Applied Mechanics And Graphic Statics - Study Mode

Show All Answers

[#66] The gravitational force makes a satellite go round the earth in a circular orbit, if it is projected with an initial velocity of

(A) 8.04 km/sec at a height of 285 km

(B) 11.11 km/sec at a height of 37,400 km

(C) 11.26 km/sec, the satellite escapes the pull of the earth

(D) All the above

Correct Answer

(D) All the above

[#67] Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis?

(A) Disc with larger density

(B) Disc with smaller density

(C) Both discs will have same rotational inertia

(D) None of the above

Correct Answer

(B) Disc with smaller density

[#68] A rod 5 m in length is moving in a vertical plane. When it is inclined at 60° to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is

(A) 0.5 m/sec

(B) 1.0 m/sec

(C) 1.5 m/sec

(D) 2.5 m/sec

Correct Answer

(B) 1.0 m/sec

[#69] Pick up the correct statement from the following:

(A) If two equal and perfectly elastic smooth spheres impinge directly, they interchange their velocities

(B) If a sphere impinges directly on an equal sphere which is at rest, then a fraction $$frac{1}{2}left( {1 - {{ ext{e}}^2}} ight)$$ xa0 the original kinetic energy is lost by the impact

(C) If a smooth sphere impinges on another sphere, which is at rest, the latter will move along the line of centres

(D) If two equal spheres which are perfectly elastic impinge at right angles, their direction after impact will still be at right angles

(E) Nature plays an important role in the launch of a satellite

(F) The earth's gravity reduces the speed of a satellite by 32 km per second

(G) The gravitational force relents as the satellite climbs higher

(H) All the above

Correct Answer

(H) All the above

[#70] Pick up the incorrect statement from the following:

(A) The C.G. of a circle is at its centre

(B) The C.G. of a triangle is at the intersection of its medians

(C) The C.G. of a rectangle is at the intersection of its diagonals

(D) The C.G. of a semicircle is at a distance of r/2 from the centre

Correct Answer

(D) The C.G. of a semicircle is at a distance of r/2 from the centre