Question 1
State two conditions necessary for a rigid body to be in equilibrium
Answer
The sum of clockwise moments is equal to the sum of anticlockwise moments
Question 2
An empty density bottle has a mass of 23.5g. When completely filled with water its mass is 39.0g. What will be its mass if it is completely filled with an acid of relative density 1.25? (Take the density of water to be 1.0gcm-3)
Answer
Question 3
(a) Define the term elastic limit of a material.
(b) Two springs of negligible weight and of spring constants 100Nm--1- respectively are connected end to end and suspended from a fixed point. Determine;
(i) The total extension when a mass of 7.5 kg is hung from the lower end.
(ii) The force constant of the combination of springs
Answer
(a) This is the greatest force on the material at which hooks law is obeyed force and extension are proportional.
(b)
(b)
Question 4
Equal amount of hot water at 78°C is poured into vessels P and Q as shown below and left to cool up to room temperature. P is painted black and Q is polished.
The readings of temperature are taken at intervals of five minutes. On the same axes sketch the graph of temperature against time
Answer
Question 5
During a P.E lesson students loosely tied a rope to a goal post and arranged themselves at points A, B, C and D along the rope as shown below.
The students then went round the goal post holding the rope in their hands and ensuring that it remained tight and straight. State and explain the observations made by the students in respect to their relative speeds
Answer
Student D runs fastest than students C, B and with student A having the least speed.
Centripetal force is dependant on radius.