Year 10 Physics Practice Test 7

The questions in your test are set out below. You do not lose marks for wrong answers. Once you have completed the test, click Submit.

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1. The speed of light is 3.0 x 108 m s-1.  How many km. would it travel in 2.5 hr?
A) 2.5x 1010 km B) 5.4 x 108 km C) 7.5 x 104 km D) 2.7 x 109 km E) 3.5 x 109 km

2. The average acceleration of an electron in a television tube is  7.0 x 1014 m s-2.  What speed will the electron reach if it accelerates from rest for a time 3.0 x 10-7 s?
A) 4.1 x 104 m s-1 B) 2.6 x 107 m s-1 C) 3.1 x 104m s-1 D) 3.1 x 105 m s-1 E) 2.1 x 108 m s-1

3. A creeper in the tropics grows at a rate of 5.2 x 10-6 m s-1. How much will it grow in 8.0 hours?
A) 1.5 x 10-1 m B) 2.5 x 10-3 m C) 4.5 x 106 m D) 4.7 x 10-6 m E) 3.6 x 10-2 m

4. The acceleration due to gravity in Melbourne is 9.80 m s-2.  What speed would an object reach if it started from rest and accelerated at that rate for 1.00 year?
A) 7.49 x 105 m s-1 B) 6.94 x 106 m s-1 C) 3.09 x 108 m s-1 D) 6.09 x 106 m s-1 E) 8.09 x 105 m s-1

5. The radius of the Earth is 6.38 x 106 m. How many days would it take a world class walker to travel (non-stop) around the equator at her average walking speed of 4.00 m s-1?     ( C  =  2pR )
A) 1.96 x 103 days B) 1.16 x 102 days C) 4.16 x 102 days D) 1.56 x 106 days E) 4.16 x 103 days

6. A hydrogen atom has a mass of 1.7 x 10-27 kg. How many hydrogen atoms will there be in 1.0 tonne of hydrogen?
A) 3.9 x 1019 atoms B) 1.9 x 1028 atoms C) 5.9 x 1029 atoms D) 6.0 x 109 atoms E) 2.9 x 1023 atoms

7. An 80kg person stands on top of a 200m tall burning building. The emergency workers, on the ground, instruct the person to jump. At what speed will the person hit the special cushion placed on the ground? (Assume no air resistance).
A) (2 X 9.8 X 200)4 = speed m/s B) (2 X 9.8 X 200)1/4 = speed m/s C) (2 X 9.8 X 200)1/2 = speed m/s D) (0.5 X 9.8 X 200)2 = speed m/s E) (9.8 X 200)1/2 = speed m/s

8. A 400kg ball is released 30 m off the ground and is allowed to swing, like a pundulum, from side to side. Assuming no energy loss from the system, what is the total energy of the ball at any point along its circular path?
A) 400 X 9.8 X 30 = joules of energy B) 400 X 9.8 X 30/2 = joules of energy C) (400 X 9.8 X 30)2 = joules of energy D) 2 X 400 X 9.8 X 30 = joules of energy E) (0.5 X 400 X 9.8 X 30)2 = joules of energy

9. A 500kg metal sphere is raised 20m off the ground and allowed to swing like a pendulum from side to side. Look at the animation on the right. Which expression best calculates the amount of kinetic energy the sphere has at point "B"?
A) (2 X 500 X 9.8 X 20) - (500 X 9.8 X 5.5) = kinetic energy in joules B) (500 X 9.8 X 20) - (500 X 9.8 X 5.5) = kinetic energy in joules C) (500 X 9.8 X 20)2 - (500 X 9.8 X 5.5) = kinetic energy in joules D) (500 X 9.8 X 20)1/2 - (500 X 9.8 X 5.5) = kinetic energy in joules E) (500 X 9.8 X 20) - (500 X 9.8 X 5.5)1/2 = kinetic energy in joules

10. Calculate the speed of the 500kg sphere at point"B" assuming no energy is lost from the system.
A) (500 X 9.8 X 20) - (500 X 9.8 X 5.5) = speed m/s B) ((500 X 9.8 X 20) - (500 X 9.8 X 5.5))2 = speed m/s C) (2 X 9.8 X 14.5)1/2 = speed m/s D) (500 X 9.8 X 20) - (500 X 9.8 X 5.5)1/2 = speed m/s E) (9.8 X 25.5)1/2 =speed m/s

