i want help in simple pendulum lab report.

how electromagnet works?

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what is SI unit of momentum?

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what is SI unit of momentum?

 Explain the 3D vector?

 Explain the 3D vector?

1.       A stone is thrown from a cliff and it lands in the sea as shown below. Air resistance is negligible.

          Which of the following statements is correct whilst the stone is in motion?

A.      The vertical component of the stone’s displacement is constant.

B.      The horizontal component of the stone’s displacement is constant.

C.      The vertical component of the stone’s velocity is constant.

D.      The horizontal component of the stone’s velocity is constant.

(Total 1 mark)

2.       This question is about projectile motion.

          A sphere is projected horizontally. The sphere is photographed at intervals of 0.10 s. The images of the sphere are shown against a grid on the diagram. Air resistance is negligible.

(a)     Use data from the diagram to determine the acceleration of free fall.

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(3)

(b)     Determine the speed of the sphere 1.2 s after release.

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(5)

(c)     On the grid, draw the path of the sphere assuming air resistance is not negligible.

(2)

(Total 10 marks)

3.       The diagram shows the path of a projectile that is launched with velocity v. Air resistance is negligible.

          A second projectile has double the mass of the first projectile and is launched with the same velocity. Air resistance is still negligible. Which of the following paths best represents the path of the projectile? (The original path is shown as a dotted line)

(Total 1 mark)

4.       This question is about collisions.

(a)     State the principle of conservation of momentum.

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(2)

(b)     In an experiment, an air-rifle pellet is fired into a block of modelling clay that rests on a table.

(not to scale)

          The air-rifle pellet remains inside the clay block after the impact.

          As a result of the collision, the clay block slides along the table in a straight line and comes to rest. Further data relating to the experiment are given below.

                   Mass of air-rifle pellet                      = 2.0 g
Mass of clay block                           = 56 g
Velocity of impact of air-rifle pellet = 140 m s–1
Stopping distance of clay block        = 2.8 m

(i)      Show that the initial speed of the clay block after the air-rifle pellet strikes it is 4.8 m s–1.

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(2)

(ii)     Calculate the average frictional force that the surface of the table exerts on the clay block whilst the clay block is moving.

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(4)

(c)     The experiment is repeated with the clay block placed at the edge of the table so that it is fired away from the table. The initial speed of the clay block is 4.3 m s–1 horizontally. The table surface is 0.85 m above the ground.

(not to scale)

(i)      Ignoring air resistance, calculate the horizontal distance travelled by the clay block before it strikes the ground.

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(4)

(ii)     The diagram in (c) shows the path of the clay block neglecting air resistance. On the diagram, draw the approximate shape of the path that the clay block will take assuming that air resistance acts on the clay block.

(3)

(Total 15 marks)

5.       An object moves in the x-y plane. The graphs below show how the component of its velocity Vx in the x-direction and the component of its velocity Vy in the y-direction, vary with time t.

          The particle is moving

A.      in a parabola.

B.      with simple harmonic motion.

C.      with constant velocity in a straight line.

D.      in a circle.

(Total 1 mark)

6.       A stone is thrown horizontally from the top of a cliff with an initial speed v.

          The time of flight of the stone is t and its range R. Air resistance is negligible.

          For a stone that is thrown horizontally from the top of the cliff with an initial speed 3v, which of the following is correct?

(Total 1 mark)

7.       This question is about motion of a charged particle in an electric field.

(a)     An α-particle of mass 4u and charge +2e is accelerated from rest in a vacuum through a potential difference of 2.4 kV. Show that the final speed of the α-particle is
4.8 × 105 m s–1.

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(2)

(b)     The α-particle is travelling in a direction parallel to and mid-way between two parallel metal plates.

(not to scale)

          The metal plates are of length 2.4 cm and their separation is 0.80 cm. The potential difference between the plates is 600 V. The electric field is uniform in the region between the plates and is zero outside this region.

(i)      Calculate the magnitude of the electric field between the plates.

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(2)

(ii)     Show that the magnitude of the acceleration of the α-particle by the electric field is 3.6 × 1012 m s–2.

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(2)

(c)     (i)      Calculate the time taken for the α-particle to travel a horizontal distance of 2.4 cm parallel to the plates.

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(1)

(ii)     Use your answers in (b)(ii) and (c)(i) to deduce whether, as the α-particle passes between the plates, it will hit one of the plates.

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(3)

(Total 10 marks)

8.       A football is kicked with an initial velocity u at an angle θ to the horizontal and reaches the ground t seconds later.

          Ignoring air resistance what is the range R of the football?

A.      ut

B.      ut cos θ

C.      ut sin θ

D.      ut tan θ

(Total 1 mark)

9.       This question is about throwing a stone from a cliff.

Antonia stands at the edge of a vertical cliff and throws a stone vertically upwards.

          The stone leaves Antonia’s hand with a speed v =8.0 m s–1. Ignore air resistance, the acceleration of free fall g is 10 m s–2 and all distance measurements are taken from the point where the stone leaves Antonia’s hand.

(a)     Determine,

(i)      the maximum height reached by the stone.

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(2)

(ii)     the time taken by the stone to reach its maximum height.

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(1)

(b)     The time between the stone leaving Antonia’s hand and hitting the sea is 3.0 s. Determine the height of the cliff.

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(3)

(Total 6 marks)

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 A particle of mass m is moving with constant speed v in uniform circular motion. What is the total work done by the centripetal force during one revolution 

A)Zero

B)mv²/2

C)mv²

D) 2πmv²

 A particle of mass m is moving with constant speed v in uniform circular motion. What is the total work done by the centripetal force during one revolution 

A)Zero

B)mv²/2

C)mv²

D) 2πmv²

 A particle of mass m is moving with constant speed v in uniform circular motion. What is the total work done by the centripetal force during one revolution 

A)Zero

B)mv²/2

C)mv²

D) 2πmv²

 momentum

momentum

 momentum

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