Answer:
4520 kJ
Explanation:
To make a substance transition phases an energy must be applied, this is know as the latent heat.
Water has a latent heat of 40.7 KJ/mol to turn into vapor.
The molecule of water has a molecular weight of 18. This means that a mol of water weights 18 grams.
With this we can convert the latent heat to use grams instead of mols
Now, the heat needed to vaporize water is simply:
Q = m * DHvap = 2000 g * 2.26 kJ/g = 4520 kJ
Explanation:
Objects like apples, wood, and sponges are less dense than water. They will float. Many hollow things like empty bottles, balls, and balloons will also float. That's because air is less dense than water.
The correct answer is B.
B) Fossil Fuels
Answer:
9.4 N
Explanation:
m = mass of the book = 1.83 kg
= Coefficient of static friction = 0.522
= Coefficient of kinetic friction = 0.283
= Static frictional force
F = force needed to make the book move
force needed to make the book move is same as the magnitude of maximum static frictional force applied by the desk on the book
Static frictional force is given as
= mg
Hence, the force need to move the book is given as
F = = mg
F = mg
F = (0.522) (1.83 x 9.8)
F = 9.4 N