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give 7 examples of inertia of rest with explanation
A gardener waters the plants by a pipe of diameter 1 mm. The water comes out from the pipe atthe rate of 10 cm3/sec. The reactionary force exerted on the hand of the gardener is?
How to find the least count of a spring balance?
give examples of inertia of direction with explanation
A ball of mass 400g dropped from a height of 5m. A boy on the ground hits the ball vertically upwards with a bat with an force of 100N so that it attains a vertically height of 20m. The time for which the ball remains in contact with the bat? (g = 10m/s2)
how many types of inertia are there name them
define one newton force
what is the formula of recoil velocity of a gun?????????
explain why a cricketer moves his hands backwards while catching a fast moving cricket ball.
please explain newton's third law of motion!
A Bead Of Mass m is attached to one end of a spring of natural length R And spring constant
K = (√3+1)mg/R . other end of the spring is attached toa point A ON the vertical ring of radius R MAKING AN ANGLE OF 30 DEGREE WITH ITS CIRCUMFERENCE THE NORMAL REACTION AT THE BEAD WHEN THE SPRING IS ALLOWED TO MOVE FROM POINT A
what is relation between the newton and dyne ?
if a man jumps out from a boat , the boat moves backwards . why?
Derive the equation for the conservation of momentum
A monkey of mass 30 kg climbs a rope which can withstand a maximum tension 360 N . Find the maximum acceleration which this rope can tolerate for the climbing of monkey (g = 10 m/s^2) .
Experts, please answer fast.
1) The minute hand of a clock is 7 cm long. Calculate the distance covered and the displacement of minute hand of the clock from 9.00 AM to 9.30 AM.
2) An athlete completes a round of a circular track of diameter 200 m in 20s. Calculate the distance travelled by the athlete.
3)A boy is running on a straight road. He runs 500 m towards north in 2 minutes 10 seconds and then turns back and runs 200 m in 1 minute. Calculate his average speed and magnitude of average velocity during the whole journey.
4) Akshil drove his car with speed of 20 km/h while going to his college. When he returned to his home along the same route , the speed of the car is 30 km/h. Calculate the average speed of the car during the entire journey.
name and define three different types of inertia and give an example each
From a rifle of mass 4kg, a bullet of mass 50g is fired with an initial velocity of 35 ms-1. Calculate the initial recoil velocity of the rifle.
a particle slides down a smooth inclined plane of elevation Ө, fixed in an elevator going up with an acceleration a. The base of the inclined plane has length L. Find the time taken by the particle to reach the bottom.
Define force and write its si. Unit
A bullet when fired at a target has its velocity decreased to 50 % after penetrating 30 cm into it.Then the additional thickness it will penetrate in cm before coming to rest
a) 10 cm b) 30 cm c) 40 cm d) 60 cm
The bullet of mass 10g moving with a velocity of 400m/s gets embeded in a freely suspended wooden block of mass700g .what is the velocity aquired by a block
examples of newton's second law of motion
why are road accidents at high speed are very much worse than accidents at low speed???
A body of mass 5 Kg is moving with a velocity of 10 m/s. A force is applied on it so that in 25 s , it attains a velocity of 35 m/s. calculate the value of the force applied.
in ncert book of science activity 9.4 is given :
Make 2 chidren stand on 2 different carts and give them 1 sand bag and ask them to play catch - Catch . Do each of them recieve an instantaneous reaction of throwing sandbag (action) ?
ALL THE FORMULAS IN THIS CHAPTER FORCE AND LAWS OF MOTION CAN ANY ONE SAY ME ASAP
on what factors does inertia of a body depend?
a rubber ball of mass 50 g falls from a height of 10 cm and rebounds to a height of 50 cm. determine the change in linear momentum and average force between the ball and the ground , taking time of contact as 0.1 s
What is the real definition of Second Law Of Motion
how does a karate player breaks a slab of ice with a single blow?
An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
(a) 32 N (b) 0 N (c) 2 (d) 8 N
a truck starts from rest and rolls down a hill with a constant acceleration .it travels a distance of 400m in 20s . find the acceleration . find the force acting on it if its mass is 7 metric tonne (1 metric tonne = 1000kg).
a stone of 1kg is thrown with a velocity of 20m/s. across a frozen surface of a lake and comes to rest after travelling a distance of 50m. what is the force of friction between the stone and the ice.
a hunter has a machine gun that can fire 50 g bullets with a velocity of 150 m/s . a 60 kg tiger springs at him with a velocity of 10 m/s . how many bullets must the hunter fire per second into the tiger in order to stop him in his track
explain why buildings & dams have wide foundations
a bullet of mass 20g is horizontally fired with a velocity of 150m/s frm a pistol of mass 2kg. What is the recoil velocity of the pistol?
Why shockers are provided in automobile vehicles?
Find the initial velocity of the car which is stopped in 10 sec by applying brakes .The retardation due to brakes is 2.5m/sec sq.....
A certain particle has a weight of 30N at a place where the acceleration due to gravity is 9.8m/s2
a)What are its mass and weight at a place where acceleration due to gravity is 3.5 m/s2.
b)What will be its mass and weight at a place where acceleration due to gravity is zero.
A bullet fired from a gun makes a clean whole in a window whereas a stone pebble thrown brakes the whole window.why?
How much momentum will a dumbbell of mass 10 Kg transfer to the floor if it falls from a height of 80 cm? Take its downwards acceleration to be 10 m/s2?
can someone plz tell me the derivations of equations of motions without graph ..
A metal plate weighing 200g is balanced in mid air by throwing 40 balls per second vertically upwords from below. After collision balls comes out with the same speed. What is speed with which balls strike the plate? (Given mass of each ball 200g)
why chinaware is wrapped in straw while transportation?
Suppose an astronaut lands on the moon and drops an object from a height of 4.97m from the surface. How much time will it take to reach the moon's surface?
A gunman gets a jerk on firing a bullet.why??
a bullet of mass 10 g is fired from a rifle with a velocity of 800 m/s . after passing through a mud wall 180cm thick, the velocity drops to 100m/s. calculate the average resistance of the wall.
action and reaction forces do not balance each other. why?
Few examples of balanced and unbalanced force?
a machine gun fires a bullet of mass 4kg with velocity of 12m/s.the person holding it can apply a maximum force of 144n on the gun.what is the maximum number of bullets that can be fired per second
why is it difficult to balance our body when we accidentally step on a peel of banana give reasons
object of mass 1 kg travelling in a straight line with a velocity of
10 m s−1
collides with, and sticks to, a stationary wooden block of mass 5 kg.
Then they both move off together in the same straight line. Calculate
the total momentum just before the impact and just after the impact.
Also, calculate the velocity of the combined object.
object of mass 100 kg is accelerated uniformly from a velocity of 5 m
to 8 m s−1
in 6 s. Calculate the initial and final momentum of the object. Also,
find the magnitude of the force exerted on the object.
solution for science activity 9.5 for class 9
how a karate player can break a pile of tiles with a single blow of his hand
if you shake the branches of tree,the fruits fall down. why?
When a carpet is beaten with a stick dust comes out. why?
When a horse pulls a cart,the force which is responsible for the movement of cart is
a) The force of horse on cart b) The force of ground on horse c) The force of the ground on cart d) The force of the horse on the ground
A force of 5 N gives a mass m1, an acceleration of 10 m s-2 and a mass m2, an acceleration of 20 m s-2. what acceleration would it give if both the masses were tied together?
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