Why does heat flows from hot body to cold body?
1 answer:
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Answer:
B.)Angular momentum is always conserved
Explanation:
Angular momentum is given by:
where
m is the mass of the object
v is its speed
r is the distance between the object and the centre of its circular trajectory
In absence of external torques, angular momentum is always conserved. That means that for the spinning star, if its radius r decreases (because it shrinks), in order for L (the angular momentum) to be conserved, the speed (v) must increases, therefore the spinning star speeds up.
So, the correct choice is
B.)Angular momentum is always conserved
Explanation:
In the figure attached:
A boy travels AB distance of 100 m, with speed of 1.00 m/s
AB = 100 m
After reaching at point B he stops there at for 30 seconds.
After , 30 seconds he he comes back to his initial position that is A with steady speed of 1.00 m/s.
Distance covered from B to A= 100 m
Time taken by him during coming back=
After returning to to point A he turns left and moves towards point C with speed of 1.5 m/s for 2 minutes.
Distance of AC = ?
AC = 180 m
The total time of his round trip is:T
The total distance: D
D = AB + BA (returning) + AC=100 m + 100 m + 180 m = 380 m[/tex]
The total displacement of boy:
Displacement is the shortest distance between the initial point and final point.
He first walked to point B from A and then came back to A . And after that walking to point C from A.So, the final displacement (d) is from A to C.
d = AC = 180 m
The total displacement of boy is 180 m.
The average speed of the boy is given by:
The average velocity of the boy is given by:
