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.Management Sciences
Category: Applied Mechanics and Graphic Statics
A projectile has maximum range of 40 m on a horizontal plane. If angle of projection is a and the time of flight is 1 second, then sin a must be about__________________?
0
A. 1/4
B. 1/3
C. 1/2
D. 1/5
Assume g = 10 m/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
The maximum value of the horizontal range for a projectile projected with a velocity of 98 m/sec is__________________?
A. 98 m
B. 490 m
C. 980 m
D. 1960 m
One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is___________________?
A. a simple harmonic motion
B. a rectilinear motion with constant speed
C. a damped oscillatory motion
D. none of the above
The maximum displacement of a particle executing S.H.M. corresponds to__________________?
A. zero potential energy and maximum kinetic energy
B. zero kinetic energy and maximum potential energy
C. maximum kinetic energy and maxi-mum potential energy
D. minimum kinetic energy and minimum potential energy
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