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maxonik [38]
3 years ago
7

If the moon were twice as far from years as it is now the following would be true

Physics
1 answer:
zubka84 [21]3 years ago
7 0
The question is incomplete.

The distance between the Moon and Earth influences: 1) the attractive gravitational force between them, 2) the tides, 3) the eclipses, 4) the period of each full turn of the moon around the Earth.

Assuming the question refers to the gravitational attraction, we must use the fact that, as per, Newton's Universal Gravitaional Law, the attractive force between the two bodies is inversely related to the square distance that separates them.

Then, if the Moon were twice as far, the gravitational pull would be one fourth (1/4) of actual pull.

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A 1.60 m tall person lifts a 2.10-kg book from the ground so it is 2.20 m above the ground. What is the potential energy of the
Viefleur [7K]

Answer:

Explanation:

Given

mass of book(m)=2.1 kg

height up to which book is lifted is (h)2.2 m

height of person (h_0)1.6 m

Potential energy of book relative to ground=mgh

PE=2.1\times 9.8\times 2.2=45.276 J

(b)PE w.r.t to person head =mg(h-h0)

=2.1\times 9.8\times (2.2-1.6)=12.348 J

work done by person in lifting box 2.2 m w.r.t floor

Word done =Potential Energy of box relative to floor=45.2 J

6 0
3 years ago
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jolli1 [7]
All living organisms need energy grow and reproduce maintain their structures, and respond to their enviorments: metabolism is the set of the processes that make energy available for cellular processes.
3 0
3 years ago
Which will have the lowest density <br>A) Ice<br>B) Steam<br>C) water​
Nesterboy [21]

Answer:

steam will have the lowest density.

Hope it will help :)

4 0
2 years ago
An object, moving with a constant velocity, travels 400 m in 25 s. What is its velocity?
Karolina [17]

v = d/t

= 400/25

= 16 m/s

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6 0
2 years ago
A concrete highway is built of slabs 18.0 m long (at 25 °C). How wide should the expansion cracks be (at 25 °C) between the slab
yulyashka [42]

To solve the problem it is necessary to apply the concepts related to thermal expansion of solids. Thermodynamically the expansion is given by

\Delta L = L_0 \alpha \Delta T

Where,

L_0 = Original Length of the bar

\Delta T= Change in temperature

\alpha= Coefficient of thermal expansion

On the other hand our values are given as,

L_0 = 18m

\alpha = 12*10^{-6}/\°C

T_2 = 52\°C

T_1= 25\°C

Replacing we have,

\Delta L = L_0 \alpha (T_2-T_1)

\Delta L = (18)(12*10^{-6})(52-25)

\Delta L = 5.832*10^{-3}m

The width of the expansion of the cracks between the slabs is 0.5832cm

7 0
2 years ago
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