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Masja [62]
3 years ago
7

Why earth have gravity?

Physics
1 answer:
Yuki888 [10]3 years ago
4 0

On earth there is a force within the planet. This force creates a sort of magnet to keep the planet's being and thing on it together. This force also has a role in the solar system as it helps it move.

The source: https://spaceplace.nasa.gov/what-is-gravity/en/

Hope i helped

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4 0
3 years ago
The average specific heat of the human body is 3.6 kJ/kg·°C. If the body temperature of a(n) 96-kg man rises from 37°C to 39°C d
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Answer:

691200 J

Explanation:

From specific heat capacity,

ΔQ = cmΔt.................. Equation 1

Where ΔQ = increase in thermal energy, c = specific heat capacity of the body, m = mass of the man, Δt = rise in temperature.

Given: c = 3.6 kJ/kg.°C = 3600 J/kg.°C, m = 96 kg, Δt = 39-37 = 2 °C.

Substitute into equation 1

ΔQ = 3600×96×2

ΔQ = 691200 J.

Hence the change in the thermal energy of the body = 691200 J

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sergij07 [2.7K]

Answer:

Time = 6 years

Explanation:

First, we will calculate the no. of half life periods required to reduce the mass of Protactinium to the given value:

m' = \frac{m}{2^{n} } \\\\2^n = \frac{m}{m'}

where,

n = no. of half-life periods = ?

m = initial mass = 86.3 g

m' = remaining mass = 10.8 g

Therefore,

2^n = \frac{86.3\ g}{10.8\ g}\\\\2^n = 8\\2^n = 2^3

Since the bases are the same. Therefore equating powers:

n = 3

Now we calculate the time:

Time = (n)(Half-Life)\\Time =(3)(2\ years)

<u>Time = 6 years</u>

3 0
2 years ago
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