Answer
given,
L(t) = 10 - 3.5 t
mass of particle = 2 Kg
radius of the circle = 3.1 m
a) torque 
     τ = 
     τ = 
     τ = -3.5 N.m
Particle rotates clockwise as i look down the plane. Hence, its angular velocity is downward. 
L decreases the angular acceleration upward. so, net torque is upward.
b) Moment of inertia of the particle
     I = m R^2
     I = 2 x 3.1²
     I = 19.22 kg.m²
     L = I ω
     ω = 
     ω = 
     ω = 
   A = 0.52 rad/s             B = -0.182 rad/s² 
 
        
                    
             
        
        
        
Answer:
sofa
Explanation:
because the sofa is heavy and the amount of friction is high due to the amount of opposite friction is pushing it back
 
        
             
        
        
        
Answer:
Animals take in oxygen and give off carbon dioxide. 
Explanation:
This is because plants take in our carbon dioxide and give off the oxygen that we as people and animals need to breathe. 
 
        
                    
             
        
        
        
Answer:
Explanation:
Let i be the angle of incidence and r be the angle of refraction .
From the figure 
Tan ( 90 - i ) = 2.5 / 8 
cot i = 2.5 / 8 
Tan i = 8 / 2.5 = 3.2 
i = 72.65°
From snell's law 
sini / sin r = refractive index 
sin 72.65 / sinr = 1.333 
sin r = .9545  / 1.333
= .72
r = 46⁰
From the figure 
Tan r  = d / 4 
Tan 46 = d /4 
d = 4 x Tan 46 
= 4 x 1.0355
=4.14 m .
 
        
             
        
        
        
In several of the questions you've posted during the past day, we've already said that a wave with larger amplitude carries more energy.  That idea is easy to apply to this question.