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The cork on the dull surface falls off first. Black surfaces are good absorbers of heat.
maurice.mutuku answered the question on November 22, 2019 at 07:21
- The figure below shows a micrometer screw gauge holding a ball bearing. Use the figure to answer questions (i) and (ii)(Solved)
The figure below shows a micrometer screw gauge holding a ball bearing. Use the figure to answer questions (i) and (ii)
i) State the function of the part labeled B in measuring the dimension of the ball bearing
ii) Determine the radius of the ball bearing in S.I. units.
Date posted: November 22, 2019. Answers (1)
- Figure 1 shows a wire wound closely on a test tube. Given that L = 12 mm, determine the thickness of the wire.(Solved)
Figure 1 shows a wire wound closely on a test tube. Given that L = 12 mm, determine the thickness of the wire.
Date posted: November 22, 2019. Answers (1)
- A bullet of mass 20 g moving at 400 m/s strikes a block of wood of mass 3.5kg initially at rest. The bullet sticks into...(Solved)
A bullet of mass 20 g moving at 400 m/s strikes a block of wood of mass 3.5kg initially at rest. The bullet sticks into the block and the two move off together on a horizontal surface, where a frictional retarding force of 4N is acting between the block and surface.
(i) Determine the initial common velocity of bullet and wooden block.
(ii) What distance does the block move before coming to rest?
Date posted: November 13, 2019. Answers (1)
- The figure below shows a body of mass;??=200?? attached to the centre of a rotating table with a string. The radius of the string was...(Solved)
The figure below shows a body of mass;đť‘š=200đť‘” attached to the centre of a rotating table with a string. The radius of the string was varied and different values of angular velocity recorded. The mass of the body remained constant throughout the experiment
The results obtained for angular velocity and radius were used to plot the following graph;
From the above graph;
(i) Calculate the value of the slope
(iii)State the significance of P.
Date posted: November 13, 2019. Answers (1)
- An object weighs 1.04N in air, 0.64N when fully immersed in water and 0.72N when fully immersed in a liquid. If the density of water...(Solved)
An object weighs 1.04N in air, 0.64N when fully immersed in water and 0.72N when fully immersed in a liquid. If the density of water is 1000 kgm-3, find the density of the liquid.
Date posted: November 13, 2019. Answers (1)
- The figure below shows a Bunsen burner.(Solved)
The figure below shows a Bunsen burner.
Use the Bernoulli’s Principle to explain how air is drawn into the burner when the gas tap opened.
Date posted: November 13, 2019. Answers (1)
- A car is brought to rest from a speed of 30m/s in 2 seconds. If the driver’s reaction time is 0.3s, determine the shortest stopping...(Solved)
A car is brought to rest from a speed of 30m/s in 2 seconds. If the driver’s reaction time is 0.3s, determine the shortest stopping distance.
Date posted: November 13, 2019. Answers (1)
- The spiral springs shows in the figure below are identical. Each spring has a spring constant K = 300N/m .Each rod weighs 0.1N and each...(Solved)
The spiral springs shows in the figure below are identical. Each spring has a spring constant K = 300 N/m .Each rod weighs 0.1 N and each spring weighs 0.2 N.
(a) Determine the total extension caused by the 150 N weight.
(b) Apart from length of the spring and nature of material, state one other factor affecting the spring constant.
Date posted: November 13, 2019. Answers (1)
- The figure below shows a glass tumbler partly filled with water at room temperature.(Solved)
The figure below shows a glass tumbler partly filled with water at room temperature.
Briefly explain what happens to the stability of the tumbler when water is cooled to temperatures below 0 degrees C.
Date posted: November 13, 2019. Answers (1)
- The pattern below shows oil leakage on a path at the rate of 10 drops per second form a lorry(Solved)
The pattern below shows oil leakage on a path at the rate of 10 drops per second form a lorry
Calculate the acceleration of the lorry.
Date posted: November 13, 2019. Answers (1)
- The figure below shows a clinical thermometer.(Solved)
The figure below shows a clinical thermometer.
State the function of the constriction.
Date posted: November 13, 2019. Answers (1)
- n an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.12cm3 was placed on a clean...(Solved)
In an experiment to estimate the size of a molecule of olive oil, a drop of oil of volume 0.12cm3 was placed on a clean water surface. The oil spread on a patch of
diameter 6.0 x 106 mm2.
a) Calculate the size of the molecule.
b) State an assumption made in the above calculations.
Date posted: November 13, 2019. Answers (1)
- The diagram below shows the behaviour of mercury in a capillary tube.(Solved)
The diagram below shows the behaviour of mercury in a capillary tube.
Explain the behaviour.
Date posted: November 13, 2019. Answers (1)
- The figure below shows a vernier calipers scale.(Solved)
The figure below shows a vernier calipers scale.
State the correct reading of scale if the instrument has a zero-error of -0.02cm
Date posted: November 13, 2019. Answers (1)
- student obtained ice at 0 degrees C from a refrigerator and placed it in a beaker on a bench. After 4 minutes, the temperature rose...(Solved)
student obtained ice at 0 degrees Cfrom a refrigerator and placed it in a beaker on a bench. After 4 minutes, the temperature rose to 4 degrees C. State the changes that would be observed in the water in terms of;
(i) density
(ii) mass
(ii) volume
Date posted: November 7, 2019. Answers (1)
- A certain metal is illuminated with radiation of different frequencies and corresponding stopping potential determined. The graph in figure below shows how the stopping potential...(Solved)
A certain metal is illuminated with radiation of different frequencies and corresponding stopping potential determined. The graph in figure below shows how the stopping potential vary with frequency. Electronic charge, e =1.6x10-19C
Using the graph determine
i) Planks constant.
ii) Work function of the metal
Date posted: November 4, 2019. Answers (1)
- The minimum frequency of light that causes photoelectric emission from a metal surface is 6.4 x 1014Hz . When the surface is irradiated with a...(Solved)
The minimum frequency of light that causes photoelectric emission from a metal surface is 6.4 x 1014Hz . When the surface is irradiated with a certain source , electrons are dislodged With a speed of 7.2 x 105m/s.Given that h = 6.63 x 10-34Js and m = 9.11 x 10-31kg , calculate
i) The work function of the metal
ii) The maximum kinetic energy of the photoelectrons
Date posted: November 4, 2019. Answers (1)
- Draw the electric field pattern between the positive point charge and the negatively charged plate in figure below.(Solved)
Draw the electric field pattern between the positive point charge and the negatively charged plate in figure below.
Date posted: November 4, 2019. Answers (1)
- You are provided with three capacitors with capacitance 2µf, 5µf and 3µf .
i) Sketch a diagram showing how the three capacitors can be connected to...(Solved)
You are provided with three capacitors with capacitance 2µf, 5µf and 3µf .
i) Sketch a diagram showing how the three capacitors can be connected to produce
maximum capacitance.
ii) Determine the maximum capacitance.
iii) The arrangement in (i) above is connected in series with a 12V battery.
Calculate the work done in charging the capacitors.
Date posted: November 4, 2019. Answers (1)
- Draw labeled diagram of a simple a.c generator.(Solved)
Draw labeled diagram of a simple a.c generator.
Date posted: November 4, 2019. Answers (1)