Acharge of -3.35 nc is placed at the origin of an xy-coordinate system, and a charge of 1.75 nc is placed on the y axis at y = 3.90 cm . a. if a third charge, of 5.00 nc , is now placed at the point x = 2.70 cm , y = 3.90 cm find the x and y components of the total force exerted on this charge by the other two charges.
b. find the magnitude of this force.
c. find the direction of this force. ( ° below the +x axis )

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.

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?

What are the necessary conditions for fusion?