Physics
Work and Energy
Page 19 of 23
#145 A constant force $F=5\,\text{N}$ acts through $s=4\,\text{m}$ at $\theta=60^\circ$. The work done is:
A) $F/s$
B) $Fs$
C) $F+s$
D) $5s\,\cos60^\circ$
#146 At the bottom of a frictionless track, potential energy is minimum and kinetic energy is:
A) maximum
B) zero
C) undefined
D) minimum
#147 The work–energy theorem for a particle of mass $m$ is:
A) $W_{\text{net}}=\Delta K$
B) $W_{\text{net}}=m\Delta v$
C) $W_{\text{net}}=\Delta p$
D) $W_{\text{net}}=\Delta U$
#148 Dimensions of power are:
A) $M^{0}L^{0}T^{-1}$
B) $ML^{2}T^{-2}$
C) $ML^{2}T^{-3}$
D) $MLT^{-2}$
#149 A constant force $F=10\,\text{N}$ acts through $s=4\,\text{m}$ at $\theta=0^\circ$. The work done is:
A) $Fs$
B) $F+s$
C) $40$
D) $F/s$
#150 At the bottom of a frictionless track, potential energy is minimum and kinetic energy is:
A) minimum
B) undefined
C) maximum
D) zero
#151 If both mass and velocity are doubled then K.E would be
A) Quadrupled
B) Doubled
C) Eight times
D) Sixteen times
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