Question

please answer these questions

Answer 1

here's your 3rd answer

Answer 2

1)a

F = G mm/r²

Masses is halved,

F =  Gm*m/2*2/r²

= GM²/4r²

It becomes Quartered.

1)b

F = G mm/r²

Distance is 4 r,

F = G mm/(4r)²

= G mm/16r²

= It is becomes weaker by 16 times OR by 2⁻⁴ times.

2)

M₁ = 20 kg

M₂ = 20 kg

r = 50 cm = 0.5 m

F = 6.67* 10⁻¹¹*20*20/0.5²

= 6.67*10⁻¹¹*400/0.25

2668*10⁻¹¹/0.25

=10672*10⁻¹¹

3)

• Small g is a variable, Its units are m/s²

• Capital G is Constant. Its units are Nm²kg⁻²

4)

Mass = 75kg

Weight on Earth = m*9.8

=75*9.8 = 735 Newtons

Weight on moon = Weight on earth/6

=735/6 = 122.5 Newtons

5)

Downward movement under the only force of gravity is Free fall.

h=ut-gt²/2

v=u - gt

v²- u²=- 2gh

It is minus because it is going upward