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Physics

Chima Sunday (Tutor)
31-05-2016 16:33:00 +0000

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• Jennifer Sparkle

what score those an intending medical student is expected to get in jamb?

2 31-05-2016 16:40:00 +0000

wat is d cut off mark for medice nd nursing in unimaid

2 31-05-2016 19:41:00 +0000

• Obini Emeke

200 or 180 depending on the choice of institution

2 31-05-2016 19:45:00 +0000

• Saved Emmanuel

pls when will Uniuyo's post utme commence????

2 01-06-2016 07:47:00 +0000

• Majiri E

pls help out... I need the workings to this question? An object weights 100N on the earth's surface .find its weight at a point P with orbital radius 2R (g=10Nkg-1) A 40N B 35N C 25N D 20N

2 01-06-2016 09:58:00 +0000

• Chima Sunday (Tutor)

Simple Solution
W = mg
So our work is to use the information given to find the mass and acceleration due to gravity at that point and then multiply them.
F = W = GMm/R2 (Newton gravitational force)
On the earth surface with radius R, W = 100N
Then 100 = GMm/R2
by subject formular m = 100R2/GM ...........(1)
Equation (1) is the mass of the object
For g at that orbital radius of 2R
F = W = mg = GMm/4R2
by subject formular, g = GM/4R2 ..........(2)
note that m cancelled each other
Now that we have our m and g, we can go ahead and multiply to obtain
W = m * g = 100R2/GM * GM/4R2 = 100/4 = 25N

2 01-06-2016 12:36:00 +0000

• Emmanuella Amarachi

A glass of initial volume 2×10^4cm^3 is heated from 20^0C to 50^0C.If the linear expansity of glass is 9×10^-6k^-1,the volume of the bottle at 50^0C is (a)20016.2Cm^3 (b)20005.4cm^3 (c)20008.1cm^3(d)20013.5cm^3

2 09-06-2016 22:26:00 +0000

• Emmanuella Amarachi

A glass of initial volume 2×10^4cm^3 is heated from 20^0C to 50^0C.If the linear expansity of glass is 9×10^-6k^-1,the volume of the bottle at 50^0C is (a)20016.2Cm^3 (b)20005.4cm^3 (c)20008.1cm^3(d)20013.5cm^3

2 09-06-2016 22:28:00 +0000

• Emmanuella Amarachi

A glass of initial volume 2×10^4cm^3 is heated from 20^0C to 50^0C.If the linear expansity of glass is 9×10^-6k^-1,the volume of the bottle at 50^0C is (a)20016.2Cm^3 (b)20005.4cm^3 (c)20008.1cm^3(d)20013.5cm^3

2 09-06-2016 22:29:00 +0000

• Emmanuella Amarachi