Hi, would someone help me with ONLY Question b. iii and iv please. the rest is done. (the figure is on top of second page) Thank you

Advice on answering Question 4 This question relates to Topic 3, Parts 1, 2 and 3 All numerical answers in this question should be given to an aPP[QP'j'te number of significant figures. ; A scientist is investigating a proposed mission to the moon of another planet, in which an observation satellite will orbit the moon. It is planned that the satellite will be placed into a circular orbit about the moon at a distance of 1.8 x 10 m from its centre. One complete orbit will take 12.5 hours. What is the speed of the satellite in m s'? (3 marks) The satellite is held in orbit by the force of gravity. In no more than two sentences, explain how you know from its orbit that it must be being acted on by a force. (2 marks) As a result of the orbiting satellite, does the moon move? Explain your answer. (Advisory word count: 50 words) - (2 marks) As part of its mission, the satellite will drop a small lander onto the moon's surface. Write down an equation that relates the weight of an object to its mass. You must define any variables that you use. (1 mark) On Earth, the lander weighs 36 N. You are reminded that one new- tonis 1 kg m s | On the moon the lander will weigh 16 N. What is the acceleration due to gravity on the moon? On Earth take, gz = 9.81 m s72. (3 marks) At release, the vertical speed of the lander is zero. Neglecting all other forces except gravity, which you can assume to be constant, use your answer from part (b)(ii) to calculate the vertical speed of the lander after 300 s. RL/-?'H'{S'& ' _ (2 marks) Part way through its descent, the lander enters the moon''s thin atmosphere and a parachute is opened. Figure 2 below shows the lander before and after the parachute is opened. Copy the figure and show the forces acting on the lander in the two cases. (3 marks) ' (2Mem S) A noble Figure 2 For use with part (iv): the lander before and after the parachute is opened V. The air resistance caused by the parachute is proportional to both its surface area and the speed squared of the lander. The graph in Figure 3 shows the speed of the lander from the time the valfell parachute is opened. At point B, is the force due to air resistance greater than, less than or equal to the force due to air resistance at point A? In one sentence, explain your let llw lidia sielamas sno reasoning. (1 mark) speed of descent Do this vo no belos ghied of A le brow 06 ingon blow VozlybA B (ohsm S) or Beislen fant nollenpa as nwob athvy Up Wan ano is bebrimmer e time 1 96 artplow sonal aclass ) no emelienot Figure 3 For use with parts (v) and (vi): the descent speed of the moon lander as an function of time vi. At point C (shown on Figure 3), is the force due to air resistance greater than, less than or equal to the force due to gravity? In one sentence, explain your reasoning. gies al tabrisl edt to beege issthey ant Bessler Al (2 marks) ando ed olemuses ned Joy anw Vivele tacoxe esgiotorito lle onitoslash vii. Suppose that two parachutes are used to slow down the lander. mom lewers mov day In one sentence, explain how this might change the final descent speed of the lander. vili. In one sentence, explain how the density of an atmosphere changes with altitude. (1 mark) leseso owl erl ninebrisk ant ho philes asmiof ard worle bus stopit ent vood ix. In one sentence, explain how the change in atmospheric density will affect the (ism ) air resistance felt by the lander. (1 mark)