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3 years ago

Which of the following explains why parallax is used to measure stars?

Physics

2 answers:

enyata [817]3 years ago

7 0

D, it provides greater accuracy for measuring stars far from the earth.

ale4655 [162]3 years ago

7 0

The answer is "It provides greater accuracy for measuring stars <u>near</u> the earth."

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what is the mass of vertical column of air that exerts pressure of 1 atm over a10m by 10m square surface

Oksana_A [137]

Answer:

$m=1.01\times 10^6\ kg$

Explanation:

Given that,

Pressure, P = 1 atm = 101325 Pa

Area of the square surface, A = 10² = 100 m²

We need to find the mass of vertical column of air. We know that, pressure is equal to the force acting per unit area. So,

$P=\dfrac{mg}{A}\\\\m=\dfrac{PA}{g}\\\\m=\dfrac{101325\times 10^2}{10}\\\\m=1.01\times 10^6\ kg$

So, the required mass of the vertical column of air is $1.01\times 10^6\ kg$ .

4 0

3 years ago

A well chosen lifetime activity is something that should hold a person's interest for a long time.

Masteriza [31]

Answer:

true

Explanation:

as long as you are interested, you are happy

4 0

3 years ago

A measure of how far an object has moved from a starting point

Anvisha [2.4K]

Volume??? velocity??????

5 0

4 years ago

While standing at the edge of the roof of a building, a man throws a stone upward with an initial speed of 6.95 6.95 m/s. The st

qwelly [4]

Answer:

18.1347 m/s

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s² = a

$v^2-u^2=2as\\\Rightarrow s=\dfrac{v^2-u^2}{2a}\\\Rightarrow s=\dfrac{0^2-6.95^2}{2\times -9.81}\\\Rightarrow s=2.4619\ m$

Total height the ball falls is 2.4619+14.3 = 16.7619 m

$v^2-u^2=2as\\\Rightarrow v=\sqrt{2as+u^2}\\\Rightarrow v=\sqrt{2\times 9.81\times 16.7619+0^2}\\\Rightarrow v=18.1347\ m/s$

The speed at which the stone reaches the ground is 18.1347 m/s

8 0

4 years ago

What is the water potential of pure water?

DanielleElmas [232]

Hey :)

The water potential of pure water<span> in an open container is zero because there is no solute and the pressure in the container is zero</span>

3 0

3 years ago