# Download CSET 123-127 physics : teacher certification exam (Second by by Sharon Wynne. PDF

By by Sharon Wynne.

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Example text

Thus, this is a mathematical statement that when potential energy is maximal, kinetic energy is minimum. Further, kinetic energy plus potential energy is always equal to a constant, that is, total energy in the system is always conserved. The preceeding example was one involving elastic potential energy, but there are others involving other types of potenial energy. For example, chemical potential energy is converted to kinetic energy in the combustion reactions that move the pistons in modern engines.

A temperature vs. heat graph can demonstrate these relationships visually. One can also calculate the specific heat or latent heat of phase change for the material by studying the details of the graph. Example: The plot below shows heat applied to 1g of ice at -40C. The horizontal parts of the graph show the phase changes where the material absorbs heat but stays at the same temperature. The graph shows that ice melts into water at 0C and the water undergoes a further phase change into steam at 100C.

The sign exerts a downward force of 490 N. Therefore, the cable pulls upwards with a force of 490 N. It does so at an angle of 30 degrees. To find the total tension in the cable: F total = 490 N / sin 30° F total =980 N 30 A B 30 30 Problem: A block is held in static equilibrium by two cables. Suppose the tension in cables A and B are measured to be 50 Newtons each. The angle formed by each cable with the horizontal is 30 degrees. Calculate the weight of the block. Solution: We know that the upward pull of the cable must balance the downward force of the weight of the block and the right pulling forces must balance the left pulling forces.