Mechanical locks can accept a variety of inputs as keys, including magnetic strips on ID cards, radio signals from name badges,
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Answer:
18.3 m , 25.4°
Explanation:
d1 = 6 m, θ1 = 40°
d2 = 8 m, θ2 = 30°
d3 = 5 m, θ3 = 0°
Write the displacements in the vector form
The total displacement is given by
magnitude of resultant displacement is given by
d = 18.3 m
Let θ be the angle of resultant displacement with + x axis
θ = 25.4°
The efficiency of the device is 30 %
Explanation:
The efficiency of a heat engine is given by:
where
W is the work done by the engine
is the heat in input to the engine
For the device in this problem, we have:
W = 120 J is the work done
is the heat in input
Substituting, we find the efficiency:
which corresponds to an efficiency of 30%.
Learn more about work:
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The answer would be 49. Check the attach file for solution.
