1. (a)What is n dimensionless quantity? (b)The frictional force,f between a box ofmass.m and a...

1.
(a)What is n dimensionless quantity?
(b)The frictional force,f between a box ofmass.m and a table is given by
f=umg.
where g is the acceleration due to gravity.Show that the coefficient of frictionμ is dimensionless.
日
2.(a)Define spring constant, k of a spring.
(b)A helical spring is stretched by an amount,under a constant force,F.Show3that the energy stored in the spring depends only on k and e.
3.
(a)What is a laser?
(b)State two uses of a laser beam.
ria
4.State one application of a magnet in each of the following areas of activity:
(a)Exploration and Navigation;
(b)Industry and Constructional sites;
(c)Medical.
ria
[3
5.Draw a section of the structure of a fibre optics cable showing:
(a)the core;
(b)the cladding;
(c)signal transmission through it.

3
What is a parking orbin?6.(a)
(b)State the uses of a geostationary sstelice,
7.A missile aimed at a target on a wall12.5and state whether or not the target wil be hit when the atigle of projection i 40°.
[g=10m5]
DAMFES
SIR
[45 marks]
Answer three questions from this part.
All questions carry equul marks
8.(a)Explain the term moment of forces.
(b)A uniform metal tube of length 10 m and mass 100 kg is suspended horizontailyof the tube.Find the tension in each of the cords.[g=10ms[g=10ms-]
5(c)
With the aid of a diagram explain two types of equilibrium.①
(ii)State two examples of couple.
(p)
A uniform cylindrical object with height 0.8 m and base diameter 0.4 m is placedit is just enough to make the object topple,calculate the value of 0.
9.
(a)Explain the statement te linear expansivity of a body is 3.0 x10-" K
(b)Expiain why power lines are always connected in sag.
(c)An iron tyre of diameter 60 cm,at 20℃ is to be shrunk onto a wheel ofdiameter 60.45 cm.If the tyre is to be heated to a temperature T so as toslip over the wheel,calculate T.[Linear expansivity ofof iron=1.2x10^-5K-
State two merits each of:
(i)Thermoelectric thermometer,
(ii)Constant volume gas thermometer.

10.
(a)
(1)Distinguish between pole and center4curvature of a spherial mim10
ria
(ii)Describe how the approximate focallength of a concave mirror couldbe determined.
(b)e e e10 cm forms a magnified image on a screen
(c)bali mo dl eau lianoioae-aeort mrndlinn lo loztoy sgo monod sth uiogz Adisplaced by 2 cm when viewed2avertically at the top.Calculate the refractive index of the alcohol.
(d)its string is tightened.IR
ria
11.
(a)State two factors that determines the sensitivity of a movig-coil galvanometer.
(b)
(i)
A bulb is connected to a source of electricity. State two cffects of addinmore bulbs in series with the first one.
(ii)
galvanometer to 0.05 A of its initial value by means of a resistor. If the
(α)Draw the circuit diagram for the arrangement;(β)
(c)Explain why a voltmeter is always connected across a load.
The figure below is a circuit diagram. Calculate the reading on thevoltmeter of the 400 Ω resistor.
111
200Ω
400Ω
200Ω?

In Physics
1 Answers Available
Asked by AMADU on 20th May, 2024