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Water has an unusual expansion. Air space is left to prove room for expansion when the temperature falls below 4°C.
joseph rimiru answered the question on October 12, 2017 at 16:30
- A rectangular brick of weight 10 N, measures 50 cm × 30 cm × 10 cm. calculate the values of the maximum and minimum pressures...(Solved)
A rectangular brick of weight 10 N, measures 50 cm × 30 cm × 10 cm. calculate the
values of the maximum and minimum pressures which the block exert when resting on a horizontal plane
Date posted: October 12, 2017. Answers (1)
- State two differences between mass and weight.(Solved)
State two differences between mass and weight.
Date posted: October 12, 2017. Answers (1)
- State and explain two factors affecting the surface tension(Solved)
State and explain two factors affecting the surface tension.
Date posted: October 12, 2017. Answers (1)
- 100 cm^3 of fresh water of density 1,000 kgm^-3 is mixed with 100 cm^3 of sea water of density 1030 kgm^-3. Calculate the density of...(Solved)
100 cm^3 of fresh water of density 1,000 kgm^-3 is mixed with 100 cm^3 of sea water of density 1030 kgm^-3. Calculate the density of the mixture.
Date posted: October 12, 2017. Answers (1)
- Define the term relative density as used in quantity measurement.(Solved)
Define the term relative density as used in quantity measurement.
Date posted: October 12, 2017. Answers (1)
- The mass of an empty density bottle is 20 g. Its mass when filled with water is 40.0 g and 50.0 g when filled with...(Solved)
The mass of an empty density bottle is 20 g. Its mass when filled with water is 40.0 g and 50.0 g when filled with liquid X. Calculate the density of liquid X if the density of water is 1,000 kgm^-3
Date posted: October 12, 2017. Answers (1)
- A block of mass 187.5 gis 5 cm long, 2.0cm thick, and 7.5 cm high.Calculate the density in s.i units(Solved)
A block of mass 187.5 gis 5 cm long, 2.0cm thick, and 7.5 cm high.Calculate the density in s.i units.
Date posted: October 12, 2017. Answers (1)
- 1. Which is greater
a. 3:2 or 5:4
b. 3:4 or 5:7
(Solved)
1. Which is greater
a. 3:2 or 5:4
b. 3:4 or 5:7
Date posted: October 12, 2017. Answers (1)
- The price of a piece of land was adjusted in the ratio 7:3. If the original price was sh.210000. What is the new price?(Solved)
1The price of a piece of land was adjusted in the ratio 7:3. If the original price was sh.210000. What is the new price?
Date posted: October 11, 2017. Answers (1)
- What is the rate of consumption per day if twenty bays of beans are consumed in 100 days?(Solved)
What is the rate of consumption per day if twenty bays of beans are consumed in 100 days?
Date posted: October 11, 2017. Answers (1)
- A pressure cooker is preferred for cooking at high altitude. Explain why.(Solved)
A pressure cooker is preferred for cooking at high altitude. Explain why.
Date posted: October 11, 2017. Answers (1)
- State one factor that affect the melting point of ice other than pressure.(Solved)
State one factor that affect the melting point of ice other than pressure.
Date posted: October 11, 2017. Answers (1)
- A student found that a drop of methylated spirit on the back of the hand felt colder than a drop of water at...(Solved)
A student found that a drop of methylated spirit on the back of the hand felt colder than a drop of water at the same temperature. Explain.
Date posted: October 11, 2017. Answers (1)
- A heater rated 3.5 kw is used to raise the temperature of 5 kg of water through 70° C. Calculate the time required. (specific heat...(Solved)
A heater rated 3.5 kw is used to raise the temperature of 5 kg of water through 70⁰ C. Calculate the time required. (specific heat capacity of water is 4200 J/kg K). Give your answer in minutes.
Date posted: October 11, 2017. Answers (1)
- An immersion heater rated 900 w is placed in a liquid of mass 4 kg. It was switched on for 20 minutes and the temperature...(Solved)
An immersion heater rated 900 w is placed in a liquid of mass 4 kg. It was switched on for 20 minutes and the temperature of the liquid raised from 25°C to 35°C. Determine the specific heat capacity of the liquid
Date posted: October 11, 2017. Answers (1)
- A alloy of copper mass 4 kg and specific heat capacity 400 J/kg K initially at 91° is immersed in water at 20° C. if...(Solved)
A alloy of copper mass 4 kg and specific heat capacity 400 J/kg K initially at 91⁰ is immersed in water at 20⁰ C. if the final temperature is 21⁰C, determine the mass of water.(the specific heat capacity of water is 4200 J/kg K). give your answer to one decimal place.
Date posted: October 11, 2017. Answers (1)
- Some water of mass 4 kg, at a temperature of 100° is allowed to cool for 20 minutes. State the factors that determine its final...(Solved)
Some water of mass 4 kg, at a temperature of 100⁰ is allowed to cool for 20 minutes. State the factors that determine its final temperature.
Date posted: October 11, 2017. Answers (1)
- An electric kettle rated 2000 W takes 20 minutes to heat 30 kg of a liquid from 30° C to 45°C. (Solved)
An electric kettle rated 2000 W takes 20 minutes to heat 30 kg of a liquid from 30⁰ C to 45⁰C.
Date posted: October 11, 2017. Answers (1)
- Ice change to water at 0° C. 5 kg of ice and 5 kg of water at 0° were heated separately. Give a reason why...(Solved)
Ice change to water at 0⁰ C. 5 kg of ice and 5 kg of water at 0⁰ were heated separately. Give a reason why more heat energy is required to heat ice.
Date posted: October 11, 2017. Answers (1)
- A boy took 10 kg of water and raised its temperature to 90° C. He add m2 kg of water at 20° C and...(Solved)
A boy took 10 kg of water and raised its temperature to 90⁰ C. He add m2 kg of water at 20⁰ C and the mixture attained a temperature of 50⁰ C. Determine the value of m2. (Assume the containers did not get heated. Specific heat capacity of water = 4200Jkg^-1k^-1)
Date posted: October 11, 2017. Answers (1)