A hot air balloon travel two hours at a speed of 375 km/hours what distance did it travel

What are similarities and differences of reflection, refraction, diffraction and absorption?

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

Why do astronauts in the space shuttle weigh less?