A stone is thrown vertically upwards with a vertical velocity of 49 m/sec. It returns to the ground in________________?
B. 8 sec
C. 10 sec✔
D. 20 sec
B. 8 sec
C. 10 sec✔
D. 20 sec
B. 8 sec
C. 10 sec✔
D. 20 sec
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A system of copianar forces is in equilibrium when___________________?
A system of copianar forces is in equilibrium when___________________? A. force polygon closes
B. funicular polygon closes
C. both force polygon” and funicular polygon close(Correct)
D. all the forces are concurrentA 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__________________?
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__________________? A. 1/4(Correct)
B. 1/3
C. 1/2
D. 1/5Assume g = 10 m/sec2
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_____________________?
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(Correct)
B. 75 and 50
C. 75 and 75
D. 50 and 50