2014 - JAMB Physics Past Questions and Answers - page 2

\(\frac{MA}{VR}\times\frac{100}{1}=efficiency\)

\(\frac{L}{E}\frac{1}{VR}\times\frac{100}{1}=75\)

\(\frac{1000}{E}\frac{1}{4}\times\frac{100}{1}=75\)

\(E = \frac{250 \times 100}{75}\)

E = 333.3N

VR = 800/200 = 4
\(Efficiency = \frac{MA}{VR} \times \frac{100}{1}\)

\(Efficiency = \frac{L}{E} \times \frac{1}{VR} \times \frac{100}{1}\)

\(Efficiency = \frac{800}{250} \times \frac{1}{4} \times \frac{100}{1}\)

= 78.74%
= 80%

\(Stress = \frac{Force}{Area}\)

\(Stress = \frac{500}{0.2} = 2500\)

= 2.5 x 10³Nm^-3

273 + 20 = 293

if a=0, b=1 and c=-1 then
P⁰V¹T^-1 = V/T (Charles Law)