Mail .\'1? 9:39 PM instructure-uploads.s3.amazonaws.com Test GSCI110-P-2018 37 A

Question

Mail .'1? 9:39 PM instructure-uploads.s3.amazonaws.com Test GSCI110-P-2018 37 An electric lift can raise a 1000 Kg mass a distance of 10 m in 5 seconds What is the power of the lift in Watts 38. Regarding the Spring Potential Energy. Perform a dimensional analysis to show the unit of the spring constant k 39. Regarding the Spring Potential Energy Providedk-10 (in S.1) units. Calculate the Spring Potential Energy when you stretch the spring by 0.1m 5 of 12 Test GSCII 10-P-2018 40. Please name the three fossill fuels we mentioned in class

Explanation / Answer

(37) Power = work done/ time
Work done = mgh = 1000*9.81*10 = 9.81*104 J
Where h is height by which mass is raised , g is acceleration due to gravity
Power = 9.81*104 /5 = 19620 Watts
(38) We know that the spring potential energy is given by
Potential energy = (1/2)KX2
where X is length of compression or stretching
putting dimension of all quantities
(Potential energy)J = (1/2)K *X2(m2)
K (Unit) = J/m2 = (Nm) /m2 = N/m
Therefore the unit of spring constant = N/m
(39) k = 10 (N/m)
x = 0.1 m
Potential energy = (1/2)*10*(0.1)2 = 0.05 J
(40) Fossil fuels are
Coal
Oil and
natural gas

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