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ad-work [718]
4 years ago
14

A substance with a pH of 9 has

Physics
1 answer:
Lady bird [3.3K]4 years ago
3 0

A) no H30+ ions or OH- ions.
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A novice pilot sets a plane’s controls, thinking the plane will fly at 2.50 × 102 km/h to the north. if the wind blows at 75 km/
serg [7]

Velocity of plane is given as

v_1 = 2.50 * 10^2 km/h towards north

v_2 = 75 km/h towards south east

we can write the two velocity in vector form

v_1 = 2.50 * 10^2 \hat j

v_2 = 75 cos45 \hat i - 75 sin45 \hat j

now the net velocity will be given as

v_{net} = v_1 + v_2

v_{net} = 250\hat j + 53.03 \hat i - 53.03 \hat j

v_{net} = 53.03\hat i + 196.97 \hat j

so the resultant velocity will be given as

v_{net} = \sqrt{53.03^2 + 196.97^2}

v_{net} = 203.98 m/s

and the angle of velocity will be

\theta = tan^{-1}\frac{v_y}{v_x}

\theta = tan^{-1}\frac{196.97}{53.03} = 74.9 degree

3 0
4 years ago
What is the equivalent resistance of a 7ohm resistor and a 93 ohm resistor connected in parallel? PLEASE HELP ASAP​
lukranit [14]

When you have several resistors in parallel, their equivalent resistance is the reciprocal of the sum of their individual reciprocals.

When there are only two of them, it gets a lot easier.  In that case, their equivalent resistance is equal to

(their product) divided by (their sum).

Equivalent = (7 x 93) / (7 + 93)

Equivalent = (651) / (100)

<em>Equivalent = 6.51 ohms </em>.

7 0
4 years ago
For an object to be classified as a ____, it must meet certain definite criteria: It must be massive enough to pull itself into
Orlov [11]

Answer:

a planet

Explanation:

a planet is one which exerts these properties and therefore is the answer

5 0
4 years ago
1. Which of the following identifies the part of blood shown in B and describes its function? (1 point)
Lelechka [254]
White blood cells fight boy invaders to the body.
6 0
3 years ago
why does the number 54289.00 have seven significant figures and not five? explain using the rules of significant figures
SCORPION-xisa [38]

The way I see it, depending on what the number represents, the number in the decimals spot could mean something significant. hope this helps :)

7 0
3 years ago
Read 2 more answers
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