Question One
(a) What is resonance? Give any two examples of resonance.
(b) Define the followi...
Physics, 20.06.2020 22:57 Mrlittlefish
Question One
(a) What is resonance? Give any two examples of resonance.
(b) Define the following terms as they relate to sound (i) Pitch (ii) Intensity and (iii) Loudness
(c) Calculate the frequency of the 3rd normal mode of a guitar string of length 40.0cm and mass
0.5g when stretched with a tension of 80N.
Question Two
(a) An eighteen gauge copper wire has a nominal diameter of 1.02mm. This wire carries a
constant cuirent of 1.67A to a 200w lamp. The density of free electrons is 8.5 x 1028 electrons
per cubic metre. Find the magnitude of:
i.
The cuirent density
The drift velocity
ii.
I
(b) A 1800w toaster, a 1.3KW electric frying pan, and a 100w lamp are plugged to the same
20A. 120V circuit.
i.
What current is drawn by each device and what is the resistance of each device?
State whether this combination will blow the fuse or not.
Answers: 2
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At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.
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Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block
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