The position–time graph given describes the motion of an object. During which of the intervals (I to IV) is the object undergoing acceleration? A. I only B. II only C. I and III only D. II and IV only

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

v=ir = 3x15 =45 v

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.