You are working as a forensic physicist, analyzing a collision for the state police. According to witnesses, a car heading east and a truck heading south collided in an intersection. Photographs taken at the scene show that the car was severely damaged. Which of the following apply to this situation?

(A) |p|car, initial+|p|truck, initial=|p|car, final+|p|truck, final
(B) pcar, x, initial+pcar, x, final=ptruck, x, initial+ptruck, x, final
(C) pcar, y, initial+ptruck, y, initial=pcar, y, final+ptruck, y, final
(D) Ecar, initial+Etruck, initial=Ecar, final+Etruck, final
(E) pcar, x, initial+ptruck, x, initial=pcar, x, final+ptruck, x, final

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.

What is the relationship between the direction of motion of the balloon and the wind currents

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2