Unit-7 Density and Temperature
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Unit-7 Density and Temperature
Answer: Divide kg/m^3 by 1000 to get g/cm^3, so 2700 kg/m^3 = 2.7 g/cm^3.
Answer: Because water is densest at 4 degrees C, this layer sinks below the colder, lighter water and protects fish.
Answer: Thermal equilibrium means no net heat flow, which happens when temperatures are equal.
Answer: Mass = density x volume = 1000 x 2 = 2000 kg.
Answer: Divide kg/m^3 by 1000 to get g/cm^3, so 1200 kg/m^3 = 1.2 g/cm^3.
Answer: The container also expands, so the rise of the liquid level is less than the real expansion of the liquid.
Answer: Temperature indicates how hot or cold a body is.
Answer: Rearranging density = mass/volume gives mass = density x volume.
Answer: The whole plate expands uniformly on heating, so the hole also becomes larger.
Answer: Denser objects sink because their weight exceeds the upthrust of water.
Answer: The SI unit of temperature is the kelvin (K).
Answer: K = C + 273 = 100 + 273 = 373 K.
Answer: New length = L0(1 + alpha x temperature change) = 1(1 + 1.1 x 10^-5 x 50) = 1.00055 m.
Answer: Normal human body temperature is about 37 degrees C, which is 98.6 degrees F.
Answer: Water boils at 100 degrees C, and K = 100 + 273 = 373 K.
Answer: K = 25 + 273 = 298 K.
Answer: Using V/T = constant with temperatures in kelvin: V2 = V x (327/300) = 1.09V.
Answer: Absolute zero is 0 K, equal to -273 degrees C, the lowest possible temperature.
Answer: C = K - 273 = 310 - 273 = 37 degrees C, the normal body temperature.
Answer: 100 degrees C, 212 degrees F and 373 K are all equal; 500 K equals about 227 degrees C, which is highest.