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Q1. If the potential energy of the particle is ­? - ?/2 x2, then force experienced by the particle is

(a) F=?/2 x2
(b) F=?x
(c) F=-?x
(d) F=-?/2 x2

Q2. If the linear momentum of the object is increased by 0.1%, then the kinetic energy is increased by

(a) 0.1 %
(b) 0.20%
(c) 0.40%
(d) 0.01%

Q3. The work done by the conservative force for a closed path is

(a) always negative
(b) zero
(c) always positive
(d) not defined

Q4. What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?.

(a) ?(2gR)
(b) ?(3gR)
(c) ?(5gR)
(d) ?(gR)

Q5. The potential energy of a system increases, if work is done

(a) by the system against a conservative force
(b) by the system against a non-conservative force
(c) upon the system by a conservative force
(d) upon the system by a non-conservative force

Q6. A body of mass 4 m is lying in xy-plane at rest. It suddenly explodes into three pieces. Two pieces each of mass m move perpendicular to each other with equal speed v. The total kinetic energy generated due to explosion is

(a) mv2
(b) 3/2 mv2
(c) 2mv2
(d) 4mv2

Q7. An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water of the jet. What is the rate at which kinetic energy is imparted to water ?

(a) ½ mv2
(b) mv2
(c) ½ mu2
(d) mu2

Q8. A body of mass 1 kg is thrown upwards with a velocity 20 m s?1. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction?. (Take g= 10ms-2 )

(a) 20 J
(b) 30 J
(c) 40 J
(d) 10 J

Q9. A ball of mass 1 kg and another of mass 2 kg are dropped from a tall building whose height is 80 m. After, a fall of 40 m each towards Earth, their respective kinetic energies will be in the ratio of

(a) ?2 : 1
(b) 1 : ?2
(c) 2 : 1
(d) 1 : 2

Q10. A uniform force of (2iˆ+ ˆj) N acts on a particle of mass 1 kg. The particle displaces from position (3 ˆj + ˆk ) m to (5iˆ­+3ˆj) m. The work done by the force on the particle is

(a) 9 J
(b) 6 J
(c) 10 J
(d) 12 J


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736 views

A Block Of Mass 5kg Is Resting On A Smooth Surface. At What Angle A Force Of 20N Be Acted On The Body So That It Will Acquired A Kinetic Energy Of 40J After Moving 4m.

Modified 234 Year Ago

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234 Year Ago

A Block Of Mass 5kg Is Resting On A Smooth Surface. At What Angle A Force Of 20N Be Acted On The Body So That It Will Acquired A Kinetic Energy Of 40J After Moving 4m.

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0 Answer
717 views

A Mass Of M Kg Is Suspended By A Weightless String. The Horizontal Force That Is Required To Displace It Until The String Makes An Angle Of 45° With The Initial Vertical Direction Is

Modified 17 Year Ago

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17 Year Ago

A Mass Of M Kg Is Suspended By A Weightless String. The Horizontal Force That Is Required To Displace It Until The String Makes An Angle Of 45° With The Initial Vertical Direction Is

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678 views

A Ball Is Dropped From Height 20 M. If Coefficient Of Restitution Is 0.9 What Will Be The Height Attained After First Bounce?

Modified 17 Year Ago

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678
17 Year Ago

A Ball Is Dropped From Height 20 M. If Coefficient Of Restitution Is 0.9 What Will Be The Height Attained After First Bounce?

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0 Answer
503 views

A 50kg Man With 20kg Load On His Head Climbs Up 20 Steps Of 0.25m Height Each

Modified 204 Year Ago

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503
204 Year Ago

A 50kg Man With 20kg Load On His Head Climbs Up 20 Steps Of 0.25m Height Each

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499 views

A Particle Of Mass 100g Thrown Vertically Upwards With A Speed Of 5m/s.

Modified 234 Year Ago

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234 Year Ago

A Particle Of Mass 100g Thrown Vertically Upwards With A Speed Of 5m/s.

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0 Answer
472 views

If Force And Displacement Of Particle In Direction Force Are Doubled.Work Would Be

Modified 234 Year Ago

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234 Year Ago

If Force And Displacement Of Particle In Direction Force Are Doubled.Work Would Be

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