Question 1
Figure 1 shows a vernier caliper being used to measure the diameter of a cylindrical metal of mass 18g and length 20cm. The reading on the calliper when the jaws were fully closed without the metal was -0.11cm. Use this information and the figure to answer questions 1 and 2.
What is the diameter of the cylindrical metal?
Answer
V.S.R = 0.25cm
Diameter of the metal = (0.25 + 0.11)cm = 0.36cm
Diameter of the metal = (0.25 + 0.11)cm = 0.36cm
Question 2
Determine the density of the cylindrical metal
Answer
Question 3
Figure 2(a) shows a table tennis ball hanging close to a water tap. When the tap is opened so that the water flows, the ball is attracted to the stream as shown in figure 2(b)
Explain this observation.
Answer
When the tap is opened, the water flows leading to an increase in the air velocity near the water stream and hence a decrease in pressure in that region. A resultant force directed towards the stream pushes the table tennis ball to the water
Question 4
Figure 3 shows a spiral spring fixed on a bench vertically. A mass of 0.5kg is placed on top as shown in the figure below.
In (a) the height, ho, of the spring is 6cm while in (b) the height is 4cm. find the energy stored in the spring in figure 3(b)
Answer
Energy stored by the spring = ½ Fe
= ½ x 0.5 x 10 x 0.02
= 0.05 joules
= ½ x 0.5 x 10 x 0.02
= 0.05 joules
Question 5
- State the Pascals principle.
- If the cross-sectional area of the output piston in a hydraulic device is ten times that of the imput pistons area, by how much will the device multiply the input force
Answer
- Pressure applied to an enclosed fluid is transmitted undiminished to every point in the fluid and to the walls of the container.
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