Q1) The graph shows how the amount of radiation emitted by a sample of the radionuclide
uranium 238 (U238) changes as time passes.
Radiation
emitted
(counts per 40
minute)
Time (billions of years)
(a)
What is the half-life of uranium 238 (U238)?
(You should show how you obtained your answer. You may do this on the graph
if you wish.)

(8%) problem 12. a bowling ball of mass mb 3 kg 's rolled down the lane with a velocity ofy-2/ m s lt strikes a single remaining pin mp 0.93 kg head on. after the collision the bowling ball has a velocity (in the same direction) of v2 1.1 m/s. = ▲ 33% part (a) write an expression for the velocity of pin in the horizontal direction after the impact, im ,, 33% part (b) what is the pins speed in ms? 33% part (c) assuming the coefficient of friction s μ,-0.1. how far in meters could the pin slide before stopping if it doesn't topple?