A car on a roller coaster loaded with passengers has a mass of 2100 kg. At the lowest point of the track, the radius of curvature of the track is 125 m and the roller car has a speed of 17 m/s. What is the normal force acting on the roller coaster car at the lowest point on the track?

What is the length x of the side of the triangle below? (hint: use the cosine function)

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.