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Syllabus

give 7 examples of inertia of rest with explanation

_{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.How to find the least count of a spring balance?

give examples of inertia of direction with explanation

how many types of inertia are there name them

centripetal force is required for a body to move on a circular path. what provides this force to the moon to move around the earth ? write an expression for it.

define one newton force

Answer Quick

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!

Show that Newton's first law of motion is contained in second law ?

if a man jumps out from a boat , the boat moves backwards . why?

what is relation between the newton and dyne ?

while riding on a bicycle if we stop pedaling why does the bicycle begin to slow down

Derive the equation for the conservation of momentum

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.

because :

(i) Zero error of the spring balance was ignored by Shreeya.

(ii) Shreeya pressed the cuboid hard on the sand.

(iii) Shreeya forgot to level the sand after every reading.

(iv) The least count was not correctly noted.

(a) only (i) (b) only (ii)

(c) only (iii) (d) all the options (i),(ii),(iii) and (iv)

name and define three different types of inertia and give an example each

solution for science activity 9.5 for class 9

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.why it is nessery to run along with a moving bus and in the same direction of bus, while alighting from it?

Define force and write its si. Unit

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

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

why are road accidents at high speed are very much worse than accidents at low speed???

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)

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.

what is the direction of resultant force on a particle that moves with a uniform speed in a circular path of radius R ??

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

^{2}).a) 50 cm*30 cm

b) 30 cm* 20 cm

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

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).

1.Which will have greater inertia. 2.which will have greater momentum. 3.which will stop if equal negative acceleration is applied to both. 4.which will travel greater distance which Will impart greater impulse if collides with the wall.

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 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

Explain recoiling of gun with

third law of motion?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

Why shockers are provided in automobile vehicles?A

B

C

D

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?

The following is the distance-time table of an object in motion:

Time in secondsDistance in metres0

0

1

1

2

8

3

27

4

64

5

125

6

216

7

343

(a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?

(b)What do you infer about the forces acting on the object?

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.....

Define: INERTIA

a car weighing 1600kg moving with a velocity of 30m/s retards uniformly coming to rest in 20s.calulate the a)initial momentum of the car.b)final,momentum of the car.c)rate of change of momentum.d)acceleration of the car.e)magnitude of the force applied?

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?

a conducting circular loop of radius r carries a constant current i. it is placed in a uniform magnetic field b such that b is perpendicular to plane of loop.the magnetic force acting on loop..

can someone plz tell me the derivations of equations of motions without graph ..

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?

why chinaware is wrapped in straw while transportation?

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.

Why does an air filled balloon rise up slightly when punctured from below?

A gunman gets a jerk on firing a bullet.why??

^{-2}, ms^{-1}, Kg ms^{-1}, ms^{-2}.which one of the above can be used for measuring momentum of an object ? Writ the physical quantity that needs to be varied if the momentum of a body of a given mass has to be changed.

action and reaction forces do not balance each other. why?

Few examples of balanced and unbalanced force?

why is it difficult to balance our body when we accidentally step on a peel of banana give reasons

What are the effects of the following on inertia of a body?

a) If force is doubled

b) If density is halved

c)If weight is reduced by three times

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.what is measure of inertia of a body in linear motion???

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.A Scooter is moving with a velocity of 20m/s when brakes are applied. The mass of the scooter and the rider is 180kg.The constant force applied by the brakes is 500N.

a) How long should the brakes be applied to make the scooter comes to halt?

b)How far does the scooter travel before it comes to rest?

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?

prove through a derivation that p = mv $ what is an impulse in physics??????

When a carpet is beaten with a stick dust comes out. why?

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....

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})from a station x a train starts from rest and attains a speed of 54km/h in 10s,then with this uniform speed it moves for 8 min and then by applying brakes it stops at station y in 6s . find the distance between station x and y?