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tester [92]
3 years ago
14

What do we use as a reference point to prove that we are always moving even when we are sitting down

Physics
2 answers:
antoniya [11.8K]3 years ago
4 0
Im not quite sure what you mean but do you mean us or the earth? If you mean us a reference is that our hearts are beating, we are breathing, we (may be) blinking, we are using our brains to do everything, etc.
mafiozo [28]3 years ago
3 0
This is a elementary question? in my opinion we could use stars. as the earth is in constant rotation, therefor we are technically still moving if we are sitting, just like being in a car, if that makes since
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neptune is an average distance of 4.5×10^12m from the sun. Estimate the length of the Neptunian year.
Vikentia [17]

As per Kepler's third law we know that

\frac{T_1^2}{T_2^2} = \frac{R_1^3}{R_2^3}

now here we know that

T_1 = year of Neptune

T_2 = year of Earth

R_1 = distance of Neptune from Sun

R_2 = Distance of Earth from Sun

so now we will have

\frac{T_1^2}{1} = \frac{(4.5 \times 10^{12})^3}{(1.5 \times 10^11)^3}

T_1^2 = 27000

T_1 = 164.3 years

so length of year of Neptune is 164.3 years

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3 years ago
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Answer:

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6 0
2 years ago
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Diffrence between:- movable pulley and fixed pully​
kotykmax [81]

Answer:

fixed pulley: A pulley system in which the pulley is attached to a fixed point and the rope is attached to the object. ... movable pulley: A pulley system in which the pulley is attached to the object; one end of the rope is attached to a fixed point and the other end of the rope is free.

Explanation:

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Explanation:

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3 years ago
After the box comes to rest at position x1, a person starts pushing the box, giving it a speed v1. when the box reaches position
KiRa [710]

As we know by work energy theorem

total work done = change in kinetic energy

so here we can say that wok done on the box will be equal to the change in kinetic energy of the system

W_p = KE_f - KE_i

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so initial kinetic energy will be ZERO

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KE_f = \frac{1}{2}mv_1^2

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W_p = \frac{1}{2}mv_1^2

so above is the work done on the box to slide it from x1 to x2

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