Answer:
Momentum, p = 7.2 g-m/s
Explanation:
It is given that,
The momentum of an object is 
We need to express momentum in any equivalent units. There can be many solutions of this problem. Some of the units of mass are gram, milligram etc. units of length are meters, mm etc.
Since, 1 kg = 1000 gram
So, 
Therefore, the momentum of the object is 7.2 g-m/s. Hence, this is the required solution.
Answer: The system internal energy is 40 Joules.
Explanation: As suggested, the formula
should be used. 70 Joules worth of thermal energy are added, and the system does 30 Joules worth of work (energy expenditure).
The answer is B because you are not using force or energy as if you were if you were to lift or push something.
what about it do you need to know love?
Answer:
D) Repeating the experiment several times and comparing the results
Explanation:
Replication of experiments allows scientists to see patterns and trends in the results of the experiments. It helps the scientist performing the experiment to see if there is precision in the results gotten and to test the integrity of the data. The results of several repetitions of the experiment can be compared and tested for consistency.
Performing this experiment severally will make the scientist know whether the dissolved oxygen contents gotten in each of the tanks are close to each other. If the results are wide apart, then the data lacks integrity and should not be used.