It has been suggested that the surface melting of ices plays a role in enabling speed skaters to achieve peak performance. Carry out the following calculation to test this hypothesis. At 1 atm pressure, ice melts at 273.15 K, AH fusion=6010 J mol¹, the density of ice is 920 kg m³, and the density of water is 997 kg m-³. A. What pressure is required to lower the melting point by 4 °C? B. Assume that the width of the skate in contact with the ice has been reduced by sharpening to 19x10-3 cm, and the length of the contact area is 18 cm. If a skater of mass 78 kg is balanced on one skate, what pressure is exerted at the interface of the skate and the ice? C. What is the melting point of ice under this pressure?

It has been suggested that the surface melting of ices plays a role in enabling speed skaters to achieve peak performance. Carry out the following calculation to test this hypothesis. At 1 atm pressure, ice melts at 273.15 K, AH fusion=6010 J mol¹, the density of ice is 920 kg m³, and the density of water is 997 kg m-³. A. What pressure is required to lower the melting point by 4 °C? B. Assume that the width of the skate in contact with the ice has been reduced by sharpening to 19x10-3 cm, and the length of the contact area is 18 cm. If a skater of mass 78 kg is balanced on one skate, what pressure is exerted at the interface of the skate and the ice? C. What is the melting point of ice under this pressure?