Download Mechanics and Properties of Matter Revision Questions Multiple

Mechanics and Properties of Matter
Revision Questions
Multiple Choice and Short Answer
Please Note:
These questions come from an earlier
version of the syllabus.
Use g = 10 ms-2.
Some of these questions represent very
difficult problem solving.
Not all areas of the course are covered, for
example there are no questions on
buoyancy.
Answers are at the end.
5.
1.
A boy drops a stone down a dry well. If he
sees the stone strike the bottom after 3
seconds, how deep is the well?
A
B
C
D
E
2.
A mass of 1 kg hangs from a spring balance
which is suspended on the inside of a small
rocket.
15 m
30 m
45 m
60 m
90 m
A trolley is given a sharp push along a rough
horizontal bench. Which distance—time graph
represents its subsequent motion if distance is
measured from the starting-point of the
trolley?
What will the balance read when the rocket is
accelerating upwards from the earth’s surface
at a constant rate of 2 ms-2 ?
A
B
C
D
E
6.
3.
A lunar module package is designed to
withstand an impact of 10 m s-1.
The acceleration due to gravity on the moon is
1/6 of that on the earth.
The heights that the package can be safely
dropped from on the earth and moon are
4.
A parachutist of mass 50 kg descends towards
the Earth at a constant velocity of 2 ms-1. The
upward force acting on him is
A
B
C
D
E
10 N
25N
l00 N
200 N
500 N
Zero
2N
8N
10 N
12 N
A 20 N force acts on a box as shown below.
Which line of the following table correctly
shows the horizontal and vertical components
of the force?
7.
An object moving in a straight line is acted on
by an unbalanced force which decreases
steadily to zero.
Which velocity-time graph represents the
motion of the object?
10.
The force applied to a block on a frictionless
surface varies as shown in the graph.
If the block was initially stationary and then
moves in a straight line, what will be its
kinetic energy after it covers a distance of 4
metres?
A
B
C
D
E
11.
8.
9.
Two trolleys, P and Q, are held on a level
surface as shown below. The trolleys are then
released simultaneously.
30 J
40 J
60 J
70 J
80 J
A steel ball of mass m is released from point
P, and rolls along the curved curtain rail
shown.
Neglecting any effects due to friction, what is
the ratio speed of trolley P: speed of trolley Q
immediately before impact?
Neglecting friction, the kinetic energy of the
ball at point Q is given by
A
B
C
D
E
A
B
C
D
E
1:4
1:2
1:1
2:1
4:1
A projectile moves from P to T along the path
shown.
12.
A
B
C
D
E
point P
point Q point R
point S
point T.
point P
mg √(x2 + y2).
The pressure of a gas can be affected by
factors such as its mass, its density, its
volume, its temperature. Pressure is inversely
proportional to volume if
A
B
C
D
E
If air resistance can not be ignored, the
projectile has maximum kinetic energy at
mgX
mgy
mg(x + y)
mg(y — x)
mass alone is constant
density alone is constant
temperature alone is constant
mass and density are constant
mass and temperature are constant.
13.
A sample of oxygen gas at room temperature
and atmospheric pressure occupies a volume
of 1 X 105 litres.
The temperature and pressure are now altered
until all the gas has been liquefied.
The volume of liquid oxygen produced is
approximately
A
B
C
D
E
14.
1 X 102 litres
1 X 103 litres
1 X 104 litres
1 X 105 litres
1 X 108 litres
15.
A car driver presses the accelerator sharply
when the traffic lights go green. The
unbalanced force on the car varies with time
as shown.
The graphs I to III below attempt to show the
variation with time of
I
II
III
A man weighs 800 N and stands on an
accurate weighing-machine in a lift. The
reading on this weighing-machine is 820 N.
This indicates that the lift is
A
B
C
D
E
the car’s displacement;
the car s speed;
the car’s acceleration.
stationary
moving upwards at a steady speed
moving downwards at a steady speed
accelerating upwards
accelerating downwards.
