Question 891:

• JAMB 1997

Find the standard deviation of the following data -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5

A. 2
B. 3
C. √10
D. √11

Question 892:

• JAMB 1997

For what value of 6 are the forces in the diagram above in equilib4ruim

A. \( 15^{\circ} \)
B. \( 30^{\circ} \)
C. \( 45^{\circ} \)
D. \( 60^{\circ} \)

Question 893:

• JAMB 1997

The fig above shows a block of mass m sliding down a rough inclined plane QP at angle \( \theta \) . The forces acting on the block along QP are

A. Mg sinθ and the normal reaction
B. Mg sinθ and the force of friction
C. Mg sinθ and the normal reaction
D. Mg cosθ and the normal reaction

Question 894:

• JAMB 1997

A uniform light beam XZ is Hinged at X and kept in equilibrium by the forces T and F as shown in the diagram above. if XO = 20m and OY = 30cm, express T in terms of F

A. T =2√3/3
B. T= 2F
C. T = 5V3F/3
D. T = 5F

Question 895:

• JAMB 1997

For a rough inclined plane on which lies a body of weight W, the angle θ in the diagram above becomes the angle of friction if

A. Tan θ = coefficient of static friction
B. Cos θ = coefficient of dynamic friction
C. Sin θ = coefficient of sliding friction
D. Sec θ = limiting frictional force