Civil Engineering - Applied Mechanics

Exercise :: Applied Mechanics - Section 2
1.
The following factor affects the orbit of a satellite up to an altitude of 720 km from the earth's surface

A.
uneven distribution of the gravitational field B.
gravity of the sun and the moon C.
aerodynamic forces D.
none of these.

Answer: Option D

Explanation:

2.
If α and u are the angle of projection and initial velocity of a projectile respectively, the horizontal range of the projectile, is

Answer: Option A

Explanation:

3.
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

A.
is directly proportional to their velocity of approach B.
is inversely proportional to their velocity of approach C.
bears a constant ratio to their velocity of approach D.
is equal to the sum of their velocities of approach.

Answer: Option C

Explanation:

4.
Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of

A.
5 Newtons B.
8 Newtons C.
10 Newtons D.
12 Newtons.

Answer: Option C

Explanation:

5.
A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60°. The velocity attained by the projectile when it is moving at a height of 100 m, is

A.
70 m/sec. B.
75 m/sec. C.
80 m/sec. D.
85 m/sec. E.
90 m/sec.

Answer: Option E

Explanation: