The value of the underlined 8 is, hundred billion's. Hope this helped!
Given:
m = 555 g, the mass of water in the calorimeter
ΔT = 39.5 - 20.5 = 19 °C, temperature change
c = 4.18 J/(°C-g), specific heat of water
Assume that all generated heat goes into heating the water.
Then the energy released is
Q = mcΔT
= (555 g)*(4.18 J/(°C-g)*(19 °C)
= 44,078.1 J
= 44,100 J (approximately)
Answer: 44,100 J
Answer:
Time constant of RC circuit is 0.105 seconds.
Explanation:
It is given that,
Resistance, ![R=50\ K\Omega=5\times 10^4\ \Omega](https://tex.z-dn.net/?f=R%3D50%5C%20K%5COmega%3D5%5Ctimes%2010%5E4%5C%20%5COmega)
Capacitance, ![C=2.1\ \mu F=2.1\times 10^{-6}\ F](https://tex.z-dn.net/?f=C%3D2.1%5C%20%5Cmu%20F%3D2.1%5Ctimes%2010%5E%7B-6%7D%5C%20F)
We need to find the expected time constant for this RC circuit. It can be calculated as :
![\tau=R\times C](https://tex.z-dn.net/?f=%5Ctau%3DR%5Ctimes%20C)
![\tau=5\times 10^4\times 2.1\times 10^{-6}](https://tex.z-dn.net/?f=%5Ctau%3D5%5Ctimes%2010%5E4%5Ctimes%202.1%5Ctimes%2010%5E%7B-6%7D)
![\tau=0.105\ s](https://tex.z-dn.net/?f=%5Ctau%3D0.105%5C%20s)
So, the time constant for this RC circuit is 0.105 seconds. Hence, this is the required solution.