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Ques :

The graph shows the variation with time t of the velocity v of an object.

          Which one of the following graphs best represents the variation with time t of the acceleration a of the object?

(1)

 

2.       A ball, initially at rest, takes time t to fall through a vertical distance h. If air resistance is ignored, the time taken for the ball to fall from rest through a vertical distance 9h is

A.      3t.

B.      5t.

C.      9t.

D.      10t.

(1)

 


 

3.       A raindrop falling through air reaches a terminal velocity before hitting the ground. At terminal velocity, the frictional force on the raindrop is

A.      zero.

B.      less than the weight of the raindrop.

C.      greater than the weight of the raindrop.

D.      equal to the weight of the raindrop.

(1)

 

4.       The diagram below shows the path of a projectile in the absence of air resistance.

          Which one of the following diagrams best represents the path of the projectile under the same initial conditions when the air resistance is taken into account? (The path in absence of air resistance is shown for comparison as a dotted line.)

(1)

 


 

5.       A sailing boat is moving with constant velocity v to the right parallel to the dock.

          Sailor Hulot, up on the mast, drops his telescope at the moment he is opposite Lucie who is standing on the dock. Which one of the following best shows the path of the falling telescope as seen by Lucie?

(1)

 

6.       This question is about forces on charged particles.

(a)     A charged particle is situated in a field of force. Deduce the nature of the force-field (magnetic, electric or gravitational) when the force on the particle

(i)      is along the direction of the field regardless of its charge and velocity;

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(ii)     is independent of the velocity of the particle but depends on its charge;

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(iii)    depends on the velocity of the particle and its charge.

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(5)


 

(b)     An electron is accelerated from rest in a vacuum through a potential difference of 2.1 kV. Deduce that the final speed of the electron is 2.7 × 107 m s–1.

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(3)

          The electron in (b) then enters a region of uniform electric field between two conducting horizontal metal plates as shown below.

          The electric field outside the region of the plates may be assumed to be zero. The potential difference between the plates is 95 V and their separation is 2.2 cm.

          As the electron enters the region of the electric field, it is travelling parallel to the plates.

(c)     (i)      On the diagram above, draw an arrow at P to show the direction of the force due to the electric field acting on the electron.

(1)

(ii)     Calculate the force on the electron due to the electric field.

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(3)


 

(d)     The plates in the diagram above are of length 12 cm. Determine

(i)      the time of flight between the plates.

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(1)

(ii)     the vertical distance moved by the electron during its passage between the plates.

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(3)

(e)     Suggest why gravitational effects were not considered when calculating the deflection of the electron.

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(2)

(f)      In a mass spectrometer, electric and magnetic fields are used to select charged particles of one particular speed. A uniform magnetic field is applied in the region between the plates, such that the electron passes between the plates without being deviated.

          For this magnetic field,

(i)      state and explain its direction;

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(3)


 

(ii)     determine its magnitude.

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(2)

(g)     The electric and magnetic fields in (f) remain unchanged. Giving a brief explanation in each case, compare qualitatively the deflection of the electron in (f) with that of

(i)      an electron travelling at a greater initial speed;

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(ii)     a proton having the same speed;

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(iii)    an alpha particle (α-particle) having the same speed.

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(7)

(Total 30 marks)

 


 

7.       An athlete runs round a circular track at constant speed. Which one of the following graphs best represents the variation with time t of the magnitude d of the displacement of the athlete from the starting position during one lap of the track?

(1)

 

8.       A ball is released from rest near the surface of the Moon. Which one of the following quantities increases at a constant rate?

A.      Only distance fallen

B.      Only speed

C.      Only speed and distance fallen

D.      Only speed and acceleration

(1)

 


 

9.       A stone is thrown horizontally from the top of a high cliff. Assuming air resistance is negligible, what is the effect of gravitational force on the horizontal and on the vertical components of the velocity of the stone?

 

Vertical component of velocity

Horizontal component of velocity

A.

increases to a constant value

stays constant

B.

increases continuously

stays constant

C.

increases to a constant value

decreases to zero

D.

increases continuously

decreases to zero

(1)

 

10.     This question is about the kinematics of an elevator (lift).

(a)     Explain the difference between the gravitational mass and the inertial mass of an object.

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Ans :