Tritium (Hydrogen-3) is an unstable isotope with a half life of about 12 years. If a scientist analyzes a sample of it, what percentage of it remains after 24 years? 25% O 12.5% 50% 100%​

What sort of waves exhibit the doppler effect?

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel