Phy 111 - Elementary Mechanics

14 Questions | Total Attempts: 376

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Phy 111 - Elementary Mechanics

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Questions and Answers
  • 1. 
    Assuming that the Earth is a uniform sphere of radius 6.4 x 106 m and mass 6.0 x 1024 kg, find the gravitational field strength g at a point on the surface of the earth
    • A. 

      19.77ms-2

    • B. 

      199.10ms-2

    • C. 

      9.77ms-2

    • D. 

      100.7ms-2

  • 2. 
    Assuming that the Earth is a uniform sphere of radius 6.4 x 106 m and mass 6.0 x 1024 kg, find the gravitational field strength g at a point: at height 0.50 times the radius of above the Earth's surface
    • A. 

      14.314ms-2

    • B. 

      24.134ms-2

    • C. 

      10.314ms-2

    • D. 

      4.34ms-2

  • 3. 
    What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth
    • A. 

      gR^2/(R+h)2(gR2)/(R+h)2

    • B. 

      GR/(R+h)2

    • C. 

      GR/(R+h^2)2

    • D. 

      GR/(R^2+h)2

  • 4. 
    The instrument used for experimental determination of the value of the universal gravitational constant G is
    • A. 

      Galilio’s telescope

    • B. 

      Ballistic pendulum

    • C. 

      Newton’s balance

    • D. 

      Cavendish balance

  • 5. 
    A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?
    • A. 

      The passer-by is stationery relative to the passenger

    • B. 

      Both observers are in motion relative to each other

    • C. 

      The passenger is in motion relative to the passer-by

    • D. 

      The passer-by is in motion relative to the passenger

  • 6. 
    Which of the following statements is not correct about reference frames? 
    • A. 

      Any reference frame moving at constant velocity with respect to an inerial refernce frame is also inertial

    • B. 

      In non-inertial reference frames the motion of objects depend only on the interactions of constituent particles among themselves

    • C. 

      If the coordinate axes of a reference frame attached to an object remain fixed in space then the object is at rest

    • D. 

      Laws of physics are invariant in inertial reference frames

  • 7. 
    What are the dimensions of power (time rate of change of expending energy)
    • A. 

      MLT−2

    • B. 

      ML2T−3

    • C. 

      ML2T−2

    • D. 

      M2L2T−3

  • 8. 
    Two forces act on a point object as follows: 100N at 170derees and 100N at 50degrees. Find their resultant force
    • A. 

      100 N at 110o

    • B. 

      110 N at 50o

    • C. 

      110 N at 100o

    • D. 

      100 N at 50o

  • 9. 
    The speed of 90 hm/hr is equal to ------------------ m/s
    • A. 

      324

    • B. 

      90

    • C. 

      15

    • D. 

      25

  • 10. 
    Type question here
    • A. 

      Answer option 1

    • B. 

      Answer option 2

    • C. 

      Answer option 3

    • D. 

      Answer option 4

  • 11. 
    Identify the instrument above, which always spin continuously when torqued?
    • A. 

      Horoscope

    • B. 

      Stetoscope

    • C. 

      Gyroscope

    • D. 

      Spinoscope

  • 12. 
    A monkey in a perch 20m high in a tree drops a coconut above the head of a zoo keeper as he runs with a speed 1.5m/s beneath the tree. How far behind him in metres does the coconut hit the ground?
    • A. 

      3.03

    • B. 

      2.25

    • C. 

      3.06

    • D. 

      2.02

  • 13. 
    A monkey in a perch 20 m high in a tree drops a coconut above the head of a zoo keeper as he runs with a speed 1.5 m/s beneath the tree actually intending to hit the toes of the zoo keeper, how early in seconds should the coconut be dropped by the monkey
    • A. 

      1.35

    • B. 

      1.50

    • C. 

      2.04

    • D. 

      3.02

  • 14. 
    Which one do you like?
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

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