Description : A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments – (1) is zero (2) depends on the total mass of all the fragments (3) depends on the speeds of various fragments (4) is infinity
Last Answer : (1) is zero Explanation: In an explosion, an internal impulse acts in order to propel the parts of a system (often a single object) into a variety of directions. After the explosion, the individual parts of the system (that is often a collection of fragments from the original object) have momentum.
Description : A bomb, initially at rest, explodes into a large number of tiny fragments. The total momentum of all the fragments (a) Is zero (b) Is infinity (c) Depends on the total mass of all the fragments (d) Depends on the speeds of various fragments
Last Answer : Ans:(a)
Description : A shell, initially at rest suddenly explodes into two equal fragments A and B. Which one of the following is observed? (a) A and B move in the same direction with the same speed (b) A ... move in opposite directions with the same speed (d) A and B move in opposite directions with different speeds
Last Answer : Ans:(c)
Description : If a bomb dropped from an airplane explodes in mid-air _______. (1) its KE increases (2) its total energy increases (3) its total energy decreases (4) its total momentum decreases
Last Answer : (1) its KE increases Explanation: The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
Description : A firecracker is placed in the middle of a cluster of stationary billiard balls. The firecracker-billiard ball system sits on a frictionless surface. As the firecracker explodes, the balls scatter. What is the momentum ... to the combined speed of the balls y) equal to the mass of the balls z) zero
Last Answer : ANSWER: Z -- ZERO
Description : A spring ball of mass 0.5 kg is dropped from some height. On falling freely for 10 s, it explodes into two fragments of mass ratio 1:2.
Last Answer : A spring ball of mass 0.5 kg is dropped from some height. On falling freely for 10 s, ... m/s. Calculate the kinetic energy supplied during explosion.
Description : A bomb explodes on the moon. You will hear its sound on earth after – (1) 20 minutes (2) 2 hours 20 minutes (3) 3.7 hours (4) You cannot hear the sound of explosion
Last Answer : (4) You cannot hear the sound of explosion Explanation: The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves ... Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.
Description : A bomb explodes on the moon. You will hear its sound on earth after ______ (1) 20 minutes (2) 2 hours 20 minutes (3) 3.7 hours (4) You cannot hear the sound of explosion
Last Answer : You cannot hear the sound of explosion
Description : There are 10 bombs on the ground, 1 bomb explodes. How many bombs are there left? -Riddles
Last Answer : None. Because when that 1 bomb exploded, it caused the rest of the Bombs to explode too.
Description : A bomb explodes on the moon. You will hear its sound on earth after ___
Last Answer : ou cannot hear the sound of explosion 514.
Description : A bomb explodes on the Moon. How long will it take for the sound to reach the Earth? (a) 10 s (b) 1,000 s (c) 1 day (d) None of these
Last Answer : Ans:(d)
Description : A particle of mass m is moving along a straight path through the origin of coordinates with a velocity v. The angular momentum of the particle about the origin (a) mv (b) Depends on its distance from origin (c) Is zero (d) Changes from positive to negative as it passes through the origin
Description : Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line? (1) Momentum (2) Mass (3) Force (4) Inertia
Last Answer : (3) Force Explanation: Force is an agent which changes or tends to change the state of rest or of uniform motion of a body.
Description : An object in equilibrium always has zero: w) velocity x) momentum y) mass z) acceleration.
Last Answer : ANSWER: Z -- ACCELERATION
Description : If the resultant force acting on a body of constant mass is zero, the body's momentum is: w) increasing x) decreasing y) always zero z) constant
Last Answer : ANSWER: Z -- CONSTANT
Description : Total momentum within a closed system is A. increasing B. decreasing C. zero D. constant
Last Answer : constant
Description : If the total kinetic energy and momentum of a system becomes zero after collision, then the collision is A. elastic B. inelastic C. conserved D. not conserved
Last Answer : inelastic
Description : Which of the following statements dealing with simple harmonic motion of a mass-spring system is TRUE? w) The acceleration is largest when the oscillating mass is instantaneously at rest. x) The ... of the motion. z) The acceleration is larger when the oscillating mass has its greatest velocity.
Last Answer : ANSWER: W -- THE ACCELERATION IS LARGEST WHEN THE OSCILLATING MASS IS INSTANTANEOUSLY AT REST
Description : If two different gases have the same volume, temperature, and pressure and behave like ideal gases, they will also be identical in which one of the following ways? w) average molecular velocity x) total mass y) total molecular kinetic energy z) average momentum per molecule
Last Answer : ANSWER: Y -- TOTAL MOLECULAR KINETIC ENERGY
Description : In an isolated system two cars each with a mass of 1000 kg collide car 1 is initially at rest while car 2was moving at10ms what is the magnitude of their combined momentum after the collision?
Last Answer : What is the answer ?
Description : In an isolated system two cars each with a mass of 1500 kg collide car 1 is initially at rest while car 2 was moving at 5ms. What is their combined momentum after collision?
Last Answer : Need answer
Description : If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same - (1) velocity (2) momentum (3) acceleration (4) kinetic energy
Last Answer : (2) momentum Explanation: If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same momentum.
Description : A box is initially at rest on a horizontal, frictionless table. If a force of 10 Newtons acts on the box for 3 seconds, what is the momentum of the box at the end of the 3 second interval?
