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3 years ago

An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has the greater mass?

Physics

1 answer:

andreev551 [17]3 years ago

6 0

Answer:

The object on earth, because earth has a bigger amount of gravity than how much the moon has.

Explanation:

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A 45 kg object has a momentum of 225 kg-m/s northward. What is the object's velocity?

IRISSAK [1]

The answer is 5.0 m/s

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3 years ago

Which city has already hosted the Olympic Games three times?

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London, it has hosted the 1908, 1948 and the 2012 summer olympics

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4 years ago

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Air is a solution of 78% nitrogen, 21% oxygen and 1% other gases. Which part of this solution is the solvent?

Tom [10]

The answer is 78%. i got it right

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3 years ago

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A 2.64-kg copper part, initially at 400 K, is plunged into a tank containing 4 kg of liquid water, initially at 300 K. The coppe

marin [14]

Answer:

a) $T_f=305.7049\ K$

b) $\Delta S=313.51\ J.K^{-1}$

Explanation:

Given:

mass of copper, $m_c=2.64\ kg$

initial temperature of copper, $T_{ic}=400\ K$

specific heat capacity of copper, $c_c=385\ J.kg^{-1}.K^{-1}$

mass of water, $m_w=4\ kg$

initial temperature of water, $T_{iw}=300\ K$

specific heat capacity of water, $c_w=4200\ J.kg^{-1}.K^{-1}$

<u>∵No heat is lost in the environment and the heat is transferred only between the two bodies:</u>

Heat rejected by the copper = heat absorbed by the water

$2.64\times 385\times (400-T_f)= 4\times 4200\times (T_f-300)$

$T_f=305.7049\ K$

<u>Now the amount of heat transfer:</u>

$Q=m_c.c_c.(T_{ic}-T_{f})$

$Q=2.64\times 385\times (400-305.7049)$

$Q=95841.5841\ J$

∴Entropy change

$\Delta S=\frac{dQ}{T}$

$\Delta S=\frac{95841.5841}{305.7049}$

$\Delta S=313.51\ J.K^{-1}$

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4 years ago

One of the principal difficulties in establishing the theory of continental drift (the idea that tectonic plates drift around on

iragen [17]

Answer:

The energy that drives this movement is heat within the earth, this heat comes from two main sources which are;

1) residual heat left over from the formation of our planet billions of years ago.

2) The radioactive decay of naturally occurring chemical elements (notably uranium, thorium, and potassium ) in the earth releases energy in the form of heat. These two sources of heat warm Earth’s mantle and cause it to rise and sink, this rising and sinking creates a convectional movement of earth mantle.

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4 years ago