What can we say about the velocity of a car which has negative acceleration in the x-direction? multiplechoice : 1) the x-component of it's velocity is decreasing. 2) the x-component of its velocity is positive. 3) it is slowing down. 4) the x-component of its velocity is negative. 5) it is speeding up. 6) the x-component of it's velocity is increasing.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

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To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin. answer in one word. part bfind e(r), the magnitude of the electric field at distance r from the point charge q. express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q. express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r