Wat is the acceleration of gravity of Earth 1 98 ms2 dwnwrd

Wat is the acceleration of gravity of Earth?

1- 9.8 m/s² dwnwrd 2- 9.8 m/s dwnwrd 3- 9.8 km/s² dwnwrd 4- 9.8 m²/s dwnwrd

Why wr nnt ppls unbl t dtt stllr prllx?

1- Thy dd nt lk fr t. 2- Thy dd dtt t, but thy rjtd th bsrvtns

3- Thy uld nt s dstnt strs 4- Thy dd nt bsrv fr lng nugh prds f tm.

5- Thy dd nt hv th blty t msur vry smll ngls.

rth is md mstl of mtls and rcks. Whr dd ths mtral cm frm?

1- is was produced in the Big Bang 2- it was created by chemical reactions in interstellar space

3- it was produced by nuclear fusion in stars 4- is was made by our Sun

5- it was made by nuclear fussion of uranium and other radioactive metals

Hw dd Ertsthns stmt th sz f Erth n 240 B.C.?

1- b bsrvng th durtn f slr ls 2- by measuring the size of Earth\'s shadow on the Moon in a lunar eclipse

3-b mrng th mxmum lttud f th Sun n tw ts t dffrnt lttuds 4- by sending fleets of ships around Earth

Wht d th struturs f Stnhng, th Tml Mr, th Sun Dggr, nd th Bg Hrn Mdn Whl ll hv n mmn?

1- They were all places used for religious sacrifice 2- they were all built on the orders of ancient Mediterranean kings

3- They all can be used as lunar calendars 4- they were all used by ancient people for astronomical observations

Wht quntts ds ngulr mmntum dnd un?

1- mass and velocity 2- mass, velocity and radius 3- force and radius 4- force, velocity and radius

Whn n tm lss n ltrn, t bms?

1- sublimated 2- dissociated 3- ionized 4- an isotope  

Hw muh ltrl hrg ds n tm wth 6 rtns, 6 nutrns, nd 5 ltrns hv?

1- a total charge of +17 2- a negative charge of -5 3-a positive charge of +7 4-a positive charge of +1

Solution

What is the acceleration of gravity of Earth?

Answer: 1) - 9.8 m/s2 dwnwrd  

Note: Acceleration =Velocity /Time

The unit is (m/s) /s = m/s^2

The value of acceleration due to gravity at the earth\'s surface is found to be  9.8 m/s2 .

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Why wr nnt ppls unbl t dtt stllr prllx?

Answer: 5- Thy dd nt hv th blty t msur vry smll ngls.

Note: Stllr prllx could not be  observed until the 19th century They do not have the precisely measuring equipment for small angles.

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Wht quntts ds ngulr mmntum dnd un?

Answer: 2- mass, velocity and radius

Note: Angulr mmntum =Moment of inertia * Angular velocity

Moment of inertia depends on Mass and radius .

So ngulr mmntum dnds un mass, velocity and radius.

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Whn n tm lss n ltrn, t bms?

3- ionized  

Note: Losing of electrons results in Ionozation of atoms.Ex:Cl-,Al+3

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Hw muh ltrl hrg ds n tm wth 6 rtns, 6 nutrns, nd 5 ltrns hv?

Answer: 4-a positive charge of +1

Note: Net charge = 6* 1 + 6 * 0 +5*-1 = 6+0-5 =6-5 = +1