If three arrival times are available at three different seismic stations then used to find the location of the focus or epicenter of the earthquake

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Which is an example of an exothermic process?

Ahypothetical metal has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.413 nm, 0.665 nm, and 0.876 nm, respectively. (a) if there are 8 atoms per unit cell and the atomic packing factor is 0.536, determine the atomic radius (in nm). (b) if the density is 3.99 g/cm3, calculate the metal's atomic weight (in g/mol).