Answer:
  t = 0.1111 s
Explanation:
Let's reduce the magnitudes to the SI system
     d = 120 mm (1m / 1000 mm) 
     d= 0.120 m
     w = 540 rpm (2pi rad / 1 rev) (1 min / 60s)  
      w= 56.55 rad / s
When at maximum speed we can use angular kinematic relationships to find the time for a sperm revolution with zero angular acceleration
      W = θ / t
      t = θ / w
      t = 2π / 56.55
      t = 0.1111 s
 
        
             
        
        
        
Potential energy is energy stored due to its position. Thermal energy is energy released as heat
        
             
        
        
        
Answer:
T = 480.2N
Explanation:
In order to find the required force, you take into account that the sum of forces must be equal to zero if the object has a constant speed.
The forces on the boxes are:
 (1)
      (1)
T: tension of the rope
M: mass of the boxes 0= 49kg
g: gravitational acceleration = 9.8m/s^2
The pulley is frictionless, then, you can assume that the tension of the rope T, is equal to the force that the woman makes.
By using the equation (1) you obtain:

The woman needs to pull the rope at 480.2N
 
        
             
        
        
        
Answer: C
Explanation: Air
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