When the can is heated, air molecules are expelled from the can. When sealed, the steam pressure balances the atmospheric pressure. On cooling the steam condenses creating partial vaccuum on the inside. The higher atmospheric pressure on the outside makes the can collapse
johnmulu answered the question on April 13, 2017 at 09:22
- Figure 3 shows the levels of two liquids A and B after some air has been sucked out of the tubes through the tap. Use...(Solved)
Figure 3 shows the levels of two liquids A and B after some air has been sucked out of the tubes through the tap. Use this information and the figure to answer questions
State the reason for the rise in the levels of the liquids when air is sucked from the tubes
Date posted: April 13, 2017. Answers (1)
- Figure 2 (a) and 2 (b) shows capillary tubes inserted in water and mercury respectively
(Solved)
Figure 2 (a) and 2 (b) shows capillary tubes inserted in water and mercury respectively
It is observed that in the water the meniscus in the capillary tube is higher than the meniscus in the beaker, while in mercury the meniscus in the capillary tube is lower than the meniscus in the beaker. Explain these observations.
Date posted: April 13, 2017. Answers (1)
- Figure 6 (a) and 6 (b) shows capillary tubes inserted in water and mercury respectively(Solved)
Figure 6 (a) and 6 (b) shows capillary tubes inserted in water and mercury respectively
It is observed that in water the meniscus in the capillary tube is higher than the meniscus in the beaker. While in mercury the meniscus in the capillary tube is lower than the meniscus in the beaker. Explain these observations
Date posted: April 13, 2017. Answers (1)
- Figure 6 shows a small toy boat floating on water in a basin. X and Y are two points near the toy.(Solved)
Figure 6 shows a small toy boat floating on water in a basin. X and Y are two points near the toy.
When a hot metal rod is dipped into the water at point X, the toy is observed to move towards Y. Explain this observation
Date posted: April 13, 2017. Answers (1)
- Figure 8 shows water drops on two surfaces. In figure 8 (a) the glass surface is smeared with wax while in figure 8 (b) the...(Solved)
Figure 8 shows water drops on two surfaces. In figure 8 (a) the glass surface is smeared with wax while in figure 8 (b) the glass surface is clean.
Explain the difference in the shapes of the drops
Date posted: April 13, 2017. Answers (1)
- Figure 4 shows a capillary tube placed in through mercury.(Solved)
Figure 4 shows a capillary tube placed in through mercury.
Give a reason why the level of mercury in the capillary tube is lower than in the beaker
Date posted: April 13, 2017. Answers (1)
- The diagram in Fig. 4 shows two glass tubes of different diameters dipped in water
(Solved)
The diagram in Fig. 4 shows two glass tubes of different diameters dipped in water
Explain why h2 is greater than h1
Date posted: April 13, 2017. Answers (1)
- Figure 2 (a) shows the initial reading of burette used to measure the volume of oil. After 50 drops of the oil were run out, the final reading was as shown in figure 2 (b)(Solved)
Figure 2 (a) shows the initial reading of burette used to measure the volume of oil. After 50 drops of the oil were run out, the final reading was as shown in figure 2 (b)
Determine the volume of one drop of oil
Date posted: April 13, 2017. Answers (1)
- Figure 1 shows a measuring cylinder containing some water(Solved)
Figure 1 shows a measuring cylinder containing some water
Determine the reading on the measuring cylinder, after three drops of water each of volume 0.6 cm3 are added.
Date posted: April 13, 2017. Answers (1)
- In an experiment to measure the density of a liquid, a student filled a burette with a liquid to the 0 cm 3 mark. Figure 1 shows a section of the burette showing the level of the liquid after 54.5 g of the liquid had been run out(Solved)
In an experiment to measure the density of a liquid, a student filled a burette with a liquid to the 0 cm 3 mark. Figure 1 shows a section of the burette showing the level of the liquid after 54.5 g of the liquid had been run out
Determine the density of the liquid
Date posted: April 13, 2017. Answers (1)
- Figure 1 shows the reading on a burette after 55 drops of a liquid have been used.(Solved)
Figure 1 shows the reading on a burette after 55 drops of a liquid have been used.
If the initial reading was at zero mark, determine the volume of one drop.
Date posted: April 13, 2017. Answers (1)
- Figure 1 shows a burette partly filed with a liquid. The burette was initially full to the mark 0. If the quantity of the liquid removed has a mass of 22 g, determine the density of the liquid(Solved)
Figure 1 shows a burette partly filed with a liquid. The burette was initially full to the mark 0. If the quantity of the liquid removed has a mass of 22 g, determine the density of the liquid
Date posted: April 13, 2017. Answers (1)
- Fig 1 shows a fencing post whose length is being measured using a strip of a measuring tape(Solved)
Fig 1 shows a fencing post whose length is being measured using a strip of a measuring tape
Use this information to answer the questions
a) State the accuracy of the post
b) What is the length of the post?
Date posted: April 13, 2017. Answers (1)
- Fig. 1 shows a measuring cylinder, which contains water initially at level A. A solid of mass 11 g is immersed in the water, the level rises to B.(Solved)
Fig. 1 shows a measuring cylinder, which contains water initially at level A. A solid of mass 11 g is immersed in the water, the level rises to B.
Determine the density of the solid. (Give your answer to 1 decimal point)
Date posted: April 13, 2017. Answers (1)
- What is meant by donor impurity in semiconductors? (Solved)
What is meant by donor impurity in semiconductors?
Date posted: February 22, 2017. Answers (1)
- Describe how a p-type semiconductor is formed.(Solved)
Describe how a p-type semiconductor is formed.
Date posted: February 21, 2017. Answers (1)
- It is observed that alpha particles have a lower penetrating power than beta particles. Explain this observation. (Solved)
It is observed that alpha particles have a lower penetrating power than beta particles. Explain this observation.
Date posted: February 21, 2017. Answers (1)
- Define Radioactivity?(Solved)
What is meant by Radioactivity?
Date posted: February 21, 2017. Answers (1)
- Define half-life of a radioactive material. (Solved)
Define the term half-life of a radioactive material.
Date posted: February 21, 2017. Answers (1)
- A radioactive nuclide of atomic number Z emits a beta particle and gamma rays. State the atomic number of the nuclide.(Solved)
A radioactive nuclide of atomic number Z emits a beta particle and gamma rays. State the atomic number of the nuclide.
Date posted: February 21, 2017. Answers (1)