Question

The power of lifting a stone of mass 10kg and specific gravity 3 from the bed of a lake to height of 6m in water in 9.8s is __ ×10w.

need solution for this!​

Answer 1

Explanation:

Formula for potential energy:

The formula for potential energy depends on the force acting on the two objects. m×g×h.

The Potential Energy comes under Work Done.

Mass = 10kg

Gravity = 3nm^2÷kg^2 from bed

Height = 6m

Therefore the Work Done = m×g×h

= 10×3×6

= 180

Therefore the answer is 180 joules.

Answer 2

Topic :-

Work, Power and Energy

Given :-

A stone of mass 10kg and specific gravity 3 is raised from the bed of a lake to height of 6m in water in 9.8s.

To Find :-

Power exerted in performing given statements.

Formulae Used :-

$Loss\:of\:mass\:in\:water=\dfrac{Mass}{Specific \:Gravity}$

$Power=\dfrac{Work\:done}{t}=\dfrac{Force \times Height\:Displaced}{t}$

Solution :-

Calculating loss of mass in water,

Specific Gravity = 3

Mass = 10 kg

$Loss\:of\:weight\:in\:water=\dfrac{10}{3}$

Mass of stone in water = Original Mass - Lost Mass

Mass of stone in water = $10-\dfrac{10}{3}$

Mass of stone in water = $\dfrac{20}{3}kg$

Force = Mg

$Force=\dfrac{20}{3} \times 9.8 \: N$

Work Done = Force × Height Displaced

Height displaced = 6 metres

$Work\:Done=\dfrac{20}{3} \times 9.8 \times 6\: J$

Time = 9.8 seconds

$Power=\dfrac{\dfrac{20}{3} \times 9.8 \times 6}{9.8}\: W$

Power = 20 × 2 W

Power = 4 × 10 W

Answer :-

So, value of blank is 4.