4. If we use plus and minus signs to indicate the directions of velocity and acceleration in one dimension, in which of the following situations does the object speed up?

a.
negative velocity and negative acceleration

b.
positive velocity and negative acceleration

c.
positive velocity and zero acceleration

d.
negative velocity and positive acceleration

e.
none of a, b, c, and d


QUESTION 2

Define:



1. An Ideal Fluid  



2. gauge pressure

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10 points  

QUESTION 3

A car is driven 40 km east and 30 km north. the car finally drives 50 km NE

True

False

2 points  

QUESTION 4

kettle K takes twice as long to boil the same amount of water as does kettle M. If M uses 400 kJ of energy to do the job, kettle K needs in kJ:

a.
200

b.
400

c.
800

d.
1600

e.
None of a, b, c and d


1 points  

QUESTION 5

Two vectors of equal magnitude are added together. the magnitude of their resultant is 10. If one of the vectors is directed due north, and the other bone is at 20° north of eat, determine the common magnitude of two vectors as well as the direction of their resultant.

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QUESTION 6

if three vectors with magnitude 30, 40, 50 are added together, which of the following cannot represent the magnitude of the resultant?

a.
0

b.
30

c.
50

d.
150

e.
None of a, b, c and d

1 points  

QUESTION 7

Cool drink enters the mouth through a drinkng straw when the drinker sucks because

a.
the straw acts as a capilary tube

b.
the drink is pushed by atmospheric pressure

c.
the drink is drawn up by an upward sucking force

d.
trhe foces of cohesion are reduced by the low sucking pressure

e.
none of a, b, c and d

1 points  

QUESTION 8

Object A of mass 4 kg moves south at 9 m/s and collides had-on with object B of mass 8 kg moving north at 12 m/s. After the collision, A moves north at 7 m/s. Calculate the magnitude and direction of the velocity of B after collision

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QUESTION 9

when a object is
in a fluid, it experiences an
equal to the
of the fluid
10 points  

QUESTION 10

which of the following arrangement provides an effective resistance of 10 Ω?



A.
A

B.
B

C.
C

D.
D

E.
None of A, B, C and D


1 points  

QUESTION 11

An electroplating process supplies a coating thickness of 800 nm. Calculate the area which would be covered using 1 kg of gold, mindful that the density of gold is 19300 kg/m3                     [4]

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QUESTION 12

How long will it take will it take a 1500 kW motor to lift a 400 kg piano to a sixt-storey window 20 m above the ground?

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QUESTION 13

A fish rests on the bottom of a bucket of water while the bucket is being weighed on a scale. When the fish begins to swim around, the scale reading changes

True

False

2 points  

QUESTION 14

A total force of 500 N is applied to pull a box on a rough surface along a distance of 60 m. If 1000J of work are done against friction, the total kinetic energy of the box at the end of the trip is:



a.
3000J

b.
20000J

c.
29000J

d.
59000J

e.
None of a, b, c and d


1 points  

QUESTION 15

200 kilolitres of water was consumed inour house last month. this quantity of water corresponds to:

a.
20000 litres

b.
200 m3

c.
0.2 m3

d.
200000 mm3

e.
None of a, b, c and d

1 points  

QUESTION 16

A 60 g tennis ball lands on the racket of a player with the speed of 108 km/h, and the player returns the ball with a speed of 90 km/h. the ball has been in contact during 0.2 s with the racket of the player. Determine:
The change in momentum during the return of the ball (3 marks)
The average force deployed by the player to return the ball (2 marks)