2. What must be true about two given objects for energy to be transferred as heat between them?
2 answers:
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Answer:
The angular acceleration required is 0.1765 rad/
Explanation:
The radius of the bicycle wheel has a radius of 0.42 m.
The acceleration is for time, t = 6.8 seconds.
Initial angular velocity is given as = 5.5 rad/s
Final angular velocity is given as = 6.7 rad/s
Therefore from the formula for angular speed we get
=
+ (
t), where t is the time in seconds.
Therefore we get
6.7 = 5.5 + (6.8 × )
Therefore we get the angular acceleration, =
The angular acceleration required is 0.1765 rad/
Explanation:
It is given that,
Distance, r = 3.5 m
Electric field due to an infinite wall of charges, E = 125 N/C
We need to find the electric field 1.5 meters from the wall, r' = 1.5 m. Let it is equal to E'. For an infinite wall of charge the electric field is given by :
It is clear that the electric field is inversely proportional to the distance. So,
E' = 291.67 N/C
So, the magnitude of the electric field 1.5 meters from the wall is 291.67 N/C. Hence, this is the required solution.