Physics-
General
Easy
Question
A frictionless track 
ends in a circular loop of radius 
figure. A body slides down the track from point 
which is at a height 
cm. Maximum value of 
for the body to successfully complete the loop is
- 5 cm
- 15/4 cm
- 10/3 cm
- 2 cm
The correct answer is: 2 cm
For successfully completing the loop,
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As
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As
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A body is projected up a smooth inclined plane with a velocity 
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or
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Let us consider an element (spherical shell) of thickness d
and radius as shown in figure. Let us first find the equivalent thermal resistance between inner and outer sphere.
Resistance of shell=
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Rate of heat flow = H
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and radius as shown in figure. Let us first find the equivalent thermal resistance between inner and outer sphere.Resistance of shell=
=
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Let us consider an element (spherical shell) of thickness d and radius as shown in figure. Let us first find the equivalent thermal resistance between inner and outer sphere.
Resistance of shell=
=
Rate of heat flow = H
=
=
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=
Rate of heat flow = H
=
=
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An electric lamp is fixed at the ceiling of a circular tunnel as shown is figure. What is the ratio the intensities of light at base A and a point B on the wall
and 
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The distance between a point source of light and a screen which is 60 cm is increased to 180 cm. The intensity on the screen as compared with the original intensity will be
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physics-General
