113. A weight of 500 kg is held on a smooth plane, inclined at 30° to the horizontal by a force P acting 30° above the plane. the force P should be

A.500 kg

B.250 kg

C.476 kg

D.288 kg

114. A weight of 500 kg is held on a smooth plane, inclined at 30° to the horizontal by a force P acting 30° above the plane. if the angle of friction be 30?, then force P would be

A.500 kg

B.250 kg

C.476 kg

D.288 kg

115. A bar AB resting against - smooth surfaces at A and B. The reaction at B will be in the direction

A.Horizontal

B.Vertical

C.Along bar BA

D.Inclined in a line joining point B and the point where forces R and W meet

116. A freight car weighing 50,000 kg is moving with a velocity of one m/sec when it strikes a bumping post. If the draw bar spring on the car takes all of the compression, and the deflection is not to be more than 10 cm, then scale of spring should be approximately equal to

A.50 x 10^4 kg/cm

B.100 x 10^4 kg/cm

C.25x 10^4 kg/cm

D.250 x 10^4 kg/cm

117. If a mass of 20 kg falling from a height of 1.0 m from rest is brought to rest by penetrating into sand by 1 m then average resistance offered by sand is?

A.100 kg

B.110 kg

C.150 kg

D.200 kg

118. A body weighing 1000 kg falls 8 cm and strikes a 500 kg/cm spring. The deformation of spring will be

A.8 cm

B.4 cm

C.16 cm

D.2 cm

119. An elevator weighing 1000 kg attains an upward velocity of 4 m/sec in two sec with uniform acceleration. The tension in the supporting cables will be

A.1000 kg

B.800 kg

C.1200 kg

D.2000 kg

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