Two bullets A & B fired simultaneously, horizontally and with different speeds from the same plane. Which bullet will hit the ground first ?
A) A
B) B
C) A and B
D) Depend on their masses
1 Answers
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Bullets of mass 40 g each, are fired from a machine gun at a rate of 5 per second towards a firmly fixed hard surface of area 10 cm^2.
For the collision, u1 = 400 m s-1, e = 0.75 For the firmly fixed hard surface, u2 = v2 = 0 e = 0.75 = \(\frac{v_1-v_2}{u_2-u_1}=\frac{v_1-0}{0-400}\) ∴ v1 = -300 m/s. Negative sign indicates that the bullet rebounds in exactly...
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A bullet of mass 0.1 kg moving horizontally with a velocity of 20 m/s strikes a target and brought to rest in 0.1 s.
Given: m = 0.1 kg, u = 20 m/s, t = 0.1 s To find: Impulse (J), Average force (F) Formulae: i. J = mv – mu ii. F = \(m\frac{(v-u)}{t}\) Calculation: From formula (i). J = m(v...
2 Answers 2 views
A bullet of mass 10 g is fired from a gun of mass 1 kg with recoil velocity of gun = 5 m/s. The muzzle velocity will be
Correct option is: (D) 500 m/s Using conservation of linear momentum. \(m_1 \ v_1 = m_2 \ v_2\) \(v_1 = \frac{m_2 \ \times \ v_2}{m_1}\) \(v_1 = \frac{1 \times 5}{10 \times 10^{-3}}\) \(v_1 = \frac{5000}{10}\) \(v_1 =...
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A bullet of mass 10 g is fired from a gun of mass 1 kg with recoil velocity of gun = 5 m/s. The muzzle velocity will be
2 Answers
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Degenerate orbitals have ,same l value and same n value , different l value and same n value
A) same l value and same n value
2 Answers 1 views
Two solid spheres of same metal but of mass M and 8M fall simultaneously on a viscous liquid and their terminal
The terminal velocity is given by v, where v α r2 (r = radius of the sphere). The mass of the sphere can be given by \( m = \frac{4}{2} \pi...
2 Answers 1 views
If a body is projected horizontally from the top of a tower the time taken by it to reach the ground depends upon
B) height of the tower
2 Answers 1 views
A body is projected horizontally with a velocity √(29) m/s from a height 10 m, the velocity on reaching the ground ……………… m/s.
Correct option is C) 15
2 Answers 1 views
A heavy truck and bicycle hit a wall, with same velocity. More damage to the wall expected from
A) heavy truck
2 Answers 1 views
If a badminton ball and a cricket ball hit you with same speed, which one hurts you more and why ?
D) Cricket ball – more momentum
2 Answers 3 views