1. Pressure is higher than normal atmospheric pressure
2. Presence of impurities
johnmulu answered the question on February 18, 2017 at 05:11
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Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
(Solved)
Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
Date posted:
February 15, 2017
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Answers (1)
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Water of mass 3 kg, at a temperature of 90oC is allowed to cool for 10 minutes. state two factors that determine the final temperature.
(Solved)
Water of mass 3 kg, at a temperature of 90oC is allowed to cool for 10 minutes. State two factors, other than humidity, that determine the final temperature.
Date posted:
February 15, 2017
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Answers (1)
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A heating coil is rated 100 W, 240 V. At what rate would it dissipate energy it is connected to a 220 V supply
(Solved)
A heating coil is rated 100 W, 240 V. At what rate would it dissipate energy it is connected to a 220 V supply
Date posted:
February 15, 2017
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Answers (1)
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An electric bulb with a filament of resistance 480 ohms is connected to a 240 V mains supply. Determine the energy dissipated in 2 minutes
(Solved)
An electric bulb with a filament of resistance 480 ohms is connected to a 240 V mains supply. Determine the energy dissipated in 2 minutes
Date posted:
February 15, 2017
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Answers (1)
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An electric heater rated 240 V, 3000 W is to be connected to a 240 V mains supply, through a 10 A fuse.Determine whether the fuse is suitable or not
(Solved)
An electric heater rated 240 V, 3000 W is to be connected to a 240 V mains supply, through a 10 A fuse. Determine whether the fuse is suitable or not
Date posted:
February 15, 2017
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Answers (1)
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State three factors that affect the capacitance of a parallel plate capacitor
(Solved)
State three factors that affect the capacitance of a parallel plate capacitor
Date posted:
February 15, 2017
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Answers (1)
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In an experiment using a ripple tank the frequency, f, of the electric pulse generator was reduced to one third of its value
(Solved)
In an experiment using a ripple tank the frequency, f, of the electric pulse generator was reduced to one third of its value. How does the new wavelength compare with the initial wavelength? Explain your answer.
Date posted:
February 14, 2017
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Answers (1)
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State Ohm’s Law
(Solved)
State Ohm's Law.
Date posted:
February 14, 2017
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Answers (1)
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In large current circuits, large resistors in parallel are preferred to low resistors in series. Explain
(Solved)
In large current circuits large resistors in parallel are preferred to low resistors in series. Explain.
Date posted:
February 14, 2017
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Answers (1)
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State two reasons why the efficiency of a pulley system is always less than 100%
(Solved)
State two reasons why the efficiency of a pulley system is always less than 100%.
Date posted:
February 14, 2017
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Answers (1)
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A cyclist initially at rest moved down a hill without pedaling. He applied brakes and eventually stopped
(Solved)
A cyclist initially at rest moved down a hill without pedaling. He applied brakes and eventually stopped. State the energy changes as the cyclist moved down the hill.
Date posted:
February 14, 2017
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Answers (1)
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A crane lift a load of 2000 kg through a vertical distance of 3.0 m in 6 seconds. Determine the (i) Work done
(Solved)
A crane lift a load of 2000 kg through a vertical distance of 3.o m in 6 seconds.Determine the:
i) Work done
ii) Power development by the crane
iii) Efficiency of the crane given that it is operated by an electric motor rated 12.5 KW.
Date posted:
February 14, 2017
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Answers (1)
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If a load on 100 N is raised by applying an effort of 28 N, determine the efficiency of the system
(Solved)
If a load on 100 N is raised by applying an effort of 28 N, determine the efficiency of the system.
Date posted:
February 14, 2017
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Answers (1)
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A body of mass M is allowed to slide down an inclined plane. State two factors that affects its final velocity at the bottom of the incline.
(Solved)
A body of mass M is allowed to slide down an inclined plane. State two factors that affects its final velocity at the bottom of the incline.
Date posted:
February 14, 2017
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Answers (1)
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A horizontal force of 12 N is applied on a wooden block of mass 2 kg placed on a horizontal surface. It causes the block to accelerate at 5 ms-2
(Solved)
A horizontal force of 12N is applied on a wooden block of mass 2 kg placed on a horizontal surface. It causes the block to accelerate at 5 ms-2. Determine the frictional force between the block and the surface.
Date posted:
February 14, 2017
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Answers (1)
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A car of mass 30 kg is pushed along a horizontal path by horizontal force of 8 N and moves with a constant velocity.
(Solved)
A car of mass 30 kg is pushed along a horizontal path by horizontal force of 8 N and moves with a constant velocity. The force is then increased to 14N. Determine:
a) The resistance to the motion of the cart;
b) The acceleration of the cart.
Date posted:
February 14, 2017
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Answers (1)
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A trolley is moving at a uniform speed along a track. A piece of plasticine is dropped on the trolley and sticks on it. Explain why the trolley slows down
(Solved)
A trolley is moving at a uniform speed along a track. A piece of plasticine is dropped on the trolley and sticks on it. Explain why the trolley slows down.
Date posted:
February 14, 2017
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Answers (1)
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A high jumper usually lands on thick soft mattress. Explain how the mattress helps in reducing the force of impact
(Solved)
A high jumper usually lands on thick soft mattress. Explain how the mattress helps in reducing the force of impact.
Date posted:
February 14, 2017
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Answers (1)
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An industrial trolley of mass 20 kg carrying a mass of 50 kg is acted on by a constant force. The trolley moves along a horizontal smooth surface with an acceleration of 0.5ms-2
(Solved)
An industrial trolley of mass 20 kg carrying a mass of 50 kg is acted on by a constant force. The trolley moves along a horizontal smooth surface with an acceleration of 0.5 ms-2. Determine the acceleration of the trolley after the mass falls off.
Date posted:
February 14, 2017
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Answers (1)
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A gun is fired vertically upwards from the top of an open truck moving horizontally, uniform velocity of 50ms-1. The bullet achieves a maximum height of 45 m
(Solved)
A gun is fired vertically upwards from the top of an open truck moving horizontally, uniform velocity of 50ms-1. The bullet achieves a maximum height of 45 m.
i) State with reason whether or not the bullet will land on the truck
ii) Calculate the distance covered by the truck just before the bullet reaches the level from which it was fired. (Use g = 10 ms-2)
Date posted:
February 14, 2017
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Answers (1)