Question

One horsepower is a unit of power equal to 746 W. How much energy can a 150-horsepower engine transform in 10.0 s?

Answer 1

Answer:

$E = 1119000\ joules$

Explanation:

Given:

$1\ Hp = 746\ watt$

time (t = 10.0 sec)

power = 150 Hp

We need to find the energy transformed by a 150 Hp engine in 10 s.

Solution:

First we convert 150 Hp in watt.

$1\ Hp = 746\ watt$

$150\ Hp = 150\times 746\ watt$

$150\ Hp = 111900\ watt$

So, power (p = 111900 watt)

We know that, if we multiply power by time, we get energy transform by engine.

$P = \frac{E}{t}$

$E = P\times t\ joule$  -----------(1)

Where:

P ⇒ power.

E ⇒ Energy.

t ⇒ time.

Substitute p = 111900 watt and t = 10 s in equation 1.

$E = 111900\times 10$

$E = 1119000\ joules$

Therefore, a 150 Hp engine could transform 1,119,000 joules energy  in 10 s.