The gravitational field intensity at a point is defined as: a) Force experienced by a unit mass placed at that point b) Work done in bringing a unit mass from infinity to that point c) Potential energy per unit mass at that point d) None of the above
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- it is said that people often behave in unusual ways during a full moon. a calculate the gravitational force that the moon would exert on a 50.0kg student in your physics class. The moon is 3.84x 10^8 m away from Earth and has a mass of 7.35x10^22 kgSuppose Google wants to launch a surveillance satellite to invade the privacy of all their users. They need it to revolve around Earth 10.0 times a day for maximum invasive efficiency. a) Draw a free-body diagram b) What should the radius of its orbit be if we neglect the presence of the Moon? c) How fast is it traveling? G = 6.67 * 10 ^-11 N*m^2/kg^2 M earth = 5.97 * 10^24 kg1. What is the gravitational potential energy in a system of three objects with masses m₁ = 2.0 × 1020 kg, m2 = 4.0 × 1020 kg, and m3 1.0 × 1021 located at r₁ = 2.0 × 10¹3 m 1.0 × 106 m -1.3 × 10¹2 m 1 respectively? 9 r2 = -6.0 × 10¹3 m 2.2 × 10¹² m –5.7 × 10³ m {] 9 T3 = = 1.5 × 10¹1 m −6.5 × 10² m 9.2 × 10¹0 m
- Determine the gravitational force F which the titanium sphere exerts on the copper sphere. The value of R is 40 mm. Assume a = 5.0, b = 2.7, 0-38. y 1 j) (108) N aR Titanium Answer: F = (i R Copper bR -x i+ ia) What is the total energy needed to place a 2.0 x 103 kg satellite into circular Earth orbit at an altitude of 5.0 x 102 km? b) How much additional energy would have to be supplied to the satellite once it was in orbit, to allow it to escape from Earth’s gravitational field?3) A peregrine falcon surveys the landscape. It flaps its wings to maintain a constant speed of 10 m/s and a constant elevation of 100 m above the flat ground. What is the primary energy transformation taking place? a) Ug→ K b) Echem→ K c) W→ K d) Echem→ Ug e) Echem →K+ Ug f) Echem → Ethermal 4) The 0.8 kg peregrine falcon tucks it wings and stoops, reaching a terminal velocity of 90 m/s. What is the power dissipated by air drag while this bird is falling at terminal velocity? a) OW b) 90 W c) 706 W d) 720 W e) 784 W f) 3240 W
- What is the height of an object that has a mass of 3.50 kg and a gravitational potential energy of 546 J? Select one: O a. b. 15.9 m 156 m C. 1530 m O d. 1911 mOne correct comparison between the electrostatic force and the gravitational force is that (a) gravitational force is greater than the electrostatic force (b) the gravitational force increases with the increasing distance between two masses (c) gravitational force is always attractive (d) the electrostatic force is always repulsive6. A 1500 kg satellite is in orbit 250 km above Earth's surface (v = 7756 m/s). Find work needed to place satellite into orbit, 800 km above Earth's surface (v = 7453 m/s)