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8 questions matched your search criteria.
 

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One of these devices is positioned exactly 5 m from the opposite wall.  Calculate the time that will           elapse             between the signal being sent and the reflected signal being received.

19 October 2011 · Leigh Kleynhans · 3 marks · 1 mins

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Calculate the wavelength of the waves being generated by the device.

19 October 2011 · Leigh Kleynhans · 4 marks · 2 mins

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Why would a burglar, standing in the room, not be aware of the sound produced by the motion    sensor ?

19 October 2011 · Leigh Kleynhans · 2 marks · 1 mins

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How would the frequency change if a wave is reflected off a person walking towards the

device?

19 October 2011 · Leigh Kleynhans · 1 marks · 1 mins

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Calculate the frequency detected if a burglar is moving towards the device at a speed of 3m.s-1.

19 October 2011 · Leigh Kleynhans · 3 marks · 2 mins

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Calculate the velocity (magnitude and direction) of the burglar if the detected wave has a
frequency of 29 500 Hz.

19 October 2011 · Leigh Kleynhans · 4 marks · 2 mins

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Draw a labeled force diagram indicating the names of the forces Q, R, S and T acting on the car as it is hauled up the ramp as shown in the Fig B.

19 October 2011 · Karen Trenor · 4 marks · 2 mins

Give the name of the process of breaking down a substance using electrical energy.

19 October 2011 · Pippa Mercier · 1 marks · 1 mins