The half-life of cadmium-109 is 450 days. A scientist measures out a 200 gram (g) sample. Approximately how many grams of cadmium-109 would remain after 1,350 days?
100 g
O 50 g
O 12.5 g
O 25 g

Distinguish between a transverse wave and a longitudinal wave.

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.