Get premium membership and access questions with answers, video lessons as well as revision papers.
1. The magnitude of the induced electromotive force (e.m.f) is directly proportional to the rate of change of magnetic field flux.
2. The direction of induced current flows in a direction such that as to oppose the changes producing it.
johnmulu answered the question on February 18, 2017 at 10:44
- Radiant heat from the sun penetrates a glass sheet while radiant heat from burning wood is cut off by the glass sheet. Explain(Solved)
Explain the fact that radiant heat from the sun penetrates a glass sheet while radiant heat from burning wood is cut off by the glass sheet.
Date posted: February 18, 2017. Answers (1)
- State the difference between X-rays and gamma rays in the way in which they are produced.(Solved)
State the difference between X-rays and gamma rays in the way in which they are produced.
Date posted: February 18, 2017. Answers (1)
- State the reasons why radio waves signals are easier to receive than TV (television) signals in a place surrounded by hills (Solved)
State the reasons why radio waves signals are easier to receive than TV (television) signals in a place surrounded by hills
Date posted: February 18, 2017. Answers (1)
- State two uses of microwaves.(Solved)
State two uses of microwaves.
Date posted: February 18, 2017. Answers (1)
- Arrange the following in order of increasing frequencies (Solved)
Arrange the following in order of increasing frequencies - Gamma radiation, Radio waves, Infrared, and X - rays
Date posted: February 18, 2017. Answers (1)
- A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height.(Solved)
A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height. State a reason why the balloon stops rising.
Date posted: February 18, 2017. Answers (1)
- a)State the condition necessary for a body to float in fluid
b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water(Solved)
a) State the condition necessary for a body to float in fluid
b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water. Explain this observation.
Date posted: February 18, 2017. Answers (1)
- State the law of flotation (Solved)
State the law of flotation
Date posted: February 18, 2017. Answers (1)
- When a piece of metal is placed on water, it sinks. But when the same piece of metal is placed on a block of wood, both are found to float. (Solved)
When a piece of metal is placed on water, it sinks. But when the same piece of metal is placed on a block of wood, both are found to float. Explain this observation.
Date posted: February 18, 2017. Answers (1)
- A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)(Solved)
A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)
Date posted: February 18, 2017. Answers (1)
- A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N(Solved)
A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N. Determine the density of the wood.
Date posted: February 18, 2017. Answers (1)
- Ice cubes float on water and solid benzene sinks in liquid benzene, Explain(Solved)
Explain the following observation: Ice cubes float on water and solid benzene sinks in liquid benzene
Date posted: February 18, 2017. Answers (1)
- A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float.(Solved)
A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float. Explain this observation.
Date posted: February 18, 2017. Answers (1)
- When a bus goes a round bend on a flat road, it experiences a centripetal force, State what provides the centripetal force and the purpose of banking roads at bends. (Solved)
a) When a bus goes a round bend on a flat road, it experiences a centripetal force. State what provides the centripetal force
b) State the purpose of banking roads at bends.
Date posted: February 18, 2017. Answers (1)
- Explain applications of uniform circular motion in daily life. (Solved)
Explain applications of uniform circular motion in daily life.
Date posted: February 18, 2017. Answers (1)
- State two ways in which the centripetal force on a body can be increased.(Solved)
State two ways in which the centripetal force on a body can be increased.
Date posted: February 18, 2017. Answers (1)
- Define the term angular velocity(Solved)
Define the term angular velocity
Date posted: February 18, 2017. Answers (1)
- A body mass 0.50 kg is attached to the end of a string of length 50 cm and Whirled in a horizontal circle. If the tension in the string is 81N, Determine the velocity of the body. (Solved)
A body mass 0.50 kg is attached to the end of a string of length 50 cm and Whirled in a horizontal circle. If the tension in the string is 81N, Determine the velocity of the body.
Date posted: February 18, 2017. Answers (1)
- A car of mass 1200 kg is moving with a velocity of 25ms-1 around a flat bend of radius 150m. Determine the minimum frictional force between the tyres and the road that will prevent the car from sliding off(Solved)
A car of mass 1200 kg is moving with a velocity of 25ms-1 around a flat bend of radius 150m. Determine the minimum frictional force between...
Date posted: February 18, 2017. Answers (1)
- Explain why a pail of water can be swung in vertical circle without the water pouring out.(Solved)
Explain why a pail of water can be swung in vertical circle without the water pouring out.
Date posted: February 18, 2017. Answers (1)