The stream of particles has kinetic energy k (in ev). the mass of particles is m and half-life t (in seconds). find the distance in which half of the particles will decay: vje t e ет к ikt 12k a) 2in(2) v b) 21n (2) vm c) 2ln(2) v m •d) 2ln(2) m 0905 t 2k

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)