Question

If it takes you 30 seconds to move a chair 20 meters across the floor, using a force of 5 Newtons, how much power did you put out?

Answer 1

Answer:

10/3 watt

Explanation:

P=w/t

and

w=F.s

given that, t=30sec s=20m F=5 newton

now,

w=F.s

=5*20

=100 J

we know that,

P=w/t

=100/30

=10/3watt

Answer 2

$\bigstar$ Given

→ Force = 5 N

→ Distance = 20 m

→ Time = 30 s

$\bigstar$ To Find

→ Power

$\bigstar$ Solution

We know that

$\star$ Power

$\red{\rm \longrightarrow P=\dfrac{W}{t}}$

$\star$ Work done

$\orange{\rm \longrightarrow W=Fd}$

Combining both

We get

$\pink{\rm \longrightarrow P=\dfrac{Fd}{t}}$

Here

• P = Power
• F = Force
• d = Distance
• t = Time

Units

• P = Wattage (W)
• F = Newton (N)
• d = metre (m)
• t = second (s)

According to the question

We are asked to find the power

Therefore

We must find " P "

Given that

→ Force = 5 N

→ Distance = 20 m

→ Time = 30 s

Hence

• F = 5 N
• d = 20 m
• t = 30 s

Substituting the values

We get

$\rm \longrightarrow P=\dfrac{5 \times 20}{30} \ W$

$\rm \longrightarrow P=\dfrac{100}{30} \ W$

$\rm \longrightarrow P=\dfrac{10}{3} \ W$

Therefore

$\purple{\rm \longrightarrow P=3.33 \ W}$

Hence

$\checkmark$ Power = 3.33 W