If speed of a car becomes 4 times, its kinetic energy becomes -Physics

If speed of a car becomes 4 times, its kinetic energy becomes -Physics
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(c) 16 times
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An object of mass m and velocity v has kinetic energy= 200J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same? -Physics 9th

Description : An object of mass m and velocity v has kinetic energy= 200J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same? -Physics 9th

Last Answer : let the k.e. in first case be x x = 1/2*m*v^2=200j in second case let the kinetic energy be x' v'=v m'=2m x'= 1/2*2m*v^2 x'= 2(1/2*m*v^2) x'=2(x) x'=2*200j x'=400j

A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the kinetic energy of the car -Physics 9th

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Last Answer : The kinetic energy becomes 16 time that of initial kinetic energy Final speed = 4 times of initial speed The kinetic energy of car Where, m = mass of car v = initial velocity of car ... of initial velocity, then kinetic energy Hence, The kinetic energy becomes 16 time that of initial kinetic energy

Can momentum be hidden to human eyes like how kinetic energy can be hidden as heat? -Physics

Description : Can momentum be hidden to human eyes like how kinetic energy can be hidden as heat? -Physics

Last Answer : Yes and no. In a regular mechanical system with macroscopic parts, momentum can not be "hidden" to human eyes. But in other systems, momentum can be hidden. For instance, in an electromagnetic system, ... it is really only hidden to human eyes. We can detect radio waves just fine with an antenna.

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

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Last Answer : Let m1​ and m2​ be the masses of the body Let m1​>m2​Given that m1​v1​=m2​v2​v2​v1​​=m1​m2​​∴ Ratio between their kinetic energies , =K2​K1​​=21​m2​v22​21​m1​v12​​⟹K2​K1​​=m2​m1​​×m12​

A body is moving with velocity 4 m/s , possesses 56 Joules of Kinetic Energy. The momentum of body will be equal to -Physics

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Last Answer : (d) 28 kgms-1

When the speed of a body is doubled, its kinetic energy becomes (a) double (b) half (c) quadruple (d) one-fourth

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Last Answer : Ans:(c)

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

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

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When the velocity of a body is doubled, its 1. acceleration is doubled 2. momentum is doubled 3. kinetic energy becomes four times 4. potential energy is doubled Which of the above is/are correct? (a) 2 only (b) 2 and 3 (c) 3 only (d) 2 and 4

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A car with a mass of 1000 kilogram is moving at a speed of 10 meters per second. The kinetic energy of the car is: w) 100 Joules x) 5000 Joules y) 10,000 Joules z) 50,000 Joules

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Last Answer : ANSWER: Z -- 50,000 JOULES

If the mass of the body is doubled and velocity is made halved, the kinetic energy will become? -Physics 9th

Description : If the mass of the body is doubled and velocity is made halved, the kinetic energy will become? -Physics 9th

Last Answer : New kinetic energy becomes, So, the new kinetic energy of the object gets doubled.

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As a 10 kilogram mass on the end of a spring passes through its equilibrium position, the kinetic energy of the mass is 20 joules. The speed of the mass is: w) 2.0 meters per second x) 4.0 meters per second y) 5.0 meters per second z) 6.3 meters per second

Description : As a 10 kilogram mass on the end of a spring passes through its equilibrium position, the kinetic energy of the mass is 20 joules. The speed of the mass is: w) 2.0 meters per second x) 4.0 meters per second y) 5.0 meters per second z) 6.3 meters per second

Last Answer : ANSWER: W -- 2.0 METERS PER SECOND

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A sphere rolls down on two inclined planes of different angles but same height, it does so – (1) in the same time (2) with the same speed (3) in the same time with the same speed (4) in the same time with the same kinetic energy

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Last Answer : (2) with the same speed Explanation: The velocity of the sphere at the bottom depends only on height and acceleration due to gravity. Both these values are constants. Therefore, the velocity at the bottom ... . The kinetic energy will be the same. What will differ is time taken to reach the bottom.

