Get premium membership and access questions with answers, video lessons as well as revision papers.
Quantity of heat equation 20x (42-26)x C=10^3 x 15 x60
C=2.8x 103JKg -1K =
2812.5
OR 2813
Githiari answered the question on September 19, 2017 at 13:57
- Give one example of a semiconductor and one for a conductor
(Solved)
Give one example of a semiconductor and one for a conductor
Date posted: September 19, 2017. Answers (1)
- Distinguish between semiconductor and conductors(Solved)
Distinguish between semiconductor and conductors
Date posted: September 19, 2017. Answers (1)
- Which instrument which can be used to measure the thickness of the hair(Solved)
Which instrument which can be used to measure the thickness of the hair.
Date posted: September 19, 2017. Answers (1)
- State the accuracy of a vernier caliper.(Solved)
State the accuracy of a vernier caliper.
Date posted: September 19, 2017. Answers (1)
- State the difference between conductors and insulators(Solved)
State the difference between conductors and insulators
Date posted: September 19, 2017. Answers (1)
- Explain why boiling water is not used to sterilize clinical thermometer.(Solved)
Explain why boiling water is not used to sterilize clinical thermometer.
Date posted: September 19, 2017. Answers (1)
- State any two reasons why water is not a suitable thermometric fluid.(Solved)
State any two reasons why water is not a suitable thermometric fluid.
Date posted: September 19, 2017. Answers (1)
- State why concrete is usually reinforced with steel in the construction of beams(Solved)
State why concrete is usually reinforced with steel in the construction of beams.
Date posted: September 19, 2017. Answers (1)
- Explain why trees bends towards a busy highway.(Solved)
Explain why trees bends towards a busy highway.
Date posted: September 19, 2017. Answers (1)
- Differentiate between pressure and force(Solved)
Differentiate between pressure and force
Date posted: September 19, 2017. Answers (1)
- State any two special rays used in the construction of ray diagrams(Solved)
State any two special rays used in the construction of ray diagrams
Date posted: September 19, 2017. Answers (1)
- Electrons emitted from a metal when light of a certain frequency is shone on the metal are
found to have a maximum energy of 8.0 x...(Solved)
Electrons emitted from a metal when light of a certain frequency is shone on the metal are
found to have a maximum energy of 8.0 x 10-19J. If the work function of the metal is 3.2 x 10-19J,
determine the wavelength of the light used.
Date posted: September 19, 2017. Answers (1)
- A car can be brought to rest from a speed of 20 ms-1 in a time of 2s.
(i) Calculate the average deceleration
(ii) If the driver’s...(Solved)
A car can be brought to rest from a speed of 20 ms-1 in a time of 2s.
(i) Calculate the average deceleration
(ii) If the driver’s reaction time is 0.2s, determine the shortest stopping distance
Date posted: September 19, 2017. Answers (1)
- A drinking glass 0.02 kg contains 200gms of water at 20^0 C. A mass of 0.04 kg of ice at 0^0 C is
dropped into the...(Solved)
A drinking glass 0.02 kg contains 200gms of water at 20^0C. A mass of 0.04 kg of ice at 0^0 C is
dropped into the glass. Determine the final temperature of the mixture. Specific heat capacity of
glass = 670kg^-1K^-1. (Give your answer to correct one decimal place)
Date posted: September 19, 2017. Answers (1)
- State how eddy currents are reduced in a transformer(Solved)
How are eddy currents in the transformer minimized?
Date posted: September 19, 2017. Answers (1)
- State three factors that affect the speed of sound in the air(Solved)
State three factors that affect the speed of sound in the air
Date posted: September 19, 2017. Answers (1)
- Define the term wave(Solved)
Define the term wave
Date posted: September 19, 2017. Answers (1)
- The number of molecules in 18cm^3 of a liquid is 6 x 10^23. Assuming that the diameter of the
molecules is equivalent to the side of...(Solved)
The number of molecules in 18cm^3 of a liquid is 6 x 10^23. Assuming that the diameter of the
molecules is equivalent to the side of a cube having the same volume as the molecule. Determine
the diameter of the molecule.
Date posted: September 19, 2017. Answers (1)
- State factors affecting the spring constant of the spring(Solved)
State factors affecting the spring constant of the spring
Date posted: September 19, 2017. Answers (1)
- State factors that determine the force on a current carrying conductor on the magnetic field(Solved)
State factors that determine the force on a current carrying conductor on the magnetic field
Date posted: September 19, 2017. Answers (1)