what is the correct energy transformation in a hot air balloon? chemical>thermal>kinetic mechanical>sound>electrical chemical>light>electrical kinetic>mechanical>light

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?