A ball of mass 2 kg is moving with velocity 20 m/sec strikes with the surface and rebounds with same speed, if time of contact is 0.1 sec then calculate average force on the ball.
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A mass 2m moving with some speed is directly approaching another mass m moving with double speed.
Correct answer is (B) 3/2
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A car moving at a speed 10 m/s on a straight road is ahead of car B moving in the same direction at 6 m/s. Find the velocity of A relative
Given: vA = 10 m/s, vB = 6 m/s, To find: (i) Velocity of A relative to B (vA – vB) (ii) Velocity of B relative to A (vB – vA) Formulae: (i) vAB = vA – vB (ii) vBA =...
2 Answers 1 views
A jet is releasing water at the rate of 6 kg/see with speed of 4 m/sec. Now this water strikes a block of mass 10 kg. find the force exerted on block
Correct Answer - `(f=24N,a=2.4m//sec^(2))`
2 Answers 11 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...
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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...
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A cricket ball of mass 150 g moving with a velocity of 12 m/s is turned back with a velocity of 20 m/s on hitting the bat.
m = 0.150 kg, v = 20 m/s, u = -12 m/s and t = 0.01 s To find: Average force (F) Formula: F = \(\frac{m(v-u)}{t}\) Calculation: From formula, F = \(\frac{0.150[20-(-12)]}{0.01}\) = 480 N The average force exerted...
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A body of mass m strikes a wall with velocity v and rebounds with the same speed. Its change in momentum is
Correct Option is: (A) 2 mv Initial velocity of body before collision u = v then initial momentum Pi = - MV final velocioty of the body \(P_f = MV\) Change in momentum \(\Delta P =...
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A body of mass m strikes a wall with velocity v and rebounds with the same speed. Its change in momentum is
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A body is moving with initial velocity 30 m/s. After certain time it acquires velocity of 40 m/s, then the velocity in middle of its journey is
Correct option is A) 25√2
2 Answers 2 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