Sn is Tin which has 50 atomic number
it means it has 50 electrons in its outer shells
+2 shows its valency
plus sign comes when electrons are removed from an atom
so here 2 electrons are removed from Sn atom
remaining electrons are 50-2
48 electrons
Answer:
Approximately .
Explanation:
Let denote the distance between the hikers and the mountain.
The sound wave from the hikers need to travel a distance of to reach the mountain. The echo comes back at the hikers almost immediately after that and would need to travel the same distance, , to reach the hikers.
Hence, the between the shout and the echo is the time it takes for sound to travel a distance of - twice the distance between the hikers and the mountain.
Distance that sound travels in :
.
The distance between the hikers and the mountains would be:
.
Answer:
V= 14.2m/s
Explanation:
We know that acceleration= dv/dt
So 16m/s²=dv/ dt = v dv/ds
So this wil be
Integral of 16m/s² ds [at 2,2]= integral of v dv at[ 0, v]
So 16[s (3/2)/3/2] at ( s,3) = v²/2
At s= 6m
So v² = 64/3( 6^1.5-3^1.5)
= 14.2m/s
Answer:
D) 30.6J
Explanation:
Because:
gravitational potential energy=mass×gravitational field strength×height
1.3kg×9.8m/2squared×2.4m
= 30.6J
When describing voltage, current, and resistance, a common analogy is a water tank. In this analogy, charge is represented by the water amount, voltage is represented by the water pressure, and current is represented by the water flow.