# What would happen if the Earth stopped rotating?

The speed of an object on earth's surface near equator is approximately is 1670 kilometers/hour. So, if the earth stops rotating suddenly,  the objects on the surface of earth which are unbound will be thrown eastwards tangentially with the speed of rotation of earth. Read more at: http://www.astronomycafe.net/qadir/q1168.html http://www.universetoday.com/66570/what-would-happen-if-the-earth-stopped-spinning/

# Class XI CBSE – Revision Questions MCQ – Semester 1

What is the gravitational field strength of a planet when the weight of a 100 kg astronaut is 400 N? a)      ¼ N kg-1   b) 9.8 N kg-1 c) 4 N kg-1  d) infinity   The only natural satellite of the earth complete orbits in about a)      24 days b) 27.3 days c) 30 days … Continue reading Class XI CBSE – Revision Questions MCQ – Semester 1

# What are the similarities and differences in magnetic and electric field?

Similarities and differences in magnetic and electric field (Dilpreet posted this question) Similarities Differences  Both electric and magnetic field are conservative forcesBoth obey inverse square law Both are non contact forces (Forces can be exert...

# Gravitation – Questionbank with answer for CBSE Class 9 SA1

The following questions are for a quick revision of the chapter “Gravitation” for CBSE Class 9. There are many other questions which can be asked from the portion allotted for SA1, but will mainly based on these concepts. The questions are based on the bare essential concepts; the minimum level of learning expected from the [...]

# Variation of acceleration due to gravity with depth. A doubt.

Rajkumar asks: “accelaration due to gravity decrease on depth of earth with the relation of g’=g(1-2h/R). but with relation of g=GM/(R*R)  g increase. Answer: When the object is on the surface or above it, the entire mass of the earth attracts it. But when it is inside, the net attraction towards CENTRE is provided only by the mass of [...]

# Coulombian force and conductor

what’s effect of  coulombic forces on conductor medium ? amk niazi Ans: In a conductor, the coulombian  repulsive forces  pushes the valence electrons and the electrons move away from the center to the surface ie from the region of stronger force to the region of lesser force, creating a Faraday cage   Incoming search terms:what’s effect of coulombic forces on conductor [...]

# Acceleration due to gravity

Does the acceleration due to gravity remains constant within the earth’s atmosphere or does it keep decreasing as we go up from the earth’s surface? Rashshad Rasheed Answer No acceleration due to gravity decreases as we go up from the earth’s surfacs Incoming search terms:acceleration due to gravity questionnumericals on gravitation of std ixsample questions [...]