Motion In A Plane CBSE Questions & Answers

Motion In A Plane

This is Physics Class 11 Motion in a Plane CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A physics book slides off a horizontal tabletop with a speed of 1.10 m/s. It strikes the floor in 0.350 s. Ignore air resistance. Find the horizontal distance from the edge of the table to the point where the book strikes the floor
  • A
    0.365 m
  • B
    0.385 m
    Correct
  • C
    0.371 m
  • D
    0.395 m
2
A physics book slides off a horizontal tabletop with a speed of 1.10 m/s. It strikes the floor in 0.350 s. Ignore air resistance. Find the horizontal and vertical components of the book’s velocity, and the magnitude and direction of its velocity, just before the book reaches the floor.
  • A
    3.60 m/s, 72.2\(^\circ \) below horizontal
    Correct
  • B
    3.90 m/s, 68.2\(^\circ \) below horizontal
  • C
    3.70 m/s, 71.2\(^\circ \) below horizontal
  • D
    3.80 m/s, 70.2\(^\circ \) below horizontal
3
Two crickets, Chirpy and Milada, jump from the top of a vertical cliff. Chirpy just drops and reaches the ground in 3.50 s, while Milada jumps horizontally with an initial speed of 95.0 cm/s. How far from the base of the cliff will Milada hit the ground?
  • A
    3.11 m
  • B
    3.23 m
  • C
    3.32 m
    Correct
  • D
    3.04 m
4
Inside a starship at rest on the earth, a ball rolls off the top of a horizontal table and lands a distance D from the foot of the table. This starship now lands on the unexplored Planet X. The commander, Captain Curious, rolls the same ball off the same table with the same initial speed as on earth and finds that it lands a distance 2.76D from the foot of the table. What is the acceleration due to gravity on Planet X?
  • A
    1.18 m \({{\rm{s}}^{ - {\rm{2}}}}\)
  • B
    1.28 m \({{\rm{s}}^{ - {\rm{2}}}}\)
    Correct
  • C
    1.08 m \({{\rm{s}}^{ - {\rm{2}}}}\)
  • D
    1.58 m \({{\rm{s}}^{ - {\rm{2}}}}\)
5
A major leaguer hits a baseball so that it leaves the bat at a speed of 30.0 m/s and at an angle of 36.9\(^\circ \) above the horizontal. You can ignore air resistance. At what two times is the baseball at a height of 10.0 m above the point at which it left the bat?
  • A
    0.643 s, 2.89 s
  • B
    0.683 s, 2.99 s
    Correct
  • C
    0.673 s, 3.09 s
  • D
    0.653 s, 3.19 s
6
A major leaguer hits a baseball so that it leaves the bat at a speed of 30.0 m/s and at an angle of 36.9\(^\circ \) above the horizontal. You can ignore air resistance. Calculate the horizontal and vertical components of the baseball’s velocity at each of the two times the baseball is at a height of 10.0 m above the point at which it left the bat
  • A
    25.0 m/s, 12.3 m/s; 24.0 m/s, -11.3 m/s
  • B
    24.0 m/s, 11.3 m/s; 24.0 m/s, -11.3 m/s
    Correct
  • C
    27.0 m/s, 14.3 m/s; 24.0 m/s, -14.3 m/s
  • D
    26.0 m/s, 13.3 m/s; 24.0 m/s, -13.3 m/s
7
A major leaguer hits a baseball so that it leaves the bat at a speed of 30.0 m/s and at an angle of 36.9\(^\circ \) above the horizontal. You can ignore air resistance. What are the magnitude and direction of the baseball’s velocity when it returns to the level at which it left the bat?
  • A
    35.0 m/s, 32.9\(^\circ \) below the horizontal
  • B
    30.0 m/s, 36.9\(^\circ \) above the horizontal
  • C
    30.0 m/s, 36.9\(^\circ \) below the horizontal
    Correct
  • D
    40.0 m/s, 46.9\(^\circ \) below the horizontal
8
A man stands on the roof of a 15.0-m-tall building and throws a rock with a velocity of magnitude 30.0 m/s at an angle of 33.0\(^\circ \) above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock;
  • A
    12.6 m
  • B
    11.7 m
  • C
    14.2 m
  • D
    13.6 m
    Correct
9
A man stands on the roof of a 15.0-m-tall building and throws a rock with a velocity of magnitude 30.0 m/s at an angle of 33.0\(^\circ \) above the horizontal. You can ignore air resistance. Calculate the magnitude of the velocity of the rock just before it strikes the ground.
  • A
    29.6 m/s
  • B
    30.6 m/s
  • C
    34.6 m/s
    Correct
  • D
    32.6 m/s
10
Vectors can be added by
  • A
    translating the two vectors
  • B
    parallelogram law of addition
    Correct
  • C
    adding the magnitudes of the vectors
  • D
    adding the angles of the vectors
11
Vectors can be added by
  • A
    adding the angles of the vectors
  • B
    adding the magnitudes of the vectors
  • C
    translating the two vectors
  • D
    vector addition
    Correct
12
Vector addition is
  • A
    asymmetric
  • B
    associative
    Correct
  • C
    intransitive
  • D
    non-commutative
13
Which of the following physical quantities a vector?
  • A
    angular frequency
  • B
    acceleration
    Correct
  • C
    number of moles
  • D
    density
14
Which of the following physical quantities a scalar?
  • A
    relative velocity
  • B
    current
    Correct
  • C
    average velocity
  • D
    linear momentum
15
Which of the following physical quantities a vector?
  • A
    temperature
  • B
    impulse
    Correct
  • C
    charge
  • D
    gravitational potential