Kinetic energy depends on – (1) the velocity or speed of the moving body. (2) the mass of the moving body (3) the pressure of the moving body (4) both mass and velocity of the moving body

Description : Kinetic energy depends on – (1) the velocity or speed of the moving body. (2) the mass of the moving body (3) the pressure of the moving body (4) both mass and velocity of the moving body

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A body moving in a circular path with a constant speed has a – (1) constant velocity (2) constant acceleration (3) constant kinetic energy (4) constant displacement

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A body moving in a circular path with a constant speed has a (1) constant velocity (2) constant acceleration (3) constant kinetic energy (4) constant displacement

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Kinetic energy depends on (1) the velocity or speed of the moving body. (2) the mass of the moving body (3) the pressure of the moving body (4) both mass and velocity of the moving body

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A sphere rolls down on two inclined planes of different angles but same height, it does so (1) in the same time (2) with the same speed (3) in the same time with the same speed (4) in the same time with the same kinetic energy

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Last Answer : (2) 4 times

If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by (1) 2 times (2) 4 times (3) 8 times (4) 16 times

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Bernoulli's principle shows that, at points in a moving fluid where the potential energy change is very small A. the pressure is low where the velocity is low and similarly, the pressure is high where the velocity is high B. the pressure is low where the velocity is high and conversely, the pressure is high where the velocity is low C. pressure becomes independent of the velocity of the moving fluid D. pressure remain independent of the speed of the stationary fluid

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Physics calculation- speed of a star?

Description : Physics calculation- speed of a star?

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The refractive indices of four media A, B, C and D are given in the following table: light-reflection-and-refraction-chapter-wise-important-questions-class-10-science-9 If light, travels from one medium to another, in which case the change in speed will be (i) minimum, (ii) maximum? -Physics

Description : The refractive indices of four media A, B, C and D are given in the following table: light-reflection-and-refraction-chapter-wise-important-questions-class-10-science-9 If light, travels from one medium to another, in which case the change in speed will be (i) minimum, (ii) maximum? -Physics

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Description : “The refractive index of diamond is 2.42”. What is the meaning of this statement in relation to speed of light? -Physics

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Description : What is the formula of speed or how to find the Speed of an object ? -Physics

Last Answer : The formula for speed is : speed = distance/time. By this Formula you can find the speed of an body

What is the formula for finding speed? -Physics

Description : What is the formula for finding speed? -Physics

Last Answer : Speed = Total disctance upon Time

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Description : The frequency of a source of sound is 200 hz.How many Times does it vibrate in 2 min? -Physics

Last Answer : Hence, the source vibrates 12000 times in a minute, producing a frequency of 00 Hz.

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Description : During the motion of a projectile fired from the earth surface, ______. (1) its kinetic energy remains constant (2) its momentum remains constant (3) vertical component of its velocity remains constant (4) horizontal component of its velocity remains constant

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Description : When a body falls from an aeroplane, there is increase in its – (1) Kinetic energy (2) Mass (3) Acceleration (4) Potential energy

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Which of the following statements is TRUE about an ELASTIC collision between two particles? Is it true that: w) neither particle loses any of its kinetic energy x) neither particle loses any of its momentum y) the velocity gained by one particle is equal to that lost by the other z) the total kinetic energy before and after the collision remains constant

Description : Which of the following statements is TRUE about an ELASTIC collision between two particles? Is it true that: w) neither particle loses any of its kinetic energy x) neither particle loses any of ... that lost by the other z) the total kinetic energy before and after the collision remains constant

Last Answer : ANSWER: Z -- THE TOTAL KINETIC ENERGY BEFORE AND AFTER THE COLLISION RE

A spring with a force constant of 20 newtons per meter is known to obey Hooke's Law. The spring is attached to a mass of 5 kilograms and placed on a horizontal, frictionless surface. The mass is displaced 3 meters from its equilibrium position and released. What is the kinetic energy of the mass as it passes through its equilibrium position?

Description : A spring with a force constant of 20 newtons per meter is known to obey Hooke's Law. The spring is attached to a mass of 5 kilograms and placed on a horizontal, frictionless surface. The ... and released. What is the kinetic energy of the mass as it passes through its equilibrium position? 