Which of these graphs is/are correct?
A
B
C
D
E
I only
II only
I and III only
II and III only
I,II and III
16.
A block X of mass 3 kg is accelerated from
rest by a force of 5 N for 2s. An identical
block Y is accelerated from rest by a force of
5 N for 4s. The ratio of the kinetic energy of X
to the kinetic energy of Y after acceleration is
A
B
C
D
E
17.
20.
5:3
3:4
2:1
1:2
1:4.
Assuming that the temperature changes are
negligible, the pressures in atmospheres in
flask Y become respectively
The diagram below shows a block moving
down a 30O slope, at a constant speed. The
weight of the block is 20 N.
21.
From the above information, which entry in
the table is correct?
18.
Flasks X, Y and Z have the same volumes. Y
contains air at a pressure of 6 atmospheres. X
and Z have been evacuated and the taps are
closed. Tap 1 is now opened, followed a short
time later by Tap 2.
The kelvin temperature of a gas varies directly
as
A
B
C
D
E
the average momentum of the molecules
the average inertia of the molecules
the average velocity of the molecules
the average kinetic energy of the molecules
the average potential energy of the molecules.
22.
During an experiment involving a fixed mass
of gas, the kelvin temperature is trebled and
the volume is doubled. Due to these changes,
the pressure is
23.
A car is travelling at 15 ms-1 It accelerates uniformly for 5 s to a speed of 25 ms-1 Calculate
the distance gone by the car during the
acceleration.
24.
A tractor of mass 1000 kg pulls a trailer of
mass 1000 kg along a horizontal road. The
total resistance to motion has a constant value
of 4000 N. One quarter of this resistance acts
on the trailer.
When the acceleration is 2 ms-2, what is the
force exerted on the tractor by the tow-bar?
Two trolleys are travelling in the same direction, as shown below. The trolleys collide.
After impact they move off together. The
amount of kinetic energy lost is
A
B
C
D
E
19.
4J
6J
12 J
14 J
18 J.
The equation s = ut + ½at2 can be derived from
A
B
C
D
E
the area under a velocity—time graph
the area under an acceleration—time graph
the slope of a velocity—time graph
the slope of a displacement—time graph
the slope of an acceleration—time graph.
25.
The graph below shows the force acting on a
body over a period of 6 seconds.
29.
Two trolleys are joined together by a thread
and are pulled along a level bench by a force
of 12 N, as shown.
One second after starting from rest, the thread
breaks at X.
Neglecting possible effects of friction, which
pair of statements correctly describes the
motion of each trolley after the thread breaks?
What is the momentum gained by the body in
this time?
26.
A trolley of mass 1 kg travelling at 3 ms-1 collides with, and remains attached to, a
stationary trolley of mass 2kg. What is the
change in momentum of the 1 kg trolley?
27.
Which one of the following pairs contains one
vector and one scalar quantity?
30.
A
B
C
D
E
28.
displacement; acceleration
power; speed
work; potential energy
force; kinetic energy
momentum; velocity
A wheel nut falls straight down from a
helicopter which is descending vertically at a
constant speed of 5 ms-1. The wheel nut strikes
the ground 5 s later.
Assuming that the effect of air resistance on
the nut is negligible, how far does the nut
drop?
A
B
C
D
E
50 m
55 m
l00 m
125 m
150 m
A block of mass 3 kg is held at rest on a
friction-free surface inclined at 300 to the
horizontal.
Two seconds after the block is released, the
component of the weight (F) acting down the
slope, and the distance (d) travelled are
31.
An inelastic collision takes place between a
moving object and a stationary object of equal
mass.
Which of the following quantities is/are
conserved for this system in this situation?
I
II
III
A
B
C
D
E
32.
I and II only
I and III only
II and III only
III only
I,II and III
The pressure exerted on the table by the
cylinder resting in the position shown is
33.
