9702 Physics March 2025 Question paper 12

  = 8.99  109 m F–1) Planck constant h = 6.63  10–34 J s Stefan–Boltzmann constant  = 5.67  10–8 W m–2 K–4 Formulae uniformly accelerated motion s = ut +

1 at v 2 = u 2 + 2as hydrostatic pressure p =  gh upthrust F =  gV Doppler effect for sound waves of = s s v v v f  electric current I = Anvq resistors in series R = R1 + R2 + ... resistors in parallel R 1 = R + R + ...

Which quantity is a scalar quantity?

4 An aircraft, initially stationary on a runway, takes off with a speed of 85 km h–1 in a distance of no more than 1.20 km.

What is the minimum constant acceleration necessary for the aircraft? A 0.23 m s–2 B 0.46 m s–2 C 3.0 m s–2 D 6.0 m s–2

What is the mass of the car?

.0 m s–2 An object is fired upwards from horizontal ground. The object has an initial velocity of 20 m s–1 at an angle of 45° to the horizontal. Air resistance is negligible. Which statement describes the speed of the object after it is fired until immediately before it reaches the ground again?

Objects P and Q form an isolated system. Object P has mass 6.0 kg and is moving at a speed of 3.0 m s–1. Object Q has mass 2.0 kg and is moving at a speed of 4.2 m s–1 at an angle of 35° to the path of P. P 6.0 kg Q 2.0 kg 3.0 m s–1 4.2 m s–1 35° Objects P and Q collide and stick together. What is the magnitude of the component of the final momentum of the combined objects in the original direction of P?

An astronaut of mass m in a spacecraft experiences a gravitational force F = mg when stationary on the launchpad. What is the gravitational force on the astronaut when the spacecraft is launched vertically upwards with an acceleration of 0.2g ?

The diagram shows a child X of mass 20 kg and a child Y of mass 15 kg seated on a uniform plank. plank mass 7.0 kg pivot child X mass 20 kg child Y mass 15 kg The plank has a mass of 7.0 kg and has a pivot at its midpoint. The plank is horizontal and in equilibrium. Which statement about the weight of the plank is correct?

An object is fully submerged in a liquid. A student determines the ratio . object the of weight object the on acting upthrust Which single change would double the value of this ratio?

A shop sign weighing 75 N hangs from a frame attached to a vertical wall. 30° 0.50 m Y X Z sign weight 75 N wall The frame consists of a horizontal rod XY and a rod YZ that is at an angle of 30° to the horizontal. Rod XY is attached to the wall by a hinge at X and has length 0.50 m. Assume that the weights of the rods are negligible. What is the horizontal force exerted by the wall on rod XY?

A student takes measurements to calculate the density of a liquid in a beaker. The height of the liquid in the beaker is 0.20 m  2%. The internal diameter of the beaker is 0.05 m  3%. The mass of the liquid is 0.36 kg  10%. What is the percentage uncertainty in the calculated density of the liquid?

The diagram shows a uniform plank XY of length 4.0 m and weight 300 N. 4.0 m X Y support plank child The plank rests on fixed supports at its ends X and Y. A child of weight 600 N stands in different positions on the plank. The support at end X exerts a force F vertically upwards on the plank. What is the magnitude of F when the child stands at X and when the child stands at Y? F / N when child is at X F / N when child is at Y

Which relationship is used in the derivation of the equation shown? power = force  velocity

A block is released from rest at the top of a slope inclined at an angle to the horizontal. The slope has length L as shown in the diagram.
L There are no resistive forces acting on the block. What is the speed of the block at the bottom of the slope?

A skateboarder and her skateboard have a total mass of 70 kg. She pushes on the ground with her foot to create a forward force F of 25 N on herself and the skateboard, as shown in the diagram. F = 25 N total mass of skateboarder and skateboard 70 kg The skateboarder and skateboard travel forwards a distance of 0.50 m before the skateboarder lifts her foot from the ground. What is the work done by F on the skateboarder and skateboard?

A turbine at a hydroelectric power station is situated at a vertical distance of 30 m below the level of the surface of a large lake. The water passes through the turbine at a rate of 340 m3 per minute. The overall efficiency of the turbine and generator system is 90%. The density of water is 1000 kg m–3. What is the useful power output of the power station?

