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| 1. |
An electron's position is given by vecr=3.00hati-4.00t^(2)hatj+2.00hatk, with t in seconds and vecr in meters. (a) In unit-vector notation, what is the electron's velocity vecr(t)? At t = 3.00 s, what is vecv (b) in unitvector notation and as ( c) a magnitude and (d) an angle relative to the positive direction of the x axis? |
| Answer» Solution :(a) `(3.00m//s)hati-(8.00tm//s)hatj,` (b) `(3.00hati-24.0hatj)m//s,` ( C) 24.2 m/s, (d) `82.9^(@)` measured CLOCKWISE from the +X direction, or `277^(@)` COUNTERCLOCKWISE from +x) | |