Aparticle travels on the x-axis so its velocity at time t is given by v(t)=1/2-cos(t) meters per second, where t is between 0 and 2pi, inclusive. a. for what values of t is the particle moving to the right? . b. if the particle starts at x=3, what is the final position of the article? . c. what is the total distance traveled by the particle? . d. when t=pi/4, is the speed of the particle increasing or decreasing?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?

Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 c. what is the vapor pressure of ethanol at 14 c?