2011 - JAMB Physics Past Questions and Answers - page 1

The resultant force acting on the man is given by w = mg - R

Mg - mg = 0

The man feels weightless because the reaction, R is equal to the weight mg

v² = U² - 2G s

0 = 100² - 2 x 10 x s = 10000 - 20s

s = (10000)/20 = 500m

Which is independent of mass.the two bodies where acted upon by the same retarding force of gravity which is independent of mass of the body; therefore both will be 500 m from the point of throw.

S = (1)/2gt²

S = (1)/2 x (10)/1 x 3² =5 x 9 = 45 m

Centripetal force,

F = ( \frac{mv^2}{r} )

= ( \frac{2 \times 10^2}{4} )

= ( \frac{200}{4} )= 50N

K e just before hitting the gound

= P e at the maximum height (conservation of mechanical energy)

K e = P e = mgh = 1.5 x 10 x 20

= 300 J

The liquid will rise up the capillary if it wets glass and falls below its wets glass and falls below its initial level if it does not wet glass

upthrust = weight in air - weight in liquid = 30 x 10 - 22 x 10 = 300 - 220 = 80 N

Correct Answer: Option E

        increase in volume, DV = RV<sub>1</sub> ∆ θ = 3α Vsub&gt;1

Young modules = ( \frac{\text{Tensile stress}}{\text{Tensile strain}})

= ( 1.1 \times 10^11 = \frac{7.7 \times 10^7}{\text{Tensile Strain}} )

∴ Tensile strain = ( \frac{7.7 \times 10^7}{1.1 \times 10^11} )

= ( 7.0 \times 10^{7-11}

= 7.0 \times 10^{-4} )

A good thermometric liquid should not have a high thermal capacity so that the themperetue of the body being measured will not be affected

∴ II, III and IV are qualities of a good thermometer