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Mw3spartan17
14.05.2021 •
Engineering
I need help on this
In which situation is the speed of the car constant while its velocity is changing?
The car travels down a straight track at 30 m/sec
The car travels around a circular track at 30 m/s
The car begins from rest and accelerates to 20 m/s
The car begins traveling at 30 m/s and decreases to 15 m/s
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Ответ:
b.) The car travels around a circular track at 30 m/s
Explanation:
To find - In which situation is the speed of the car constant while its velocity is changing?
a.) The car travels down a straight track at 30 m/sec
b.) The car travels around a circular track at 30 m/s
c.) The car begins from rest and accelerates to 20 m/s
d.) The car begins traveling at 30 m/s and decreases to 15 m/s
Proof -
We know that,
Speed is distance covered in a particular time
Velocity is distance covered by body in particular time in defined direction.
Now,
In a.)
Speed and direction is not changing.
So, Option a) is wrong.
In c.) and d.)
There exists a positive and negative acceleration.
Even If direction is constant, but the magnitude of speed is changing here, So, Option c) and d) are wrong.
Now,
In b.)
We can see that,
Due to circular motion, the speed of the car is constant at 30 m/s
But Due to circular motion, direction is changing continuously.
So, here speed is constant while its velocity is changing.
∴
The correct option is - b.) The car travels around a circular track at 30 m/s
Ответ:
:O
Explanation:
so what i would do its take the battery pack
strip the wires
then connect the red wire
to the red wire
and do the same for the black wire
then attach a switch
by doing the same thing
unless the fan comes with a switch
hope i helped TwT