Answer:
Sound waves travels fastest in solids.
Sound waves travels slowest in gases.
Explanation:
Sound waves travels fastest in solids.
Sound waves travels slowest in gases.
Answer:
Part a)
When rotated about the mid point

Part b)
When rotated about its one end

Explanation:
As we know that the angular acceleration of the rod is rate of change in angular speed
so we will have



Part a)
When rotated about the mid point



now torque is given as


Part b)
When rotated about its one end



now torque is given as


Answer:
The acceleration of the sprinter is 1.4 m/s²
Explanation:
Hi there!
The equation of position of the sprinter is the following:
x = x0 + v0 · t + 1/2 · a · t²
Where:
x = position of the sprinter at a time t.
x0 = initial position.
v0 = initial velocity.
t = time.
a = acceleration.
Since the origin of the frame of reference is located at the starting point and the sprinter starts from rest, then, x0 and v0 are equal to zero:
x = 1/2 · a · t²
At t = 9.9 s, x = 71 m
71 m = 1/2 · a · (9.9 s)²
2 · 71 m / (9.9 s)² = a
a = 1.4 m/s²
The acceleration of the sprinter is 1.4 m/s²
Answer:
b
Explanation:
try looking it up if u need further help google is there to help you
Answer
given,
mass of ball = 130 g = 0.13 kg
speed = 6.5 m/s
t = 9.5 ms = 0.0095 s
rebound with 42 % of initial kinetic energy
a) 

v₂ = 4.212 m/s
b) impulse is equal to change in momentum


I = 1.393 kg m/s
c) Force = 
= 
F = 146.63 N