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3506

Water is unsuitable for use as a thermometric liquid because it

A. expands unevenly between 0^oC and 40^oC
B. has narrow temperature range
C. has a concave meniscus
D. maintains a fixed density

View Answer & Discuss (3) WAEC 2015

3507

The diagram above illustrates a block ans 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

View Answer & Discuss WAEC 2015

3508

A quantity of hot water at 100^oC is added to 400g of water at 10^oC until the temperature of the mixture is 60^oC.

Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg^-1 K^-1]