Get Fit Physics Spring Break Revision

8/7/2019 Get Fit Physics Spring Break Revision

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Get Fit Physics: Spring Holidays 2011Have a go at these questions. Follow the plan I have given you so that your study workload will not

be too much.

1) A search helicopter flies 300km due eastfrom its base then 400km due south.The complete journey takes 5 hours.

Find the helicopter`sa) Displacement from its base.b) Average speedc) Average velocity

2) A student measures the acceleration of gravity.She records the following results in ms -2 9.72, 9.83, 10.52, 9.67 and 9.82Calculatea) The mean value of the accelerationb) The random error in the measurements

3) A car travelling at a velocity of 12ms -1 accelerates at 3ms -2 for a distance of 200m.Calculate the velocity of the car at theend of the 200m

4) The acceleration time graph of a moving objectis shown below

Draw the corresponding velocity time graph forthe moving object`s acceleration

5) An aerosol can has an internal pressure

of 200kPa at a temperature of 20C.Find the internal pressure when thetemperature is raised to 75C

6) Find the time it takes for a sandwich tofall to the ground from the LeaningTower of Pisa which is 55 metres high.Assume no air resistance

7) Using the kinetic model of gases explain whathappens to the pressure of a gas inside a sealedcontainer if the gas is heated and itstemperature increases.

8) A motion sensor draws a graph from the dataof a cart that accelerates from rest at 4ms -2 for2 seconds and then its acceleration changes to-2ms -2 for 2 seconds

a) Sketch the velocity time graph of the cartfor the four seconds of its journey.

b) Find the displacement of the cart afterits 4 second journey.


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9) A footballer kicks a ball towards a brick wall 26 metres away with a velocity of 20 ms -1 at an angle of 30 O to the horizontal.a) Calculate the horizontal and vertical components of the ball`s velocityb) Find the time it takes for the ball to reach the wall.c) How high up the wall will the ball strike?

26m

10) Calculate the work done ( energytransferred ) when a 5 Coulomb charge ismoved between the electric plates shown

200V 350V

11) A cuboid of solid carbon dioxide has a volume of 2.5 cm 3. When heated it changes completely into a gas.

Calculate the volume of carbon dioxide gas produced

12) Four identical resistors of 2 are connected as shown.Calculate the total resistance of each combination.

13) The electric circuit shown has two 8 ohmresistors in parallel connected in serieswith a 16 ohm resistor and a 12 voltdc supply with negligible internal resistance.

a) Calculate the total resistance of the circuit.b) Find the current in the circuit.

c)

Find the pd across the 16 resistor

16

8

8

12V

14) A container full of air has a mass of 370.58g.Some of the air is squeezed out of the containerinto an upturned flask.The volume of squeezed out air equals 1687cm 3.The mass of the container is measured again andfound to have a mass of 368.72g.

Calculate the density of the air in g/cm3

.

15) A battery has an emf of 12 volts and aninternal resistance of 1.5 ohms.a) Explain what is meant by an emf of 12 Vb) Find the short circuit current which

would flow if the terminals of the batterywere connected by a piece of copper

wire.


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16) Calculate the refractive index of the materialshown:

15O

20 O17) Two identical speakers are connected to

the same signal generator.At position P the second minimum is heardfrom the central maximum.Find the wavelength of the sound.

2.60m

2.00m P

18) A force of 36N is applied to two boxes on africtionless table.a) What is the acceleration of both boxes?b) What force does the 4kg box give to the

8kg box?c) What size of force does the 8kg block

exert on the 4kg block?

8kg4kg36N

19) A 5kg parcel accelerates down a slope of angle 30 O to the horizontal. The parcel hasa frictional force of 4.5 N acting on it.a) Calculate the component of the

parcel`s weight acting parallel to theslope

b) Find the unbalanced force acting onthe parcel and its acceleration.

30 O

20) An AC supply is connected to an oscilloscope.The settings for the volts/division and the time base

are shown on the controls.

a) Find the peak voltage of the AC supply.b) Find the rms voltage of the AC supplyc) Show that the frequency of the AC supply

is 50 Hz.

