Answer:
1 rst question is 3.13
2nd question is 1rst choice and/or 2nd choice.
3rd is D
Step-by-step explanation:
1rst QUESTION
Solve the potential energy at point B
PE = mgh
Where m is the mass
G is the acceleration due to gravity 9.8 m/s2
H is the height
PE = ( 1.5 kg) ( 9.8 m/s2) (0.5 m)
PE = 7.35 J
Solve the velocity using the
KE = 0.5mv^2
Where ke is the kinetic energy
M is the mass
V is the velocity
Since all energy is converted to KE
So KE = PE
7.35 = 0.53(1.5) v^2
V = 3.13 m/s
2nd QUESTION
The first choice i correct. The second is also correct as it should obey the Law of Conservation of mass. The third choice is incorrect. It depends on the nature of the system. For example, for an ideal gas, you can define at least 2 parameters to set the system boundaries. The fourth choice is incorrect, a system can be theoretical or practical. Hence, the answers are the first and second choices.
3rd QUESTION
I can’t really explain this correctly.