Major help please ! 1) Which of the following statements is true?
A) in free space, X-rays move faster than infrared light.
B) both X-rays and visible light can penetrate the Earth's atmosphere
C) the right ascension is expressed in hours and minutes.
D) an electron is negatively charged, and a neutron is positively charged

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

What is the relationship between the direction of motion of the balloon and the wind currents