-
The figure below shows a rectangular block of wood with a hollow section at the position shown. The block is resting on a...
(Solved)
The figure below shows a rectangular block of wood with a hollow section at the position shown. The block is resting on a horizontal bench.
State and explain the effects on stability of the block when the hollow section is filled with water.
Date posted:
September 27, 2019
.
Answers (1)
-
The figure below shows two identical balloons A and B the balloons were filled with equal amounts of same type of gas. The balloons are...
(Solved)
The figure below shows two identical balloons A and B the balloons were filled with equal amounts of same type of gas. The balloons are suspected at distance X1 and X2 from a metal cube filled with boiling water and placed on an insulating material.
a. State the mode by which heat travels from the cubes to the balloons.
b. The face of the cube towards A is bright and shiny and face towards B is dull black. State with reasons the adjustments that should be made on the distances XI and X2 so that the rate of change of temperature in both balloons remains the same
Date posted:
September 27, 2019
.
Answers (1)
-
A nail is electrically magnetized, it attracts an increasing number of pins as the magnetizing current increase. After some time it can no longer attract...
(Solved)
A nail is electrically magnetized, it attracts an increasing number of pins as the magnetizing current increase. After some time it can no longer attract any more pins. Explain this observation domain theory.
Date posted:
September 27, 2019
.
Answers (1)
-
A dry cell is not recharged once used up. However when used well, it can serve one for some time. State the precautions necessary when...
(Solved)
A dry cell is not recharged once used up. However when used well, it can serve one for some time. State the precautions necessary when using it other than storing it in dry condition.
Date posted:
September 27, 2019
.
Answers (1)
-
The figure below shows a pulley system for lifting heavy objects.
(Solved)
The figure below shows a pulley system for lifting heavy objects.
(i) State the velocity ratio of the pulley system.
(ii) If the efficiency of the machine is 75%, calculate the mechanical advantage of the system.
(iii) Determine the effort applied
Date posted:
September 27, 2019
.
Answers (1)
-
A block measuring 20cm by 10cm by 4 cm rests on a flat surface. The block has a weight of 6.0N. Determine:
(Solved)
A block measuring 20cm by 10cm by 4 cm rests on a flat surface. The block has a weight of 6.0N. Determine:
(a) The minimum pressure it exerts on the surface.
(b) The density of the block in kg/m3. Take (g = 1N/kg)
Date posted:
September 26, 2019
.
Answers (1)
-
A solid displaces 5.0cm3 of paraffin when floating and 20cm3 when fully immersed in it. Given that the density of paraffin is 0.8g/cm3 ....
(Solved)
A solid displaces 5.0cm3 of paraffin when floating and 20cm3 when fully immersed in it. Given that the density of paraffin is 0.8g/cm3 . Calculate the density of the solid
Date posted:
September 26, 2019
.
Answers (1)
-
A jet of water emerges from a hose pipe of cross-sectional area 5.0 x 10-3m2 with a velocity of 3.0m/s. The water strikes a wall...
(Solved)
A jet of water emerges from a hose pipe of cross-sectional area 5.0 x 10-3m2 with a velocity of 3.0m/s. The water strikes a wall at a right angle and comes to rest without rebounding. Determine the mass of water striking the wall per second (Density of water is 1000 kgm-3)
Date posted:
September 26, 2019
.
Answers (1)
-
The diagram below shows two horizontal pipes, A and B. Tube A contains liquid at rest while tube B contains liquid in motion.
(Solved)
The diagram below shows two horizontal pipes, A and B. Tube A contains liquid at rest while tube B contains liquid in motion
Sketch graphs for (a) and (b) to show variation in pressure
Date posted:
September 26, 2019
.
Answers (1)
-
In using the lift pump to raise water from a bore hole. It is observed that practically the height the water is raised cannot be...
(Solved)
In using the lift pump to raise water from a bore hole. It is observed that practically the height the water is raised cannot be 10m and more. Give two reasons for this observation.
Date posted:
September 26, 2019
.
Answers (1)
-
The load carried by a truck loader was measured to be 65,000 grams. Convert the mass of the load into milligrams and express the answer...
