1. A jet aircraft is accelerating at 3.8 m/s 2 as it climbs at an angle of 18° above the horizontal.

1. A jet aircraft is accelerating at 3.8
m/s2 as it climbs at an angle of 18° above the horizontal (Fig. 4-58).
What is the total force that the cockpit seat exerts on the 75-kg pilot?

2. An elevator in a tall building is
allowed to reach a maximum speed of 3.5 m/s going down. What must the tension
be in the cable to stop this elevator over a distance of 2.6 m if the elevator
has a mass of 1450 kg including occupants?