20. A satellite in a circular orbit of radius r around Mars experiences a force of- gravity of magnitude F exerted by Mars. The work done by this force on the satellite as it travels halfway around its orbit is Far b) e) a) 2Fr c) Fr d) Frr zero
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- A 54 kg person climbs a set of stairs at a constant speed up a height of 3.4 m in 32 s. Calculate the gravitational potential energy at the top of the stairs. a) 1.8 X 10² J b) 5.3 X 10² J c) 1.7 X 10³ J d) 1.8 X 10³ JA 5 kg ball is shot straight up with an initial speed of 20 m/s . When the ball reaches height 10 m, the balls speed is 10 m/s. The work done on the ball by the force of air resistance , up to this height is equal to? A- 260J B- 490J C- 500 J D- 510J E- 750J7. A student in a lab exerts a 25 N force to pull a block a distance of 48 cm. If a total of 11 J of work is done, the angle between the force and the displacement is a. 89° b. 66° d. 24° e. none of the above c. 61° 8. A 102-g sparrow flying at 12.3 m/s wishes to have equal kinetic and gravitational potential energies. The height that will accomplish this is a. 0.315 m b. 0.628 m d. 1.13 m e. 7.72 m c. 0.787 m 9. Earth's mass is 5.98 x 1024 kg. Calculate the value of g at a point 4.8 x 105 km from the centre of Earth. a. 9.8 × 102 N/kg b. 8.3 x 10' N/kg C. 1.7 × 103 N/kg d. 1.7 x 10³ N/kg e. 9.8 × 105 N/kg 10. A piece of paper becomes electrically charged when a charged rod of plastic is placed close to it. This is referred to as a. charging by a conductor b. charging by induction c. charging by an insulator A P d. charging by contact e. charging by electricity 20 cm Ꭰ T 20 cm 11. Four charged spheres, A, D, P, and T are arranged as shown below. Sphere A has a charge of +4.5 × 10*C,…
- A spaceship is launched vertically upward. The total work done on the spaceship is: A: positive B: negative C: cannot be determined with the information given D: negative at the beginning, and then zero as the space shuttle moves upward0 Question 1 The potential gravitational energy of a mass can be a negative value. True O False 1 ptsA 2.35-kg object initially at rest has a gravitational potential energy of 74.6 J. Determine the speed of the object when it has moved under the influence of gravity to a location where its gravitational potential energy is 50.0 J. m/s
- C7 9.) If the orbit is elliptical, rather than circular, what can be said about the work done by the Sun on Earth? a.) It does not matter whether the orbit is circular or elliptical, no work is done. b.) The work the Sun does on Earth causes the tides. c.) Whether the orbit is circular or elliptical, work must be done to propel Earth around the Sun. d.) If the orbit is elliptical, work is done to speed up or to slow down Earth, depending on its location in orbit. e.) The work the Sun does on Earth accounts for Earth's changes of season.A 1,060 kg meteor strikes the surface of the Moon. What is the work done (in J) on the meteor by the gravitational field of the Moon, if we assume the meteor comes from deep space? The work done by the Moon's gravitational field is equal to the negative of the change of potential energy of the meteor-Moon system. You can assume the meteor comes from infinitely far. What is the final distance of the meteor, if it lands on the Moon's surface? You will need to look up two physical characteristics of the Moon to solve this problem. JFind the work done in joules by gravity as an object of the mass m 5 kg is raised up at constant speed from a height h;=26 m to a height h2=69 m. Consider g = 10 m/s2 A. None B. -2150 D. -6450 E. -4300 O < O a OUO DOE
- An object with a mass of 15kg slides down an incline with a length of 6.0m at an angle of 28 degrees from horizontal. The coefficient of friction between the object and incline is 0.25 a) How much work does the gravitational force perform on the object? b) How much work does the frictional force perform on the object? c) What will its speed be as it reaches the bottom of the incline?A 2.30-kg object initially at rest has a gravitational potential energy of 74.0 J. Determine the speed of the object when it has moved under the influence of gravity to a location where its gravitational potential energy is 50.0 J. m/s