Answer:
At least (3 significant figures.)
Assumption: there's no air resistance.
Explanation:
Let be the minimum speed at which that salmon leaves the water with an elevation angle of . .
- Initial horizontal velocity: ;
- Initial vertical velocity: .
Why is the initial horizontal velocity important? If there's no air resistance, the horizontal velocity of the fish will stay the same during its flight.
By the time the fish reaches the upper rim of the waterfall, it would have traveled horizontally. How much time after take-off will that occur?
.
For the fish to continue upstream, its height should be at least by the time it reaches the upper rim of the waterfall. In other words, at , .
If there's no air resistance, on the vertical direction the fish would accelerates downwards at a constant during the entire flight. Its height could be expressed as
.
That's the same as:
.
Let , Solve this equation for
.
Given that , .
In other words, the fish must leave the water at a speed of at least to continue upstream.
Answer:
A
Explanation:
A tendency to do nothing or to remain unchanged.
A property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
10 cm
you can see the distance from peak to peak or the distance between the starting point to the end of the first whole wave
Answer:
0.09kg of air
Explanation:
The dimensions of the room are given
change the height to meters by dividing it by thousand.
For the volume multiplying the length,width and height (all should be in the same unit most suitable being meters).
Volume refers to the amount of space inside a box or a object.
The amount of air is equal to the volume.