Question

Rajani exerts a force of 1450 N in pulling a cart at a constant speed of 36 km h-1 calculate the power exerted​

Answer 1

Given :

• Force exerted by Rajan, F = 1450 N
• constant velocity at which cart is pulled, v = 36 km h⁻¹ = 36 × ( 5 / 18 ) ms⁻¹ = 10 ms⁻¹

To find :

• Power exerted, P = ?

Formula required :

• Power can be expressed as the product of force exerted and constant velocity

     P = F . v

[ where P is power exerted, F is force exerted and v is velocity ]

Calculation :

Using formula

→ P = F . v

→ P = ( 1450 ) ( 10 )

→ P = 14500 W

therefore,

• Power exerted is equal to 14500 Watt.

Some related info :

• Power is a scalar quantity.
• Dimensions of Power [ ML²T⁻³ ]
• SI unit of Power : Watt
• 1 Watt = 1 J s⁻¹

Answer 2

Explanation:

Using formula

⟹ P = F.v

⟹P = ( 1450 ) ( 10 )

⟹P = 14500 W

therefore,

Power exerted is equal to 14500 Watt.