Last seen: Nov 14, 2021
Correct answer: (1) Phytoplankton Zooplankton Fish
Correct answer: (4) soil
(i) We have x = ∴ -x = -(-x) = - = = x (verified) [∵ (-) x (-) = (+)] (ii) We have x = - ∴ -x = = [∵ (-) x (-) = (+)] -(-x) = = ...
(a) X are unbalanced force. (b) Y are balanced forces.
The two forces acting on the car are force of friction and air resistance. Force of friction contributes more to slow down and stop the car.
Mass of ball = 500 g = 0.5 kg Initial velocity = 10 m/s (i) Initial momentum = 0.5 x 10 = 5 kg.m/s (ii) Velocity at the highest point = 0 m/s...
In this case, the bicycle has been compelled to change its state of motion by the external force of air resistance and friction. If there were no air ...
The wall will receive equal momentum from both the balls because both balls have equal mass and velocity.
(a) When a bus takes a sharp turn, the passengers tend to fall sideways because of their inertia or their tendency to continue moving in a straight li...
(a) If the resultant of all the forces acting on a body is zero, the forces are called balanced forces. These forces do not change the state of rest o...
(a) Kicking a stationary football. (b) Applying brakes to a moving bicycle. (c) Pressing an accelerator to speed up a moving car. (d) A moving...
(a) Force is an influence which tends to set a stationary body in motion or stop a moving body; or which tends to change the speed and direction of a ...
(a) Momentum is the physical quantity which is the measure of the quantity of motion of a moving body. It depends on mass and velocity of the body. ...
Mass of car, m = 10 kg Momentum = m x v (a) Velocity, v = 5 m/s Momentum = 10 x 5 = 50 kg.m/s (b) Velocity, v = 20 cm/s = 0.2 m/s Momen...
It is dangerous to jump out of a moving bus because the jumping man, who is moving with the high speed of the bus would tend to remain in state of mot...
When a tree is shaken, the tree moves to and fro while the fruits and leaves remain in their state of rest on account of their inertia and thus fruits...
When a hanging carpet is beaten with a stick, the carpet moves to and fro with the force of the stick while the dust particles remain in their state o...
When a bus stops suddenly, its passengers tend to fall forward because due to their inertia, the passengers tend to remain in a state of motion even t...
When a bus starts suddenly, its passengers tend to fall backwards because due to their inertia, the passengers tend to remain in a state of rest even ...
Inertia of a body depends on its mass. A cricket ball has more inertia than a rubber ball of the same size because it has more mass than the rubber ba...