Answer:
θ= 5 radian
Explanation:
Given data:
Radius r = 0.70 m
Initial angular speed ω_i = 2rev/s
Time t = 5 s
Final angular speed ω_f =0
so we have angular displacement

putting values
= 5 rad
Answer:

Explanation:
Given that,
The length of a simple pendulum, l = 2.2 m
The time period of oscillations, T = 4.8 s
We need to find the surface gravity of the planet. The time period of the planet is given by the relation as follows :

Put all the values,

So, the value of the surface gravity of the planet is equal to
.
Answer:
271248.75 N
Explanation:
= Density of air = 1.14 kg/m³
v = Velocity of wind = 45 m/s
A = Area = 235 m²
From Bernoulli's principle we have the relation

Force is given by

Force due to the jet stream on the roof is 271248.75 N