Answer:
1 x 10 -10 whisper at 1m distance.
Explanation:
- Properly fitted ear plugs an reduce noise form 15-30db. Although they are better for low frequency
F(of spring)=230x=ma=3.5(5)=17.5=230x; x=0.07m.
Answer:
A
Explanation:
The next step would be precipitation falling
Answer:0.61 m
Explanation:
Given
Initial velocity (u)=7.40 m/s
launch angle 
height of fence=0.7 m
Trajectory of Projectile is given by
For x=2.1 m
At x=2.1 m Y=1.31
therefore Fox clear fence by a margin =1.31-0.7=0.61 m
Kinetic Energy is defined by 1/2 times the mass times the velocity squared.
KE = (1/2)mv2