34.
2 Pa
20 Pa
200 Pa
2000 Pa
20 000 Pa..
Specific heat capacity can be found from the
experimental results given below.
Which one of the following measurements
creates most uncertainty in the calculated
value of the specific heat capacity?
A
B
C
D
E
A girl on a bicycle is cycling at a constant
speed. The combined kinetic energy of the girl
and her bicycle is 1600J. She then slows
down.
What is the new combined kinetic energy of
the girl and her bicycle when their
COMBINED MOMENTUM is half its
previous value?
36.
The volume of a certain mass of air at 270C is
3m3. If the temperature is increased to 127 0C
without changing the pressure, what will the
new volume of the air be?
37.
A car is accelerating uniformly in a straight
line. Which of the following displacement—
time graphs could represent its motion?
Momentum
Total energy
Kinetic energy
A solid cylinder of mass 20kg has a flat base
of area 0.1 m2 in contact with the level table
on which it rests.
A
B
C
D
E
35.
Power = 2000 + l0 W
Time = 300 + 1 s
Mass = 5.0 + 0.2kg
Final temperature — 50 + 0.5 0C
Change in temperature = 30 + 1 0C
In the diagram, a force of 10 N is pulling a
trolley along a level surface.
If the trolley moves 3 m against a frictional
force of 2 N, what is the work done against
friction?
38.
The acceleration due to gravity is 10 ms-2 on
Earth and 26 ms-2 on another planet. On Earth,
a ball released from rest takes 0.5 s to drop
through a certain height.
Assuming that the resistance of the
atmospheres can be neglected in both cases,
the time for the ball to drop from rest through
the same height on the other planet would be
39.
The forces shown below act on the trolley of
mass 2kg which is originally at rest on a level
surface.
The velocity—time graph for the trolley is
40.
An object of mass 2kg, initially at rest, is
acted upon by the changing force shown on
the graph.
42.
Two vehicles moving along a linear air track
collide with each other. After impact, they
stick together and continue to move along the
track.
Which of the following statements is/are
correct?
I
II
III
What is the change in momentum produced by
the force?
80 kgms -1
40 kgms -1
20 kgms -1
10 kgms -1
5 kgms -1
A
B
C
D
E
41.
Ball P is projected vertically upwards with a
velocity v, while an identical ball Q is
projected at the same time with velocity 2v at
an angle of 30o to the horizontal.
In the absence of air resistance, which of the
following statements is/are true?
I
II
III
P and Q will hit the ground at the same
instant.
The vertical deceleration of P is greater
than that of Q.
P will rise to a greater vertical height than
Q.
A
B
C
D
E
I only
I and III only
II only
II and III only
I, II and III
A
B
C
D
E
The collision is inelastic.
The total change in momentum is zero.
The total change in kinetic energy is zero.
None of these
I only
II only
I and II only
I, II and III
43.
Which of the following graphs shows the
relationship between the volume of an
enclosed mass of ideal gas and its temperature
when the pressure is kept constant?
44.
Graphs X and Y show the pressure, volume
and temperature of a fixed mass of gas during
an experiment in which the gas starts with the
conditions shown at point 1 and undergoes
changes to the conditions shown at point 2.
Which of the following statements is/are correct?
I
II
III
A
B
C
D
E
45.
The gas expands according to Boyle’s Law.
The gas is compressed at constant
temperature.
The pressure decreases at constant
temperature.
I only
III only
I and II only
I and III only
II and III only
A ball is projected horizontally with a velocity
of 30ms-1 from the top of a high tower.
After what time will its velocity be in the
direction 45o to the horizontal, if air resistance
can be neglected?
46.
The diagram shows a collision between two
trolleys X and Y. The momentum of trolley X
before and after collision, and the momentum
of Y before the collision are as indicated.
Both trolleys are travelling to the right after
they collide.
What is the momentum of trolley Y after the
collision?
47.
