The jet water ski has reached its maximum velocity of $70 \mathrm{km} / \mathrm{h}$ when operating in salt water. The water intake is in the horizontal tunnel in the bottom of the hull, so the water enters the intake at the velocity of $70 \mathrm{km} / \mathrm{h}$ relative to the ski. The motorized pump discharges water from the horizontal exhaust nozzle of $50-\mathrm{mm}$ diameter at the rate of $0.082 \mathrm{m}^{3} / \mathrm{s}$ Calculate the resistance $R$ of the water to the hull at the operating speed.