The snow or ice holds back the movement of the sled causing friction between them
You need to do spring constant x extension
From the reaction, we see that for every 2 moles of Al
reacted, 852 kJ of energy is released. So convert the mass given to moles:
moles Al = 48.7 g / (26.98 g/mol)
moles Al = 1.805 mol
So the energy evolved is:
Energy = -852 kJ / 2 mol * 1.805 mol
<span>Energy = -769 kJ</span>
Answer:
Tension= 4,373.70N
Explanation:
Ma= Sum of forces
Horizontal forces are:
0= T1costheta=T2costheta
T1=T2=T
Vertical forces are:
Ma= T1sin8°+ T2sin8° - mg
Ma= 2Tsin8° - mg
Therefore ,
T= m(a+g)/(2sin8°)
T= 68(8.10+9.8)/2×0.139
68(17.9)/0.2783
T= 4373.697
T= 4373.70N