Desmond builds a set of towers out of blocks. The table shows the number of blocks in each tower. Tower # 1 2 3 4 5 Number of blocks5 10 20 40 80 Which explicit formula correctly represents the number of blocks, an, in terms of the tower number, n? A. An =n+ 80 B. Ar = 2n +5 C. An = 5(2)7-1 D. An = 10(5)n

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little