A mass 2m moving with some speed is directly approaching another mass m moving with double speed. After some time, they collide with coefficient of restitution 0.5. Ratio of their respective speeds after collision is
(A) 2/3
(B) 3/2
(C) 2
(D) 1/2
1 Answers
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The car delivered the cargo from point A to point B, moving at average speed `mu_(1)=40km//h`. Turning back, the car was moving at an average speed of
Correct Answer - D `t_(1)=(x)/(40),t_(2)=(x)/(60)` `v_(av)=(2x)/(t_(1)+t_(2))=(2x)/((x)/(40)+(x)/(60))=(2xx60xx40)/(100)=48km//hr`
2 Answers 1 views
A particle of mass 40 mg and carrying a charge `5 xx 10^(-9) C` is moving directly towards a fixed positive point charge on magnitude `10^(-8) C`. Whe
If the particle comes to rest momentarily at a distance r from the fixed charge, then from conservation of energy, we have ? `1/2 m u^(2) +1/(4pi epsi_(0)) (Qq)/a=1/(4pi epsi_(0))...
2 Answers 5 views
A short magnet porduces a deflection of `30^(@)` when placed at certain distance in tanA position of magnetometer. If another short magnet of double t
Correct Answer - `[60^(@)]`
2 Answers 1 views
An astronaut approaching the moon sends a radio signal of frequency `5 xx 10^(3)` MHz towards moon to find the speed of his rocket . The frequency of
Correct Answer - `2.58 km s^(-1)`
2 Answers 1 views
A hydrogen atom moving at speed `v` collides with another hydrogen atom kept at rest .Find the minimum value of `v` for which one of the atoms may get
Correct Answer - `[7.2 xx 10^(4)m//s]`
2 Answers 2 views
In photosynthesis directly light driven reaction are called (A)_____ while some reactions are depends on the products of light reaction (ATP and NADPH
Correct Answer - A-light reaction B-dark reactions
2 Answers 1 views
A ladder is inclined to a wall making an angle of 30° with it. A man is ascending the ladder at the rate of 3 m/sec. How fast is he approaching the wa
Correct Answer - `1.5 m//sec`
2 Answers 3 views
A 10 kg mass moving at 5 m/s collides head on with a 4 kg mass moving at 2 m/s in the same direction. If e = 1/2, find their velocity after impact.
Given: m1 = 10 kg, m2 = 4 kg u1 = 5 m/s, u2 = 2 m/s, e = \(\frac{1}{2}\) To find: Velocity after impact (v1 and v2) Formulae: i. m1u1 + m2u2 = m1v1 + m2v2 ii. e = \((\frac{v_2-v_1}{u_1-u_2})\) Calculation: From formula (i), 10 × 5...
2 Answers 1 views
If work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of same material, but with double the radius and half
Correct option is: (D) 16
2 Answers 1 views
For some change in temperature the amount of heat absorbed by a substance is directly proportional to …………………
Correct option is A) mass
2 Answers 1 views