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30.07.2019 •
Mathematics
The ratio of the lengths of corresponding parts in two similar solids is 21.
what is the ratio of their surface areas?
а. 2: 1
в. 8: 1
d. 4: 1
d. 6: 1
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Ответ:
Option D. 4:1
Step-by-step explanation:
we know that
If two solids are similar, then the ratio of the lengths of corresponding parts is equal to the scale factor and the ratio of its surface areas is equal to the scale factor squared
In this problem
The scale factor is equal to (ratio of corresponding lengths)
therefore
The ratio of their surface areas is equal to
Ответ:
43.1N
Step-by-step explanation:
this question involves the application of the use of the equations of motion and the newton's law of motion
the parameters are
initial velocity u = 0
distance (s)= 12
mass (m)=5.5kg
t=1.75s
a= acceleration
S= ut + at²
12= (0×1.75) + ( × a × 1.75²)
12= 0 + (1.53125 × a)
12 = 1.53125 × a
a = 12÷1.53125
a= 7.8367m/s²
F=m × a
=5.5 × 7.8367
=43.10N