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...public address systems when the volume is too high and the microphone picks up sound from the loudspeaker. Here, at one particular frequency, there is an exact phase shift of 360 degrees between the microphone and sounds returning to the microphone from the loudspeaker. There is thus reinforcement, and under the right conditions a sine wave with a continually growing...

...Health & Social Care How many full-time enrolments did Hair & Beauty have? Answer 49. Note how the scale goes up in 2s and the full-time component of the Hair & Beauty bar goes up to halfway between 48 and 50. How many part-time enrolments did Business Admin have? Answer 7 Approximately how many course enrolments were there in total? Answer 197 – You need to count the...

...publication forms part of an Open University course S282 Astronomy. This course has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology under contract with the National Aeronautics and Space Administration. The content acknowledged below is Proprietary (see terms and conditions)....

...public did have a say in the official names. [Described image] Figure 61 A screen grab of the BBC News website on 2 July 2013 in which Pluto’s moons make the news. See also: BBC News - Pluto moons get mythical new names. The recently discovered fourth and fifth moons of Pluto now have official names: Kerberos and Styx...Week 3: Looking closer: 3.9 The New Horizons...