Answer:
The radius is decreatsing at a rate 0.78 cm per second.
Step-by-step explanation:
We are given the following in the question:
Instant radius,r = 2 cm
Instant length,l = 9cm
The radius of the cylinder decreases.
Volume of cylinder =
Since the volume of the cylinder does not changes, we can write:
Rate of change of volume:
Puttiung values, we get
Thus, the radius is decreatsing at a rate 0.78 cm per second.
Answer:
tsa of semi-cylinder is 21.21m²
Step-by-step explanation:
tsa of cylinder = 2πr² + 2πrh
radius = diameter ÷2
= 1.5m
tsa = (2×π×1.5²) + (2×π×1.5×3)
= 4.5π + 9π
= 13.5π
≈ 42.412m²(3d.p) (cylinder)
semi = 42.41 ÷ 2
≈ 21.21m² (2d.p)
(Correct me if i am wrong)
Answer:
y = -4.5
Step-by-step explanation:
104.12 < 104.20
104.20 is greater than 104.12