11. A rocket with a total mass of 1000kg (includes 450kg of fuel) sits on the launch pad. After launch it reaches a maximum altitude 0f 450m where it momentarily comes to a stop. Assume no air resistance or energy loss from the system.The rocket's flight path is shown on the right. If point "B" is 120m off the ground, calculate the speed of the rocket at "B"
A) The speed of the rocket is 20.42m/s B) The speed of the rocket is 800.2m/s C) The speed of the rocket is 0.42m/s D) The speed of the rocket is 8.42m/s E) The speed of the rocket is 80.42m/s

12. A rocket takes off and reaches a maximum altitude of 1,200m. The roket, at its maximum altitude has a mass of 2,300kg. The flight path of the rocket is shown on the right. Calculate the speed with which the rocket hits the ground at "C". Assume no air resistance and that no energy is lost from the system.
A) The speed of the rocket at "C" is 153.4m/s B) The speed of the rocket at "C" is 133.4m/s C) The speed of the rocket at "C" is 1.4m/s D) The speed of the rocket at "C" is 15m/s E) The speed of the rocket at "C" is 54.4m/s

13. Look at the animation on the right of a rocket launch. Which statement below is true about the energy content of the rocket at each stage?
A) In stage “A” all the energy present is chemical potential. B) In stage “B” the rocket has kinetic energy and increasing chemical potential energy. C) In stage “C” the rocket has gravitational potential energy and chemical potential energy. D) In stage “D” all the energy present in the rocket is gravitational potential. E) In stage “D” kinetic energy is the lowest of all the stages of flight.

14. A student was asked to shade in the relative amounts of the three different forms of energy at two particular stages during the flight of a model rocket. The student was asked to assume all energy before launch is in chemical potential energy and that no energy is lost. What is wrong with the way the energy levels are shaded?

A) The rocket is not high enough to achieve any amount of gravitational potential energy so this column should not be shaded. B) Chemical potential energy never decreases and the amount stays constant. C) The amount of gravitational potential energy present is zero and therefore no shading should be present in the gravitational potential energy column. D) The amount of kinetic energy present is zero and therefore no shading should be present in the kinetic energy column. E) The sum of kinetic energy and gravitational potential energy exceeds the amount of chemical potential energy lost. This means that energy has been created and this can not be true.

15. A 0.34 kilogram ball is dropped from a hovering craft on a planet with no atmosphere but with an identical gravitational force to that of Earth. The ball crashes into the surface of the planet at a speed of 34.5 ms-1. From what altitude was the ball released?
A) Height = 6.1 X 102 metres B) Height = 60.7 metres C) Height = 0.006 metres D) Height = 0.6 metres E) Height = 5.9 metres

16. A 500 gram rocket is launched on a planet with no atmosphere but with an identical gravitational force to that of Earth. The rocket reaches an altitude of 1.5km before crashing into the surface of the planet. At what speed did the rocket crash into the surface?
A) Speed = 1.71 X 102 metres / sec B) Speed = 1.74 metres / sec C) Speed = 0.002 metres / sec D) Speed = 17.4 metres / sec E) Speed = 5.9 metres / sec

17. A 300gram toy rocket reaches a height of 180m. Assuming constant mass and no energy is lost due to air resistance calculate the speed of the rocket at impact.
A) Speed = 5.94 X 104 metres / sec B) Speed = 594 metres / sec C) Speed = 0.006 metres / sec D) Speed = 59.4 metres / sec E) Speed = 0.59 metres / sec

18. At which position will the cart have maximum gravitational potential energy?
A) A B) B C) C D) D E) E

19. The diagram on the right shows a 350kg cart travelling at a speed of 6m/s on a frictionless track. Assuming no air resistance what is the total energy at point "B"?
A) 10.42KJ B) 1,041.6J C) 1,041.6KJ D) 10,416J E) 47.46KJ

20. The velocity-time graph of a model rocket is shown on the right. If the rocket travels vertically skyward at what point on the graph does the parachute deploy?
A) A B) B C) C D) D E) According to the graph the parachute is never deployed.