Concept explainers
A satellite describes an elliptic orbit about a planet of mass M. The minimum and maximum values of the distance r from the satellite to the center of the planet are, respectively, r1 and r2. Use the principles of conservation of energy and conservation of angular momentum to derive the relation
where h is the angular momentum per unit mass of the satellite and G is the constant of gravitation.
Want to see the full answer?
Check out a sample textbook solutionChapter 13 Solutions
Vector Mechanics For Engineers
- To understand how the conservation of energy and Newton's second law can be combined to solve kinetic problems. As shown, a large globe has a radius R and a frictionless surface. A small block with mass m starts sliding from rest at the top of the globe and slides along the globe’s surface. The block leaves the globe’s surface when it reaches a height hl above the ground. The system’s geometry is shown for an arbitrary height h. (Figure 1) Note that the subscripts used in this problem is the letter l and not the number 1. Consider what happens when the block leaves the globe’s surface. Which of the following statement or statements are correct? The net acceleration of the block is directed straight down. The component of the force of gravity toward the globe’s center is equal to the normal force’s magnitude. The force of gravity is the only force acting on the block.Consider what happens when the block leaves the globe’s surface. Which of the following statement or statements are…arrow_forwardA W disk = 5 lb disk is travelling around in a circle of radius ₁ with an initial tangential velocity of (UB)₁. The cord is pulled down through the hole at a constant velocity of ur. After a few seconds, the disk has a final speed of Vf. Neglect friction and the size of the ball. F|VI| T2 = t= UT B (VB)₁ T1 MB Values for the figure are given in the following table. Note the figure may not be to scale. Variable Value ft 15 (VB)₁ 5 r₁ ft S 2.5 ft ft S 4.5 12 S Vr a. Determine the tangential component of the velocity of the disk when it reaches its final speed, (V₂)+ b. Determine the radius of the rope from the disk to the hole when the disk reaches its final speed, 12. c. Determine the time required for the disk to reach its final speed, t. Round your final answers to 3 significant digits/figures. ft (V₂)t = S S A ftarrow_forwardA particle of momentum P1 collides with a particle at rest. After the collision, the particle initially at rest decays into two particles of momentum P3 and P4, respectively, while particle 1 continues in a straight line with momentum P1'. Knowing the magnitudes of all the momentum listed above and knowing that energy was not conserved during the process, find the angle θ (theta) between particles 3 and 4.arrow_forward
- Two blocks 1 and 2 are connected by a rope over a pulley as shown. The pulley is very light (massless) and rotates with essentially no friction. Calculate the mass of block 1, m1, given that the mass of block 2 is m2=5.5 kg and that block 2 moves and accelerates downwards at 3.57 m/s2 when θ=35∘ and μk=0.4. I think that I need to be using Newtons second law but I just dont know how to solve this. Can you please help?arrow_forwardA 300-mm cantilever beam BC with uniform cross section A-A is supporting an inclined 225-N force acting on the top of the beam at C as shown below. Y B A4 A+ 225 N 300 mm 3 X 10 mm 30 mm 10 mm Section A-A 2← y -10 mm 30 mm (a) Show that the second moment of area about the neutral axis of the cross section A-A is given by I = 267 500 mm 4. (b) Draw and label the normal-force, shear-force and bending-moment diagrams for the beam by analysing an appropriate free-body diagram. (c) Determine the maximum magnitude and y location of the normal stress at B (x whether it is compressive or tensile. = 0). Statearrow_forwardA satellite used in a cellular telephone network has a mass of 2380 kg and is in a circular orbit at a height of 850 km above the surface of the earth. Part A What is the gravitational force Fgrav on the satellite? Take the gravitational constant to be G = 6.67x10-11 N-m2/kg2, the mass of the earth to be me = 5.97x1024 kg, and the radius of the Earth to be re = 6.38×106 marrow_forward
- Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. Each step is of uniform height d. The mass of each object is a multiple of the base mass m: object1 has mass 4.00m, object 2 has mass 1.96m, and object 3 has mass m. When the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. If the objects are then relocated as shown, what is the new total potential energy of the system? Each answer requires the numerical coefficient to an 2 algebraic expression. Each algebraic expression is given using some combination of the variables m, g, and d, where g is the acceleration due to gravity. Enter only the numerical coefficient. (Example: If the answer is 1.23mgd, just enter 1.23)arrow_forward3) A small block of mass m slides frictionlessly in the given orbit. Calculate the magnitude of the resultant force acting on the block released at point A when it reaches point C. (g= 10 m/s², m= 1 kg) 76.48 N 30.41 N 60.83 N 91.25 N 3/10 50.99 N MONSTER h-4R D 10 pu CT Rarrow_forwardPravinbhaiarrow_forward
- Figure 2 G 0.75 m 2 m 1.5 m Figure 2 shows a 2000 kg lorry with a center of mass at G. Starting from rest, the lorry achieves a speed of 15 m/s under a constant acceleration after it has traveled 100 m. The front wheels are free to roll. Q8. What is the normal force of the wheels at A and B? (↑) (A) NA = 10.7 kN (B) NẠ=8.89 kN (C) NA= 8.89 kN (D) NA=10.7 kN Ng = 8,89 kN Ng = 10.7 kN Ng = 8,89 kN Ng = 10.7 kN Q11. Eccentric impact occurs when the line connecting the mass centers of the two bodies with the line of impact. (A) coincide (В) does not coincide (С) is parallel (D) is perpendicular Q12. Which of the following is not a conservative force? (A) Gravitational force (B) Elastic force (C) Frictional force (D) None of the abovearrow_forwardCan you please help me just with D, F,G harrow_forwardTwo objects with masses of 2.55 kg and 4.15 kg are connected by a light string that passes over a light frictionless pulley to form an Atwood machine. (a) Determine the tension in the string. (b) Determine the acceleration of each object. (c) Determine the distance each object will move in the first second of motion if they start from rest.arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY