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tia_tia [17]
3 years ago
15

The softest known mineral is talc. It has a hardness of 1. What is the hardest known mineral

Physics
1 answer:
Vinvika [58]3 years ago
3 0

Answer:

diamond

Explanation:

diamond has a hardness of 10, and is the hardest mineral

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7. Water flows trough a horizontal tube of diameter 2.5 cm that is joined to a second horizontal tube of diameter 1.2 cm. The pr
Usimov [2.4K]

To solve this problem it is necessary to apply the concepts related to the continuity of fluids in a pipeline and apply Bernoulli's balance on the given speeds.

Our values are given as

d_1 = 2.5cm \rightarrow r_1=1.25cm=1.25*10^{-2}m

d_2 = 1.2cm \rightarrow r_2 = 0.6cm = 0.6*10^{-2}m

From the continuity equations in pipes we have to

A_1V_1 = A_2 V_2

Where,

A_{1,2} = Cross sectional Area at each section

V_{1,2} = Flow Velocity at each section

Then replacing we have,

(\pi r_1^2) v_1 = (\pi r_2^2) v_2

(1.25*10^{-2})^2 v_1 = ( 0.06*10^{-2})^2 v_2

v_2 = \frac{(1.25*10^{-2})^2 }{0.6*10^{-2})^2} v_1

From Bernoulli equation we have that the change in the pressure is

\Delta P = \frac{1}{2} \rho (v_2^2-v_1^2)

7.3*10^3 = \frac{1}{2} (1000)([ \frac{(1.25*10^{-2})^2 }{0.6*10^{-2})^2} v_1 ]^2-v_1^2)

7300= 8919.01 v_1^2

v_1 = 0.9m/s

Therefore the speed of flow in the first tube is 0.9m/s

6 0
4 years ago
What is a measure of the consistency and stability of test scores when readministered at different times?
tino4ka555 [31]

Answer:

Reliability is typically shown as a reliability coefficient created in a calculation to determine the reliability, or consistency, of scores, such as a measure of the amount of consistency between two sets of scores from different administrations from the same group of students.

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A person lifts a 6.50kg box off the ground a vertical distance of 1.25m and then carries it horizontally across the room by 4.75
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What type of reaction is being shown in this energy diagram
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3 years ago
_honest person is always at peace<br>​
borishaifa [10]
Hmmm I dunno buddy sorry
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NO LINKS OR I WILL REPORT YOU b/t/w i\d\k if this is physics or not
MrMuchimi

Above information helps you bro.

4 0
3 years ago
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