In the diagram shown below, the pendulum
bob, of mass 2kg, is released from position B,
80cm above the lowest position of the bob at
A.
50.
A motocross rider takes a jump which is 1.25
m high. He lands l0 m from the base of the
jump.
Assuming that he was travelling horizontally
when he left the edge and that air resistance
can be ignored, at what speed did he approach
the jump?
A
B
C
D
E
Assuming no air resistance, what is the speed
of the bob when it reaches A?
51.
48.
The graph below represents the motion of a
body falling freely in a vacuum.
5 ms-1
10 ms-1
15 ms-1
20 ms-1
25 ms-1
Figure 1 shows a trolley of mass 2kg moving
to the right with a constant velocity of 10ms-1.
The quantity y plotted along the vertical axis
is
A
B
C
D
E
49.
speed
distance
acceleration
force
kinetic energy
A car is travelling at 25ms-1. The brakes are
applied for 5 s and the speed is reduced to
15ms-1. How far does the car travel in this
time if the deceleration is uniform?
A
B
C
D
E
25 m
50 m
75 m
l00 m
175 m
At a certain instant, a constant force of 6 N is
suddenly applied to the trolley in a direction to
the left as shown in Figure 2. The acceleration
of the trolley while this force acts is
A
B
C
D
E
3 ms-2 to the right
3 ms-2 to the left
7 ms-2 to the right
12 ms-2 to the right
12 ms-2 to the left.
52.
A car of mass m is travelling with a constant
velocity up a hill at an angle  to the
horizontal, as indicated.
55.
53.
m g cos + F
m g cos — F
m g sin + F
m g sin — F
mg + F sin.
56.
A projectile is fired at an angle  to the
horizontal. The vertical and horizontal
components of velocity at the instant of firing
are as shown.
What will be the vertical and horizontal components of velocity after 5 s, if air resistance is
negligible?
0.14 kgm-3
1.4 kgm-3
14 kgm-3
140 kgm-3
1400 kgm-3
A
B
C
D
E
If F is the resultant resistive force acting on
the car, the effective engine force needed to
maintain this constant velocity must be
A
B
C
D
E
The pressure gauge on an oxygen cylinder of
capacity 0.1 m3 reads 1.0x 107 Pa. The density
of oxygen at atmospheric pressure (1.0xl05 Pa)
is 1.4 kgm-3. Assuming that the temperature
remains constant, what is the density of the
oxygen in the cylinder?
The acceleration-time graph of an object
starting from rest is shown below.
What is the velocity after 6 s?
57.
A ball X of mass 1 kg travelling at
5 ms-1strikes a stationary ball Y of mass 2kg.
If ball X bounces back along its original path
at 1 ms-1, what will be the speed of ball Y?
58.
The statements below were found in a pupil’s
notebook.
I
II
III
Acceleration, velocity and displacement are
all vector quantities.
Force and weight are vector quantities but
mass is a scalar quantity.
Time, distance and speed are all scalar
quantities.
Which of these statements is/are correct?
A
B
C
D
E
54.
A motorcycle safety helmet has a soft inner
lining which is compressed on impact with the
skull. This design protects the skull because it
A
B
C
D
E
decreases the impulse applied to the
skull
increases the time of impact of the
skull
decreases the time of impact of the
skull
decreases the change in momentum of
the skull
increases the change in momentum of
the skull.
I only
II only
III only
II and III only
I, II and III
59.
A mass of 0.060 kg is suspended from a
spring balance inside a lift. The lift accelerates
downwards at 4.0 ms-2.
What is the reading on the spring balance
during this acceleration?
A
B
C
D
E
0.60N
0.24N
0.36N
0.84N
24N
60.
The graph below shows how the acceleration
of a rocket, in outer space, changed during a
l0s period.
The rocket motors produced a constant thrust of
4.0 x 104N.
How much fuel was used in the l0s period?
