Answer:
D.
Explanation:
Newton's Law of Gravitation states that:
If the masses of each object is small, then 
would be very small, making the gravitational force between the two objects hard to detect - as it itself would be very small.
Answer:
c. There would be a series of spectral lines in hydrogen with the longest wavelength one at 122 nm.
d. The hydrogen atom binds its electron more tightly than the sodium atom does, and would require more energy to remove its electron completely.
Explanation:
The hydrogen atom which changes from the excited state to the lower ground state, it emits light having a wavelength of 122 m. And the sodium atom also gets excited and emits light at 589 nm when it moves from the 1st excited state to the lowest excited state.
Therefore, when the electrons jumps from the 1st excited state to the ground state, only one wavelength is observed as there is only one transition.
The hydrogen atom will bind the electron tightly but the sodium atom does not and would require more energy to remove the electron the electron completely as the binding energy is higher when the electron is closer to the nucleus.
Answer:
Correct answer letter C.
Explanation:
As we see in this problem, the total linear momentum is conserved, since there are no external forces acting in that system.
So, we can say that 
or 
Now, the initial momentum is zero, because before the person starts climbing, the system (balloon plus person) are floating motionless, therefore we have:
(1)
We know that M > m, therefore, m/M < 1 and using (1) we can deduce that V(balloon) < v(person).
Finally, we can say that the balloon moves down (because of the minus sign of V(balloon)) and its speed is less than v(person). Correct answer letter C.
I hope it helps you!
Answer: Find the answer in the explanation.
Explanation:
The earth wire act as a protective conductor in which hazardous current flows to the earth. Whenever there is a faulty flow of current, the earth wire will protect an iPad with a metal casing from eddy current by allowing the faulty current to flow directly to the earth.
With the use of fuse, an iPad with a metal casing will be protected from extreme heat due to overheating or electrical overloading as a result of short circuit.
