A copper rod at 25°C is 2.5 m long. How long would it take a sound to move through the rod from one end to another? how would I
2 answers:
Answer;The time taken by they sound to move from one end of the rod to another end is 0.00054 seconds.
Explanation;
Speed of sound in the copper = 4600 m/s
Length of the copper rod = 2.5 m
Distance covered by the sound = length of the copper
The time taken by they sound to move from one end of the rod to another end is 0.00054 seconds.
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Answer:
Explanation:
For an object to move with constant velocity, the acceleration of the object must be zero:
.
As the net force equals acceleration multiplied by mass , this must mean:
.
So, the sum of the three forces must be zero:
,
this implies:
.
To obtain this sum, its easier to work in Cartesian representation.
First we need to define an Frame of reference. Lets put the x axis unit vector pointing east, with the y axis unit vector
pointing south, so the positive angle is south of east. For this, we got for the first force:
,
as is pointing north, and for the second force:
,
as is pointing west.
Now, our third force will be:
But, we need the magnitude and the direction.
To find the magnitude, we can use the Pythagorean theorem.
this is the magnitude.
To find the direction, we can use:
and this is the angle south of east.