A
B
C
D
E
0.4 x l03 kg
1.6 x l03 kg
2.0 x l03 kg
2.4 x l03 kg
4.0 x l03 kg
61.
The speed-time graph below represents the
motion of an object moving along a straight
line with an initial speed u and a speed v after
time t.
The average speed during this time interval t
is given by
62.
A steel ball of mass m is released from point P
and it moves along a track which is bent into a
loop, as shown.
Neglecting friction, the kinetic energy of the
ball at point Q is given by
A
B
C
D
E
mgx
mgy
mg(x + y)
mg(y-x)
mg√( x2 + y2)
63.
A shell is fired from a gun at an angle to the
horizontal. Graphs are drawn of its horizontal
component of velocity Vh and its vertical component of velocity Vv , against time t, up to the
time when the shell reaches its maximum
height.
Assuming air resistance to be negligible,
which pair of the following graphs is correct?
64.
The motion of an object of mass 2 kg over a 6
s period is described on the following
velocity-time graph.
There are no opposing forces acting on the
object which is moving in a straight line along
a horizontal surface.
Which of the following can be calculated from
the information given?
I
II
III
A
B
C
D
E
65.
66.
The average acceleration over the 6 s period
The kinetic energy of the object after 3 s
The work done on the object during the 6s
period
67.
One million kilograms of water per minute
flow through the turbines of a hydroelectric
power station, after falling through a height of
50 m. The turbines develop a useful power
output of 5MW.
Calculate the percentage efficiency of the
energy conversion.
68.
A bicycle pump has its barrel full of air at a
pressure of 1.0 x l05 Pa. The pressure in the
tyre which is to be inflated is 1.5 x l05 Pa. If
the original volume of air in the barrel is
600 cm3 and there is no temperature change
during the movement of the piston, what will
be the new volume of air in the pump when
the tyre valve is just beginning to open?
69.
The velocity—time graph for the vertical
component of the velocity of an object thrown
upwards and falling onto the roof of a building
is shown below.
I only
I and II only
I and III only
II and III only
I,II and III
A fixed mass of gas condenses at atmospheric
pressure to form a liquid. By how much does
its density increase and by how much does the
spacing between its molecules decrease?
In a Test Match, a cricket ball follows the path
shown from X to V. A fielder at Z starts
running when the ball is directly overhead at
H.
What is the average speed of the fielder during
his run from Z to Y, where he catches the ball
just before it touches the ground?
The height of the building is
A
B
C
D
E
l0 m
40 m
45 m
50 m
80 m.
70.
Two trolleys are joined together by a thread
and are pulled by a horizontal force of 12 N
along a level track as shown.
71.
The acceleration of an object which starts
from rest varies with time as shown below.
One second after starting from rest, the thread
breaks at X. Neglecting possible effects of
friction, which statements correctly describe
the motion of both trolleys after the thread
breaks?
Which graph is the corresponding velocity—
time graph?
72.
For an inelastic collision, between two linear
air track vehicles, which of the following
statements is/are true?
I
II
III
A
B
C
D
E
73.
74.
The graph below shows the variation with
time of the force exerted on a body of mass 2
kg.
The total momentum of the vehicles is
conserved.
The total kinetic energy of the vehicles
is conserved.
The total energy remains constant.
I only
II only
III only
I and II only
I and III only
During the four seconds, the momentum of the
body changes by
The graphs below show the horizontal and
vertical components of velocity of a projectile,
from the moment it is fired until it lands 8 s
later.
A
B
C
D
E
75.
1.5 kg ms -1
3 kg ms -1
10 kg ms -1
20 kg ms -1
32 kg ms -1
A pendulum bob of mass 2kg is released from
P. Its speed at the lowest point Q is v.
The mass of the bob is reduced to 1 kg and it
is released again from the same point, P.
Assuming that frictional effects can be
neglected, its speed at Q will now be
What is the speed of the projectile 2s after
firing?
