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Pushkar Mahto
Subject: Science
, asked on 11/10/17
The speed of the car (maas 2000 kg) increases from 54 km/hr to 72 km/hr. What is the change in momentum?
Answer
2
Aryan
Subject: Science
, asked on 7/10/17
8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N lto calculate force of wagon1 on wagon 2 they calculate the mass of 4 wagon pls dont send a link i saw all links i know answer but i just want a detailed reason that why we need to add mass of 4 wagons not only the mass of wagon2 . we need only the force on wagon 2 what we will do with 4 wagons i am not able to understand pls give a detailed good answer good answer so that i can understand
Answer
1
Varsha Tiwari
Subject: Science
, asked on 5/10/17
7. The velocity of a body of mass 10 kg increases from 5 m/s to 8 m/s when a force acts on it for 2 sec. a) What is the momentum before the force acts? b) What is the momentum after the force acts? c) What is the gain in momentum per second? d) What is the value of force? 8. A stone is allowed to fall from a top of a tower 100 m high and at the same time another stone projected vertically upwards from the ground with the velocity of 25 m/s. Calculate when and where the two stones will meet.
Answer
1
Varsha Tiwari
Subject: Science
, asked on 5/10/17
3. On the earth, a stone is thrown from a height in a direction parallel to the earth surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why? 4. A hammer of mass 500gm moving at 50 m/s strikes a nail .The nail stops the hammer in a very short time of 0.01sec. What is the force of nail on the hammer? 5. A man throws a ball of mass 500 gm vertically upwards with a velocity of 25 m/sec. Find a) The initial momentum of the ball. b) Momentum of the ball at the half way mark of the maximum height. (g=10 m/s2 ) 6. Derive the relation between force and acceleration using second law of motion. A bullet of log strikes a sand bag at a speed of 103 m/s and gets embedded after travelling 5 cm. Calculate: i) The resistive force exerted by the sand in the bullet. ii) The time taken by the bullet to come to rest.
Answer
1
Varsha Tiwari
Subject: Science
, asked on 5/10/17
1. Starting from a stationary position, Ashmit paddles his bicycle to attain velocity of the bicycle comes down to 4 m/s in the next 5 sec. Calculate the acceleration of the bicycle in both cases.
2. A bullet of mass 20 gm is fired horizontally with a velocity of 150 m/sec from a pistol of mass 2 kg .What is the recoil velocity of pistol?
Answer
3
Isha Saini
Subject: Science
, asked on 4/10/17
Plz answer fast....
Q.8. State Newton's second law of motion and prove that Newton's first law of motion is a special case of Newton's second law of motion.
Answer
3
R. Lasyapriya
Subject: Science
, asked on 4/10/17
how to find out the least acceralation the q uestion is there in the picture
Answer
3
Prateek Sharma
Subject: Science
, asked on 18/9/17
Q the spring balance used to measure minimum force required to just move a wooden block is of range 0-100g wt and has 100 divisions on its scale. when the block just started moving the pointer was at 65th division the force at this point is
(A) 650 g wt
(B) 65 g wt
(C) 6.5 g wt
(D) 35 g wt
Answer
1
Narottam Meena
Subject: Science
, asked on 2/10/17
give me 20
survey question
on energy conservation only
survey question
Answer
1
Palak Sureka
Subject: Science
, asked on 2/10/17
Two particles of equal mass (m) move in a circle of radius( r) under the action of their mutual gravitational attraction .Find the speed of each particle.
Answer
1
Palak Sureka
Subject: Science
, asked on 1/10/17
Two particles of equal mass (m) move in a circle of radius( r) under the action of their mutual gravitational attraction .Find the speed of each particle.
Answer
1
Palak Sureka
Subject: Science
, asked on 1/10/17
Two identical copper spheres of radius R are in contact with each other. If the gravitational attraction between them is F, find the relation between F and R.
Answer
1
Zainab
Subject: Science
, asked on 30/9/17
deivation of law ofconservation of momentum in easy way
Answer
3
Sanjay
Subject: Science
, asked on 30/9/17
Solve this:
Answer
3
Palak Sureka
Subject: Science
, asked on 30/9/17
A stone dropped from a window reaches the ground in 0.5 seconds (given g = 10 m/s2).
a) Calculate the speed just before it hits the ground.
b) What is the average speed at t=0.5 s?
c) Calculate the height of window from the ground
Answer
2
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2. A bullet of mass 20 gm is fired horizontally with a velocity of 150 m/sec from a pistol of mass 2 kg .What is the recoil velocity of pistol?

Q.8. State Newton's second law of motion and prove that Newton's first law of motion is a special case of Newton's second law of motion.

(A) 650 g wt

(B) 65 g wt

(C) 6.5 g wt

(D) 35 g wt

on energy conservation onlysurvey questionsurvey questiona) Calculate the speed just before it hits the ground.

b) What is the average speed at t=0.5 s?

c) Calculate the height of window from the ground