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jeka57 [31]
3 years ago
14

Mrs. Buckley asked her physical science class to look at the graph and tell which of the following explanations are most likely

true.
Option A: From 12 to 24 minutes the bicyclist was coasting down a hill.
Option B: At 35 minutes the bicyclist was not moving.
Option C: From 6 to 12 minutes the bicyclist was increasing his speed.
Option D: From 24 to 30 minutes the bicyclist was traveling down a steep hill. Question 8 options:
All of the options are most likely true.
Only option C is true.
Option A and B are true.
Option C and D are true.

Physics
2 answers:
iren [92.7K]3 years ago
3 0

I think it's D. Options C and D are true. The graph shows an increase in speed from points 6 to 12, which means Option C is true. It shows an even bigger increase in speed from points 24 to 30, and since bikes go faster when traveling downhill, I would think that Option D was correct as well.

prohojiy [21]3 years ago
3 0

OPTIONS C AND D ARE CORRECT THIS GUY ABOVE ME IS RIGHT

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Consider a cylindrical segment of a blood vessel 2.70 cm long and 3.10 mm in diameter. What additional outward force would such
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This question is incomplete, the complete question is;

- Calculate the difference in blood pressure between the feet and top of the head of a person who is 1.80m Tall

- Consider a cylindrical segment of a blood vessel 2.70 cm long and 3.10 mm in diameter. What additional outward force would such a vessel need to withstand in the person's feet compared to a similar vessel in her head

Answer:

- the difference in blood pressure is 18698.4 Pa

- the additional outward force F is 4.86 N

Explanation:

Given the data in the question;

we know that the expression for difference in blood pressure is;

ΔP = pgh

where p is density = 1060 kg/m³

g is acceleration due to gravity  = 9.8 m/s²

and h is height = 1.80 m

now we substitute

ΔP = 1060 × 9.8 × 1.80

ΔP = 18698.4 Pa

therefore the difference in blood pressure is 18698.4 Pa

Also given that;

diameter of blood vessel d = 3.10 mm

radius r = 3.10 mm / 2 = 1.55 mm = 0.00155 m

length l = 2.70 cm = 0.027 m

Surface area of the cylindrical segment of a blood vessel is

A = 2πrl

we substitute

A = 2 × π × 0.00155 × 0.027

A = 2.6 × 10⁻⁴ m²

so

the required for will be;

F = PA

we substitute

F = 18698.4 Pa × 2.6 × 10⁻⁴ m²

F = 4.86 N

Therefore, the additional outward force F is 4.86 N

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