A
B
C
D
E
15 ms-1
17.5 ms-1
20 ms-1
25 ms-1
35 ms-1
76.
An object moves from rest and travels with a
constant acceleration. The correct kinetic
energy—time graph of its motion is
77.
Gas in a cylinder is at room temperature and us
pressure is greater than atmospheric pressure.
Some of the gas is released into the atmosphere
and the cylinder is then re-sealed.
What would a graph of pressure/volume for the
gas in the cylinder look like while the gas is
being released?
78.
A balloonist, rising at a constant speed of
15ms-1, drops a sandbag overboard.
Assuming that the air resistance on the
sandbag is negligible, how long does it take to
return to the height at which it was released?
79.
An object of mass 10kg is moving down a
slope, as shown in the diagram, with a
constant acceleration of 10ms-2. An applied
force of 200 N acts down the plane. The
component of weight down the plane is 50 N.
What is the value of the friction force
opposing the motion?
80.
A projectile fired at an angle of 45o to the
horizontal has an initial vertical component of
velocity of 30ms -1.
What is the maximum height reached by the
projectile, assuming that air resistance is
negligible?
81.
The following graph shows how the force
applied to an object of mass 5 kg varies with
time. The object is initially at rest.
The corresponding displacement-time
velocity-time graphs are shown by
and
82.
A lift on an oil rig rises vertically with a
constant speed of 2.0ms-1. After it passes a
platform, a spanner falls from the lift and hits
the platform
3.0 s later.
84.
The product FORCE x VELOCITY could be
measured in the same units as
A
B
C
D
E
85.
energy
acceleration
power
momentum
impulse.
Two linear air track vehicles, P and Q, are
projected towards each other as shown in the
diagram.
The masses of P and Q are 0.4kg and 0.2kg
respectively and their velocities are as
indicated.
The height of the lift above the platform at the
instant the spanner falls is
A
B
C
D
E
If vehicle Q rebounds to the right with a
velocity of 2ms-1, what happens to vehicle P?
30 m
39 m
45 m
51 m
90 m.
A
B
C
83.
Two masses are joined together by string Y
and then hung from a beam using string X.
D
E
86.
It is stationary after the collision.
It rebounds to the left with a velocity of
1 ins-1.
It continues to the right with a velocity
of 1 ins-1.
It rebounds to the left with a velocity of
7 ms-1.
It continues to the right with a velocity
of 7 ms-1.
A skier of weight 700 N is pulled up a 20o
incline at a constant speed by a tow rope
which is acting at 35o to the incline.
String X is burned through using a candle.
Neglecting the mass of each string, what is the
tension in string Y
I
II
BEFORE string X is burned through,
and
AFTER string X is burned through?
When he has moved 20 m along the incline,
the gravitational potential energy (in joules)
gained by the skier is given by
A
B
C
D
E
700 x 20 sin 20o
500 x 20 cos 35o
700 x 20 cos 20o
500 cos 35o x 20 sin 20o
700 sin 20o x sin 55o
87.
When a substance changes from liquid to gas
at atmospheric pressure, its density changes by
a factor of the order of
A
B
C
D
E
88.
92.
10-5
10-4
10-3
10-2
10-1
A
B
C
D
E
The speed—time graph for a vehicle moving
in a straight line is shown below.
93.
12 000 N
14 400 N
24 000 N
26 400 N
48 000N
A competitor completes the following
sequence of displacements in 10 minutes
during part of an orienteering event.
Which entry in the following table gives the
competitor’s total displacement, average speed
and average velocity for this part of the event?
What is the average speed of the vehicle
during the 25 seconds?
89.
A rocket of mass 1200 kg rises vertically from
a planet which has a gravitational field
strength of 20Nkg-1.
The rocket accelerates away from the surface
of the planet at 2 ms-2.
What force must the rocket motors produce to
give this acceleration?
A ball is projected horizontally from the top of
a cliff with a speed of 40ms-1.
