Answer:
74dB
Explanation:
Sound intensity is inversely proportional to the square of the distance. Thus, a house four times closer hears a sound 16x more intense.
The dB scale is logarithmic, so 16x louder than 62 dB is equal to
62 + 10*log(16) ~= 62 + 12 = 74dB
It is possible, but very slim. The fish will move before the spear goes through its body because the fish will sense danger and feel it hit the water and automatically move
Since the speed of sound is very high, we consider the time period of thunder and lightening negligible.
Now, d = vt
thus, d = 343 x 16.2
thus, d = 5556.6 metres
Thus, we are 5556.6 metres away from lightening ( approximately)
Answer: 0.4 km/h
100 m = 0.1 km
15min./60min. = 0.25 hr
so, divide the total distance (100 m) by the total time (15 min)
0.1 km/0.25 hr = 0.4
A net force is the sum of all forces acting upon an object. A net force is capable of accelerating mass.
example: if the wheels on a bike push it forward with 5 Newtons & drag is 3 Newtons then the net force is 2 Newtons, forward.
