A ball of mass 1 kg moves perpendicularly to a bat with a speed of 5 m/s. And the bat of 10 kg moves opposite to the ball with 2 m/s. After hitting ball moved with 15 m/s. What is the speed of bat after hit ?
A) 1 m/s
B) 2 m/s
C) 3 m/s
D) zero
1 Answers
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A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 m s^-1, what is the recoil speed of the gun?
Given: m1 = 0.02 kg, m2 = 100 kg, v1 = 80 m s-1 To find: Recoil speed (v2) Formula: m1u1 + m2u2 = m1v1 + m2v2 Calculation: Initially gun and shell are at rest. ∴ m1u1 + m2u2 = 0 Final momentum =...
2 Answers 1 views
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...
2 Answers 2 views
According to Newton’s third law of motion for every action there is equal and opposite reaction, why two equal and opposite
Forces of action and reaction always act on different bodies, hence they never cancel each other.
2 Answers 1 views
17A boy throws a ball of mass 200 g with a velocity 20m * s ^ - 1 at an angle of 40 degrees with the horizontal. What is the kinetic energy of the ball at the highest point of the
At highest position, occurs only horizontal component of velocity e.g., V = ucosθ, here θ is the angle of inclination of initial velocity with horizontal So, V = 20 cos40° Know, kinetic energy...
2 Answers 1 views
A car covers half the distance at a speed of 60 kmh^(-1) and the other half at a speed of 40 km h^(-1) The average speed of the car is
Correct option is B) 50 km h-1
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
Mass by mass percentage of a solution = A) mass of solute/mass of solution × 100
A) \(\cfrac{mass \,of \,solute}{mass \,of \,solution}\) × 100
2 Answers 1 views
An aeroplane takes 1 hour less for a journey of 1200 km if its speed is increased by 100 km/hr from its usual speed. Find its usual speed.
Let usual speed of aeroplane be x km/hr. Given, distance =1200 km Time taken for journey of 1200 km `=(1200)/(x) "hours"" "(because "Time"="Distance"/"Speed")` When the speed is increased by 100...
2 Answers 1 views
A particle of charge equal to that of electron and mass 208 times the mass of the electron moves in a circular orbit around a nucleus of charge `+3e.`
Correct Answer - 25
2 Answers 1 views
A bullet of mass `50` grams going at a speed of `200 ms^(-1)` strikes a wood block of mass `950 gm` and gets embedded in it. The velocity of the block
Correct Answer - B `v = (m_(1)u_(1)+m_(2)u_(2))/(m_(1)+m_(2))`
2 Answers 1 views