A projectile is launched at 45° to the horizontal with initial kinetic energy E. Assuming air resistance to be negligible, what will be the kinetic energy of the projectile when it reaches its highest point?

A wire is extended by a tensile force so that its deformation is elastic. What is meant by elastic deformation?

A bolt is subjected to a tensile force, as shown. d 2d X Y tensile force tensile force bolt The bolt has a circular cross-section. At end X, the diameter is 2d. At end Y, the diameter is d. What is the ratio X at stress Y at stress ?

The graph shows the relationship between force acting on a compression spring and change in length of the spring. 180 160 140 120 100 0.0 1.0 2.0 3.0 change in length / mm force / N 4.0 5.0 6.0 7.0 8.0 9.0 10.0 One of these springs is placed in each corner of a horizontal square plate. The axis of each spring is in a vertical direction. These four springs support a total load of 160 N. What is the total elastic potential energy stored in the four springs?

Which row correctly identifies the properties of all electromagnetic waves? transverse wave longitudinal wave can travel in free space

What is the approximate range of wavelengths in free space for infrared radiation?

The diagram shows a car travelling at a constant speed in a straight line between person P and person Q from point X to point Y. X person P person Q Y The car sounds its horn continuously as it travels. The horn emits sound of constant frequency. Which statements about what person P and person Q hear during the motion of the car are correct? Person P hears a sound of increasing frequency. Person Q hears a sound of decreasing frequency. Person Q always hears a sound of higher frequency than person P.

A progressive wave of frequency 300 Hz is travelling with a speed of 600 m s–1. What is the phase difference between two points on the wave that are a distance of 0.50 m apart?

A polarised beam of light with intensity I is incident normally on a polarising filter. The transmitted light has intensity I. The filter is rotated about the normal axis through an angle . The transmitted light has intensity 0.75I. What is the angle  ?

Light waves are emitted from two sources. What is a necessary condition for observable interference fringes to be produced?

The diagram shows a water wave in a shallow tank. The wave is diffracted through a gap in a barrier and spreads. The wavelength of the wave is much smaller than the width of the gap. barrier gap The wavelength of the wave and the width of the gap are both changed by a small amount. Which combination of changes must increase the amount of spreading due to diffraction? wavelength width of gap

Light of wavelength 567 nm is incident normally on a diffraction grating. The grating has 400 lines per mm. A number of diffraction maxima are observed on the far side of the grating. What is the angle between the second-order maximum and the third-order maximum?

Two cylindrical conductors, X and Y, are made from the same material. The conductors have equal lengths, but Y has a smaller diameter than X. X and Y are connected in series to a cell. Which row compares the number of charge carriers per unit time passing through X and through Y and compares the average drift speed of the charge carriers in X and in Y? number of charge carriers per unit time average drift speed of charge carriers

A copper wire is 6.4 m long and has a resistance of 0.92 . The resistivity of copper is 1.8  10–8  m. What is the diameter of the wire?

A thermistor is connected to a cell with negligible internal resistance. Which graph shows the variation with temperature of power, P, dissipated in the thermistor?

A metal electrical conductor has a resistance of 5.6 k. A potential difference (p.d.) of 9.0 V is applied across its ends. How many electrons pass a point in the conductor in one minute?

Which circuit symbol does not represent an electric component that is designed to emit sound waves?

The diagram shows a junction in a circuit where three wires, P, Q and R, meet. The currents in P and Q are 1 A and 3 A respectively, in the directions shown. P 1 A 3 A R Q How much charge passes a given point in wire R in a time of 5 s?

A cell of electromotive force (e.m.f.) E and internal resistance r is connected in series with a switch S and an external resistor of resistance R. E r R S P Q The potential difference (p.d.) between P and Q is V. Which statement is correct when S is changed from open to closed?

What is a general description of a baryon?

A stationary nucleus has nucleon number A. The nucleus decays by emitting a proton with speed v to form a new nucleus with speed u. The new nucleus and the proton move away from one another in opposite directions. Which equation gives v in terms of A and u?

What is the change to the quark composition of a nucleus that takes place during + decay?

What is the charge, in terms of the elementary charge e, on a charm quark?