topic 1 until 4

Dimensional Analysis The speed 3: of an object is given by the equation 3: = At3 Br, where 1: refers to time. (a) What are the dimensions of A and B? (b) What are the SI units for the constants A and B? Conversion of Units One hectare is defined as 1.000 x 10" m2. One acre is 4.3563 x 104 ft2. How many acres are in one hectare? Vector A spider is resting on its web at point A as shown in Figure 1. An insect flies by and gets trapped at point C. The spider then quickly crawls to its prey. Using the unit vector notation along the x and y axes. calculate the spider's displacement to reach point c in the shortest time. Given distances 0A = OB = 06 =1ocm and 0 = 90C. 4 Figure 1