If F =m*a 
 and the question says how much force the s needed to accelerate a 68kg skier to a rate of 1.2ms^-2
 Then F = 68*1.2
        
             
        
        
        
Circular Motion does occur on earth, so yes, true
        
                    
             
        
        
        
All magnets possess a property called polarity--that is, a magnet's power of attraction is strongest at its opposite ends, usually called the north and south poles. The north and south poles attract each other, but north repels north and south repels south. All magnets attract iron. 
 
        
             
        
        
        
To solve this problem it is necessary to apply the concepts related to Kinetic Energy, specifically, since it is a body with angular movement, the kinetic rotational energy. Recall that kinetic energy is defined as the work necessary to accelerate a body of a given mass from rest to the indicated speed.
Mathematically it can be expressed as,

Where
I = Moment of Inertia
 Angular velocity
Angular velocity 
Our values are given as 

A revolution is made every 4.4 seconds.


If the angular velocity is equivalent to the displacement over the time it takes to perform it then


Replacing at our previous equation we have,



Therefore the kinetic energy is equal to 