Question 766:

• JAMB 1994

Calculate the magnitude of the force required to just move a 20kg object along a horizontal surface if the coefficient of friction is 0.2. [g = 10ms^-2]

A. 400.0N
B. 40.0N
C. 4.0N
D. 0.4N

Question 767:

• JAMB 1994

Calculate the velocity ratio of a screw jack of pitch 0.3cm if the length of the tommy bar is 21cm

A. \(\frac{1}{140}\)\(\pi\)
B. 14\(\pi\)
C. 70\(\pi\)
D. 140\(\pi\)

Question 768:

• JAMB 1994

A force of 15N stretches a spring to a total length of 30cm. An additional force of 10N stretches the spring 5cm further. Find the natural length of the spring

A. 25.0cm
B. 22.5cm
C. 20.0cm
D. 15.0cm

Question 769:

• JAMB 1994

Which of these statements are TRUE of pressure in liquids? i. pressure acts equally in all direction. ii. pressure decreases with depth. iii. pressure at the same level of a liquid is the same. iv pressure is dependent on the cross-sectional area of the barometer tube

A. I, iii only
B. I, ii, iii only
C. I, iii, and iv only
D. I, ii, iii and iv

Question 770:

• JAMB 1994

The mass of a specific gravity bottle is 15.2g when it is empty. it is 24.8g when filled with kerosene and 27.2g when filled with distilled water. Calculate the relative density of kerosene

A. 1.25
B. 1.10
C. 0.90
D. 0.80