B: -39 357
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A bimetallic strip made from brass and iron is used as a thermostat. When the strip is heated, the brass expands more…
According to the kinetic theory, matter is made up of very small particles in a constant state of motion. Which row b…
A balloon filled with air is gently heated. What happens to the mass and the density of the air inside the balloon?
When dealing with radioactive materials there are possible dangers. Which statement is correct?
An isotope X is radioactive and has a half-life of 4 years. A sample initially contains 8000 atoms of X. After how ma…
Forces of 3 N and 4 N act as shown in the diagram. Which diagram shows the resultant R of these two forces?