Answer:
10 kJ
Explanation:
W = Fd
W = (μN)(vt)
W = μ(mg)vt
W = 0.7(42.9)(9.81)(9)(3.8)
W = 10,075.12506 J
W ≈ 10 kJ
 
        
             
        
        
        
Answer:
v=32.9m/s
Explanation:
The acceleration needed to mantain a circular motion of radius r and speed v is given by the equation 
This is the centripetal acceleration. The person will feel what is called a centrifugal acceleration, of the same value, because he is not in an inertial frame (thus subject to fictitious forces, product of inertia).
We want to know the speed of his head when it is subject to 12.5 times the value of the acceleration of gravity while moving on a 8.84m radius circle, so we must do:

 
        
             
        
        
        
<span>According to Sternberg, consummate love includes:
This is the answer:
</span><span>B.	intimacy, commitment, and passion
</span>
These three are the components of love in Sternberg's Triangular Theory of Love.
Hope this helps.
        
                    
             
        
        
        
Explanation:
Given that,
Rate of cooling of air 
Initial temperature= 80°C
Final temperature = 5°C
We need to calculate 
Using newton's law of cooling


Where, 
Here,  
 
 = 25°C  (surrounding temperature)
 = 25°C  (surrounding temperature)
dt = 1 minute

Put the value into the formula



Hence, This is the required answer.
 
        
             
        
        
        
Explanation:
It is given that,
Length of the helicopter, l = 3.1 m
The helicopter rotates, the length of helicopter will become the radius of circular path, r = 3.1 m
Angular speed of the helicopter, 
(a) The centripetal acceleration in terms of angular velocity is given by :



(b) Let v is the linear speed of the tip. The relation between the linear and angular speed is given by :


v = 90.89 m/s

Hence, this is the required solution.