(i) (I) F =ke = 25 x 0.03 = 0.75 N.
(II) F = ma = 0.75 = 2a = a = 0.375 m/s2
(ii) Force in spring decreases as spring recovers original length. No force on trolley after contact with is lost
johnmulu answered the question on May 16, 2017 at 06:17
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Figure 12 shows a lorry towing a trailer using a rope.
(Solved)
Figure 12 shows a lorry towing a trailer using a rope.
The lorry exerts a force N on the trailer and the trailer exerts an equal but opposite force M on the lorry. The frictional force between the trailer and the road is F. Explain how the forces N, M and F enable the trailer to move
Date posted:
May 16, 2017
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Answers (1)
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Figure 5 is graph of net force on a body against its velocity as it falls through a liquid.
(Solved)
Figure 5 is graph of net force on a body against its velocity as it falls through a liquid.
Determine the terminal velocity of the body.
Date posted:
May 16, 2017
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Answers (1)
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Two identical spherical steel balls are released from the top of two tall jars containing liquids L1 and L2 respectively. Figure 3 shows the velocity-time graph of the motion of the balls.
(Solved)
Two identical spherical steel balls are released from the top of two tall jars containing liquids L1 and L2 respectively. Figure 3 shows the velocity-time graph of the motion of the balls.
Explain the nature of the curves and state why they are different.
Date posted:
May 16, 2017
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Answers (1)
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A ray of light incident on the surface of a glass prism is observed to behave as represented in the diagram in Fig.6
(Solved)
A ray of light incident on the surface of a glass prism is observed to behave as represented in the diagram in Fig.6
Explain this observation.
Date posted:
May 15, 2017
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Answers (1)
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The graph in figure 10 shows the velocity of a car in the first 8 seconds as it accelerates from rest along a straight line.
(Solved)
The graph in figure 10 shows the velocity of a car in the first 8 seconds as it accelerates from rest along a straight line.
Determine the distance traveled 3.0 seconds after the start.
Date posted:
May 15, 2017
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Answers (1)
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Figure 12 shows the path of a light ball projected horizontally.
(Solved)
Figure 12 shows the path of a light ball projected horizontally.
Explain how the ball attains the new path.
Date posted:
May 15, 2017
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Answers (1)
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Figure 9 shows a velocity-time graph for the motion of a body of mass 2 kg.
(Solved)
Figure 9 shows a velocity-time graph for the motion of a body of mass 2 kg.
Use the graph to determine the:
(i) Displacement of the body after 8 seconds
(ii) Acceleration after point B;
(iii) Force acting on the body in part (a) (ii).
Date posted:
May 15, 2017
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Answers (1)
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Figure 2 shows a section of a curved surface ABCD. Point A is higher than Point B while BCD is horizontal. Part ABC is smooth while CD is rough. A mass m is released from rest at A and moves towards D.
(Solved)
Figure 2 shows a section of a curved surface ABCD. Point A is higher than Point B while BCD is horizontal. Part ABC is smooth while CD is rough. A mass m is released from rest at A and moves towards D.
State the changes in the velocity of m between:
(a) B and C;
(b) C and D;
Date posted:
May 15, 2017
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Answers (1)
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Figure 9 shows graph of velocity against time for a ball bearing released at the surface of viscous liquid.
(Solved)
Figure 9 shows graph of velocity against time for a ball bearing released at the surface of viscous liquid.
Explain the motion of the ball bearing for parts.
(i) OA
(ii) AB
Date posted:
May 15, 2017
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Answers (1)
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Figure 3 shows a graph of velocity against time for a moving body.
(Solved)
Figure 3 shows a graph of velocity against time for a moving body.
Describe the motion of the body during the 10 seconds
Date posted:
May 15, 2017
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Answers (1)
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Figure 9 shows a velocity-time graph for the motion of a certain body.
(Solved)
Figure 9 shows a velocity-time graph for the motion of a certain body.
Describe the motion of the body in the region;
(i) OA; (ii) AB; (iii) BC;
Date posted:
May 15, 2017
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Answers (1)
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The graph below shows how the velocity varies with time for a body thrown vertically upwards.
(Solved)
The graph below shows how the velocity varies with time for a body thrown vertically upwards.
Determine the total distance moved by the body.
Date posted:
May 15, 2017
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Answers (1)
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Figure 9 shows a speed-time graph for the journey of a motor car.
(Solved)
Figure 9 shows a speed-time graph for the journey of a motor car.
Determine the distance the car travels in the first 40 seconds.
Date posted:
May 15, 2017
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Answers (1)
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Figure 5 shows air flowing through a pipe of different cross-sectional areas. Two pipes A and B are dipped into water.
(Solved)
Figure 5 shows air flowing through a pipe of different cross-sectional areas. Two pipes A and B are dipped into water.
Explain the cause of the difference in the levels of water in the pipes A and B.
Date posted:
May 15, 2017
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Answers (1)
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Figure 5 shows a Bunsen burner.
(Solved)
Figure 5 shows a Bunsen burner.
Explain how air is drawn into the burner when the gas tap is opened.
Date posted:
May 15, 2017
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Answers (1)
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Figure 5 shows parts A, B and C of a glass tube.
(Solved)
Figure 5 shows parts A, B and C of a glass tube.
State with a reason the part of the tube in which the pressure will be lowest when air is blown through the tube from A towards C.
Date posted:
May 15, 2017
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Answers (1)
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Figure 7 shows part of a petrol engine, in which air flowing under atmospheric pressure passes into a constriction, where it mixes with petrol. The mixture then flows into a combustion cylinder.
(Solved)
Figure 7 shows part of a petrol engine, in which air flowing under atmospheric pressure passes into a constriction, where it mixes with petrol. The mixture then flows into a combustion cylinder.
Explain what causes the petrol to move from the petrol chamber to the air steam in the constriction when the piston is moved downwards.
Date posted:
May 15, 2017
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Answers (1)
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Figure 4 shows a horizontal tube with two vertical tubes x and y. Water flows through the horizontal tube from right to left. The water level in the tube x is higher than water level in tube y
(Solved)
Figure 4 shows a horizontal tube with two vertical tubes x and y. Water flows through the horizontal tube from right to left. The water level in the tube x is higher than water level in tube y
Explain this observation.
Date posted:
May 15, 2017
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Answers (1)
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Figure 6 shows two inflated balloons hanging vertically on light threads.
(Solved)
Figure 6 shows two inflated balloons hanging vertically on light threads.
When a stream of air is blown in the space between the balloons, they are observed to move towards each other. Explain this observation
Date posted:
May 15, 2017
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Answers (1)
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Figure 6 shows a sheet of paper rolled into a tube
(Solved)
Figure 6 shows a sheet of paper rolled into a tube
When a fast stream of air is blown into the tube as shown in the diagram the paper tube collapses. Explain the observation.
Date posted:
May 15, 2017
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Answers (1)