What is the magnification when an object is placed at 2f from the pole of the convex mirror?
1 answer:
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Answer:
There are 8345714 cell membranes.
Explanation:
It is given that,
The thickness of a cell membrane is 7 nm
We need to find the number of cell membranes would it take to make a stack 2.3 inches high.
Firstly, the units must be same i.e. converting 2.3 inches to m
1 inch = 0.0254 m
2.3 inches = 0.05842 m
Let there are n number of cell membranes. So,
or
n = 8345714 cell membranes
Answer:
(a) 14.5 m/s
(b) 9.5 m/s
Explanation:
Let the speed of the boat in the still water (i.e relative to ground) is .
Given that the speed of the boat relative to water, m/s.
Speed of the water current of the river relative to the ground, m/s towards east.
(a) When the boat is heading toward the east (in the same direction of the current of the river)
The relative velocity, , of the boat with respect to ground is
m/s
Hence, the boat's speed relative to the ground when it is heading east, with the current, is 14.5 m/s.
(b) When the boat is heading toward the west (in the opposite direction of the current of the river)
The relative velocity, , of the boat with respect to ground is
m/s
Hence, the boat's speed relative to the ground when it is heading west, against the current, is 9.5 m/s.