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Syllabus

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 cm

^{3}/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/s

^{2})how many types of inertia are there name them

^{2})].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.

Thank you

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

^{2}).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) ?

Pls explain....

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

19. Figure shows equipotential surfaces concentric at 'O' the magnitude of electric field at distance r(in meter) measured from.

$\left(1\right)\frac{9}{{\mathrm{r}}^{2}}\left({\mathrm{Vm}}^{-1}\right)\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{6}{{\mathrm{r}}^{2}}\left({\mathrm{Vm}}^{-1}\right)\phantom{\rule{0ex}{0ex}}\left(3\right)\frac{2}{{\mathrm{r}}^{2}}\left({\mathrm{Vm}}^{-1}\right)\phantom{\rule{0ex}{0ex}}\left(4\right)\frac{16}{{\mathrm{r}}^{2}}\left({\mathrm{Vm}}^{-1}\right)$

What is the real definition of Second Law Of Motion

how does a karate player breaks a slab of ice with a single blow?

_{1}_{ }and T_{2}in the given figure ?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

Q9. An Aluminium wire and a Steel wire of the same length and cross-section are joined end to end. The composite wire is hung from a rigid support and a load is suspended from the free end. If the increase in the length of the composite wire is 2.7 mm, the increased length of Aluminium and Steel wires are:

(y

_{Al}= 2 x 10^{11}N/m^{2}& y_{Steel}= 7 x 10^{11}N/m^{2})(1) 2.0 mm & 0.7 mm

(2) 0.9 mm & 1.5 mm

(3) 1.75 mm & 15 mm

(4) 0.7 mm & 1.5 mm

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

Q36. A sample of radioactive substance decays simultaneously by two processes A and B with half lives 1/2 and 1/4 h respectively. For the first half hour it decays with process A, next one hour with process B, and for further half an hour with both A and B. If originally, there are N

_{0}nuclei, then the Number nuclei after 2 h of such decay$\left(1\right)\frac{{N}_{0}}{{2}^{8}}\left(2\right)\frac{{N}_{0}}{{2}^{4}}\left(3\right)\frac{{N}_{0}}{{2}^{6}}\left(4\right)\frac{{N}_{0}}{{2}^{5}}$

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.

Define: INERTIA

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

An 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._{1}and P_{2}watt at V volt are connected in series across V volt mains ,then their total power consumption P is 1) (P_{1}+P_{2}) 2)√P_{1 }P_{2 }3)P_{1}P_{2}/( P_{1}+P_{2}) 4)(P_{1 +}P_{2})/P_{1}P_{2. }Give reasons.An object of mass 100 kg is accelerated uniformly from a velocity of 5 m s

^{−1}to 8 ms

^{−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

As shown in the figure the mass m is placed on a smooth inclined plane of inclination 30o and 2m

hangs vertically. If the system is released, the blocks move with an acceleration equal to

(A) g/4 (B) g/3

(C) g/2 (D) g

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 m

_{1}, an acceleration of 10 m s^{-2 }and a mass m_{2}, an acceleration of 20 m s^{-2}. what acceleration would it give if both the masses were tied together?_{2 }and T_{1}is? 19. Three blocks A, B and C of masses 10 kg, 3 kg, and 5 kg respectively are connected by a light inextensible smooth horizontal plane. If a force of 36 N is applied to the string connected to C.