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First Year Physics Circular Motion


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Class 9Class 10First YearSecond Year
54.Atwhatdepthbelowtheearthsurfacethevalueofgreducestoonehalfofitsvalueontheearthssurfacea)Re/2b)Re/4c)Red)2Re54. At what depth below the earth surface the value of g reduces to one half of its value on the earths surfacea) R_{e} / 2 b) R_{e} / 4 c) R_{e} d) 2 R_{e}

62. The weight of a man in an elevator moving down with an acceleration of 9.8 \mathrm{~m} / \mathrm{s}^{2} will becomea) Doubleb) Halfc) Zerod) Unchanged
62. The weight of a man in an elevator moving down with an acceleration of  9.8 \mathrm{~m} / \mathrm{s}^{2}  will becomea) Doubleb) Halfc) Zerod) Unchanged

62.Theweightofamaninanelevatormovingdownwithanaccelerationof9.8 m/s2willbecomea)Doubleb)Halfc)Zerod)Unchanged62. The weight of a man in an elevator moving down with an acceleration of 9.8 \mathrm{~m} / \mathrm{s}^{2} will becomea) Doubleb) Halfc) Zerod) Unchanged

A body of moment of inertia I=0.80 \mathrm{~kg} \mathrm{} \mathrm{m}^{2} about a fixed axis rotates with a constant angular velocity of 100 rad s^{-1} . Calculate its angular momentum L and the torque to sustain this motion.
A body of moment of inertia  I=0.80 \mathrm{~kg} \mathrm{} \mathrm{m}^{2}  about a fixed axis rotates with a constant angular velocity of 100 rad  s^{-1} . Calculate its angular momentum  L  and the torque to sustain this motion.

AbodyofmomentofinertiaI=0.80 kgm2aboutafixedaxisrotateswithaconstantangularvelocityof100rads1.CalculateitsangularmomentumLandthetorquetosustainthismotion.A body of moment of inertia I=0.80 \mathrm{~kg} \mathrm{} \mathrm{m}^{2} about a fixed axis rotates with a constant angular velocity of 100 rad s^{-1} . Calculate its angular momentum L and the torque to sustain this motion.

9. When a body moves in a circle the angle between its linear velocity and angular velocity is always.a) 180^{\circ} b) 0^{\circ} c) 90^{\circ} d) 45^{\circ}
9. When a body moves in a circle the angle between its linear velocity and angular velocity is always.a)  180^{\circ} b)  0^{\circ} c)  90^{\circ} d)  45^{\circ}

9.Whenabodymovesinacircletheanglebetweenitslinearvelocityandangularvelocityisalways.a)180b)0c)90d)459. When a body moves in a circle the angle between its linear velocity and angular velocity is always.a) 180^{\circ} b) 0^{\circ} c) 90^{\circ} d) 45^{\circ}

Explain how many minimum number of geo-stationary satellites are required for global coverage of T . V transmission?
Explain how many minimum number of geo-stationary satellites are required for global coverage of  T .  V  transmission?

ExplainhowmanyminimumnumberofgeostationarysatellitesarerequiredforglobalcoverageofT.Vtransmission?Explain how many minimum number of geo-stationary satellites are required for global coverage of T . V transmission?

45. The value of gravitational constant was determined bya) Newtonb) Keplerc) Cavendishd) Maxwell
45. The value of gravitational constant was determined bya) Newtonb) Keplerc) Cavendishd) Maxwell

45.Thevalueofgravitationalconstantwasdeterminedbya)Newtonb)Keplerc)Cavendishd)Maxwell45. The value of gravitational constant was determined bya) Newtonb) Keplerc) Cavendishd) Maxwell

A student holds two dumb-bells without stretched arms while sitting on a turn table. He is given a push until he is rotating at certain angular velocity. The student then pulls the dumbbell towards his chest (Fig. 5.25). What will be the effect on rate of rotation?
A student holds two dumb-bells without stretched arms while sitting on a turn table. He is given a push until he is rotating at certain angular velocity. The student then pulls the dumbbell towards his chest (Fig. 5.25). What will be the effect on rate of rotation?

Astudentholdstwodumbbellswithoutstretchedarmswhilesittingonaturntable.Heisgivenapushuntilheisrotatingatcertainangularvelocity.Thestudentthenpullsthedumbbelltowardshischest(Fig.5.25).Whatwillbetheeffectonrateofrotation?A student holds two dumb-bells without stretched arms while sitting on a turn table. He is given a push until he is rotating at certain angular velocity. The student then pulls the dumbbell towards his chest (Fig. 5.25). What will be the effect on rate of rotation?

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