Post Utme Physics Past Questions and Answers

Question 41:

A force of $20\mathrm{N}$ applied parallel to the surface of horizontal table is just sufficient to make a block of mass $4\mathrm{kg}$ set for motion. Find the acceleration when the force is doubled.

A. $2{\mathrm{ms}}^{-2}$
B. $4{\mathrm{ms}}^{-2}$
C. $5{\mathrm{ms}}^{-2}$
D. $10{\mathrm{ms}}^{-2}$

Question 42:

A man walks $1\mathrm{km}$ due east and then $1\mathrm{km}$ due north. His displacement is ____________

A. $1\mathrm{km}N{15}^{\circ }\mathrm{E}$
B. 1 $\mathrm{km}\mathrm{N}{30}^{\circ }\mathrm{E}$
C. $\sqrt{2}\mathrm{km}\mathrm{N}{45}^{\circ }\mathrm{E}$
D. $2\mathrm{km}\mathrm{N}{75}^{\circ }\mathrm{E}$

Question 43:

A motor car moves with a velocity of $20{\mathrm{ms}}^{-1}$ on a rough horizontal road and covers a displacement of $50\mathrm{m}$. Find the coefficient of dynamic friction between the type and the ground $\text{Extra left or missing right}$

A. $0.3$
B. $0.4$
C. $0.6$
D. $0.5$

Question 44:

A physics student standing on the edge of a cliff throws a stone vertically downward with an initial speed of $10.0\mathrm{m}/\mathrm{s}$. The instant before the stone hits the ground below, it is traveling at a speed of $30.0\mathrm{m}/\mathrm{s}$. If the physics student were to throw the rock horizontally outward from the cliff instead, with the same initial speed of $10.0\mathrm{m}/\mathrm{s}$, what is the magnitude of the velocity of the stone just before it hits the ground?

A. $10.0\mathrm{m}/\mathrm{s}$
B. $20.0\mathrm{m}/\mathrm{s}$
C. $30.0\mathrm{m}/\mathrm{s}$
D. $40.0\mathrm{m}/\mathrm{s}$

Question 45:

A quantity is defined as the product of cross-sectional area and change in momentum per unit $C$ length. Which of the following is its SI unit?

A. $\mathrm{Nm}$
B. ${\mathrm{kgs}}^{-1}$
C. ${\mathrm{kgm}}^2{\mathrm{s}}^{-1}$
D. ${\mathrm{Nkgs}}^{-1}$