The velocity of the object is zero (the object is at rest)
Explanation:
A position vs time graph represents the motion of an object; in particular:
- The position of the object x(t) is represented on the y-axis
- The time t is represented on the x-axis
For a position-time graph, the slope of the graph is given by
where
is the change in position
is the change in time
However, we see that this is equivalent to the definition of velocity:
Therefore, the slope of a position-time graph is equivalent to the velocity of the object.
And so, a horizontal segment on a position vs time graph means that the object has zero velocity (because the slope is zero).
Learn more about velocity:
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Current Speed, as it couldn't be the average speed or anything like that since it's constantly changing. (It made me write the extra stuff)
Answer:
Liquid pressure is the increase in pressure at increasing depths in a liquid. This pressure increases because the liquid at lower depths has to support all of the water above it. We calculate liquid pressure using the equation liquid pressure = mass x acceleration due to g density x depth in fluid.
si unit is pascal
Answer:
The amount of work required for the heart is: 3.14 Joules
Explanation:
We need to remember that the work done for a pump with constant pressure will be:
, where W is the work, P is pressure and V is volume (change of the volume). Now we need to find the pressure. Using the Pascal's law (
), where P is pressure, p is density, g is the gravity and h is the height of the fluid's column and replacing the values given, we can find the pressure:
. Then using the work's equation and replacing the value obtain for the pressure and the volume we get:
.
