A football coach starts at the 10-yard line (A) and walks to the 40-yard line (B). He turns around and walks to the 0-yard line (C). He turns around again and walks back to the 50-yard line (D). He turns around once more and walks back to the 25-yard line (E), thus completing his
10 minutes of pacing.
West
East
A
B
GA
D+
-10
0
30
20
30
40
50
Position (yds)
The coach's average speed is
a. 1.5 y/min, East b. 1.5 y/min, West c. 1.5 y/min
6.0 y/min, West i. 6.0 y/min j. 8.5 y/min, East
West o. 14.5 y/min
p. none of these
d. 5.0 ylmin, East
k. 8.5 y/min, West
e. 5.0 y/min, West
1. 8.5 y/min
f. 5.0 y/min
g. 6.0 y/min, East h.
m. 14.5 y/min, East n. 14.5 yd/min,

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.

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

The starship enterprise is caught in a time warp and spock is forced to use the primitive techniques of the 20th century to determine the specific heat capacity of an unknown mineral. the 125-g sample was heated to 96.3°c and placed into a calorimeter containing 85.9 g of water at 20.0°c. the heat capacity of the calorimeter was 14.2 j/k. the final temperature in the calorimeter was 24.5°c. what is the specific heat capacity (in j/g°c) of the mineral? enter to 4 decimal places.