- Sketch a block and tackle pulley with three movable pulleys in the lower block and two fixed pulleys in the upper block,to give a velocity...(Solved)
Sketch a block and tackle pulley with three movable pulleys in the lower block and two fixed pulleys in the upper block,to give a velocity ratio of 6.
Find:
(i) An effort of 450N is used to raise a load of 2700N. Determine:
- Mechanical advantage (M.A)
- Efficiency of the pulley system.
(ii) If all the wasted energy is used to raise the lower block and the frictional force between pulleys and moving parts is 3.6N; determine the weight of the lower block.
(iii) If the load moved through a distance of 50cm, determine the useful work done by the effort.
Date posted: September 9, 2019. Answers (1)
- The figure below shows a cuboid in two positions. Explain how the stability of the cuboid changes when it is changed from position a to...(Solved)
The figure below shows a cuboid in two positions. Explain how the stability of the cuboid changes when it is changed from position a to b.
Date posted: September 9, 2019. Answers (1)
- The spiral springs shown in the figure below are identical. Each spring has a spring constant K = 200 N/m. Each rod weighs 0.1 N...(Solved)
The spiral springs shown in the figure below are identical. Each spring has a spring constant K = 200 N/m. Each rod weighs 0.1 N and each spring weigh 0.1 N. Determine the total extension caused by the 150 N weight.
Date posted: September 9, 2019. Answers (1)
- A balloon with argon gas of volume 199cm3 at the earth‘s surface where the temperature is 210C, and the pressure 760mm of mercury. If it...(Solved)
A balloon with argon gas of volume 199cm3 at the earth‘s surface where the temperature is 210C, and the pressure 760mm of mercury. If it is allowed to ascend to a height where the temperature is 20C and the pressure 100mm of mercury, calculate the volume of the balloon.
Date posted: September 9, 2019. Answers (1)
- In a faulty mercury-in-glass thermometer it was found that the mercury level stands at 2 cm mark in the tube at 00C and 20cm when...(Solved)
In a faulty mercury-in-glass thermometer it was found that the mercury level stands at 2 cm mark in the tube at 00C and 20cm when in steam above boiling point of water at normal atmospheric pressure. Calculate the temperature when the mercury stands at 13cm mark.
Date posted: September 9, 2019. Answers (1)
- A man whose mass is 80kg stands on weighing machine. When the lift ascends with an acceleration of 2.45m/s2, what is the reading on the...(Solved)
A man whose mass is 80kg stands on weighing machine. When the lift ascends with an acceleration of 2.45m/s2, what is the reading on the scale?
Date posted: September 9, 2019. Answers (1)
- A micrometer screw gauge which had an error of +0.02mm was used to measure the diameter of a spherical marble. If the actual diameter was...(Solved)
A micrometer screw gauge which had an error of +0.02mm was used to measure the diameter of a spherical marble. If the actual diameter was 3.67mm, draw a micrometer screw gauge showing its reading.
Date posted: September 9, 2019. Answers (1)
- State the name of the instrument used to take the following readings;
(i) 10 kg
(ii) 0.00245m(Solved)
State the name of the instrument used to take the following readings;
(i) 10 kg
(ii) 0.00245m
Date posted: September 9, 2019. Answers (1)
- The figure below shows a pair of parallel plates of capacitors connected to a battery. The upper plate is displaced slightly to the left.(Solved)
The figure below shows a pair of parallel plates of capacitors connected to a battery. The upper plate is displaced slightly to the left.
Suggest two adjustments that can be made so as to reduce the effective capacitance.
Date posted: September 9, 2019. Answers (1)
- Four capacitors were connected in a circuit as shown in the figure below. The switch is then closed.(Solved)
Four capacitors were connected in a circuit as shown in the figure below. The switch is then closed.
Determine ;
(i) The effective capacitance
(ii) The total charge
(iii) The energy stored in the combination when the switch is closed.
Date posted: September 9, 2019. Answers (1)
- In an experiment to determine the focal length of a converging lens several values of image distance and the corresponding magnification were obtained. A graph...(Solved)
In an experiment to determine the focal length of a converging lens several values of image distance and the corresponding magnification were obtained. A graph of magnification m against image distance (V) was plotted as shown below.
