A shopper picks up a 2 kg packet of rice with the thumb and index finger of one hand.The coefficient of friction between her finger and the wrapping is 0.3.What horizontal force must she exert to prevent the packet from slipping?
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A motorist traveling at 13 m/s aprroaches traffic lights which turn red when he is 25m away from the stop line.His reaction time(i.e. the interval between seeing the red light and applying the brakes)is 0.7s and the condition of the road and his tyres is...