2009 - JAMB Physics Past Questions and Answers - page 4
[g = 10 ms-2]
coefficient of friction = (F)/R = (F)/ mg = (500)/80 x 10
= 0.625
Users' Answers & CommentsII. Acceleration due to gravity.
III. Type of container of the liquid.
IV. The constituents of the liquid.
which of the above conditions will NOT affect the pressure of fluid?
pressure in fluid is given by P = hlg.
∴ fluid pressure depends on height of liquid column, h, density of liquid p and acceleration of free fall 8. it is therefore independent of type of container and constituents of the liquid
Users' Answers & CommentsWork done on a stretched cord
= Average force x extension
= (10 + 0)/2 x 1.2 x 10-2
= 6.0 x 10-2J
Users' Answers & CommentsWeight of glycerine displaced = weight of water dispalced
Mgh glycerine = Mgh water
Pvgh glycerine = Pvgh water
0.4V P glycerine = (0.5v)/v.4v P water = 1.25
(Polycerine)/p water =
But density of substance = relative density x density of water = 1. 25 x 1000kgm3 = 1250kgm-3
Users' Answers & CommentsA pyrometer is instrument for measuring high temperature.
The optical pyrometer is one in which the luminous radiation from the hot body is compared with that from a known source.
Users' Answers & CommentsAnomalous expansion of water is at temperature ranges 0°c to 4°c u. water contract when heated from 0°c to 4°c. thus the volume of water is least at 4°c
Users' Answers & Comments[specific heat capacity of water = 4200 jkg-1 K-1]
Energy supplied bythe heater = heater gained by water
pt = MCAθ
1000 x 300 = m x 4200(100 - 30)
m = (1000 x 300)/4200 x 70 = 1.02 kg
Users' Answers & CommentsLiquid boils when its sup. is equal to the atmospheric pressure.
Users' Answers & Comments[Special latent heat of Vaporization of water = 2.3 x 106 Jkg-1]
Heat supplied = Heat gained
pt = ml
T = (ml)/p = (2 x 2.3 x 106)/1000 = 4.6 x 103 sec
Users' Answers & Comments