A 400-n block is dragged along a rough (k = 0. 4) horizontal surface by an applied force f as shown. The block moves at constant velocity. What is the magnitude of f?.

What is the electric force acting between two charges of -0.0045 c and -0.0025 c that are 0.0060 m apart? use fe=kq1q2/r^2 and k = 9.00 x 10^9 n*m^2/c^2 a. 1.7 x 10^7 n b. -1.7 x 10^7 n c. -2.8 x 10^9 n d. 2.8 x 10^9 n

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Write down two additional questions about earth's magnetic field that will make your presentation more informative.