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U-235, an alpha emitter with a half-life of 703 million years.
How long amount of U-235 to reach 1/2 of its initial amount? What do potassium and krypton have in common? A women of mass 70 kg. traveling in an elevator. If the elevator is accelerating downward at 0.5g, what is the reading on the scale in kg? The number 0.0035880 expressed correctly using scientific notation is? Determine a massa de um corpo que possui um peso de 650 N,considerando 10m/s²?