Question

68. A body of mass 4 kg is moving up an inclined plane
rising 1 in 40 with velocity 40 m/sec if efficiency
is 50% the calculate power required.
(1) 38.4 W
(2) 55 W
(4) 108 W
(3) 78.4 W​

Answer 1

Answer:

Force applied

=

$mg \sin( \alpha )$

= 4×10÷40 N(Given Sine of angle is 1/40)

= 1 N

Power

= 1×40 = 40 W

Thus,

Required power

= 40 ÷ 50% W

= 40÷(1/2) W

= 80 W (3)

Since I have taken g = 10 m/s^2 hence the answer is a little bit different.I hope you understand.