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(b) 2s
(c) going up with uniform speed
(b) 486 J
(b) 1200 litres
(a) e2 h
(a) 135
(d) 1:4
(c) Total linear momentum
(c) 100 J
(b) 5m s⁻¹
An object, moving with a speed of 6.25 m/s, is decelerated at a rate given By dv/dt=-2.5√v Where V is the instantaneous speed. The time taken by the object, to come to rest would be
(b) 2s
(b) 2s
See lessIf the tension in the cable supporting an elevator is equal to the weight of elevator, the elevator my be
(c) going up with uniform speed
(c) going up with uniform speed
See lessA bomb of mass 30 kg at rest explodes in to two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms⁻¹. The kinetic energy of the other mass is
(b) 486 J
(b) 486 J
See lessHow much water a pump of 2 KW can raise in one minute to a height of 10 m? (g = 10 ms)?
(b) 1200 litres
(b) 1200 litres
See lessA ball is dropped from height ‘h’ on the ground where co-efficient of restitution is ‘e’. After one bounce the maximum height is
(a) e2 h
(a) e2 h
See lessA position dependent force, F = 7 – 2x + 3x² N acts on a small body of mass 2 kg and displaces it from x = 0 to x = 5 m. The work done in joule is
(a) 135
(a) 135
See lessTwo bodies with kinetic energies in the ratio 4 : 1 are moving with equal linear momentum. The ratio of their masses is
(d) 1:4
(d) 1:4
See lessDuring inelastic collision between two bodies, which of the following quantities always remain conserved
(c) Total linear momentum
(c) Total linear momentum
See less300 J of work is done in sliding a 2 kg block up on inclined plane of height 10 m. Work done against friction is (g = 10 ms–²)
(c) 100 J
(c) 100 J
See lessA child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respectively, it’s maximum speed will be
(b) 5m s⁻¹
(b) 5m s⁻¹
See less