How high can a man weighing m kg climb using the energy from... | PHYSICS - THE CONSERVATION OF MECHANICAL ENERGY | SolveeIt | Solveeit

Today, August 19

Question

How high can a man weighing m kg climb using the energy from a chocolate producing 100 calories in him? Let his efficiency be η

A

$\frac { 420 \eta } { \mathrm { mg } }$ metre

B

$\frac { 4.20 \eta } { \mathrm { mg } }$ metre

C

$\frac { \eta } { \mathrm { mg } }$ metre

D

42 η mg metre

Answer

$\frac { 420 \eta } { \mathrm { mg } }$ metre

Explanation

Solution

Efficiency = $\frac { \text { output } } { \text { input } }$

i.e., Output = efficiency × input

= η × 100 calorie

= η × 100 × 4.2

= 420 η joule

or mgh = 420 η

or h =