Astronomyl 207l ASTRl 207l Midterml 2l

Astronomyl 207/l ASTRl 207l Midterml 2l Examl -l (Latestl 2026/l 2027l Update)l Review|l 100%l Verifiedl Questionsl &l Answersl |l Gradel A

Q:l accelerationl ofl gravityl is?

Answer:

alll fallingl objectsl acceleratel atl samel speedl (notl countingl thel frictionl ofl airl resistance)l onl earthl g=10m/s^2l speedl increasesl 10l m/sl withl eachl secondl ofl falling.

Q:l Momentuml andl force?

Answer:

force=l massl xl acceleration momentum=l massl xl velocity netl forcel changesl momentuml whichl generallyl meansl anl accelerationl (changel inl velocity)l rotationall momentuml ofl al spinningl orl orbitingl objectl isl knownl asl angularl momentum.l TORQUEl changesl anl objectsl angularl momentum

Q:l Howl isl massl differentl froml weight?

Answer:

mass=l amountl ofl matterl inl anl object -weight=l forcel thatl actsl uponl anl object

Q:l whyl arel astronautsl weightlessl inl space?

Answer: 1 / 3

itl isl NOTl becausel therel isl nol gravity,l therel ISl gravityl inl space,l theirl weightlessnessl isl duel tol al constantl statel ofl freel fall.

Q:l 1D,l 2D,l andl 3D?

Answer:

1D=l positionl oftenl calledl 'x'l distancel alongl al linel usingl al ruler 2D=l positionl inl al plane,l distancel +l directionl 'vectorl distance'l canl bel representedl byl anl arrow 3D=l distancel +l directionl butl directionl isl inl 3Dl space.

Q:l Accelerationl is?

Answer:

changel inl velocityl /l changel inl timel

ex:l onl anl electricl bikel inl al straightl line

0l tol 30l km/hl inl 2l seconds magnitudel =l 8.4l m/sl /l 2l =l 4.2M/l sl ^2l directionl N

Q:l 0l vectorl has..?

Answer:

nol direction,l itl isl thel onlyl acception,l

also,l weightl alwaysl measuredl newtonsl wkgl =l 20l newtons

Q:l Howl didl newtonl changel ourl viewl ofl thel universe?

Answer:

thel samel physicall lawsl thatl operatel onl earthl operatel inl thel heavens.l hel discoveredl thel lawsl ofl motionl andl gravity,l calculus,l experimentsl withl light,l andl reflectingl telescopes.

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Q:l Whatl arel newtonsl 3l lawsl ofl motion?

Answer:

Firstl law=l objectsl movel atl al constantl velocityl unlessl al netl forcel actsl tol changel itsl speedl orl direction.Secondl law=l 2l ways,l Force=massl xl accelerationl F=Ma force=l ratel ofl changel inl momentuml Thirdl law=l forl everyl force,l therel isl alwaysl equall andl oppositel reactionl force.

Q:l Conservationl lawsl inl astronomyl are?

Answer:

whyl dol objectsl movel atl al constantl velocityl ifl nol forcel actsl onl them?l objectsl continuel atl al constantl velocityl becausel ofl thel conservationl ofl momentum.l itl isl anl absolutel lawl thatl alwaysl holdsl true.Totall momentuml ofl interactingl objectsl cannotl changel unlessl anl externall forcel isl actingl onl them.Interactingl objectsl exchangel momentuml throughl equall andl oppositel forces.

Q:l Conservationl ofl angularl momentuml is?

Answer:

ml xl vl xl rl 'angularl momentum'=l massl xl velocityl xl radiusl (distancel froml centre)l thel angularl momentuml ofl anl objectl cannotl changel unlessl anl externall twistingl forcel (torque)l isl actingl onl it.l Earthl experiencesl nol twistingl forcel asl itl orbitsl thel sun,l sol itsl rotationl andl orbitl willl continuel indefinitely.

Q:l wherel dol objectsl getl theirl energy?

Answer:

thel basicl typesl ofl energyl are:l -kineticl (motion)l -Radiativel (light)l -l potentiall (stored)l whichl canl bel convertedl tol kineticl orl radiative.energyl isl definedl inl termsl ofl 'work'l forcel overl distance

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