Plz help ASAP. Will rate ur ans ASAP For a mass suspended on a spring in the ver
ID: 1486087 • Letter: P
Question
Plz help ASAP. Will rate ur ans ASAP
For a mass suspended on a spring in the vertical directions, the time for one complete oscillation will depend on: What is the minimum amount of energy required to completely melt a 7.25.kg lead brick which has a starting temperature of 18.0 degree C? The melting point of lead is 328 degree C?. The specific heat capacity is 128 3/(kg. degree C) and its latent heat of function is 23.200 J/kg. Complete the following statement The term heat most accurately describes Consider two ideal gases. A and B, at the same temperature The rms speed of the molecules of gas A is twice that of gas B. how does the molecular mass of A compare to that of B? When a block of wood of volume = 50 cm^3 is floating on water, and a block of iron of the same volume is submerged at depth = h, and sinking.Explanation / Answer
12.
here the correct answer is
d) the time does not depend on any of the above
13.
Step one
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Find the heat needed to get the brick up to it's melting point.
m = 7.5 kg
t1 = 18oC
t2 = 328oC
Specific heat = 128J/kg oC
Note the units of the specific heat. Really important. It's joules / (kg oC) That means you need you mass in Kg and your temperature in Celcius. You have those things. No conversions needed.
Also ...
You want the units to cancel so that only Joules are left. That means the temperature and specific heat and mass aare multiplied.
Q = m * c * ( t2 - t1 )
Q = 7.25 kg * 128 J/(kg oC) * (328 - 18 )oC
Q = 287700 J
Step Two
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Melt the stuff.
Add enough heat to overcome the heat of fusion.
Q = H * m
H = 23200 J/kg
m = 7.25 kg
Again, no concersions and you are multiplying.
Q = 23200 J / kg * 7.25 kg
Q = 168 200 J
Step three
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Find the total
Q_total = 287700 J + 168 200 J = 455900 J
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