Work Energy And Power

Q: Consider an elliptically shaped rail PQ in the vertical plane with OP \$=\$ 3m and OQ \$=\$ 4m. A block of mass 1 kg is pulled along the rail from P to Q with a force of 18 N, which is always parallel to line PQ (see the figure given). Assuming no frictional losses, the kinetic energy of the block when it reaches Q is (n \$\times\$ 10) Joules. The value of n is (take acceleration due to gravity \$=\$ 10 ms\$^{-2}\$)

Using work energy principle,\$ \sum WD = \sum KE \$\$ \therefore -mgh + F.x = KE\$\$ \therefore -(1)(10)(4) + 18\times \sqrt{ 4^{2} + 3^{2} } = KE \$\$ \therefore KE = 50 \$\$ \therefore n = 5 \$

Question

Consider an elliptically shaped rail PQ in the vertical plane with OP $=$ 3m and OQ $=$ 4m. A block of mass 1 kg is pulled along the rail from P to Q with a force of 18 N, which is always parallel to line PQ (see the figure given). Assuming no frictional losses, the kinetic energy of the block when it reaches Q is (n $\times$ 10) Joules. The value of n is (take acceleration due to gravity $=$ 10 ms $^{- 2}$ )

Work Energy And Power

Physics 5979 Views

Physics
5979 Views