[填空题]
A jet aircraft is acceleru)32n 8)(z u gvi1r x(moedqvratinrna5kse :k,2ed.hc- dg at 3.5 $\mathrm{~m} / \mathrm{s}^{2}$ at an angle of 45$^{\circ} $ above the horizontal. What is the total force that the cockpit seat exerts on the 75$-\mathrm{kg} $ pilot? N $^{\circ} $
