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1. Expressing functions [word problems]

Could somebody help me understand the process of solving these problems because I don't even know where to start... Also, could someone provide a link to a site where I can practice more of these type of problems. 1) Homework Statement : A rectangular package to be sent by a postal service can...
2. Electricity and Magnetism homework

Homework Statement What is the Kinetic Energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT? m_{e} = 9.1 \times 10^{-31} \textup{kg} q_{e} = 1.6 \times 10^{-19} \textup{C} Homework Equations I got stuck doing...
3. Rotational dynamics

In a class demonstration, a bicycle wheel was held on an axle and spun. The result came to be that the wheel while rotating held a vertical position while holding it by a string attached to the end of the axle. After the wheel stopped rotating its vertical position ceased and the wheel attained...
4. Two equations for centripetal acceleration

My question is how can Ac (centripetal acceleration) be both inversely related to radius and directly related in two equations: 1) Ac = V2/r 2) Ac = 4pi2r/T2 In the first equation Ac is inversely proportional to radius in the second one Ac is directly proportional to radius. Why and how is...
5. Physics literature

I'm currently a student in high school taking AP Physics and I'm interested in a book that would contain problems and detailed solutions to each problem. Please give me some recommendations to what book(s) I should look into.