From the graph determine the focal length of the converging lens.
Date posted: September 9, 2019. Answers (1)
- The figure below represents a pinhole camera.Sketch rays to show the formation of an enlarged image in the camera. Label both the image and the...(Solved)
The figure below represents a pinhole camera.Sketch rays to show the formation of an enlarged image in the camera. Label both the image and the object.
Date posted: September 9, 2019. Answers (1)
- The figure below shows a bar magnet. Point A and B are in front of the magnet.On the axis provided, sketch a graph showing how...(Solved)
The figure below shows a bar magnet. Point A and B are in front of the magnet.
On the axis provided, sketch a graph showing how the magnetic field strength changes from A to B.
Date posted: September 9, 2019. Answers (1)
- A pendulum bob is whirled with uniform speed in a horizontal circle of radius 20cm.The bob describes an arc of length 5cm within 15 seconds.Calculate
i)...(Solved)
A pendulum bob is whirled with uniform speed in a horizontal circle of radius 20cm.The bob describes an arc of length 5cm within 15 seconds.Calculate
i) Angular velocity
ii) The uniform speed of the bob along the circular path
iii) The frequency with the bob moves along the circular path
iv) State why the bob is accelerating yet it moves with the uniform speed along its path
Date posted: September 9, 2019. Answers (1)
- The following set-up was used by a student to determine the relative density of a cork(Solved)
The following set-up was used by a student to determine the relative density of a cork
During the experiment, the following measurements were taken:-
- Weight of sinker in water = w1
- Weight of sinker in water and cork in air = w2
- Weight of sinker and cork in water = w3
(i) Write an expression for the up thrust on cork
(ii) Write an expression for the relative density of the cork
Date posted: September 9, 2019. Answers (1)
- The diagram below shows a wooden log 12m long, density 800kg/m3 and cross-sectional area 0.06m< sup>2floating upright in sea water of density 1.03g/cm3, such that...(Solved)
The diagram below shows a wooden log 12m long, density 800kg/m3 and cross-sectional area 0.06m< sup>2floating upright in sea water of density 1.03g/cm3, such that a third of it is covered by water.
(i) Determine the weight of the block
(ii) The up-thrust on the block
(iii) The minimum weight that can be placed on the block to just make it fully submerged
Date posted: September 9, 2019. Answers (1)
- Two spring Q and R have proportionality constants 20Nm-1 and 25Nm-1 respectively. Q weighs 0.2 N while the weight of R is negligible. The two...(Solved)
Two spring Q and R have proportionality constants 20Nm-1 and 25Nm-1 respectively. Q weighs 0.2 N while the weight of R is negligible. The two springs are arranged to support a load of 3.0N as shown in the diagram that follows.
Determine the extension in
i) Q
ii) R
Date posted: September 9, 2019. Answers (1)
- The graph shows how extension e of a helical spring varied with load, hanging on it. (cm).Determine from the graph, the proportionality constant of the...(Solved)
The graph shows how extension e of a helical spring varied with load, hanging on it. (cm).Determine from the graph, the proportionality constant of the spring.
Date posted: September 9, 2019. Answers (1)
- A body of mass 4.0 kg held at a vertical height of 500cm is released to travel along a frictionless curved path as shown in...(Solved)
A body of mass 4.0 kg held at a vertical height of 500cm is released to travel along a frictionless curved path as shown in the figure below.The 4.0kg mass strikes body of mass 6.0kg at rest immediately it reaches the horizontal. The bodies stick together and move in the same direction. Determine the velocity of the bodies immediately after collision.
Date posted: September 9, 2019. Answers (1)
- The figure below shows a simple pendulum of length 80 cm. the pendulum bob whose mass is 50 g oscillates between points A and B,...(Solved)
The figure below shows a simple pendulum of length 80 cm. the pendulum bob whose mass is 50 g oscillates between points A and B, through its rest position C. A and B are both 10 cm higher than C.
(a) State the form of energy possessed by the pendulum bob at point A
(b) Determine
(i) The velocity of the bob at point C
(ii) The tension in the string as the bob passes point C
(Take acceleration due to gravity g=10m/s2
Date posted: September 9, 2019. Answers (1)