Polarization
johnmulu answered the question on February 14, 2017 at 13:35
-
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
.
Answers (1)
-
State two ways by which the frequency of a note produced by a given guitar wire may be increased
(Solved)
State two ways by which the frequency of a note produced by a given guitar wire may be increased.
Date posted:
February 14, 2017
.
Answers (1)
-
State Ohm’s Law
(Solved)
State Ohm's Law.
Date posted:
February 14, 2017
.
Answers (1)
-
State one condition under which Ohm's law is obeyed in a metal conductor.
(Solved)
State one condition under which Ohm's law is obeyed in a metal conductor.
Date posted:
February 14, 2017
.
Answers (1)
-
A current of 0.70 A flows through a wire when a p.d. of 0.35 V is applied at the ends of the wire. If the wire is 0.5 m long...
(Solved)
A current of 0.70 A flows through a wire when a p.d. of 0.35 V is applied at the ends of the wire. If the wire is 0.5 m long and has a cross section area of 8.0 x 10-3m2. Determine its resistivity.
Date posted:
February 14, 2017
.
Answers (1)
-
A circuit consists of a battery, a metal wire, an ammeter and a switch connected in series. The switch is closed and the ammeter reading noted
(Solved)
A circuit consists of a battery, a metal wire, an ammeter and a switch connected in series. The switch is closed and the ammeter reading noted. The metal wire is now heated. State the observations made on the ammeter reading and give a reason for your answer.
Date posted:
February 14, 2017
.
Answers (1)
-
State the reason why a voltmeter of high resistance is more accurate in measuring potential differences than one of low resistance.
(Solved)
State the reason why a voltmeter of high resistance is more accurate in measuring potential differences than one of low resistance.
Date posted:
February 14, 2017
.
Answers (1)
-
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
.
Answers (1)
-
Define the term velocity ratio of a machine
(Solved)
Define the term velocity ratio of a machine.
Date posted:
February 14, 2017
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
Define the term efficiency of a machine
(Solved)
Define the term efficiency of a machine.
Date posted:
February 14, 2017
.
Answers (1)
-
A certain machine uses an effort of 400 N to raise a load of 60 0N. If the efficiency of the machine is 75%, determine its velocity ratio
(Solved)
A certain machine uses an effort of 400 N to raise a load of 600N. If the efficiency of the machine is 75%, determine its velocity ratio.
Date posted:
February 14, 2017
.
Answers (1)
-
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
.
Answers (1)
-
A certain machine raises 2.0 tonnes of water through 22 metres. If the efficiency of the machine is 80%, how much work is done on the machine?
(Solved)
A certain machine raises 2.0 tonnes of water through 22 metres. If the efficiency of the machine is 80%, how much work is done on the machine?
Date posted:
February 14, 2017
.
Answers (1)
-
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
.
Answers (1)
-
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
.
Answers (1)
-
State the reason why the amplitude of a simple pendulum decrease with time
(Solved)
State the reason why the amplitude of a simple pendulum decrease with time.
Date posted:
February 14, 2017
.
Answers (1)
-
Name a device used to convert light energy directly into electrical energy
(Solved)
Name a device used to convert light energy directly into electrical energy.
Date posted:
February 14, 2017
.
Answers (1)
-
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
.
Answers (1)