Last Answer : ANSWER: 30 NEWTON-SECONDS or 30 KILOGRAM-METER PER SECOND
Description : The response of an Undamped system under resonance will be a. very large b. infinity c. zero
Last Answer : b. infinity
Description : The focal length of a plane mirror is (1) Positive (2) Negative (3) Zero (4) Infinity
Last Answer : (4) Infinity Explanation: A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
Description : When temperature rises, resistance of negative temperature coefficient thermistor A. increases B. decreases C. zero D. infinity
Last Answer : decreases
Description : If charge is placed at infinity, it's potential is A. zero B. infinite C. 1 D. -1
Last Answer : zero
Description : Gravitational potential is always A. positive B. negative C. zero D. infinity
Last Answer : negative
Description : The caper: useless little ball of brine or tiny charming flavor bomb?
Last Answer : Boy, do I have a head cold! It took me a while to figure out what kind of caper you were on! I had one recipe for a cold roast beef that had a caper mustard sauce; I thought the capers added some color and flavor. Still probably have some in a jar from 20 years ago.
Description : What is the reflux ratio at total reflux? (A) Zero (B) Infinity (C) Unity
Last Answer : (B) Infinity
Description : An object is projected vertically upward near the surface of the earth. At the very top of its path, the object's velocity is zero, and its acceleration is: w) 0 x) 9.8 meters per second squared DOWNWARD y) 9.8 meters per second squared UPWARD z) depends on the mass of the object
Last Answer : ANSWER: X -- 9.8 METERS PER SECOND SQUARED DOWNWARD
Description : When net torque is zero, will be constant - (1) force (2) angular momentum (3) linear momentum (4) acceleration
Last Answer : (2) angular momentum Explanation: Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Description : Momentum of two objects moving with same speed but in opposite direction upon collision is A. increased B. decreased C. is zero D. is infinite
Last Answer : is zero
Description : In a perfectly elastic collision, momentum and energy are A. not conserved B. conserved C. becomes zero after collision D. equal before collision
Last Answer : conserved
Description : An object travelling with constant velocity has A. constant momentum B. zero momentum C. increasing momentum D. decreasing momentum
Last Answer : constant momentum
Description : Why are download speeds in America so slow compared to the rest of the world?
Last Answer : Removed by Ask-public moderators.
Description : In planetary motion a.The total angular momentum remains constant b.The total linear momentum remains constant c.The total linear momentum is zero d.The total angular momentum is zero e.None of the above
Last Answer : a. The total angular momentum remains constant
Description : Am I a science student ? I am a science student. I want to buy a tablet for 4G speeds , the screen will be a little bigger for watching and studying various educational videos on youtube , for taking live ... be better for this ? What to buy ? Which company will I buy and what will be the price ?
Last Answer : answer:
Description : Will I take SSC exam next year ? I am a science student. I want to buy a tablet for 4G speeds , the screen will be a little bigger for watching and studying various educational videos on youtube , for ... be better for this ? What to buy ? Which company will I buy and what will be the price ?
Last Answer : All the models of Symphony are good. But if you say which is the best , I am confused about it. Because everyone speaks one by one. Many of my classmates and I are using different models of Symphony. You can use any one.
Description : Two objects A and B are moving with same momentum. Mass of object 'B' is greater then mass of object 'A'. Which of the two object will have higher kinetic energy? -Physics
Last Answer : Let m1 and m2 be the masses of the body Let m1>m2Given that m1v1=m2v2v2v1=m1m2∴ Ratio between their kinetic energies , =K2K1=21m2v2221m1v12⟹K2K1=m2m1×m12
Description : A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that - ... change in momentum (4) The initial momentum of the rubber ball is greater than that of the metal ball
Last Answer : (1) The rubber ball suffers greater change in momentum
Description : The working of a rocket is based on the principle of: (1) Conservation of momentum (2) Conservation of mass (3) Conservation of energy (4) Conservation of angular momentum
Last Answer : (1) Conservation of momentum Explanation: The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired ... rocket acquires a momentum of equal magnitude in opposite direction. Thus the rocket moves upwards.
Description : A jet engine works, on the principle of conservation of - (1) linear momentum (2) angular momentum (3) energy (4) mass
Last Answer : (1) linear momentum Explanation: Linear momentum is a vector quantity defined as the product of an object's mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called ... for short: Note that a body's momentum is always in the same direction as its velocity vector.
Description : Which conservation principle is applicable in the case of the motion of a rocket? (1) Conservation of mass (2) Conservation of charge (3) Conservation of momentum (4) Conservation of energy
Last Answer : (3) Conservation of momentum Explanation: The motion of a rocket is an application of Newton's third law of motion and law of conservation of linear momentum. The operation of a rocket illustrates the ... rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle.
Description : A rocket works on the principle of conservation of ______. (1) mass (2) linear momentum (3) energy (4) angular momentum
Last Answer : (2) linear momentum Explanation: A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
Description : Mass and velocity are combined to give A. angular momentum B. equilibrium C. acceleration D. linear momentum
Last Answer : linear momentum
Description : Direction of momentum is direction of object's A. mass B. acceleration C. velocity D. frictional force
Last Answer : velocity
Description : Momentum of electron having mass 9.1 × 10-31 kg and velocity 2.0 × 107 is A. 1.91 × 10-23 B. 2.34 × 10-23 C. 3.11 × 10-19 D. 7.88 × 10-34
Last Answer : 1.91 × 10-23
Description : When a mass is rotating in a plane about a fixed point, its angular momentum is directed along: (1) the tangent to the orbit (2) a line perpendicular to the plane of rotation (3) the line making an angle of 45° to the plane of rotation (4) the radius
Last Answer : (2) a line perpendicular to the plane of rotation