A 0.25 kg ideal harmonic oscillator has a total mechanical energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?
A) 4.5 Hz
B) 1.4 Hz
C) 2.3 Hz
D) 3.2 Hz
A
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When heating 2 kg of ice from –40°C, 2 kg of water from 20°C to 50°C, and 2 kg of steam from 100°C to 125°C, which requires the most energy?
a. the ice b. the water c. The steam, it's obvious since it is the hottest. d. All three take the same amount.
When a liquid copper-nickel alloy is rapidly cooled, the center of the grains has a higher concentration of nickel atoms than the average concentration. This is _____________.
Fill in the blank(s) with the appropriate word(s).
Explain what is meant by a net or unbalanced force
What will be an ideal response?
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
