A rectangular marble block has dimensions 1m by 1m by 5m and weighs 125000N. The marble block is stored with the long side resting on the ground, as in diagram 1. diagram 1 diagram 2 What is the change in the pressure on the ground due to the block when the block is stored as in diagram 2 rather than diagram 17 A a decrease of 25000 Pa B an increase of 100 000 Pa C an increase of 125000 Pa D no change

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A rectangular marble block has dimensions 1m by 1m by 5m and weighs 125000N.
The marble block is stored with the long side resting on the ground, as in diagram 1.
diagram 1
diagram 2
What is the change in the pressure on the ground due to the block when the block is stored as in
diagram 2 rather than diagram 1?
A a decrease of 25000 Pa
B an increase of 100 000 Pa
C an increase of 125 000 Pa
D no change
A O
D
نقطة واحدة
The arrows show an outline of the processes in an oil-fired power station.
oil is burnt turns turbine turns generator → output transformer
What are the processes for the transfer of energy between the turbine and the generator and
between the generator and the output transformer?
turbine to generator
generator to output transformer
A
electrical working
electrical working
mechanical working
electrical working
mechanical working
transfer
thermal energy
D
transfer of thermal energy
mechanical working
A
Transcribed Image Text:A rectangular marble block has dimensions 1m by 1m by 5m and weighs 125000N. The marble block is stored with the long side resting on the ground, as in diagram 1. diagram 1 diagram 2 What is the change in the pressure on the ground due to the block when the block is stored as in diagram 2 rather than diagram 1? A a decrease of 25000 Pa B an increase of 100 000 Pa C an increase of 125 000 Pa D no change A O D نقطة واحدة The arrows show an outline of the processes in an oil-fired power station. oil is burnt turns turbine turns generator → output transformer What are the processes for the transfer of energy between the turbine and the generator and between the generator and the output transformer? turbine to generator generator to output transformer A electrical working electrical working mechanical working electrical working mechanical working transfer thermal energy D transfer of thermal energy mechanical working A
A ball of mass 2.0kg is travelling at a speed of 12m/s. It moves towards an object of mass 3.0kg
which is at rest.
12m/s
3.0kg
at rest
2.0kg
The ball hits the object and sticks to it.
Which row gives the total momentum, and the speed of both objects immediately after the
collision?
total momentum
kgm/s
speed
m/s
4.8
B
8.0
24
4.8
24
8.0
A O
B O
c O
D O
نقطة واحدة
The diagram shows the energy used by a modern lamp.
60W input of
electrical power
48 W of power
wasted in heating
surroundings
12W of
useful power
output as light
Which expression gives the efficiency of the lamp?
12
12
x 100%
48
48
x 100% D
60
48
x 100% B
x 100%
12
A
60
A O
BO A
Transcribed Image Text:A ball of mass 2.0kg is travelling at a speed of 12m/s. It moves towards an object of mass 3.0kg which is at rest. 12m/s 3.0kg at rest 2.0kg The ball hits the object and sticks to it. Which row gives the total momentum, and the speed of both objects immediately after the collision? total momentum kgm/s speed m/s 4.8 B 8.0 24 4.8 24 8.0 A O B O c O D O نقطة واحدة The diagram shows the energy used by a modern lamp. 60W input of electrical power 48 W of power wasted in heating surroundings 12W of useful power output as light Which expression gives the efficiency of the lamp? 12 12 x 100% 48 48 x 100% D 60 48 x 100% B x 100% 12 A 60 A O BO A
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