According to Einstein's theory of special relativity
A) space and time are aspects of each other.
B) energy and mass are aspects of each other.
C) both of these
D) neither of these
Answer: C
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A thin-wall cylindrical vessel (1 m in diameter) is filled to a depth of 1.2 m with water at an initial temperature of 15°C. The water is well stirred by a mechanical agitator. Estimate the time required to heat the water to 50°C if the tank is suddenly immersed into oil at 105°C. The overall heat transfer coefficient between the oil and the water is 284 W/(m2 K), and the effective heat transfer surface area is 4.2 m2 .
GIVEN
• A thin wall cylindrical vessel filled with water is suddenly immersed into oil
• Diameter of vessel (D) = 1 m
• Depth of water is vessel = 1.2 m
• Initial temperature (To) = 15°C
• Final temperature (Tf) = 50°C
• Oil temperature (T?) = 105°C
• The overall heat transfer coefficient between the oil and water ( )h = 284 W/(m2 K)
• The effective heat transfer surface area (A) = 4.2 m2 FIND
• The time required to heat the water to 50°C
ASSUMPTIONS
• The thermal capacitance of the cylindrical vessel is negligible
• The temperature of the water is uniform
• The oil temperature remains constant
SKETCH
A woman is straining to lift a large crate, without success because it is too heavy
We denote the forces on the crate as follows: P is the upward force the woman exerts on the crate, C is the vertical contact force exerted on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related while the woman is trying unsuccessfully to lift the crate? A) P + C = W B) P + C < W C) P + C > W D) P = C
The lack of any obvious source for many outflow channels on Mars suggests that the water originated from
A) underground B) the atmosphere in the form of rain C) ancient melting glaciers D) the atmosphere in the form of snow
Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes?
A) A main-sequence star is cooler and dimmer than it was as a protostar. B) A main-sequence star is cooler and brighter than it was as a protostar. C) A main-sequence star is hotter and brighter than it was as a protostar. D) A main-sequence star is hotter and dimmer than it was as a protostar.