On August 4, 2020, an explosion estimated at 1.2 kilotons of TNT (dynamite) destroyed a port in Beirut, Lebanon. The sound from the explosion travelled at 767 mph (the speed
of sound). How long, in seconds, did it take for the sound to travel 50 km?

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

What is the binding energy of a nucleus that has a mass defect of 5.81*10-^29 kg a 5.23*10-^12 j b 3.15* 10^12 j c 1.57*10-3 j d 9.44*10^20 j