Get premium membership and access questions with answers, video lessons as well as revision papers.
- Earth A by touching
-Break the earthing while B is still in place
-Take B away and A will be positively charged
Kavungya answered the question on October 17, 2019 at 10:33
- 500g of water at 200C is mixed with 200g of water at 550C. Find the final temperature of the mixture. (Solved)
500g of water at 200C is mixed with 200g of water at 550C. Find the final temperature of the mixture.
Date posted: October 17, 2019. Answers (1)
- A car moving initially at 10m/s decelerates at 2.5m/s2
Determine:
i)I) Its velocity after 1.5seconds.
II)The distance travelled in 1.5 seconds.
III)The time taken for the car to stop.
ii)Sketch...(Solved)
A car moving initially at 10m/s decelerates at 2.5m/s2
Determine:
i)I) Its velocity after 1.5seconds.
II)The distance travelled in 1.5 seconds.
III)The time taken for the car to stop.
ii)Sketch the velocity – time graph for the motion of the car up to the time the car stopped.
iii)From the graph determine the distance the car travelled before stopping.
Date posted: October 17, 2019. Answers (1)
- The diagram below shows a six’s maximum/ minimum thermometer.
a)What is the thermometric liquid in this thermometer?
b)Why is it necessary for the vapour in bulb B...(Solved)
The diagram below shows a six’s maximum/ minimum thermometer.
)What is the thermometric liquid in this thermometer?
b)Why is it necessary for the vapour in bulb B to be saturated?
c)Explain how the thermometer indicates maximum and minimum temperature.
d)Indicate on the diagram the two points where the reading of the temperature shown by the
thermometer can be made.
Date posted: October 17, 2019. Answers (1)
- Use the figure below to answer the questions that follow
i)What pressure is acting on point A?
ii)What is the value of pressure difference in the...(Solved)
Use the figure below to answer the questions that follow
i)What pressure is acting on point A?
ii)What is the value of pressure difference in the instrument reading?
iii)If the atmospheric pressure is 760mm of mercury, what is the value of gas pressure?
Date posted: October 17, 2019. Answers (1)
- The figure below shows an incompressible fluid moving through a tube of varied cross- sectional area. If the area of the small tube is 0.05m2,...(Solved)
The figure below shows an incompressible fluid moving through a tube of varied cross- sectional area. If the area of the small tube is 0.05m2, calculate the diameter of the large tube in cm.
Date posted: October 17, 2019. Answers (1)
- The figure below shows two light sheets of paper arranged as shown.
Explain the observation made when air is blown at the same speed and time...(Solved)
The figure below shows two light sheets of paper arranged as shown.
Explain the observation made when air is blown at the same speed and time at points A and B.
Date posted: October 17, 2019. Answers (1)
- Distinguish between streamline and turbulent flow.(Solved)
Distinguish between streamline and turbulent flow.
Date posted: October 17, 2019. Answers (1)
- Explain why an iron gate feels colder when touched but its wooden gatepost feels warm at night.(Solved)
Explain why an iron gate feels colder when touched but its wooden gatepost feels warm at night.
Date posted: October 17, 2019. Answers (1)
- A bullet of mass 20g moving with a velocity of 30m/s penetrates a sand bag and it’s brought to rest in 0.05 seconds. Find the...(Solved)
A bullet of mass 20g moving with a velocity of 30m/s penetrates a sand bag and it’s brought to rest in 0.05 seconds. Find the average retarding force of the sand.
Date posted: October 17, 2019. Answers (1)
- A tightly fitted bottle cork will be easier to remove if the bottle is warmed. Explain this using kinetic and thermal property of matter.(Solved)
A tightly fitted bottle cork will be easier to remove if the bottle is warmed.
Explain this using kinetic and thermal property of matter.
Date posted: October 17, 2019. Answers (1)
- State one way of increasing sensitivity of mercury in glass thermometer.(Solved)
State one way of increasing sensitivity of mercury in glass thermometer.
Date posted: October 17, 2019. Answers (1)
- The figure below is that of identical springs. A 60N weight is attached on the springs as shown
so that the total extension for the...(Solved)
The figure below is that of identical springs. A 60N weight is attached on the springs as shown
so that the total extension for the system is 6cm. Calculate the spring constant of one spring.
Date posted: October 17, 2019. Answers (1)
- A mercury barometer reads 75cmHg at the base of Mt.Kenya. Assuming that the height of
the mountain is 1088m and the average density of air...(Solved)
A mercury barometer reads 75cmHg at the base of Mt.Kenya. Assuming that the height of
the mountain is 1088m and the average density of air is 1.25kg/m3. What is the reading of the
barometer at the top of the mountain? (Take density of mercury is 13.6g/cm3.)
Date posted: October 17, 2019. Answers (1)
- The figure below is that of a uniform meter rule supported at the 30cm. A load of 5N is attached at
the 0cm mark and...(Solved)
The figure below is that of a uniform meter rule supported at the 30cm. A load of 5N is attached at
the 0cm mark and that of 2N to a pulley at the 100cm mark. Calculate the weight of the meter rule.
Date posted: October 17, 2019. Answers (1)
- Before using a vernier calipers to measure diameter of a steel ball, a student confirmed that it had a zero error of -0.03cm. The figure...(Solved)
Before using a vernier calipers to measure diameter of a steel ball, a student confirmed that it had a zero error of -0.03cm. The figure below shows the vernier calipers scale when in use.
State the correct diameter of the steel ball.
Date posted: October 17, 2019. Answers (1)
- A conductor through which an electric current is flowing into the paper in a magnetic field as shown in figure below.
On the same diagram sketch...(Solved)
A conductor through which an electric current is flowing into the paper in a magnetic field as shown in figure below.
On the same diagram sketch the resulting magnetic field pattern and show the direction of the resulting mechanical force F, on the conductor.
Date posted: October 3, 2019. Answers (1)
- Figure below shows a solenoid with a ferromagnetic core connected to a battery E, ammeter A and rheostat R
On the figure indicate;
(i)The direction of current...(Solved)
Figure below shows a solenoid with a ferromagnetic core connected to a battery E, ammeter A and rheostat R
On the figure indicate;
(i)The direction of current in the external circuit and around the coils.
(ii)The polarity of the resulting electromagnet
(iii)The direction of the magnetic field lines created around the solenoid
Date posted: October 3, 2019. Answers (1)
- State and explain a rule you would apply to determine the direction of the magnetic flux round a conductor carrying an electric current.(Solved)
State and explain a rule you would apply to determine the direction of the magnetic flux round a conductor carrying an electric current.
Date posted: October 3, 2019. Answers (1)
- The figure below shows a transparent water tank containing water. An electric lamp surrounded by a shield with a narrow slit of fixed at corner...(Solved)
The figure below shows a transparent water tank containing water. An electric lamp surrounded by a shield with a narrow slit of fixed at corner A of the tank. A light ray from the slit shines on the water surface BC, at an angle of 48o as shown.
a)Determine the angle of refraction for the ray shown.
b)Complete the ray diagram to show the refracted ray.
c)Determine the angle of incidence for which the angle of refraction is 90o.
d)Calculate the speed of light in water.
Date posted: October 3, 2019. Answers (1)
- A ray of light is incident at an angle of 30o to the mirror positioned along the line M, a shown in figure below
By what...(Solved)
A ray of light is incident at an angle of 30o to the mirror positioned along the line M, a shown in figure below
By what angle should the mirror be rotated about 0 to the position M2 for the reflected ray to pass along M1
Date posted: October 3, 2019. Answers (1)