please answer this. I will mark brainliest to the most detailed answer.
Answers
Answer:
Ans 1. (a)
Radius = r
Displacement = shortest distance from initial to final position.
So,
Displacement = Diameter
= 2 X r
= 2r
Distance = lengrrth from the initial point to final point on path.
So,
Distance = half of circumference
= 1/2 X 2πr
= πr
(b).
Displacement = shortest distance ................ .
= 0 m ( As the object completes a circle and comes back to the initial point. )
Distance = length from........................ on path.
= Circumference of the circle
= 2πr
Ans 2.
Diameter = 2r
Radius = half of diameter
= 1/2 X 5
= 2.5 metres
Distance travelled by the particle
in 1 revolution = Circumference of the circle
= 2πr
= 2 X 22/7 X 2.5.
= 15.714 m
Total distance = 3 X 15.714
= 47.142 m
Displacement = 0 m ( As it came back to the initial point).
Ans 3.
The particle starts from A and moves northwards to B. It then
moves eastwards to C and then southwards to D.
Hence, the total distance covered by the particle is
d=ABBCCD=3-4-6=13 m
Now, displacement is the shortest distance be tween the inital and
the final positions. From the fiqure, it is dlear that the dsplacement is
S= AD
From the fiqure, using Pythagoras theorem
AD2 = AE2 -ED2
AE =BC= 4 m
EC=AB =3m
. ED=6-EC =3 m
AD2=42-32 =16-9= 25
:. AD=5 m
Hence, the displacement of the particle is 5 m.
Ans 4.
Distance = 30 km
Time Taken = 6 hours
Speed = Distance / Time
= 30/6
= 5 km/hr
Ans 5.
Average speed = total distance / total time.
Total distance travelled = 16+ 16= 32 m
Total time = 4+2=6s
Average speed = 32/6 = 5.33 m/s
Ans 6.
u=15m/s
v-15m/s
t=1Osec
velocity-u+v/2
15+15/2
-
-
=30/2
=15m/s as,
a body is in uniform
motion .so,there is no
change.
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Hope everyone liked it.