Volt/div

ms/div

3

5

21) A laser beam is passed through a diffraction grating which has 500 lines per millimetre.A second order maximum fringe is found at an angle of 41 O from the central maximum.

a) Calculate the wavelength of laser light used.b) What two changes to the above set up would make the interference dots move further apart?

Lasergrating

41 O


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29) A student built an electric circuit to find the internalresistance of an electric cell.She obtained the graph of terminal potential differenceagainst current taken from the cell.a) Draw the circuit the student built.b) Find the emf of the cell from the graphc) Calculate the internal resistance from the graphd) Find the short circuit current from the cell.e) What is meant by the short circuit current?

22) Light of frequency 5.08 x 10 14 Hz ejectsphotoelectrons with a maximum kinetic energy of 4.5 x 10 -20 Joules from a metal`s surface.a) Calculate the work function of the metalb) What effect on the photoelectron`s

maximum kinetic energy would doubling the

irradiance of the light make.

23) The irradiance of a point source of light at adistance of 10cm is 64 Wm -2

Calculate the irradiance when the distancefrom the point source of light is increased to40cm

24) Find the total pressure which acts on the topsurface of submarine which is at a depth of 300min sea water which has a density of 1,200kgm -3

Atmospheric pressure at the surface is equal

to 1 x 10 5 Pa.

25) Write down the equivalent units for thefollowing:a) Joule per coulombb) N mc) N/m 2 d) Coulomb per volte) Coulomb per second

26) The graph shows the force which acted on an object of mass 2kg over a time of 4 seconds.Initially the object was at rest before the force was applied.

a) Calculate the change of momentum from the graphb) The final velocity of the object.c) Calculate the impulse given to the object.d) Find the average force given to the object.

27) An electron of charge 1.67 x 10 -19C passesthrough a potential difference of 6kV before ithits a radar screen.a) Calculate the kinetic energy of the electron

just before it strikes the screen.

b) If the mass of the electron is 9.11 x 10 -31kgfind its speed just before it strikes thescreen.

28) A car of mass 1000kg travelling at 8ms -1 crashesinto a stationary car of mass 800 kg.

a) If both cars stick together after the crashfind the velocity of the combined cars

immediately after the crash.b) Show by calculation that the crash is

inelastic.


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30) A ship is pulled by two tug boats as shown in thediagram below

Calculate by scale drawing the resultant forceacting on the ship due to the two tug boats.

30 O

30 O

40kN

40kN

31) A football is inflated with air atpressure 1.9 x 10 5Pa at atemperature of 17Ca) The ball is left in the sunshine till the

temperature of the air increases to 40C.Find the new air pressure inside the ball

b) Explain the rise in pressure using thekinetic theory of gases.

32) A student builds the circuit shown to study the chargingof a capacitor through a resistor.a) What is the initial current when the switch is

closed?b) What is the initial pd across the capacitor when

the switch is just closed.

c)

What is the energy stored in the capacitor whenthe pd across the resistor is 2.5V? 200 2000 F

6V

A

33) The refractive index for the glass prism is 1.53 for blue lightand 1.51 for red light. White light is shone through the prism.a) Which colour, blue or red, travels faster through

the prism. Justify your answer.b) If P and Q represent the ends of the visible

spectrum which letter represents the red part.c) Calculate angle x O.

d) The prism is replaced by a grating write down thetwo main differences which appear on the screenbetween the prism and grating.

30 OxO

P

Q

34) An electron makes a transition fromenergy level E O to E 2 by absorbing theenergy of a photon of light.

a) Calculate thewavelength of the photon.

E2=- 2.5x10-19J

E1= -3.0x10-19J

EO= -4.5 x 10-19J

35) A ball is kicked into the air. At a certain time in itsflight the velocity vectors are shown.

Calculate the ball`s speed atthis instant.

30ms -1

40ms-1

36) The graph shows the velocity time graph of a trolley which is pushedup a slope with initial velocity 4ms -1

a) Calculate the distance the trolley went up the slope.b) Draw an acceleration time graph for the trolley`s motion up to 7sc) Explain what happens at 4 seconds into the trolley`s journey.


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Get Fit Physics Spring Break Revision