How many values of the magnetic quantum number, m?, are possible if the orbital angular momentum quantum number is ? = 2?
A) 1
B) 2
C) 3
D) 4
E) 5
E
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Light waves are
A) beams of moving electrons and other charged particles. B) beams of moving atoms. C) traveling disturbances in an electromagnetic field. D) traveling disturbances in the ether. E) traveling disturbances in the air.
A uniform rod is 3.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 27° above the horizontal. What is the angular speed of the rod as it passes through the horizontal position?
a. 3.0 rad/s b. 2.8 rad/s c. 2.1 rad/s d. 2.5 rad/s e. 3.4 rad/s
If two waves pass through the same region of space, they continue to move independently of one another
Indicate whether the statement is true or false
In the inspection of a sample of meat intended for human consumption, it was found that certain undesirable organisms were present. To make the meat safe for consumption, it is ordered that the meat be kept at a temperature of at least 121°C for a period of at least 20 min during the preparation. Assume that a 2.5-cm.-thick slab of this meat is originally at a uniform temperature of 27°C, that it is to be heated from both sides in a constant temperature oven; and that the maximum temperature meat can withstand is 154°C. Assume furthermore that the surface coefficient of heat transfer remains constant and is 10 W/(m2 K). The following data can be assumed for the sample of meat: specific heat = 4184 J/(kg K); density = 1280 kg/m3; thermal conductivity = 0.48 W/(m K). Calculate the oven
temperature and the minimum total time of heating required to fulfill the safety regulation.
GIVEN
• A slab of meat is heated in constant temperature over
• Meat be kept at a temperature of at least 121°C for a period of at least 20 min during the preparation
• Slab thickness (2L) = 2.5 cm = 0.025 m
• Initial uniform temperature (To) = 27°C
• The maximum temperature meat can withstand is 154°C
• Specific heat (c) = 4184 J/(kg K)
• Density (?) = 1280 kg/m3
• Thermal conductivity (k) = 0.48 W/(m K)
FIND
• The minimum total time of heating required to fulfill the safety regulation
ASSUMPTIONS
• The surface heat transfer coefficient ( h c)= 10 W/(m K)
• Edge effects are negligible
• One dimensional conduction
SKETCH
