21
A disc of mass 4 kg, radius 0.5m and moment of inertia 3 kg-m2 rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is
Answer: 200 J
Questions
22
When a circular wheel rolls on a straight track, then the shape of body centrode and space centrode respectively are
Answer: circle and straight line
23
At the instantaneous center, the velocity of the moving lamina at any instant is
Answer: 464 J
24
For a given velocity of a projectile, the range is maximum when the angle of projection is
Answer: 45°
25
A stone is thrown vertically upwards with a vertical velocity of 49 m/sec. It returns to the ground in
Answer: 10 sec
26
If a projectile is fired with an initial velocity of 10 m/sec at an angle of 60° to the horizontal, its horizontal and vertical velocity at the highest point of trajectory are
Answer: 5 m/sec and 0
27
In a simple harmonic motion, the position of equilibrium is always
Answer: Stable
28
If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is
Answer: proportional to A2
29
A particle of mass 2 kg executes simple harmonic motion of frequency 6/71 Hz and amplitude 0.25 m. Its maximum kinetic energy is
Answer: 9.0 J
30
If the kinetic energy and potential energy of a simple harmonic oscillator of amplitude A are both equal to half the total energy, then the displacement is equal to
Answer: A/V2
31
Time period and length of a seconds pendulum respectively are
Answer: 2 sec and 99.4 cm
32
A particle is executing simple harmonic motion in a line 1.0 m long. If the time of one complete vibration is 1 sec, then the maximum velocity of the particle is
Answer: 3.14 m/sec
38
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium if
Answer: both floor and wall are smooth
