Una esfera hueca de aluminio que tiene un volumen de 0.1 m3 se enfría de una temperatura de 20°C a -2 °C. ¿Qué volumen final tendrá?

What is a good example of instantaneous speed

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.

Select all the correct answers. which three statements about electromagnetic radiation are true?