Q1. IP Halley's Comet Halley's Comet, which passes around the Sun every 78 years, has an elliptical orbit. When closest to the Sun (perihelion) it is at a distance of 8.823 x 10^10 m and moves with a speed of 54.6 km/s. The greatest distance between Halley's Comet and the Sun (aphelion) is 6.152 x 10 ^ 12 m. compute its speed at aphelion.

Q2. A 5500 kg helicopter hovers at a fixed height. The rotor blades send air downward at 60 m/s. What mass of air must pass throughout the blades every second to generate enough thrust to hold the helicopter in place?