Answer:
Work hasn't been done by Michael because no distance was covered.
Explanation:
Workdone is given by the formula;
Where;
W is the work done
F represents the force acting on a body.
s represents the distance covered by the body.
Hence, work hasn't been done by Michael because no distance was covered, as the table didn't move at all. Therefore, work done is zero.
No, Greenhouse gases in the air, mainly carbon dioxide, methane and water vapor, trap radiation from the Sun and act like a thermal blanket around the planet. Without the greenhouse effect, the Earth would have an average temperature of -18 °C and be covered in ice. Life as we know it would not be able to survive.
Black hole, neutron Star, or super nova
With the input of 68 J of energy, the temperature rises by 13 K, and the molar heat capacity of gallium is 25.86 J/(mol*K)
68 J * 25.86 J/(mol·K) * x mol=13 K
x=13/(68*25.86)=0.00739 mol
Molar mass of gallium is 69.723 g/mol, making the mass of this sample 0.515 g of gallium:
0.151 g = 68.723 g/mol * 0.00739 mol
The density of gallium is 5.91 g/cm^3, making the volume of this sample
0.872 cm^3 of gallium:
0.872 cm^3 = (0.515 g) / (5.91 g/cm^3)