zdwilliams1308
05.11.2019 •
Physics
Sarah's group designed this oven and eventually melted the
chocolate, but it took a very long time. sarah suggested a design
modification: she thought they should cover the bottom of the box
with black paper and leave the aluminum foil up above. is sarah
correct? why or why not?
a)
b)
no. the top and bottom should be covered with
aluminum foil to reflect the rays of the sun
no. the bottom and sides of the box should be
covered with rolled up newspapers to insulate
the box
yes. a black bottom will absorb more heat energy
when the sunlight is reflected into the box by the
foil.
not completely. sarah is correct about the bottom. it
should be black. but the rest of the box should be
black to absorb heat energy
c)
d)
Solved
Show answers
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Ответ:
weight is 442.10 kg
Explanation:
given data
weight = 1400 kg
length = 6 m
to find out
how many kilogram 19 m beam support
solution
we know by inverse variation formula of weight that is
weight = .............1
here k is constant and l is length
so k will be
1400 =
k = 8400
so for 19 m weight will be by equation 1
weight =
weight =
weight = 442.10 kg