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1. In 1-2 sentences explain how to calculate the efficiency of a toaster?

2. A student uses a pulley to lift a log in 1- 2 sentences explain how she can calculate the pulleys efficiency?
3. In 1-2 sentences describe an efficient simple machine

1 answer

  1. To calculate the efficiency of a toaster, divide the useful output energy (the heat energy used to toast the bread) by the total input energy (the electrical energy consumed), and then multiply by 100 to express it as a percentage. The formula is: Efficiency (%) = (Useful Output Energy / Input Energy) x 100.

  2. To calculate the efficiency of the pulley, the student should measure the work output (the gravitational potential energy gained by the log) and the work input (the energy used to lift the log), and then use the formula: Efficiency (%) = (Work Output / Work Input) x 100.

  3. An efficient simple machine, like a lever, allows a small input force to lift a heavier load by maximizing the distance over which the input force is applied, resulting in a greater output force with less energy lost to friction and other resistances.