I can why do plants grow fast?
Figure is missing: find it in attachment.
Answer:
+4.50 m/s
Explanation:
The mass of the cart is
m = 40.0 kg
and its initial velocity is
u = -3.00 m/s (negative x-direction)
The graph represents the force applied to the cart versus time. We know that the area under the graph corresponds to the impulse, which is the change in momentum of the cart. We also notice that the force applied in the two parts is constant, so we can write the impulse simply as product between the force applied and the time interval:
In the first part of the motion (from 0 s to 20 s), the force applied is F = +20 N, so the impulse (and the change in momentum) is
In the second part of the motion (from 20 s to 30 s), the force applied is
F = -10 N
So the impulse is
So the total change in momentum of the cart is
The change in momentum can be written as
where v is the final velocity of the cart. Solving for v,
So, 4.50 m/s in the positive direction.
Answer:
v₁ = 9 m/s
Explanation:
Here, we can use the continuity equation, as follows:
where,
A₁ = Cross-sectional area of the wider section = 48 cm²
A₂ = Cross-sectional area of the constriction = 12 cm²
v₁ = speed of flow in wider section = ?
v₂ = speed flow in constriction = 36 m/s
Therefore,
<u>v₁ = 9 m/s</u>
Another (slightly more technical) name for kidney stones is "renal calculus".
I know this because we have met many times, and we are old friends.