(Solved)
The load carried by a truck loader was measured to be 65,000 grams. Convert the mass of the load into milligrams and express the answer in standard form.
Date posted:
September 26, 2019
.
Answers (1)
-
With an aid of a labeled diagram, describe an experiment to verify Charles’ law.
(Solved)
With an aid of a labeled diagram, describe an experiment to verify Charles’ law.
Date posted:
September 26, 2019
.
Answers (1)
-
In an experiment to determine the specific latent heat of vaporization of water, steam at 100ºC was passed into water contained in a well-lagged copper...
(Solved)
In an experiment to determine the specific latent heat of vaporization of water, steam at 100ºC was passed into water contained in a well-lagged copper calorimeter. The following measurements were made:
- Mass of calorimeter = 55g
- Initial mass of water = 75g
- Final mass of calorimeter + water + condensed steam = 133g
- Final temperature of the mixture = 30ºC
[Specific heat capacity of water = 4200JKgˉ¹kˉ¹ and specific heat capacity of copper= 390JKgˉ¹kˉ¹]
(i) mass of condensed steam.
heat gained by the calorimeter and water if the initial temperature of the
calorimeter + water = 20ºC.
(ii) given that L is the specific latent heat of vaporization of steam,
(I) Write an expression for the heat given out by steam.
(II) Determine the value of L.
Date posted:
September 26, 2019
.
Answers (1)
-
The figure below shows an inclined plane, a trolley of mass 30kg is pulled up a slope by a force of 100N, parallel to the...
(Solved)
The figure below shows an inclined plane, a trolley of mass 30kg is pulled up a slope by a force of 100N, parallel to the slope. The trolley moves so that the centre of mass C travels from points A to B.
(i) What is the work done on the trolley against the gravitational force in moving from A to B.?
(ii) Determine the work done by the force in moving the trolley from A to B.
(iii) Determine the efficiency of the system.
(iv) Determine the work done in overcoming the frictional force.
(v) Determine the mechanical advantage of the system.
Date posted:
September 26, 2019
.
Answers (1)
-
In an experiment to determine the density of a liquid, the following readings were made.
Mass of empty density bottle = 20g
Mass of bottle filled with...
(Solved)
In an experiment to determine the density of a liquid, the following readings were made.
Mass of empty density bottle = 20g
Mass of bottle filled with water = 70g
Mass of bottle filled with a liquid = 695g
a. Find the density of the liquid, given that density of water is 1000kgmˉ³.
b. Find the mass of the liquid.
Date posted:
September 26, 2019
.
Answers (1)
-
Sketch a graph of displacement against time for a transverse wave of frequency of 50Hz of at least two cycles with amplitude 2cm.
(Solved)
Sketch a graph of displacement against time for a transverse wave of frequency of 50Hz of at least two cycles with amplitude 2cm.
Date posted:
September 26, 2019
.
Answers (1)
-
The diagram below shows a metal tube made of iron and copper. The joint is tight at room temperature.
(Solved)
The diagram below shows a metal tube made of iron and copper. The joint is tight at room temperature.
Explain how you would separate the two by changing the temperature given that copper expands more than iron for some change in temperature.
Date posted:
September 26, 2019
.
Answers (1)
-
A student used the measuring instrument shown below to measure the thickness of a cylindrical wire, If the wire is 10cm long, find the volume...
(Solved)
A student used the measuring instrument shown below to measure the thickness of a cylindrical wire, If the wire is 10cm long, find the volume of the wire.
Date posted:
September 26, 2019
.
Answers (1)
-
A lorry weighing 6400kg is lifted with a jack screw of 11mm pitch. If the handle is 28cm from the screw
(Solved)
A lorry weighing 6400kg is lifted with a jack screw of 11mm pitch. If the handle is 28cm from the screw
(i) Find the velocity ratio
(ii) Neglecting the frictional force, Calculate mechanical advantage, MA)
(iii) Determine the force applied
Date posted:
September 26, 2019
.
Answers (1)
-
Sometimes work is not done even if there is an applied force. Give a reason
(Solved)
Sometimes work is not done even if there is an applied force. Give a reason
Date posted:
September 26, 2019
.
Answers (1)