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1 answer:
Answer:
Because the person is changing direction
Explanation:
The acceleration of an object is defined as the rate of change of velocity:
where
is the change in velocity
is the change in time
We must keep in mind that velocity is a vector, consisting of a speed and a direction. Therefore, a change in velocity means:
- either a change in the speed of the object, or
- a change in its direction
In this problem, the person is running around the track with a constant speed. However, his velocity is constantly changing (because the track is circular), this means that the change in velocity is not zero, and so there is a non-zero acceleration.
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Answer:
The mass of the beam is 0.074 kg
Explanation:
Given;
length of the uniform bar, = 1m = 100 cm
Set up this system with the given mass and support;
0-----------------33cm-----------------------------------100cm
↓ Δ ↓
0.15kg m
Where;
m is mass of the uniform bar
Apply the principle of moment to determine the value of "m"
sum of anticlockwise moment = sum of clockwise moment
0.15kg(33 - 0) = m(100 - 33)
0.15(33) = m(67)
Therefore, the mass of the beam is 0.074 kg