6. (a) What is a parking orbit? (b) State the uses of a geostationary satellite. 7. A missile aimed at a target on a wall 12.5 m high is fired at 24.0 m s?¹. Determine and state whether or not the target will be hit when the angle of projection is 40°. [g = 10 m s?²] PART II [45 marks] Answer three questions from this part. All questions carry equal marks. 8. (a) Explain the term moment of forces. (b) A uniform metal tube of length 10 m and mass 100 kg is suspended horizontally by two flexible cords attached at 100 cm and 300 cm respectively from the ends of the tube. Find the tension in each of the cords. [g = 10 m s?²] (c) (i) With the aid of a diagram explain two types of equilibrium. (ii) State two examples of couple. (d) A uniform cylindrical object with height 0.8 m and base diameter 0.4 m is placed on an inclined plane. If the plane makes an angle ? with the horizontal such that it is just enough to make the object topple, calculate the value of ?. 9. (a) Explain the statement the linear expansivity of a body is 3.0 × 10?? K?¹. (b) Explain why power lines are always connected in sag. (c) An iron tyre of diameter 60 cm, at 20 °C is to be shrunk onto a wheel of diameter 60.45 cm. If the tyre is to be heated to a temperature T so as to slip over the wheel, calculate T. [Linear expansivity of iron = 1.2 × 10?? K?¹] (d) State two merits each of: (i) Thermoelectric thermometer; (ii) Constant volume gas thermometer.
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(a) A parking orbit is a temporary orbit used during the launch of a satellite or other space probe. A spacecraft will first launch into a parking orbit, then make a second burn to go into its final orbit. (b) Geostationary satellites are used for various Show more…
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I need help on number 5
Kajal R.
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Umar Sohail Q.
( a ) a box of mass 10.3kg is at the bottom of a slope inclined at 30.0 degrees to the horizontal. the box is given a push so that it slides up the slope with initial speed 3.89ms?1. It stops when its vertical height has increased by 0.600m, before sliding back down the slope. ( i ) determine the magnitude of the friction force acting on the box, assuming that this force is constant. ( ii ) assuming that the friction force has the same magnitude on the way down the slope calculate the speed of the box when it reaches the bottom of the slope. ( b ) a space probe with mass 1.0×10^3kg is in transit to the outer solar system with a speed of 2.25×10^3ms?1 when it undergoes a course correction. ( i ) the engines apply a force of 1.5×10^4N at an angle of 45 degrees to the direction of travel for a period of 5.0×10^2s. calculate the final speed of the probe. ( ii ) the probe undergoes a gravitational sling-shot manoeuvre. it approaches the planet Mars head on with the speed calculated in part (i) and after the manoeuvre is travelling in the opposite direction. Mars is moving towards the probe with a speed of 1.3×10^4ms?1. state wether the interaction is elastic or not, giving your reasons. calculate the final speed of the probe. ( iii ) the probe ends its journey by landing on Titan after several braking manoeuvres. the drag force on the probe in Titan’s atmosphere is given by FD=12CApv^2 where C is the drag coefficient, A is the area of the probe (1m^2), and p=5.0kgm^?3. determine the units of C. calculate the terminal velocity of the space probe as it passes through the atmosphere if the acceleration due to gravity is 1.4ms^?2 and C has the value 0.45 in the units you just calculated.
Urvashi A.
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