Answer:
<h2>4000
</h2>
Explanation:
The temperature of 0.1 kg of liquid rises from 25°C to 50°C in 300 sec. Energy of 13,600 J was supplied during this time. Appartus was losing energy at the rate of 12 J/sec.
Let us assume the Specific heat capacity as .
As there is no state change from liquid to gas, only Specific heat capacity is involved. Also, work done is approximately zero because volume does not change much. So,
Energy gained = Energy required to rise the temperature
Energy gained by liquid =
∴ Specific heat capacity of liquid = 4000
Answer:
A plane
Explanation:
Since kinetic energy equal and they all have the same velocity then you know the one with the most kinetic energy is the one with the most mass, and a plane would have the largest mass.
<h3>Answer:</h3>
10cm, 19cm
Explanation:
Forgive me, I dont have a paper with me now so I cant show you the working BUT here's the rough idea...
Hooke's Law explains that the force needed to extend or compress a spring by some distance x scales linearly with respect to that distance. Take for example the picture above.
As such, the values can be placed in a linear graph, given that it goes not reach its elastic limit. So subtract 20g from 30g and you'll get 10g; subtract 16cm from 14cm makes it 2cm. Following hooke's law makes F=x, 2F=2x so 10g=2cm; 5g=1cm and 1g=0.2cm.
So, to find out how much was extended in the first figure, multiply 20g by 0.2 to get 4cm; the third figure, 30g by 0.2 to get 6cm.
Hence the answer to question one is 14-4 and 16-6 which is 10cm
Now knowing the original length, we can calculate x finding the extention. First, multiply 45g with 0.2 giving 9cm, then adding it to the original 10cm to obtain 19cm.
Hope this is understandable
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