A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]
A. 200g B. 320g C. 400g D. 500g Correct Answer: Option D D. 500g Explanation Heat lost by hot water = Heat gained by cold water M x 4200 x (100 – 60 = 0.4 x 4200 x (60 – 10) 4200m x 40 = 0.4 x 4200 x 50 40m = 0.4 x 50 m = 0.4×50/40 = 0.5kg =...The diagram above illustrates a block and tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E.
A. 22.2N B. 38.0N C. 67.0N D. 75.0N Correct Answer: Option A A. 22.2NWater is unsuitable for use as a thermometric liquid because of its?
A. expands unevenly between 0ºC and 40ºC B. has a narrow temperature range C. has a concave meniscus D. maintains fixed density Correct Answer: Option A A. expands unevenly between 0ºC and 40ºCThe crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of?
A. thermal equilibrium of the sheets B. conduction of heat by the sheets C. contraction of the sheets D. expansion of the sheets Correct Answer: Option D D. expansion of the sheetsProducts
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