Last Answer : ANSWER: 90 JOULES

A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is: w) all converted into heat x) equal to its potential energy (with respect to the bottom of the plane) when it was at the top of the plane y) less than its kinetic energy at the top of the plane z) dependant on the materials of which the block is made

Description : A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is: w) all converted into heat x) equal to its ... kinetic energy at the top of the plane z) dependant on the materials of which the block is made 

Last Answer : ANSWER: X -- EQUAL TO ITS POTENTIAL ENERGY (WITH RESPECT TO THE BOTTOM OF PLANE) WHEN IT WAS AT THE TOP OF THE PLANE.

The kinetic energy of a stone falling near the earth's surface through a vacuum increases with the: w) square root of its velocity x) cube root of its velocity y) square of its velocity z) cube of its velocity

Description : The kinetic energy of a stone falling near the earth's surface through a vacuum increases with the: w) square root of its velocity x) cube root of its velocity y) square of its velocity z) cube of its velocity

Last Answer : ANSWER: Y -- SQUARE OF ITS VELOCITY

During the motion of a projectile fired from the earth surface, _______ (1) its kinetic energy remains constant (2) its momentum remains constant (3) vertical component of its velocity remains constant (4) horizontal component of its velocity remains constant

Description : During the motion of a projectile fired from the earth surface, _______ (1) its kinetic energy remains constant (2) its momentum remains constant (3) vertical component of its velocity remains constant (4) horizontal component of its velocity remains constant

Last Answer : horizontal component of its velocity remains constant

When a body falls from an aeroplane, there is increase in its (1) Kinetic energy (2) Mass (3) Acceleration (4) Potential energy

Description : When a body falls from an aeroplane, there is increase in its (1) Kinetic energy (2) Mass (3) Acceleration (4) Potential energy

Last Answer : Acceleration

If kinetic energy of a kg mass is J what is its speed?

Description : If kinetic energy of a kg mass is J what is its speed?

Last Answer : Need answer

What kind of physics does a police officer need for investigating car accidents?

Description : What kind of physics does a police officer need for investigating car accidents?

Last Answer : K=½mv² is about as complex as it gets for either. Physics isn’t the hard part about forensics though.

A car is moving in a straight path. What is the motion of the car? -Physics

Description : A car is moving in a straight path. What is the motion of the car? -Physics

Last Answer : Rectilinear motion or straight line motion

What is the sum of the kinetic energy and potential energy of the molecules of matter called energy ?

Description : What is the sum of the kinetic energy and potential energy of the molecules of matter called energy ?

Last Answer : The sum of the kinetic and potential energy of the molecules of matter is called internal energy.

On which does Kinetic Energy depend?

Description : On which does Kinetic Energy depend?

Last Answer : – Both mass and velocity of the moving body

A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum: (1) just after it is dropped (2) when it is just on the half-way (3) just before it touches the ground (4) when it touches the ground

Description : A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum: (1) just after it is dropped (2) when it is just on the half-way (3) just before it touches the ground (4) when it touches the ground

Last Answer : (3) just before it touches the ground Explanation: When an object reaches the ground it has its maximum value of kinetic energy just before touching the ground. Since kinetic energy + potential energy ... energy of an object becomes zero (0). The kinetic energy on reaching ground becomes maximum.

In a water lifting electric pump, We convert – (1) Electrical energy into Potential energy (2) Kinetic energy into Electrical energy (3) Kinetic energy into Potential energy (4) Electrical energy into Kinetic energy

Description : In a water lifting electric pump, We convert – (1) Electrical energy into Potential energy (2) Kinetic energy into Electrical energy (3) Kinetic energy into Potential energy (4) Electrical energy into Kinetic energy

Last Answer : (1) Electrical energy into Potential energy Explanation: In a water lifting electric pump, we convert electrical energy into potential energy. In hydraulic pump mechanical energy in converted into potential energy

The temperature of a body is an indicator of – (1) The total energy of the molecules of the body (2) The average energy of the molecules of the body (3) The total velocity of the molecules of the body (4) The average kinetic energy of the molecules of the body

Description : The temperature of a body is an indicator of – (1) The total energy of the molecules of the body (2) The average energy of the molecules of the body (3) The total velocity of the molecules of the body (4) The average kinetic energy of the molecules of the body

Last Answer : (4) The average kinetic energy of the molecules of the body