-
The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the...
(Solved)
The distance between an upright image and the object produced by a thin lens is 40cm. The image is 3 times as tall as the object.
i) State the type of lens used.
ii) Determine the object distance.
iii) Determine the radius of curvature.
iv) State one application of the lens as used in question (b) above.
Date posted:
September 12, 2019
.
Answers (1)
-
What is meant by a step-up transformer?
(Solved)
What is meant by a step-up transformer?
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below shows part of the lighting circuit of a house.
(Solved)
The figure below shows part of the lighting circuit of a house.
i) Explain why a fuse is included in the circuit.
ii) Explain why the fuse is placed in the live wire rather than in the neutral wire.
iii) Each lamp has a power of 60 W. Calculate the current through one lamp when it is switched on.
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below shows a section of a flexible wire carrying current perpendicularly out of the paper.The wire moves in the direction shown as current...
(Solved)
The figure below shows a section of a flexible wire carrying current perpendicularly out of the paper.The wire moves in the direction shown as current passes through it.
i) Label the polarities of the magnets A and B.
ii) Explain the behaviour of the flexible wire.
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m
(Solved)
The figure below shows a rectangular object of mass 100kg tethered to the sea-bed by a wire. The dimension are 4m ×1.5m × 2m
Calculate the:
i) Weight of sea water displaced by the buoy (density of sea water = 1100kgm-3)
ii) Upward force exerted on the buoy by the water.
iii) The tension on the string.
Date posted:
September 12, 2019
.
Answers (1)
-
The diagram below shows two parallel mirrors M1 and M2 and a ray of light being incident on one of the mirrors as shown. Trace...
(Solved)
The diagram below shows two parallel mirrors M1 and M2 and a ray of light being incident on one of the mirrors as shown. Trace the ray of light through the mirrors.
Date posted:
September 12, 2019
.
Answers (1)
-
State the unit specific latent heat of a substance.
(Solved)
State the unit specific latent heat of a substance.
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.
(Solved)
The figure below shows a bimetallic strip in electric circuit made of two metals A and B. B expands more than A.
X and Y are metal contact while P and Q are identical bulbs. Explain the effect on the bulb when ice cold water is poured onto the strip.
Date posted:
September 12, 2019
.
Answers (1)
-
Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.
(Solved)
Three identical springs each of spring constant 10N/m and weight 0.5N are used to support a load as shown.
Determine the total extension of the system.
Date posted:
September 12, 2019
.
Answers (1)
-
The graph below is a sketch of a velocity-time graph of a car which was travelling at a constant velocity before the brakes were applied....
(Solved)
The graph below is a sketch of a velocity-time graph of a car which was travelling at a constant velocity before the brakes were applied. Calculate the distance traveled after the brakes were applied.
Date posted:
September 12, 2019
.
Answers (1)
-
Distinguish between threshold frequency and threshold wavelength.
(Solved)
Distinguish between threshold frequency and threshold wavelength.
Date posted:
September 12, 2019
.
Answers (1)
-
Give a reason why lecture theatre halls are covered with soft perforated materials.
(Solved)
Give a reason why lecture theatre halls are covered with soft perforated materials.
Date posted:
September 12, 2019
.
Answers (1)
-
Explain why a p-n junction diode will conduct when connected in forward bias.
(Solved)
Explain why a p-n junction diode will conduct when connected in forward bias.
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below shows a combination of capacitors across a power supply.
(Solved)
The figure below shows a combination of capacitors across a power supply.
Determine the energy stored in the system of capacitors.
Date posted:
September 12, 2019
.
Answers (1)
-
State one differences between an image formed by a plane mirror and that observed through a pinhole camera.
(Solved)
State one differences between an image formed by a plane mirror and that observed through a pinhole camera.
Date posted:
September 12, 2019
.
Answers (1)
-
The diagram below shows an electrical appliance connected to the mains.
(Solved)
The diagram below shows an electrical appliance connected to the mains.
I. Name the color codes for leads A and B
II. What is the purpose of the fuse.
Date posted:
September 12, 2019
.
Answers (1)
-
A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
(Solved)
A car of mass 800kg starts and accelerates at 1.2ms-2. Determine its momentum after it has moved 400m from the starting point.
Date posted:
September 12, 2019
.
Answers (1)
-
The figure below represents a sphere 0.012m³ volume and mass 5kg floating between two liquids A and B such that 2/3 of its volume is...
(Solved)
The figure below represents a sphere 0.012m³ volume and mass 5kg floating between two liquids A and B such that 2/3 of its volume is in liquid A. Density of liquid B is 800kg/m³
(Take g = 10N/kg).
a.Determine
(i) Weight of liquid B displacement.
(ii) Weight of liquid A displaced.
iii) Volume of A.
b.The sphere is now anchored at the base of the container that ¼ of its volume is in liquid A. Find the tension in the string.
Date posted:
September 12, 2019
.
Answers (1)
-
Calculate the total power in lifting 0.2kg of metal cane containing 2000cm³ of ice onto a lorry as shown below within 4S. Density of ice...
(Solved)
Calculate the total power in lifting 0.2kg of metal cane containing 2000cm³ of ice onto a lorry as shown below within 4S. Density of ice is 0.9g/cm³
Date posted:
September 12, 2019
.
Answers (1)
-
Explain the energy change that occur when a man climbs the mountain.
(Solved)
Explain the energy change that occur when a man climbs the mountain.
Date posted:
September 12, 2019
.
Answers (1)