please. help mw with his physics 20 (grade11) quiz

I HAVE A TIME LIMIT

Question 8 The separation, delta d , between m and M, and the values of m and M, can be easily measur Time left 2:58:40 Not yet answered torsion balance. From the deflection of the laser beam, the force of gravity, Fo, between the masses can be determined. Marked out of 1.00 deflection Flag fibre from zero question support calibrated torsion fibre scale laser beam mirror Om separation Ad m movable rod The correct relationship (as shown from the four choices below) for calculating the universal gravitational constant, G, using these physical quantities, is selection 4 m M F,mM a. G = - C. F, (Ad) 2 (Ad) 2 F (Ad) 2 b. G = - (Ad) 2 m M d G F.mMTime left 2:58:34 Question 9 Mercury has a mass of 3.30 x 1023 kg and a radius of 2.44 x 10 m. The gravitational field strength on the Not yet answered surface of Mercury is Marked out of Answer in units of "N/kg" 1.00 Flag Round your answer to the nearest 0.1 N/kg questionQuestion 10 Below are four graphs: Not yet answered a) b) Marked out of 1.00 Flag question c) d) Which of the graphs best represents the relationship between gravitational field strength (y-axis) vs. separation distance (x-axis) V a b