3 years ago

A tray filled with ice is removed from the freezer. After a short period of time, the ice begins to melt.

Physics

1 answer:

Sav [38]3 years ago

3 0

A: decreases in specific heat capacity

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A sample of helium behaves as an ideal gas as energy is

alisha [4.7K]

Answer:

0.0321 g

Explanation:

Let helium specific heat $c_h = 5.193 J/g K$

Assuming no energy is lost in the process, by the law of energy conservation we can state that the 20J work done is from the heat transfer to heat it up from 273K to 393K, which is a difference of ΔT = 393 - 273 = 120 K. We have the following heat transfer equation:

$E_h = m_hc_h \Delta T = 20 J$

where $m_h$ is the mass of helium, which we are looking for:

$m_h = \frac{20}{c_h \Delta T} = \frac{20}{5.193 * 120} \approx 0.0321 g$

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3 years ago

Sound travels faster in: steel water sir

alukav5142 [94]

Sound travels better in water

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A Smart Car, which has a mass of 1000 kg, is going 20 m/s. When it hits the barrier, it stops with a time of 0.5 seconds. What i

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Answer:

need points sorry god bless

Explanation:

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3 years ago

What would be the daughter product of the beta decay of lead-212 and what would be the daughter product of the alpha decay of po

kati45 [8]

Answer:

lead with Z = 82 is transformed into Bismuth with Z = 73

The Po with Z = 84 becomes Pb with Z = 82

Explanation:

Beta decay occurs when a neutron emits an electron and an anti neutrino from the atomic nucleus, therefore the atomic number of the material increases by one unit.

Pb + e + ν → Bi

lead with Z = 82 is transformed into Bismuth with Z = 73

In alpha decay, a helium nucleus is emitted from the nucleus of the atom, therefore the atomic number decreases by two units.

Po +α → Pb

The Po with Z = 84 becomes Pb with Z = 82

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3 years ago