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Physics -- Kinematics and Forces
11.
Two particles are projected simultaneously in the same vertical plane, from the same point, but with different speeds and at
different angles to the horizontal. The path followed by one, as seen by the other, is
- A.a vertical straight line
- B.a straight line making a constant angle ( 90) with the horizontal
- C.a parabola
- D.a hyperbola
- Answer
- Report
Answer : [B]
12.
Two particles are projected simultaneously in the same vertical plane from the same point, with different speeds u1 and u2, making angles θ1 and θ2 respectively with the horizontal, such that u1cos θ1 = u2cos θ2. The path followed by one, as seen by the other (as long as both are in flight), is
- A.a horizontal straight line
- B.a vertical straight line
- C.a parabola
- D.a straight line making an angle |θ1 - θ2| with the horizontal
- Answer
- Report
Answer : [B]
13.
A particle is thrown with a speed u at an angle θ to the horizontal. When the particle makes an angle φ with the horizontal, its speed changes to v.
- A.v = ucos θ
- B.v = ucos θ . cos φ
- C.v = ucos θ . sec φ
- D.v = usec θ . cos φ
- Answer
- Report
Answer : [C]
14.
Two identical spheres move in opposite directions with speeds v1 and v2 and pass behind an opaque screen, where they may either cross without touching (Event 1) or make an elastic head-on collision (Event 2).
- A.We can never make out which event has occurred.
- B.We cannot make out which event has occurred only if v1 = v2.
- C.We can always make out which event has occurred.
- D.We can make out which event has occurred only if v1 = v2.
- Answer
- Report
Answer : [A]
15.
Blocks A and B have masses of 2 kg and 3 kg respectively. The ground is smooth. P is an external force of 10 N. The force exerted by B on A is
- A.4N
- B.6N
- C.8N
- D.10N
- Answer
- Report
Answer : [B]
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