Question

A boy has to do 450 J of work in 30 seconds to lift luggage to the roof of a bus. How much power does he spend? *​

Answer 1

Aɴsᴡᴇʀ:

• The power spent by the boy = 15 watts

Gɪᴠᴇɴ:

• A boy has to do 450 J of work in 30 seconds to lift luggage to the roof of a bus.

Nᴇᴇᴅ ᴛᴏ ғɪɴᴅ:

• The power spent by the boy = ?

Solution:

Fᴏʀᴍᴜʟᴀ ᴜsᴇᴅ ʜᴇʀᴇ:

• Power = Work done/Time

Pᴜᴛᴛɪɴɢ ᴛʜᴇ ᴠᴀʟᴜᴇs:

➥ Required Power = 450/30

➥ Required Power = 15

Tʜᴇʀᴇғᴏʀᴇ:

• The power spent by the boy is 15 watts.

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Answer 2

GivEn:

• Work (w) = 450 J
• Time (t) = 30 seconds

To Find:

• How much Power does he spend ?

Formula Used:

$\bullet{\boxed{\sf\green{ Power = \dfrac{Work}{Time} }}}$

Solution:

➺ p = w/t

➺ p = 450/30

➺ p = 15 w

Hence,

The Power spent in Work is 15.

Remarks:

• p = Power
• w = Work
• t = time
• w = watt