1) a force is required to move the body upwards
2) a force is required to move the body downward
3) the body will not be in equilibrium
The correct answer is?
If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is_____________________?
A. —rad/sec 10
B. —rad/sec 20
C. —rad/sec 30
D. none of the above
In a simple harmonic motion, the position of equilibrium is always_________________?
A. stable
B. unstable
C. neutral
D. none of the above
In SI units, the units of force and energy are respectively___________________?
A. Newton and watt
B. Dyne and erg
C. Newton and joule
D. kg-wt and joule
Instantaneous center is at infinity when the angular velocity is _________________?
A. constant
B. zero
C. maximum
D. minimum
In which of the following trusses, the method of substitution is required for determining the forces in all the members of the truss by graphic statics ?
A. howe truss
B. king post truss
C. fink truss
D. warren truss
Intrinisic equation of catenary is given by____________________?
A. S = C tan q>
B. S = C cos cp
C. S = C sin cp
D. S = C cot <p
In a lifting machine a weight of 5 kN is lifted through 200 mm by an effort of 0.1 kN moving through 15 m. The mechanical advantage and velocity ratio of the machine are respectively_____________________?
A. 50 and 75
B. 75 and 50
C. 75 and 75
D. 50 and 50
Impulse can be obtained from a_________________?
A. force-displacement diagram
B. force-time diagram
C. velocity-time diagram
D. velocity-displacement diagram
If the angular distance, 0 = 2t3 – 3t2, the angular acceleration at t = 1 sec. is__________________?
A. 1 rad/sec2
B. 4 rad/sec2
C. 6 rad/sec2
D. 12 rad/sec2
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___________________?
A. 0 and 5 m/sec
B. 5 m/sec and 0
C. 5 V3 m/sec and 0
D. 5 and 5V3 m/sec
If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is___________________?
A. proportional to A
B. proportional to A2
C. proportional to 1/A2
D. independent of A
If the direction of projection bisects the angle between the vertical and the inclined plane, then the range of projectile on the inclined plane is__________________?
A. zero
B. maximum
C. minimum
D. unpredictable
If the given forces P,, P2, P3 and P4 are such that the force polygon does not close, then the system will___________________?
A. be in equilibrium
B. always reduce to a resultant force
C. always reduce to a couple
D. both (A) and (C)
If y is force and x is velocity, then dimensions of —=r are dx2__________________?
A. M’^T’
B. M’L-‘T0
C. M’L-‘T1
D. M2L’T3
Which of the following stresses is used for identifying the quality of structural steel ?
A. ultimate stress
B. yield stress
C. proof stress
D. none of the above