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Motion in a Plane · Question 48

AIPMT 2001MCQEasy📈 Topic in 0% papers+4−1
1

If | A + B | = | A | + | B |, then angle between A and B will be

  1. 90
  2. 120
  3. 0
  4. 60

Answer

(3) 0

Solution

| A + B |2 = A2 + B2 + 2AB

Given | A + B |2 = (A + B)2 = A2 + B2 + 2AB

2AB = 2AB

= 1

= 0 (the vectors are parallel)

Answer: (3)

AIPMT 2001

Keep practising — Motion in a Plane

2

Two particles having mass M and m are moving in a circular path having radius R and r. If their time periods are the same, then the ratio of their angular velocities will be

  1. rR
  2. Rr
  3. 1
  4. Rr
AIPMT 2001
3

A particle is projected making an angle of 45 with horizontal having kinetic energy K. The kinetic energy at highest point will be

  1. K 2
  2. K2
  3. 2K
  4. K
AIPMT 2001
4

The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river along the shortest path in 15 min. Then the velocity of river stream is

  1. 3 km/hr
  2. 4 km/hr
  3. 29 km/hr
  4. 41 km/hr
AIPMT 2000
5

Two projectiles of same mass and with same velocity are thrown at an angle 60 and 30 with the horizontal, then which will remain same

  1. time of flight
  2. range of projectile
  3. maximum height acquired
  4. all of them
AIPMT 2000

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