APEX INSTITUTE : WORK ENERGY ASSIGNMENT FOR FOUNDATION BATCH
Saturday, August 16, 2014
WORK ENERGY ASSIGNMENT FOR FOUNDATION BATCH
A spring with spring constant K when stretched through 2cm
the potential energy is U. If it is stretched by 6cm. The potential energy will
be......
If linear momentum of body is increased by 1.5%, its
kinetic energy increases by.......%?
With what velocity should a student of mass 40 kg run so
that his kinetic energy becomes 160 J ?
A body of mass 1 kg is thrown upwards with a velocity 20
m/s. It momentarily comes to rest after a height 18m. How much energy is lost
due to air friction? (g = 10 m/s2)
Two bodies of masses m1 and m2 have equal kinetic
energies. If P1 and P2 are their respective momentum,
what is ratio of P2 : P1 ?
A body having a mass of 0.5 kg slips along the wall of a semi
spherical smooth surface of radius 20 cm shown in figure. What is the velocity
of body at the bottom of the surface?
Two bodies of masses m and 3m have same momentum. their
respective kinetic energies E1 and E2 are in the
ratio.....
What is the velocity of the bob of a simple pendulum at
its mean position, if it is able to rise to vertical height of 18 cm (Take g =
10 m/s2)
If the K.E. of a body is increased by 44%, its momentum
will increase by....... (A) 20 %
(B) 22 % (C) 2 % (D) 120 %
A spherical ball of mass 15 kg stationary at the top of a
hill of height 82m. It slides down a smooth surface to the ground, then climbs
up another hill of height 32m and finally slides down to horizontal base at a
height of 10 m above the ground. The velocity attained by the ball is
A bomb of mass 10 kg explodes into 2 pieces of mass 4 kg
and 6 kg. The velocity of mass 4 kg is 1.5 m/s, the K.E. of mass 6 kg is.......(A) 3.84 J (B) 9.6 J (C) 3.00 J (D) 2.5 J
If the water falls from a dam into a turbine wheel 19.6m
below, then the velocity of water at the turbine is ...... ( g = 9.8 m/s2) (A) 9.8 m/s (B) 19.6 m/s (C) 39.2 m/s (D) 98.0 m/s
A bomb of 12 kg divides in two parts whose ratio of
masses is 1:4. If kinetic energy of smaller part is 288 J, then momentum of
bigger part in kgm/sec will be(A) 48 (B) 72 (C) 108 (D) Data is incomplete
A bomb of mass 3.0 g explodes in air into two pieces of
masses 2.0 kg and 1.0 kg. The smaller mass goes at a speed of 80m/s. The total
energy imparted to the two fragments is (A) 1.07 KJ (B) 2.14 KJ (C) 2.4 KJ (D) 4.8 KJ
A gun fires a bullet of mass 40 g with a velocity of 50
m/s. Because of this the gun is pushed back with a velocity of 1 m/s. The mass
of the gun is (A) 1.5 kg (B) 3 kg (C) 2 kg (D) 2.5 kg
The decreases in the potential energy of a ball of mass
25 kg which falls from a height of 40 cm is (A) 968 J (B) 100 J (C) 1980 J (D) 200 J
If a man increase his speed by 2 m/s, his K.E. is
doubled, the original speed of the man is?
If the force F is applied on a body and it moves with a
velocity v, the power will be?
A ball is allowed to fall from a height 20m. If there is
30% loss of energy due to impact, then after one impact ball will go up to (A) 18 m (B) 16 m (C) 12 m (D) 14 m
If a skater of weight 4 kg has initial speed 40 m/s and 2nd
one of weight 6 kg has 6 m/s. After collision, they have speed (couple) 6 m/s.
Then the loss in K.E. is..... (A) 48 J (B) zero (C) 96 J (D) None of these
A metal ball of mass 2 kg moving with a velocity of 36
km/h has a head on collision with a stationary ball of mass 3 kg. If after the
collision, the two balls move together, the loss in kinetic energy due to
collision is (A) 40 J (B) 60 J (C) 100 J (D) 140 J
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