The best answer to the question that is being stated above would be the first choice. To disprove the claims of the student that you need more protons to have more reactivity, then you proceed to compare the reactivities of lithium (Li) and krypton (Kr). Krypton has more protons than Lithium, but it is less reactive because it is a noble gas.
Explanation:
This is one of those great problems that is harder to read than to solve!
Remember the following...
Power is the amount of work done over time.
and that work is Force times distance.
and that Force is just mass times acceleration.
So... nesting all the equations together we might get something that looks like.
We know the power, the time, the acceleration (at this given time) and the mass. We can then solve for d.
Plug and chug!
Answer:
V = 6.65 [volt]
Explanation:
We must first find the power generated, power is defined as the amount of energy consumed or generated in a given time.
where:
P = power [w]
E = energy = 40 [J]
t = time = 30 [s]
Now we can calculate the voltage or potential drop by means of the power, the power is calculated by means of the product of the voltage by the current.
where:
V = voltage [volts]
I = current = 200mA = 0.2 [A]