SECTION A
 M. S = 8.00
T.S = 0.30
= 8.30mm (Unit a must)
 Tube A–because air molecules move faster than water molecules

 Upthrust
 Frictional force
 Let the point be x cm from pivot to the left side
Clockwise movement = anticlockwise moment
(x × 1) + 0.12(50 + x) = (50 – x) 0.18
x + 6 + 0.12x = 9 – 0.18x
1.3x = 3
x = 2.307cm
Answer = 50 – 2.307 = 47.69 cm (4 sf)

 To prevent skidding or overturning of vehicles at high speed.
 P = ^{Fd}/_{t }
=80×10×10×0.2
= 320W
 When fire breaks mercury is heated. It expands and makes contact with terminal T, thereby completing the circuit and the bell rings.
 k = ^{F}/_{e} or series k =^{ W}/_{4}÷2
=(^{W}/_{8}) mm
Total extension = ^{F}/_{k}
e = (^{w}/_{w/s)}= 8mm

 To remove air from the bottle
 Pressure imbalance on the inside and outside causes the higher atmospheric pressure on the outside
 The water drives air out of the bottle. On cooling, the steam inside condenses creating a region of low pressure inside. The higher atmospheric pressure deforms the bottle.
 Rate of change of angular displacement with time.
 Make building stable by lowering the centre of gravity
 Pressure is inversely proportional to the speed or speed increases as pressure decreased
SECTION B


 P.E = mgh
= 2 x 10 x 0.15
= 3J 
 P.E = mgh

 M_{1}V_{1} + M_{2}V_{2} = (M_{1} + M_{2})V
1 x 1 + 2 x 0 = (1 + 2)V
1 = 3V
V = 0.3333 ms^{1}  K.E = ½ mv^{2}
= ½ x 3 x 0.33332
= 0.495J 
 M_{1}V_{1} + M_{2}V_{2} = (M_{1} + M_{2})V
 Velocity reduces to zero then increases to maximum value. The body is thrown upwards and coming back where it was released from.


 Bodies in circular motion change the direction at different instant implying a change of velocity thus accelerates

 V = rw
w =^{v}/_{r}v =^{2}/_{2} = 1ms^{1}
w =^{1}/_{5} rads^{1}  w =^{ 2πf}/_{T}, f=^{w}/_{2π }T=^{2π }/_{w}=^{2π }/_{0.2}= 31.42 seconds
 V = rw
 T = mg + mrw^{2}
= 0.04 x 10 + 0.04 x 0.5 x (0.2)^{2}
= 0.4 + 0.0008N
= 0.4008N  As the clothes rotates in the spin driver, the fibre of the clothes cannotü1 provide sufficient centripetal force for the most of the water to make it go round in a circle. The water tends to fly off at a tangent to the circle and so move towards the wall where it gets out through the holes

 Mass
 Velocity
 Radius (Any 2 correct)

 C is the quantity of heat required to change any mass of substance by 1^{o}C or 1k. Whole s.h.c in the heat required to change a unit mass of substance by 1k.

 Time, temperature rise, current (I) and p.d (V), mass of liquid, mass of calorimeter and its contents (Any 4 correct (2 marks
 After t seconds, the new temperature is noted from the initial temperature of liquid.
Corresponding I and p.d should beü1 With the other variables the specific heat capacity in obtained from  Ensure continuous stirring of the liquid.
 pt = 0.4 x 900 x 10 + 1 x4200 x 10
2000t = 3600 + 42000
t =^{45600}/_{2000}= 22.8 seconds
 Product of force and distance moved by an object.
SI unit – Joule or NM W = mgh
= 500 x 10 x 4
= 20000J  P = ^{w}/_{t}=^{20000}/_{8}= 2,500w
 ^{power output}/_{power input}x100%
=^{2500}/_{2800}×100
= 89.29%  Friction of the moving parts
Work done in lifting the parts of the machine
 W = mgh


 L = 3.0cm
 Gradient = ^{8.54.5}/_{0.850.25}
=^{4}/_{0.6}
=6.667 cm/N  ^{1}/_{slope}= ^{1}/_{6.667}=0.15 N/cm or 15 N/m
 w = w_{air}  u
= 25 – 14
= 13N  Weight of stone aloneü1 is greater than upthrust, however stone and wood have smaller weight than upthrust

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