A horse runs for 15 seconds to the south at a speed of 12 m/s. What is the displacement of the horse in this time?
A. 180 m south
B. 150 m south
C. 150 m
D. 180 m

Rohit is trying to tune an instrument

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.