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A1V1 = A2V2
30 x 4 = 7.5 x A2
A2= 16 cm2
Wilfykil answered the question on March 26, 2019 at 08:42
- An object moving at 26m/s starts to accelerate at 2m/s² so that its velocity becomes 48m/s. Find
i) The distance moved during this acceleration.
ii) The...(Solved)
An object moving at 26m/s starts to accelerate at 2m/s² so that its velocity becomes 48m/s. Find
i) The distance moved during this acceleration.
ii) The object is now braked so that it comes to rest in a time of 12 seconds. Find the braking force if its mass was 27000g.
Date posted: March 26, 2019. Answers (1)
- Figure below shows velocity time graphs for two objects A and B drawn on the same axes.(Solved)
Figure below shows velocity time graphs for two objects A and B drawn on the same axes.
State with a reason which of the two objects stops in a shorter distance when the same size of force in applied against each given that they are of equal masses.
Date posted: March 26, 2019. Answers (1)
- A pupil blows a current of air over the surface of a sheet of paper held close to its mouth. State and explain what happens...(Solved)
A pupil blows a current of air over the surface of a sheet of paper held close to its mouth. State and explain what happens to the paper.
Date posted: March 26, 2019. Answers (1)
- The figure below shows water forces through a hydraulic system by a pump. An air chamber is used to maintain a continuous flow of water...(Solved)
The figure below shows water forces through a hydraulic system by a pump. An air chamber is used to maintain a continuous flow of water during both the up-stroke and down-stroke of the piston pump.
Explain how the continuous flow of water is maintained.
Date posted: March 26, 2019. Answers (1)
- Figure below shows block A placed on a bench connected with a piece of thread through a pulley to a pan B where masses are...(Solved)
Figure below shows block A placed on a bench connected with a piece of thread through a pulley to a pan B where masses are being added.
State a condition that must be met for block A to slide towards the right.
Date posted: March 26, 2019. Answers (1)
- When spraying a field of water using a hose pipe, it is common to reduce the pipes opening in order to spray water furthest. Other...(Solved)
When spraying a field of water using a hose pipe, it is common to reduce the pipes opening in order to spray water furthest. Other than pressure, what other quality is varied in the process?
Date posted: March 26, 2019. Answers (1)
- Distinguish between the following terms
(i) Intensity and loudness
(ii) Frequency and pitch(Solved)
Distinguish between the following terms
(i) Intensity and loudness
(ii) Frequency and pitch
Date posted: March 26, 2019. Answers (1)
- Sound is very faint in high altitudes than at sea level. Why?(Solved)
Sound is very faint in high altitudes than at sea level. Why?
Date posted: March 26, 2019. Answers (1)
- Figure below shows a gas enclosed in a container.(Solved)
Figure below shows a gas enclosed in a container.
State and explain using the kinetic theory of matter. What will happen to the piston when the cylinder is heated.
Date posted: March 26, 2019. Answers (1)
- Figure below shows air molecules in front of a hollow wooden box P set vibrating by a tuning fork T of frequency 800Hz.(Solved)
Figure below shows air molecules in front of a hollow wooden box P set vibrating by a tuning fork T of frequency 800Hz.
(a) What is the purpose of fixing the tuning fork on the box which is open on one end?
(b) Name the section labeled X and Y
(c) State and explain the nature of the waves shown
(d) Given that the speed of sound in air is 330ms-1. Calculate the wavelength of the waves.
Date posted: March 26, 2019. Answers (1)
- Differentiate between displacement and distance.(Solved)
Differentiate between displacement and distance.
Date posted: March 26, 2019. Answers (1)
- Figure 7(a) below shows a loop of a wire with a string tied loosely at point A and B. When the loop was dipped into...(Solved)
Figure 7(a) below shows a loop of a wire with a string tied loosely at point A and B. When the loop was dipped into a soap solution and then moved out a soap film is formed as shown. In fig 7(b) below. State and hence explain the observation made when side X of the film is broken.
Date posted: March 26, 2019. Answers (1)
- Describe an experiment to show that sound cannot travel in a vacuum.(Solved)
Describe an experiment to show that sound cannot travel in a vacuum.
Date posted: March 26, 2019. Answers (1)
- Figure below shows an inverted funnel placed above a light ball.(Solved)
Figure below shows an inverted funnel placed above a light ball.
Fast moving air is then blown through the neck of the funnel. State and explain the observation made.
Date posted: March 26, 2019. Answers (1)
- The work done in stretching a spring by 50mm is given as 0.08J. Calculate the spring constant.(Solved)
The work done in stretching a spring by 50mm is given as 0.08J. Calculate the spring constant.
Date posted: March 26, 2019. Answers (1)
- A gun is fired and an echo heard at the same place 0.5s later. How far is the barrier, which reflected the sound from the...(Solved)
A gun is fired and an echo heard at the same place 0.5s later. How far is the barrier, which reflected the sound from the gun? (Speed of sound 330m/s).
Date posted: March 26, 2019. Answers (1)
- Figure below shows a thick copper plate that is very hot, one side is black and the other is shiny. Two thermometers are placed at...(Solved)
Figure below shows a thick copper plate that is very hot, one side is black and the other is shiny. Two thermometers are placed at the same distance from each side as shown.
Neglecting heat loss to the surrounding, state with a reason which thermometer records a higher temperature after 10 minutes.
Date posted: March 26, 2019. Answers (1)
- Two identical sources of sound S1 and S2 are emitting the same frequency. Explain with reasons, the observations that will be made by an observe...(Solved)
Two identical sources of sound S1 and S2 are emitting the same frequency. Explain with reasons, the observations that will be made by an observe listening to the sound emitted who was moving slowly along the lines, PQ and MN
Date posted: March 26, 2019. Answers (1)
- State the reason why steel is normally used to reinforce concrete in construction other than aluminium(Solved)
State the reason why steel is normally used to reinforce concrete in construction other than aluminium
Date posted: March 26, 2019. Answers (1)
- Standing waves are set up in a rope resulting in a series of nodes and antinodes.
In what state of motion is the rope at the...(Solved)
Standing waves are set up in a rope resulting in a series of nodes and antinodes.
In what state of motion is the rope at the nodes?
Date posted: March 26, 2019. Answers (1)