amount of time to bring the water to a boil	7 minutes	5 minutes	8 minutes	10 minutes
amount of time the water remains above 180°f	1.5 hours	1 hour	45 minutes	45 minutes

how can a design combine elements of the prototype designs to best meet the criteria and constraints?
a. it should preserve heat like group a’s design and heat as quickly as group b’s design.
b. it should heat as quickly as group d’s design and have an oven depth of group c’s design.
c. it should heat as quickly as group a’s design and preserve heat like group b’s design.
d. it should preserve heat like group c’s design and have the cardboard thickness of group d’s design.

Explanation:

Group A preserves heat longest (1.5 hours) and Group B heats water fastest (5 minutes). Combining these two strengths would best meet criteria for quick boiling and long heat retention. Other options mismatch fast heating or good heat preservation: B uses slow-heating Group D; C reverses A/B's strengths; D uses slow-heating Group D and short heat retention from C/D.

Answer:

A. It should preserve heat like Group A's design and heat as quickly as Group B's design