Assuming no air resistance, what is the speed
of the ball 3 seconds after it leaves the edge of
the cliff?
90.
Two trolleys are moving in the same direction
as shown below. The trolleys collide and
move off coupled together after impact.
How much kinetic energy does the system
lose during the impact?
91.
The pressure of a fixed mass of gas is 200
kPa. What is the new pressure of the gas after
its kelvin temperature has been trebled and its
volume has been doubled?
94.
An object travelling at 20ms-1 has 500J of
kinetic energy.
After undergoing an acceleration, the value of
its kinetic energy is increased to 2000J. What
is the new speed of the object?
A
B
C
D
E
40 ms-1
60 ms-1
80 ms-1
160 ms-1
320 ms-1
95.
The speed—time graph for a train on a
straight, level track is shown below.
Which of the following shows the
corresponding displacement—time graph for
the train?
96.
The diagram shows the view from above a
level, frictionless table, where a 1 kg mass is
being accelerated by a horizontal force acting
along direction OP.
Which of the following arrangements would
produce the same component of acceleration
along direction OP if the forces act
horizontally on the masses shown?
97.
The diagram shows the dimensions and
masses of three cubes P, Q and R.
99.
A physical quantity y is related to three other
quantities by
where  represents density, g represents
gravitational field strength and h represents
height.
Which of the following could be a unit for
quantity y?
A
B
C
D
E
The three blocks are arranged as shown
below.
100.
Nm
Nm-2
N kg-1
kg m-3
kg m-2
A ball is thrown horizontally from the top of a
cliff. It takes 2 seconds to strike the water
below and it enters the water at 45o to the
horizontal.
The pressure at the surface where Q makes
contact with R is
A
B
C
D
E
98.
833 Pa
2222 Pa
3750 Pa
7500 Pa
20 000 Pa
The volume of a fixed mass of gas is halved,
the temperature remaining constant. The gas
pressure doubles due to
A
B
C
D
E
each molecule delivering on average
twice the impulse per collision with the
walls of the container
each molecule delivering on average
the same impulse per collision but
twice as often
the forces of repulsion between the gas
molecules being twice as great
the forces of attraction between the gas
molecules being twice as great
molecules colliding with the walls
twice as often because of their
increased speed.
Assuming that the acceleration due to gravity
is 10 ms-2 and that air resistance is negligible,
what must be the initial horizontal velocity of
the ball?
101.
The acceleration due to gravity on a certain
planet is 2 ms-2. An astronaut, who has a mass
of 50 kg on Earth, travels to this planet. What
is her kinetic energy when she is moving
across the surface of the planet at l0ms-1?
102.
A spring-loaded cylinder is mounted at right
angles to the top surface of a trolley and a ball
is laid on top of the compressed spring, as
shown below.
The mass of the ball is exactly the same as the
mass of the adapted trolley. When the trolley
is moving along a horizontal runway at
20cms-1 the spring is released by remote
control and the ball is ejected.
What will be the speed of the trolley Just after
the ball is ejected?
103.
The volume of a fixed mass of ideal gas is
12 m3 at 270C.
What is the volume at 127 0C and twice the
original pressure?
Answers
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
C
E
A
E
E
E
C
D
A
D
D
E
A
D
B
E
E
B
A
C
D
C
100 m
3000 N
20 kg ms-1
2 kg ms-1
D
E
C
A
A
D
C
6J
400 J
4 m3
B
C
A
B
A
D
D
D
3s
8 kg ms-1
4 ms-1
A
C
A
B
C
D
B
D
10 ms-1
3 ms-1
E
C
B
A
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
D
A
E
C
12 ms-1
60 %
400 cm3
B
C
D
E
D
D
C
E
E
3s
150 N
45 m
A
B
B
C
A
C
C
10 ms-1
50 ms-1
15 J
300 kPa
D
C
A
A
C
B
B
B
20 ms-1
2500 J
10 cms-1
8 m3