Answer:
366.90149 m/s
923.821735 J
324.734 J
Initial Kinetic energy > Final kinetic energy
Explanation:
= Mass of block = 0.072 kg
= Mass of bullet = 4.67 g
= Initial Velocity of block = 0
= Initial Velocity of bullet = 629 m/s
= Final Velocity of block = 17 m/s
= Final Velocity of bullet
In this system the linear momentum is conserved
Final Velocity of bullet is 366.90149 m/s
The initial kinetic energy
The final kinetic energy
Initial Kinetic energy > Final kinetic energy
Answer:
D
Explanation:
A and C are balanced, B has a resultant force of 5N right, and D has a resultant force of 20N right.
The molecules of ice stick together in the process of cohesion. They are tightly packed so there isn't much room to move. Liquid water is a looser hold. The molecules can go past one another, and they will take the shape of whatever container they occupy. Water vapor is loosely contained, and it will will fill whatever container it is kept in, and it will take its shape, too.
Under general relativity, there is no 'before the Big Bang'. The problem is that time is itself a part of the universe and is affected by matter and energy. Because of the huge densities just after the Big Bang, time itself is warped in such a way that it cannot go back before that event. It is somewhat like asking what is north of the north pole.
The conservation of matter and energy states that the total amount of mass and energy at one time is the same at any other time. Notice how time is a crucial part of this statement. To even talk about conservation laws, you have to have time.
The upshot is that the Big Bang did not break the conservation laws because time itself is part of the universe and started at the Big Bang and because the conservation laws need to have time in their statements.
Avogadro's number: 6.02 x 10^23 atoms is present in 1mol of a solid (i.e. 22, 400 cm3)
Hence, in 1 cm3, 6.02 x 10^23 /22400 atoms is present = 2 x 10 ^ 19 atoms.
