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Blazing goIITian

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17 Mar 2010 19:43:28 IST

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The K.E needed to project a body of mass m from the earth's surface to infinity is...........a) mgR

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The K.E needed to project a body of mass m from the earth's surface to infinity is...........a) mgR b) 2mgR c)1/2 mgR

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THE GREAT

Hot goIITian

Joined: 16 Oct 2009

Posts: 158

17 Mar 2010 20:11:48 IST

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ITS (a)mgR

ESCAPE VELOCITY Vo=ROOT OVER2gR

SO K.E=1/2M(Vo)square

=m*g*R

IS IT RIGHT RATE IF IT IS

VASU

New kid on the Block

Joined: 21 Feb 2010

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17 Mar 2010 20:50:24 IST

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you have to see the conceptual physics book for this asnwer ok na

ThIrStY of IIT

Blazing goIITian

Joined: 6 Mar 2010

Posts: 380

17 Mar 2010 21:03:30 IST

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@ the great can you derive Vo=ROOT OVER2gR : i don't knoe this , I just knoe on = root over (G*m/R)

THE GREAT

Hot goIITian

Joined: 16 Oct 2009

Posts: 158

17 Mar 2010 21:37:26 IST

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GMm/R(square)=mg ( force of earth on a body of mass m i.e its weight )

therefore GM=gR(square)

FOR ESCAPE VELOCITY IT IS

1/2 m * V(square)=GMm/R = m*g *R(square) / R

THERFORE V(square)= 2gR

SO, V = ROOT OVER 2gR

SO IN UR QUESTION ANS IS (a)

ok did u get it or not

Sagar Saxena

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Joined: 8 Oct 2008

Posts: 6343

28 Nov 2010 12:49:31 IST

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its [a].it is simple to understand that

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