If a plane travels at an average velocity of 900 km/hr, it is 531 km from Harlingen to Houston, and 7798 km from Houston to London, how long will it take to fly from Harlingen, TX to London, UK? (You can ignore the time spent in the airports, taking off, landing, etc.)

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.