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A disc of mass 100 g is kept floating horizontally in air by firing bullets, each of mass 5g with the same velocity at the same rate of 10 bullets/s.The bullets rebound with the same speed in opposite direction,the velocity of each bullet at the time of impact is
Options
(a) 196 cms⁻¹
(b) 9.8 cms⁻¹
(c) 98 cms⁻¹
(d) 980 cm⁻¹
Correct Answer:
980 cm⁻¹
Explanation:
Rate of change in momentum of the bullets balances weight of the plate
2m’vn = mg
.·. v = mg/2m’n = (100 x 980)/(2 x 5 x 10)
= 980 cm⁻¹
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Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The kinetic energy needed to project a body of mass m from the surface of earth
- If an A.C. mains supply is given to be 220 V, what would be the average e.m.f.
- A boat is sent across a river with a velocity of 8 km/h.If the resultant velocity
- The de-Broglie wavelength of neutron in thermal equilibrium at temperature T is
- An objective moves ,starting from rest through a resistive medium
Topics: Laws of Motion (103)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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