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sesenic [268]
3 years ago
11

A period of one year on Earth is the time it takes Earth to

Physics
1 answer:
Kazeer [188]3 years ago
7 0

D make one revolution around the sun hope this helps

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Using calcium’s atomic structure, as shown in the image, what is this element’s atomic number?
ElenaW [278]

Answer:

Atomic number of calcium is 20.

6 0
3 years ago
Which of the following is an example of acceleration? I. A car speeds up. II. A car slows down. III. A car travels in a straight
svetlana [45]
I., II., and IV. are examples of acceleration. III. isn't.
6 0
4 years ago
A 23-newton horizontal force westward and a 23-newton horizontal force eastward act concurrently on a 10-kilogram object on a fr
BARSIC [14]
The forces cancel out each other because they are equal and opposite. Therefore the net force is 0 and there will be no acceleration

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3 years ago
A vehicle is moving at a speed of 20m/s suddenly the driver sees a fallen tree on the road, he instantly applies the brakes that
NeTakaya

Answer:

b) Distance covered before stopping.

Explanation:

If you want to find the distance d required to come to a stop starting at some initial speed v, with braking acceleration a, use the kinematic relation  

vf2 - vi2 = 2ad

vi = initial speed at the moment braking begins = v

vf = final speed = 0 (comes to a full stop)

-v2 = 2ad

d = -v2/(2a)

6 0
3 years ago
The rate of change of atmospheric pressure P with respect to altitude h is proportional to P, provided that the temperature is c
Anton [14]

Answer:

Explanation:

Rate of change of pressure with respect to heigh

\frac{dp}{dh} = k p ( given )

\frac{dp}{p} = k dh

Integrating on both sides

∫\frac{dp}{p} = ∫ k dh

lnp = kh + c , c is a constant

when h = 1000 m , p = 89.1 k Pa

ln 89.1 = 1000 k + c -------------- (1)

when h = 0 , p = 103.6 k Pa

ln 103.6 = 0 x  k + c

c = ln 103.6

Putting it in quation (1)

ln 89.1 = 1000 k + ln103.6

ln \frac{89.1}{103.6} = 1000k

k = \frac{-0.15}{1000}

= - .15 x 10⁻³

lnp = - .15 x 10⁻³ h +  ln 103.6

when h = 3000

lnp = - .15 x 10⁻³ x 3000 +  ln 103.6

= - .45 +4.64

= 4.2

p = 66.68 k Pa

b )

when h = 6358

lnp =  - .15 x 10⁻³ x 6358 +  ln 103.6

= - .9537 + 4.64

= 3.6863

39.9 k Pa.

5 0
3 years ago
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