A 60 kg block of ice is being pulled along a well-waxed floor by a rope tied around its center. The rope is taut at an angle of 55° above the horizontal. If the block accelerates at a rate of 1.8 m/s?, and friction is negligible, determine
normal force necessary to support the block of ice.

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Atomic nuclei of almost all elements consist of

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.