The distance between a speaker and a listener is 8.0 m. Determine the frequency of the sound wave if exactly 20 waves are formed
1 answer:
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Answer:
acceleration = 1.79 m/s^2
Tension = 6817 N
Explanation:
First let's find Elizabeth's weight:
Her weight is greater than the normal force (N = 450 N), so the elevator is going downwards.
The acceleration of Elizabeth is given by:
Where P is the weight of Elisabeth, N is her normal force, m is her mass and a is the acceleration. Then, we have that:
The tension in the cable is given by:
In this case, we use the total mass, so we have:
<h2>That arrow goes 30.59 m high, it travels 211.96 m horizontally and taken 4.99 seconds to land.</h2>
Explanation:
Consider the vertical motion of ball,
We have equation of motion v = u + at
Initial velocity, u = u sin θ
Final velocity, v = -u sin θ
Acceleration = -g
Substituting
v = u + at
-u sin θ = u sin θ - g t
This is the time of flight.
Consider the vertical motion of ball till maximum height,
We have equation of motion v² = u² + 2as
Initial velocity, u = u sin θ
Acceleration, a = -g
Final velocity, v = 0 m/s
Substituting
v² = u² + 2as
0² = u²sin² θ + 2 x -g x H
This is the maximum height reached,
Consider the horizontal motion of ball,
Initial velocity, u = u cos θ
Acceleration, a =0 m/s²
Time,
Substituting
s = ut + 0.5 at²
This is the range.
Here u = 49 m/s and θ = 30 degrees
Substituting
That arrow goes 30.59 m high, it travels 211.96 m horizontally and taken 4.99 seconds to land.