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.
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- 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 d) 365 1/4 days
- The satellite that revolves in a polar orbit is called
a) Natural Satellite b) Geostationary satellite c) Polar Satellite d) None of these
4) The height of a communication satellite above the earth’s surface is about
a) 1km b) 100 Km c) 10,000 Km D) 36000 Km
5) At what depth below the earth’s surface does the weight of a body becomes 1% of its value at the surface of the earth?
a) 32Km b) 64 Km c) 128 Km d) 164 Km
6) The arte of change of angular momentum is called
a) a Force b) Torque c) Impulse d) None of these
7) Which of the following has the largest moment of inertia (Each object has same mass)
a) Solid sphere
b) Bar Magnet
c) Ring about an axis perpendicular to its plane
d) Disc about an axis perpendicular to its plane
8) A hollow cylinder and a solid cylinder having same mass and same diameter are related simultaneously from rest from the top of the inclined plane. Which of them will reach the bottom first?
a) Solid cylinder
b) Hollow Cylinder
c) Both will reach the bottom together
d) One having greater density
9) A body moving with a constant speed on a horizontal surface does not have
c) Kinetic Energy
10) Which of the following has its unit as Newton-Second
a) Torque b) Momentum c) Energy d) Planck is constant
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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...
Categories: Ask Physics, conservative forces, inverse square law, Project, Similarities, similarities differences Tags: Auto, Draft, Electric, electric flux, field, flux, forcesBoth, inverse, inverse square law, law, magnetic field, magnetic field lines, magnetic flux, Physics, Similarities, similarities and differences, similarities differences, surface
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 [...]
Categories: Ask Physics, falling to earth, gravitation states, law of gravitation, Project, questionbank, universal law of gravitation Tags: acceleration, acceleration due to gravity, answer, Auto, Draft, gravitation, gravitation states, law, law of gravitation, mass, Physics, questionbank, revision, surface, universal law of gravitation
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 [...]
Categories: Ask Physics, mass of the earth, Project, rajkumar Tags: acceleration, acceleration due to gravity, centre, doubt, mass of earth, mass of the earth, Physics, rajkumar, search terms, sphere, surface
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 [...]
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 [...]