An ice cream has a marked value of 700 kcal. How many kilowatt- hour of energy will it deliver to the body as it is digested 

(1) 0.81 kWh

(2) 0.90 kWh

(3) 1.11 kWh

(4) 0.71 kWh

Concept Questions :-

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A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by 1m/s so as to have same K.E. as that of the boy. The original speed of the man will be 

(1) 2m/s

(2) (21)m/s

(3) 1(21)m/s

(4) 12m/s 

Concept Questions :-

Concept of work
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A particle of mass m at rest is acted upon by a force F for a time t. Its Kinetic energy after an interval t is 

(1) F2t2m

(2) F2t22m

(3) F2t23m

(4) Ft2m

Concept Questions :-

Concept of work
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Two bodies of masses m and 4 m are moving with equal K.E. The ratio of their linear momentums is

(1) 4 : 1

(2) 1 : 1

(3) 1 : 2

(4) 1 : 4

Concept Questions :-

Concept of work
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A particle of mass m1 is moving with a velocity v1 and another particle of mass m2 is moving with a velocity v2. Both of them have the same momentum but their different kinetic energies are E1 and E2 respectively. If m1 > m2 then 

(1) E1 < E2

(2) E1E2=m1m2

(3) E1 > E2

(4) E1 = E2

Concept Questions :-

Concept of work
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Four particles are given, having same momentum. Which one has maximum kinetic energy- 

(1) Proton

(2) Electron

(3) Deutron

(4) α-particles

Concept Questions :-

Concept of work
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If a man increase his speed by 2 m/s , his K.E. is doubled, the original speed of the man is 

(1) (1+22)m/s

(2) 4 m/s

(3) (2+22)m/s

(4) (2+2)m/s 

Concept Questions :-

Concept of work
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A block of mass m initially at rest is dropped from a height h on to a spring of force constant k. the maximum compression in the spring is x then [BCECE 2005]

(1) mgh=12kx2

(2) mg(h+x)=12kx2

(3) mgh=12k(x+h)2

(4) mg(h+x)=12k(x+h)2

Concept Questions :-

Elastic potential energy
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A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It slides down a smooth surface to the ground, then climbs up another hill of height 30 m and finally slides down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is 

(1) 10 m/s

(2) 1030 m/s

(3) 40 m/s

(4) 20 m/s

Concept Questions :-

Gravitational Potential energy
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The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant K and compresses it by length L. The maximum momentum of the block after collision is 

(1) Zero

(2) ML2K

(3) MKL

(4) KL22M

Concept Questions :-

Elastic potential energy
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