Each escalator has one motor with an average power of 4000 W. The motor is turned on for an average of 8 hours
each day, 6 days each week. Electricity costs 15 pence
per kilowatt-hour.

Calculate the cost of the electricity used in an average
week to run one escalator.​

True will be your answer dude

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.

The scientific method is1)make an observation. scientists are naturally curious about the world. 2)form a question. after making an interesting observation, a scientific mind itches to find out more about it. .3).form a hypothesis. 4)conduct an experiment. 5)analyse the data and draw a conclusion.