Answer:
Explanation:
The rod will act as pendulum for small oscillation . 
Time period of oscillation 

angular frequency ω = 2π / T 
= 
b ) 
ω = 20( given )
velocity = ω r = ω l 
Let the maximum angular displacement in terms of degree be θ .
1/2 m v ² = mgl ( 1 - cosθ ) , 
[ l-lcosθ is loss of height . we have applied law of conservation of mechanical energy .]
.5 (  ω l )² = gl( 1 - cos θ )
.5 ω² l = g ( 1 - cosθ )
1 - cosθ  = .5 ω² l /g 
cosθ = 1 - .5 ω² l /g 
θ can be calculated , if value of l is given . 
 
        
             
        
        
        
Answer:
Explained
Explanation:
The electrons get rubbed off some items onto others. This causes an excess or electron on one item and deficiency of electron on the other. Therefore an electrostatic force of attraction is produced and hence clothes often cling together after tumbling in a clothes dryer
 
        
             
        
        
        
Answer:
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Explanation:
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<span>59.027m/s^2
Centripetal force is give by F = mv^2/r
Since
F = ma
The acceleation accoiated with this centripetal force is
a=v^2/r
the radius is found by r=d/2=5.75m
velocity is found by
v=d/t
distance is the circumference of the circle
c=pi*d=11.5*3.14=36.11m
time=60s/30.6rpm=1.96s
v=36.11/1.96=18.423m/s
plugging this back in to
a=v^2/r=(18.423m/s)^2/5.75m=59.027m/s^2</span>