A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec2. Time required to traverse a distance of 1.5 m, is
Options
A. 40 sec
B. 30 sec
C. 20 sec
D. 15 sec
E. 10 sec.
Correct Answer
20 sec
Applied Mechanics problems
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1. According to Law of Triangle of Forces
Options
A. three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force
B. three forces acting along the sides of a triangle are always in equilibrium
C. if three forces acting on a, point can be represented.in magnitude and direction, by the sides of a triangle taken in order, these will be in equilibrium
D. if three forces acting at a point are in equilibrium each force is proportional to the sine of the angle between the other two
E. if the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order.
Correct Answer: if the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order.
2. A pilot flies a small plane in a vertical loop of radius r. At the top of its trajectory he experiences weightlessness. If the acceleration due to gravity is g, the speed of the plane at the top of its trajectory would be
8. Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after impact would be
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