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A footballer kicks a ball of 600g initially at rest using a force of 900N. If the foot was in
contact with the ball for 0.1sec....
(Solved)
A footballer kicks a ball of 600g initially at rest using a force of 900N. If the foot was in
contact with the ball for 0.1sec. What was the take off speed of the ball?
Date posted:
April 4, 2019
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Answers (1)
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State the law of inertia
(Solved)
State the law of inertia
Date posted:
April 4, 2019
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Answers (1)
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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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(i) complete the diagram below to show how the pulley can be used to raise a load L by
applying an effort E
(Solved)
(i) complete the diagram below to show how the pulley can be used to raise a load L by
applying an effort E
(ii) The pulley system above has a mechanical advantage of 3. Calculate the total work done
when a load of 60N is raised through a height of 9M
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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The figure below shows a pulley system being used to raise a load.
(Solved)
The figure below shows a pulley system being used to raise a load.
If a load of 100N is raised by applying an effort of 48N, determine the efficiency of
the system.
Date posted:
April 4, 2019
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Answers (1)
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Vicky performed an experiment using a pulley system as shown in the figure.
(Solved)
Vicky performed an experiment using a pulley system as shown in the figure.
(a) What is the V.R. of the system?
(b) Determine the M.A. of the system. *
(c) Calculate the efficiency of the system.
(d) Explain why efficiency of a practical machine is always less than 100%
(e) If the load moves a distance of 5 cm. Find the work done on the load.
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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Sketch a velocity-time graph for a body moving with zero acceleration
(Solved)
Sketch a velocity-time graph for a body moving with zero acceleration
Date posted:
April 4, 2019
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Answers (1)
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State the three equations of linear motion.
(Solved)
State the three equations of linear motion.
Date posted:
April 4, 2019
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Answers (1)
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A car is traveling uniformly at 100km/hr when the driver observes a road block ahead.
He takes 0.5 s before applying the brakes which brings the...
(Solved)
A car is traveling uniformly at 100km/hr when the driver observes a road block ahead.
He takes 0.5 s before applying the brakes which brings the car to rest with a uniform
deceleration of 4m/s2. Determine the distance traveled by the car from the time the driver
observed the road block until the car comes to rest.
Date posted:
April 4, 2019
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Answers (1)
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In an experiment on momentum, trolley P of mass 800g was attached to a ticker timer of
frequency 50Hz. Trolley P, initially moving with a velocity...
(Solved)
In an experiment on momentum, trolley P of mass 800g was attached to a ticker timer of
frequency 50Hz. Trolley P, initially moving with a velocity of 0.5m/s, was made to collide
with a stationary trolley Q of mass 400g. A copy of the tape as it appeared after the collision is
presented in the figure below:-
a) Determine the velocity of the trolley P after collision
(b) Calculate the impulsive force experienced by trolley P
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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The graph figure below shows displacement –time graph of a in motion
(Solved)
The graph figure below shows displacement –time graph of a in motion
(i) Determine the instanteous velocities at t = 1second and at t = 4 seconds
(ii) Use the results in (i) above to determine the acceleration of the body
Date posted:
April 4, 2019
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Answers (1)
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A parcel is to be dropped from an aeroplane traveling horizontally at 120m/s, at an altitude
of 720m, to fall into a certain village.
Determine
(Solved)
A parcel is to be dropped from an aeroplane traveling horizontally at 120m/s, at an altitude
of 720m, to fall into a certain village.
Determine:
i) The time taken for the parcel to reach the ground
ii) How far ahead of the plane, the village should be when the parcel is released
Date posted:
April 4, 2019
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Answers (1)
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Figure below is a velocity- time graph describing the motion of a particle
(Solved)
Figure below is a velocity- time graph describing the motion of a particle
What does the shaded area represent?
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 volume of a bubble at the base of a container of water is 3cm3. The depth of water is
30cm. The bubble rises up the...
(Solved)
The volume of a bubble at the base of a container of water is 3cm3. The depth of water is
30cm. The bubble rises up the column until the surface ;
(i) Explain what happens to the bubble as it rises up the water column
(ii) Determine the volume of the bubble at a point 5cm below the water surface
Date posted:
April 4, 2019
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Answers (1)
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If the trolley was allowed to move down the inclined plane for 4 seconds, calculate the distance
it covers
(Solved)
If the trolley was allowed to move down the inclined plane for 4 seconds, calculate the distance
it covers
Date posted:
April 4, 2019
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Answers (1)