An unruly demonstrator lifts a stone of mass 200 g from the ground and throws it at his opponen

step 1 As per the question, an unruly demonstrator lift a stone of mass. So mass of the stone is given

An unruly demonstrator lifts a stone of mass 200 g from the...

An unruly demonstrator lifts a stone of mass $200 \mathrm{~g}$ from the ground and throws it at his opponent. At the time of projection, the stone is $150 \mathrm{~cm}$ above the ground and has a speed of $3 \cdot 00 \mathrm{~m} / \mathrm{s}$. Calculate the work done by the demonstrator during the process. If it takes one second for the demonstrator to lift the stone and throw, what horsepower does he use?

Key Concepts

Work

Work is the energy transferred to or from an object when a force is applied over a distance. It is calculated by multiplying the force by the distance moved in the direction of the force, and it represents the total energy input into or output from a system in the process.

Gravitational Potential Energy

Gravitational potential energy (GPE) is the energy an object possesses due to its position in a gravitational field. When an object is lifted to a certain height, its GPE increases, and this energy is given by the product of the object’s mass, the gravitational acceleration, and the height raised.

Kinetic Energy

Kinetic energy is the energy an object possesses due to its motion. It is calculated using the formula one half times the mass of the object multiplied by the square of its velocity. In problems that involve moving objects, the kinetic energy reflects the energy associated with the object's speed.

Power

Power is the rate at which work is done or energy is transferred over time. It quantifies how quickly energy is used or transformed and is calculated as work divided by the time over which the work is done.

Unit Conversion

Unit conversion is the process of converting a measure from one system of units to another. In energy and power calculations, it is often necessary to convert between units like Joules and horsepower, ensuring that the final results are expressed in the desired or conventional units.

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