Determine the maximum theoretical speed that a 1225 kg automobile starting from rest can reach after traveling 400 m if air resistance is considered. assume that the coefficient of static friction between the tires and the pavement is 0.70, that the automobile has front- wheel drive, that the front wheels support 62 percent of the automobile's weight, and that the aerodynamic drag d has a magnitude d 0.825v, where dand vare expressed in newtons and m/s, respectively the maximum theoretical speed is km/h.

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.