17. a sea breeze is a breeze blowing towards the land
18. a land breeze is a breeze blowing towards the sea
Answer:
can you put on a clearer image this one is hard to see
In order to persuade the electrons in the wire to flow, you need
a potential difference between the ends of the wire. Then the
electrons will want to get away from the more-negative end and
go to the more-positive end. If both ends of the wire are at the
same potential, then the electrons have no reason to go anywhere,
and they just stay where they are.
Choice-d says this.
Answer:
Explanation:
Given
magnitude of vector=8.7 m/s
Direction
Therefore vector x component is
=-2.104
i.e. it is acting in negative x axis
vector y component
Therefore it lies in negative y axis
Judging vector x and y component
It lies in third quadrant
Answer:
0.3967mg of sodium-24 are left
Explanation:
If the half life of radioactive element (which is sodium-24 here) is , then at the end of this time the number of atoms in the sample will become half i.e. 1/2 .
if the original amount of atoms is N°. The formula for calculating the remaining atoms (N) left in the sample after t half lives would be:
Here, in this question,
Given amount of sodium-24 = N° = 13 grams
Half life of sodium-24 = t = 15
and Remaining amount of sodium after 45 hours = N = ?
Therefore, using the given Forumla: