Can the tangent line to a velocity vs. time graph ever be vertical? Explain.

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection