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A minibus of mass 2000kg traveling at a constant velocity of 36km/h collides with a stationary
car of mass 1000kg. The impact takes 2 seconds before...
(Solved)
A minibus of mass 2000kg traveling at a constant velocity of 36km/h collides with a stationary
car of mass 1000kg. The impact takes 2 seconds before the two move together at a constant
velocity for 20 seconds. Calculate:
(i) The common velocity
(ii) The distance moved after impact
(iii) The impulse force
(iv) The change in kinetic energy
Date posted:
April 4, 2019
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Answers (1)
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A hydraulic machine is used to raise a load of 100kg at a constant velocity through a height
of 2.5m. The radius of the effort piston...
(Solved)
A hydraulic machine is used to raise a load of 100kg at a constant velocity through a height
of 2.5m. The radius of the effort piston is 1.4cm while that of the load piston is 7.0cm. Given
that the machine is 80% efficient, calculate:-
(i) The effort needed
(ii) The energy wasted in using the machine
Date posted:
April 4, 2019
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Answers (1)
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Name one machine that has a velocity ratio of less than one (V.R < 1)
(Solved)
Name one machine that has a velocity ratio of less than one (V.R < 1)
Date posted:
April 4, 2019
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Answers (1)
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An inclined plane of length 5m is used to raise a body of mass 60kg to the back of a lorry. If the
plane is inclined...
(Solved)
An inclined plane of length 5m is used to raise a body of mass 60kg to the back of a lorry. If the
plane is inclined at an angle 25° from the horizontal, calculate the efficiency of the system given
that a constant force of 650 N is used to push the body up the plane
Date posted:
April 4, 2019
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Answers (1)
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A ball of mass 100g is kicked horizontally from the top of a cliff. If the ball takes 4 seconds
to hit the ground, determine the...
(Solved)
A ball of mass 100g is kicked horizontally from the top of a cliff. If the ball takes 4 seconds
to hit the ground, determine the height of the cliff
Date posted:
April 4, 2019
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Answers (1)
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A faulty thermometer records 11oC instead of 0oC and 98oC instead of 100oC. Determine the reading on the thermometer when dipped in liquid at a temperature...
(Solved)
A faulty thermometer records 11oC instead of 0oC and 98oC instead of 100oC. Determine the reading on the thermometer when dipped in liquid at a temperature of 56oC
Date posted:
April 4, 2019
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Answers (1)
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The velocity-time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of the moon....
(Solved)
The velocity-time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of the moon. The weight of the object on earth’s surface is 20N, when the acceleration due to gravity is 10ms-2.
(i) State why the velocity becomes negative after 3seconds.
(ii) Determine the acceleration of free fall on the moon showing clearly your work
(iii) Determine the total distance travelled by the ball in 5.0sec
(iv) Find the weight of the ball on the moon
Date posted:
April 4, 2019
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Answers (1)
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Figure below shows a car with a dummy driver before and after a collision test:
(Solved)
Figure below shows a car with a dummy driver before and after a collision test:
The mass of the dummy driver is 90kg. The impact time to reduce the dummy’s speed from
45m/s to zero is 1.2 seconds:
(i) Calculate the average force on the dummy during impact
(ii) State the main energy transformation during the collision
(iii) Calculate how much of the dummy’s energy is transformed during the collision
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a uniform bar of length 1.0m pivoted near one end. The bar is kept in equilibrium by a spring balance as...
(Solved)
The figure below shows a uniform bar of length 1.0m pivoted near one end. The bar is kept in equilibrium by a spring balance as shown:
Given that the reading of the spring balance is 0.6N, determine the reaction force at the pivot.
Date posted:
April 4, 2019
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Answers (1)
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The figure below shows a section of a ticker tape. The dots were made at a frequency of 50 Hz.
Determine the acceleration of the trolley...
(Solved)
The figure below shows a section of a ticker tape. The dots were made at a frequency of 50 Hz.
Determine the acceleration of the trolley pulling the tape.
