3. An experiment was carried out to investigate the relationship between a force acting on a body of a constant mass and its acceleration. The results are recorded in the table shown below.
Force (N) 0.5 1.0 1.25 1.5 2.0
Acceleration (m/s2)
((m/s2 0.5 1.5 2.0 2.5 3.5
a. Plot a graph of force against acceleration
b. State the equation relating force, mass and acceleration,
c. From the graph, find the force applied to a body when the acceleration Is 0 m/s2. Explain why it was necessary to apply this force.
4. A crate of mass 300kg is raised by an electric motor through a height of 60m in 45s. Assuming g=10m/s2. Calculate:
a. the weight of the crate.
b. the work done by the motor.
c. the useful power of the motor.
5. Why does a mercury-in-glass thermometer have
a. a narrow capillary tube?
b. A bulb of very thin glass?
c. Give two advantage of a thermocouple thermometer compared with a mercury thermometer for measuring temperature.
6. Figure 1 shows a vertical object and the image of that object as formed by a converging lens.
'Figure 1 (https://knowledgebase.centreforelites.com/physics-pastpaper-2000-paper-2-by-ecz/)
a. Give one description of the Image.
b. Determine the focal length of the lens.
c. Figure 2 shows the same object of the lens.
On the diagram, draw ray paths to enable you to determine the position and size of the new image.
Measure the distance of this image from the lens and size of the image.
1. (a). Define density of a substance.
(b) Describe an experiment to de ermine density of an irregular object which floats on water.
(c) A Tin containing 5000cm3 of paint has a mass of 7.0kg. If the mass of an empty tin is 0.5kg. calculate
i. the mass of paint
ii. density of paint
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