Question

Q.1 classify the following Rectilinear , circular, oscillatory Or periodic. a) Motion of your hands while running. b) motion of a train on a straight Bridge.c) motion of child on a see saw. Q.2 A car is running at a speed of 60 km/hr and takes 2 hr to reach its 4. destination.calculate travelled by the car. please help me very urgent......​

Answer 1

Given speed of the vehicle=72㎞/hr
=72×
18
5
​
=20m/s
radius of the wheel =
2
0.5
​
=0.25
initial angular velocity (ω
0
​
)=
0.25
20
​
=80rad/s
angle covered after applying brakes=20×2π=40π
let the angular retardation be −αrad/s
2

final angular momentum ω=0
putting formula ω
2
=ω
0
​

2
−2αθ
⇒0=ω
0
​

2
−2×α×θ
⇒ω
0
​

2
=2×α×θ
⇒80
2
=2×α×40×π
⇒α=
80×π
80
2

​

⇒α=
π
80
​

putting the value of π=3.14
α=25.47rad/s
2

so retardation is −25.477≅−25.5 rad/s
2
Hope this helps u it’s the question two add me as a friend