- Highest speed expected
- Radius of the band.
sharon kalunda answered the question on March 26, 2019 at 09:25
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A stone of mass 200g tied to a long string 1m long and whirled round in a vertical circle at an angular speed of 6.28 rad/s.
i) Why is the stone said to be accelerating.
ii) Determine the linear velocity.
iii) Its periodic time.
iv) The critical speed of the stone if it is to describe a vertical circle.
Date posted: March 26, 2019. Answers (1)
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Figure below shows a small mass being rotated in a horizontal circle through a plastic tube. It is observed that as the small moves is rotated at constant speed, the heavy mass remains at the same horizontal level.
i) State one adjustment that can be done to make the heavy mass move upwards.
ii) State the effect on the small mass if a heavier mass was used in place of the one above and the radius of rotation remains constants.
Date posted: March 26, 2019. Answers (1)
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A mass is projected horizontally from height of 5m above the ground with a velocity of 30m/s. Calculate:
a) The time taken to reach the ground
b) The horizontal distance traveled before hitting the ground
c) The vertical velocity with which the mass hits the ground
Date posted: March 26, 2019. Answers (1)
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Figure below shows a block of dimensions 2cm × 4cm × 12cm floating in a liquid of density 1250kg/m³
Find
i) The upthrust on the block.
ii) The weight of the block.
iii) The force needed to just submerge the block completely.
Date posted: March 26, 2019. Answers (1)
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Date posted: March 26, 2019. Answers (1)
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Figure below shows a test tube floating in water in a tall beaker.
i) State what can be done to make the text tube floating vertically upright.
ii) Explain how the test tube may be calibrated to measure relative densities of liquids.
iii) State what can be done to increase the sensitivity of such an instrument.
Date posted: March 26, 2019. Answers (1)
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a) The horizontal distance from the table at which the...(Solved)
A block slides off a horizontal table 4 meters high with a velocity of 12-m/s. Find:
a) The horizontal distance from the table at which the block hits the floor.
b) The horizontal and vertical components of the velocity when it reaches the floor.
Date posted: March 26, 2019. Answers (1)
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Date posted: March 26, 2019. Answers (1)
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Date posted: March 26, 2019. Answers (1)
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To determine the specific heat capacity of a solid by the method of mixtures, a solid of known mass was heated in blust furnace to very high temperature then quickly transferred to a liquid in a well lagged calorimeter.
i) Give a reason why the solid was quickly transferred.
ii) List two possible sources of error in this experiment.
Date posted: March 26, 2019. Answers (1)
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Define specific heat capacity.
Date posted: March 26, 2019. Answers (1)
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Date posted: March 26, 2019. Answers (1)
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The diagram below shows part of the motion of a tennis ball, which is projected vertically upwards from the ground and allowed to bounce on the ground. Use this information to answer questions that follow.
a) Describe the motion of the ball relating it to different positions of the ball along the following AB, BC, CDE.
b) From the graph, calculate the acceleration due to gravity.
c) How high does the ball rise initially?
d) Explain why E is not at the same level as A.
Date posted: March 26, 2019. Answers (1)
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The figure below shows a loading ramp of length 8m and height 2m. Bags weighing 1000N each are conveyed from point O to P along the plane. Each bag experiences a friction force of 50N.
Show that the velocity ratio is given by 1/Sin 0
Date posted: March 26, 2019. Answers (1)
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Figure below shows a pulley system used to lift a load.
Determine the velocity ratio.
Date posted: March 26, 2019. Answers (1)
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Water flows along a horizontal pipe of cross sectional area 30cm2. The speed of the water is 4m/s but it reaches 7.5m/s in a constriction in the pipe. Calculate the area of the constriction.
Date posted: March 26, 2019. Answers (1)
- 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)
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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)