Answer:
Explanation:
ΔE = Δm × c^2
where,
ΔE = change in energy released with respect to change in mass
= 1.554 × 10^3 kJ
= 1.554 × 10^6 J
Δm = change in mass
c = the speed of light.
= 3 × 10^8 m/s
Equation of the reaction:
2H2 + O2 --> 2H2O
Mass change in this process, Δm = 1.554 × 10^6/(3 × 10^8)^2
= 1.727 × 10^-11 kg
The change in mass calculated from Einstein equation is small that its effect on formation of product will be negligible. Hence, law of conservation of mass holds correct for chemical reactions.
Answer:
black will be hotter because black paint absorbs light and white reflects it.
Answer:37 J
Explanation:
Given
Step :1
Heat added Q=44 J
Work done=-20 J
![\Delta E_1=Q+W=44-20=24 J](https://tex.z-dn.net/?f=%5CDelta%20E_1%3DQ%2BW%3D44-20%3D24%20J)
Step :2
Heat added Q=-61 J
work done ![W_2](https://tex.z-dn.net/?f=W_2)
![\Delta E_2=Q+W_2](https://tex.z-dn.net/?f=%5CDelta%20E_2%3DQ%2BW_2)
![\Delta E_2=61+W_2](https://tex.z-dn.net/?f=%5CDelta%20E_2%3D61%2BW_2)
![\Delta E_1+\Delta E_2=0](https://tex.z-dn.net/?f=%5CDelta%20E_1%2B%5CDelta%20E_2%3D0)
as the process is cyclic
![44-20-61+W_2=0](https://tex.z-dn.net/?f=44-20-61%2BW_2%3D0)
![W_2=37 J](https://tex.z-dn.net/?f=W_2%3D37%20J)
work done in compression is 37 J
Answer:
u = 1.77 m/s
Explanation:
Conservation of momentum
2250(10.3) + 3160u = (2250 + 3160)(5.32)
u = 1.77 m/s