Question

25. If a jet engine provides a thrust of 45000 newtons, how long
must it fire to produce 1 million newton-seconds of impulse?
(a) 22s
(b) 18s
(c) 25s
(d) 15s

please help! it's a 9th grade question!!
​

Answer 1

Answer:

As we know that, impulse = Force * time

Given,

impulse = 1000000 Newton- sec

force = 45000 Newton

therefore, time = impulse ÷ force

• time = 1000000 ÷ 45000

= 22.22 sec

As the option have 22 sec, B is the correct answer

Plz mark as brainliest :)

Answer 2

$\bigstar$ Given

A jet engine provides a thrust of 45,000 Newtons

$\bigstar$ To Find

How long  must it fire to produce 1 million newton-seconds of impulse

$\bigstar$ Solution

We know that

$\red{\rm \longrightarrow t=\dfrac{I}{F}}$

Here

• t = time

• I = impulse

• F = force

According to the question

We are asked to find how long  must it fire to produce 1 million newton-seconds of impulse

Therefore

We must find "t"

Given that

A jet engine provides a thrust of 45,000 Newtons. How long  must it fire to produce 1 million newton-seconds of impulse

We know that

1 million =  10⁶

Hence

• F = 45,000 N

• I = 10⁶ N s

Substituting the values

We get

$\blue{\rm \longrightarrow t=\dfrac{10^{6}}{45000} \ s}$

$\green{\rm \longrightarrow t=\dfrac{1000000}{45000} \ s}$

On further simplification

We get

$\orange{\rm \longrightarrow t=22.22 \ s}$

On approximation

We get

$\pink{\rm \longrightarrow t \approx 22 \ s}$

Therefore

$\star$ Time = 22 s

Hence

$\checkmark$ Option (a) is correct