Emeka carried out a reaction in which a gas was given off. He followed the progress of the reaction by measuring the mass of the reaction vessel over time. After 5 minutes the mass of the reaction vessel had decreased from 120g to 114.5g. Calculate the rate of this reaction.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

I’ve been stuck on this for a while