Soft iron armature should be easily magnetized and demagnetized. It concentrates the matnetic field inside the core to increase the magnetic strength.
Kavungya answered the question on May 31, 2019 at 07:57
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A boy observes his face in a concave mirror of focal length 100cm. If the mirror is 80cm away, state one characteristic of the image...
(Solved)
A boy observes his face in a concave mirror of focal length 100cm. If the mirror is 80cm away, state one characteristic of the image observed.
Date posted:
May 31, 2019
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Answers (1)
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The figure below shows the image behind a mirror M.
By ray diagram construction, locate the position of the object.
(Solved)
The figure below shows the image behind a mirror M.
By ray diagram construction, locate the position of the object.
Date posted:
May 31, 2019
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Answers (1)
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Explain why a body moving in horizontal circular motion does no work.
(Solved)
Explain why a body moving in horizontal circular motion does no work.
Date posted:
May 31, 2019
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Answers (1)
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A pendulum bob is raised to a height of 60cm above its lowest point and made to swing as shown in the figure.
Determine the velocity...
(Solved)
A pendulum bob is raised to a height of 60cm above its lowest point and made to swing as shown in the figure.
Determine the velocity of the mass at the height where kinetic energy is equal to the potential energy.
Date posted:
May 31, 2019
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Answers (1)
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Figure below shows two rays of monochromatic light incident on two adjacent slits S1 and S2
State what is observed on the screen when the:
i) Distance...
(Solved)
Figure below shows two rays of monochromatic light incident on two adjacent slits S1 and S2
State what is observed on the screen when the:
i) Distance X is increased.
ii) Slit separation, d is reduced.
iii) White light is used.
Date posted:
May 31, 2019
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Answers (1)
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The wave shown in figure below has a velocity of 200m/s
Determine
i) The period T of the wave
ii) The frequency of the wave.
iii)...
(Solved)
The wave shown in figure below has a velocity of 200m/s
Determine
i) The period T of the wave
ii) The frequency of the wave.
iii) The wavelength of the wave.
Date posted:
May 31, 2019
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Answers (1)
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A 200g mass of copper was heated to 100°C and then transferred to a lagged copper calorimeter of mass 5g containing 125g of water at...
(Solved)
A 200g mass of copper was heated to 100°C and then transferred to a lagged copper calorimeter of mass 5g containing 125g of water at 30°C. Calculate the final temperature of water. (Specific heat capacity of copper = 400J/KgK, water =4200J/KgK).
Date posted:
May 31, 2019
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Answers (1)
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The figure (a) below shows a distance -time graph of a motion of a body.In the figure (b), sketch the corresponding velocity-time graph for the...
(Solved)
The figure (a) below shows a distance -time graph of a motion of a body.In the figure (b), sketch the corresponding velocity-time graph for the same motion.
Date posted:
May 31, 2019
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Answers (1)
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The expression below is an equation for a radioactive element P. Element Q and R are the daughter nuclides. P, Q and R are not...
(Solved)
The expression below is an equation for a radioactive element P. Element Q and R are the daughter nuclides. P, Q and R are not the actual symbols of any of the elements.
Identify the element R and state two of its characteristics.
Date posted:
May 31, 2019
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Answers (1)
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The mass of the fabric of a large balloon is 100kg. The balloon is inflated with 200cm3 of helium. The balloon is attached to a...
(Solved)
The mass of the fabric of a large balloon is 100kg. The balloon is inflated with 200cm3 of helium. The balloon is attached to a cable fixed to the ground as shown.
(Density of air and helium are 1.25kg/m3 and 0.2kg/m3 respectively)
i) Indicate all the forces acting on the system.
ii) If the system is at equilibrium, write an equation relating the three forces in (i) above.
iii) Calculate the upthrust on the balloon.
Date posted:
May 31, 2019
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Answers (1)
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Explain why most of the x-ray tube is surrounded by lead metal.
(Solved)
Explain why most of the x-ray tube is surrounded by lead metal.
Date posted:
May 31, 2019
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Answers (1)
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Figure below shows circular waves approaching a plane barrier in uniform medium.
On the diagram sketch the reflected waves.
(Solved)
Figure below shows circular waves approaching a plane barrier in uniform medium.
On the diagram sketch the reflected waves.
Date posted:
May 31, 2019
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Answers (1)
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A house has two 100w bulbs, two 60w bulbs and one 75w bulb. Determine the cost of having all the bulbs switched on for 60...
(Solved)
A house has two 100w bulbs, two 60w bulbs and one 75w bulb. Determine the cost of having all the bulbs switched on for 60 hours, given that the cost of electricity is 50cents per kilowatt hour find the cost.
Date posted:
May 31, 2019
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Answers (1)
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Explain why objects float higher in salty water than in fresh water.
(Solved)
Explain why objects float higher in salty water than in fresh water.
Date posted:
May 31, 2019
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Answers (1)
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A person of mass 50kg is on a swing which has a speed of 10m/s at the lowest point of its motion. The ropes of...
(Solved)
A person of mass 50kg is on a swing which has a speed of 10m/s at the lowest point of its motion. The ropes of the swing
are 2.5m long, Find the tension of the ropes. (Take g = 10ms-2)
Date posted:
May 31, 2019
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Answers (1)
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A motorcycle is travelling at a constant speed of 72km/h around a circular track of radius 150m.
i) Determine its centripetal acceleration.
ii) How long does...
(Solved)
A motorcycle is travelling at a constant speed of 72km/h around a circular track of radius 150m.
i) Determine its centripetal acceleration.
ii) How long does the cyclist take to complete one full cycle of the track?
Date posted:
May 31, 2019
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Answers (1)
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Figure below shows an incident ray normal to the surface BC of a right-angled glass prism ABC. The critical angle of the glass is 420
Complete...
(Solved)
Figure below shows an incident ray normal to the surface BC of a right-angled glass prism ABC. The critical angle of the glass is 420
Complete the diagram to show the path of the ray.
Date posted:
May 31, 2019
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Answers (1)
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A current carrying conductor AB is in a magnetic field as shown in figure below.
a) Indicate the direction of the force F acting on the...
(Solved)
A current carrying conductor AB is in a magnetic field as shown in figure below.
a) Indicate the direction of the force F acting on the conductor.
b) State two factors that determine the direction of the force F.
Date posted:
May 31, 2019
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Answers (1)
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State two factors on which the linear speed of a body moving in a circular motion depends.
(Solved)
State two factors on which the linear speed of a body moving in a circular motion depends.
Date posted:
May 31, 2019
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Answers (1)
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A battery is rated 100AH. How long will it work if it steadily supplies a current of 2.5A
(Solved)
A battery is rated 100AH. How long will it work if it steadily supplies a current of 2.5A
Date posted:
May 31, 2019
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Answers (1)