Important Questions of Motion in A Plane Physics | Zigya

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131.

A particle starting from the origin (0,0) moves in a straight line in the (x,y) plane. Its coordinates at a later time are  ( square root of 3 comma space 3). The path of the particle makes with the x -axis an angle of:

  • 30o

  • 45o C

  • 60o C

  • 60o C

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132.

A car moves from X to Y with a uniform speed vu and returns to Y with a uniform speed vd. The average speed for this round trip is:

  • fraction numerator 2 straight v subscript straight d straight v subscript straight u over denominator straight v subscript straight d plus straight v subscript straight u end fraction
  • square root of straight v subscript straight u straight v subscript straight d end root
  • fraction numerator straight v subscript straight d straight v subscript straight d over denominator straight v subscript straight d plus straight v subscript straight u end fraction
  • fraction numerator straight v subscript straight d straight v subscript straight d over denominator straight v subscript straight d plus straight v subscript straight u end fraction
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133. bold A with bold rightwards arrow on top bold space and bold space bold B with bold rightwards arrow on top are two vectors and θ is the angle between them if vertical line bold A with bold rightwards arrow on top bold space straight x bold space bold B with bold rightwards arrow on top bold vertical line bold space equals bold space square root of bold 3 bold space bold left parenthesis bold A with bold rightwards arrow on top bold. bold B with bold rightwards arrow on top bold right parenthesis the value of θ is:
  • 60o

  • 45o

  • 30o

  • 30o

838 Views

134.

A particle moving along x- axis has acceleration f, at time t, given f = fo (1-t/T), where fo and T are constants. The particle at t =0 and the instant when f = 0, the particle's velocity (vx) is:

  • foT

  • foT2/2

  • foT2

  • foT2

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135.

For angles of projection of a projectile at angles (45° - θ) and (45° + θ), the horizontal ranges described by the projectile are in the ratio of

  • 1:1

  • 2:3

  • 1:2

  • 1:2

2420 Views

136.

A car runs at aconstant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively is

  • 0, 0

  • 0, 10 m/s
  • 10 m/s,  10m/s

  • 10 m/s,  10m/s

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137.

The vectors bold A with bold rightwards arrow on top space and space bold B with bold rightwards arrow on top are such that a:
open vertical bar straight A with rightwards arrow on top plus straight B with rightwards arrow on top close vertical bar space equals space open vertical bar straight A with rightwards arrow on top space minus space straight B with rightwards arrow on top close vertical bar
The  angle between the two vectors is

  • 90 degree
  • 60 degree
  • 75 degree
  • 75 degree
358 Views

138.

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time t2. The time taken by her to walk up on the moving escalator will be

  • fraction numerator straight t subscript 1 space plus straight t subscript 2 over denominator 2 end fraction
  • fraction numerator straight t subscript 1 space straight t subscript 2 over denominator t subscript 2 minus t subscript 1 end fraction
  • fraction numerator straight t subscript 1 space straight t subscript 2 over denominator t subscript 2 plus t subscript 1 end fraction
  • fraction numerator straight t subscript 1 space straight t subscript 2 over denominator t subscript 2 plus t subscript 1 end fraction
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139.

The moment of the force, at (2, 0, 3) about the point (2,-2,2), is given by


140.

A body is projected vertically upwards. The times corresponding to height h while ascending and while descending are t1 and t2, respectively.

  • gt1t22

  • g(t1 +t2)2

  • gt1t2

  • gt1t2(t1+t2)


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