Date posted:
April 4, 2019
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Answers (1)
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When a load of 20N is hung from a spring, the spring has a length of 15 cm. The same spring
has a length of 17...
(Solved)
When a load of 20N is hung from a spring, the spring has a length of 15 cm. The same spring
has a length of 17 cm when supporting a load of 25N. Determine the spring length when
supporting no load.
Date posted:
April 4, 2019
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Answers (1)
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A single light spring extends by 3.6cm when supporting a load of 2.5kg. What is the total
extension in the arrangement shown below. (Assume the springs...
(Solved)
A single light spring extends by 3.6cm when supporting a load of 2.5kg. What is the total
extension in the arrangement shown below. (Assume the springs are identical)
Date posted:
April 4, 2019
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Answers (1)
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Sketch a graph of length of a helical spring against compressing force until the coils of the
spring are in contact
(Solved)
Sketch a graph of length of a helical spring against compressing force until the coils of the
spring are in contact
Date posted:
April 4, 2019
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Answers (1)
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The following results were recorded in an experiment where different masses were hung on the end of a long spring whose other end was firmly...
(Solved)
The following results were recorded in an experiment where different masses were hung on the end of a long spring whose other end was firmly fixed. The length of the spring and the mass hanging from it were recorded as below. Original length of spring was 40cm.
(a) Complete the table for load and corresponding extensions
(b) Plot a graph of extension of the spring against load on the spring on the grid provided
(c) Determine the spring constant using the linear section of the graph
(d) Give an explanation why the slope of the graph changes when a mass greater than 0.75kg is attached to the spring
(e) From the list of quantities below, select quantities that are vector quantities:-
speed, density, force, acceleration and current
Date posted:
April 4, 2019
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Answers (1)
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In the diagram in figure, water flows through a section of a pipe whose diameter changes as shown
(Solved)
In the diagram in figure, water flows through a section of a pipe whose diameter changes as shown
Sketch a graph of the variation of pressure along the line ABCD.
Date posted:
April 4, 2019
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Answers (1)
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The diagram below shows a section of a pipe with different cross – sectional area.
(Solved)
The diagram below shows a section of a pipe with different cross – sectional area.
If water flows with a velocity of 5m/s in section P, what would be the velocity of water in section Q if the cross sectional areas are as shown?
Date posted:
April 4, 2019
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Answers (1)
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A uniform metre rule is balanced at its centre. It is balanced by the 30N, 5N and the magnetic
force between P and Q. P is...
(Solved)
A uniform metre rule is balanced at its centre. It is balanced by the 30N, 5N and the magnetic
force between P and Q. P is fixed and Q has a weight of 5N
Ignoring the weight of the metre rule, calculate the value of the magnetic force between Q and P
Date posted:
April 3, 2019
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Answers (1)
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A uniform half metre long beam, pivoted at the 10cm mark, balances when a mass of 150g is suspended at the 0cm mark as shown...
(Solved)
A uniform half metre long beam, pivoted at the 10cm mark, balances when a mass of 150g is suspended at the 0cm mark as shown below:
Calculate the weight of the beam
Date posted:
April 3, 2019
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Answers (1)
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Figure below shows a uniform rod AE which is 40cm long. It has a mass of 2kg and pivoted at D. If 2N is acting...
(Solved)
Figure below shows a uniform rod AE which is 40cm long. It has a mass of 2kg and pivoted at D. If 2N is acting at point E, and 30N force is passed through a frictionless pulley.
Find the force (x) acting at end A.
Date posted:
April 3, 2019
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Answers (1)
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Figure shows a uniform wooden plank which weighs 10N. The plank is balanced at 0.8m from one end by a mass of 2.5kg.
(Solved)
Figure shows a uniform wooden plank which weighs 10N. The plank is balanced at 0.8m from one end by a mass of 2.5kg.
What is the length of the wooden plank in metres?
Date posted:
April 3, 2019
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Answers (1)