help@askiitians.com

1800-150-456-789

AIPMT> a bullrt of mass 20 g leaves rifle at an ...

question mark

a bullrt of mass 20 g leavesrifle at an initial speed 100m/s and strikes a target at same level with speed 50 m/s the amount of work done by resistance of air is

harshita yadav , 7 Years ago

Grade 12th pass

1 Answers

Arun

Last Activity: 7 Years ago

Dear Harshita

by work - energy theorem,
initial KE - final KE = work performed against air resistance
Initial KE = 1/2 * m * vi^2
Final KE = 1/2 * m * vf^2
Hence change = 1/2 * 20/1000 * (100^2 - 50^2) = 1/100 * 150 * 50 = 75 J
So work done by bulllet against air resistance = 75 J
Or work performed by air to reduce the energy of bullet = 75 J

Regards,

Arun (AskIITians Forum Expert)

Provide a better Answer & Earn Cool Goodies

Enter text here...

LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

Full Live Access

Study Material

Live Doubts Solving

Daily Class Assignments

Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

question mark

NEET COACHING FOR GRADE 9 STUDENT IN ABU DHABI,UAE. What are the options available

AIPMT

0 Answer Available

Last Activity: 2 Year ago(s)

question mark

Explaination on the strength of bonds in the figure

AIPMT

0 Answer Available

Last Activity: 3 Year ago(s)

question mark

Mam today in neet ug 2021 due to my nervousness I bubbled one wrong figure of my roll number but I have filled the roll number correctly in the blocks the invigilator adviced me to leave it as it is and to bubble the same correct figure so I did that .am very much worried what will happen

AIPMT

0 Answer Available

Last Activity: 3 Year ago(s)

question mark

Magnetic Length of bar magnet of length 70 cm is 63 cm. Want a solution for this.

AIPMT

0 Answer Available

Last Activity: 3 Year ago(s)

question mark

in the stomatal apparatus why are subsidiary celss absent in cucurbits?

AIPMT

1 Answer Available

Last Activity: 3 Year ago(s)

View all Questions