You can tell whether velocity is changing because velocity is the rate/speed of motion of something in a direction either it increase or decrease in the speed or a change in its direction that will causes its velocity to change.
Answer:
Sirius
Explanation:
On the HR diagram Sirius is the closet.
Answer:
s = 1800 m = 1.8 km
Explanation:
The distance, the speed, and the time of reach of the sound are related by the following formula:
![s = vt](https://tex.z-dn.net/?f=s%20%3D%20vt)
where,
s = distance
v = speed
t = time
FOR WATER:
---------------------- eq (1)
where,
s = distance between ship and diver = ?
= speed of sound in water = 1440 m/s
t = time taken by sound in water
FOR AIR:
---------------------- eq (2)
where,
s = distance between ship and diver = ?
= speed of sound in water = 344 m/s
t + 4 s = time taken by sound in water
Comparing eq (1) and eq (2),because distance remains constant:
![v_wt=v_a(t+4\ s)\\\\(1440\ m/s)t = (344\ m/s)(t+4\ s)\\(1440\ m/s - 344\ m/s)t=1376\ m\\t = \frac{1376\ m}{1096\ m/s}](https://tex.z-dn.net/?f=v_wt%3Dv_a%28t%2B4%5C%20s%29%5C%5C%5C%5C%281440%5C%20m%2Fs%29t%20%3D%20%28344%5C%20m%2Fs%29%28t%2B4%5C%20s%29%5C%5C%281440%5C%20m%2Fs%20-%20344%5C%20m%2Fs%29t%3D1376%5C%20m%5C%5Ct%20%3D%20%5Cfrac%7B1376%5C%20m%7D%7B1096%5C%20m%2Fs%7D)
t = 1.25 s
Now using this value in eq (1):
![s = (1440\ m/s)(1.25\ s)](https://tex.z-dn.net/?f=s%20%3D%20%281440%5C%20m%2Fs%29%281.25%5C%20s%29)
<u>s = 1800 m = 1.8 km</u>
The electrical forces pulls nucleus apart