**UNIVERSITY EXAMINATIONS: 2021/2022**

**ORDINARY EXAMINATION FOR THE CERTIFICATE IN INFORMATION **

**TECHNOLOGY **

**CIT 102: FOUNDATION PHYSICS AND ELECTRICITY FOR IT**

**DATE: NOVEMBER, 2021 TIME: 2 HOURS **

**INSTRUCTIONS: Answer Question One and Any Other Two Questions**

**QUESTION 1 [COMPULSORY]**

a) Define the following terms as used in physics

i) Potential energy

ii) Mathematical relation

iii) Vector [6Marks]

b) Differentiate between liquid and solid as state of matter [4Marks]

c) State the SI units for the following

i) Voltage

ii) Power

iii) Work [3Marks]

d) Differentiate between the following electricity concepts

i) Protons and electrons [2Marks]

ii) Conductors and insulators [2Marks]

e) A golfer drives a 0.10 kg ball from an elevated tee, giving the ball an initial horizontal speed of 40m/s.

The club and the ball are in contact for 1.0 ms. What is the average force exerted by the club on the ball

during this time? [3Marks]

**QUESTION 2**

a) Explain four phenomena that describe the behavior of waves [4Marks]

b) Hellen and Victor stand 8 meters apart and demonstrate the motion of a transverse wave. The wave can

be described as having a vertical distance of 44 cm from a trough to a crest, a frequency of 3.8 Hz, and a

horizontal distance of 52 cm from a crest to the nearest trough. Determine the following properties of the

wave.

i) The amplitude

ii) Period

iii) Wavelength. [6Marks]

c) A drag racer starting from rest accelerates in a straight line at a constant rate of 5.5m/s2

for 6s.

i) What is the racer’s velocity at the end of this time? [2Marks]

ii) If a parachute deployed at this time causes the racer to slow down uniformly at the rate of

2.4m/s2, how long will it take the racer to come to a stop?

[3Marks]

**QUESTION 3**

a) State ohms law [2Marks]

b) An electronic circuit comprises of two resistors of 4Ω and 6Ω connected in parallel. The parallel

combination is then connected to a 5 Ω resistor in series. The complete resistive network is connected

across an 8Vd.c power source. Calculate

i) The total circuit resistance [3Marks]

ii) The current from the d.c power source [2Marks]

iii) The potential drop across the 6 Ω resistor [3Marks]

c) Define motion and state its four characteristics [5Marks]

**QUESTION 4**

a) Estimate the magnitude of the mutual gravitational force between the earth and the moon. (Assume that

the earth and the moon are homogeneous spheres.) Use the following data: mass of the earth is 6.0 x

1024 kg, mass of the moon is 7.4 x 1022 kg and the distance between them is 3.8 x 108m.

[4Marks]

b) Briefly describe the following forces when used in physics

i) Applied Force

ii) Frictional Force

iii) Normal Force [6Marks]

c) Define the term kinetic energy and explain any two types of kinetic energy [5Marks]