ΒγΕ the answer should be a hot day
Answer:
Speed of sound inside metal is ≅ 8200 
Explanation:
Given :
Length of metal bar
m
From general velocity equation,

Where
speed of sound in air = 343 
For finding time from above equation,


sec
Since pulses are separated by
sec
So we take time difference,

So speed of sound in metal is,



Answer:
The the average magnitude of the force exerted on the ball by the floor
N
Explanation:
Given:
Mass of ball
kg
Initial speed 
Rebound speed 
Contact time interval
sec
For finding the average magnitude of the force on the ball by the floor is given by,

Here 


N
Therefore, the the average magnitude of the force exerted on the ball by the floor
N
Answer:
Mass = 1133.33 kg (Approx.)
Explanation:
Given:
Momentum = 2.04 x 10⁴ kg[m/s]
Velocity = 18 m/s
Find:
Mass
Computation:
Mass = Momentum / Velocity
Mass = [2.04 x 10⁴] / 18
Mass = 1133.33 kg (Approx.)
A. Increase the distance between the effort and the fulcrum