# AP Physics C Textbook Problems

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1 AP Physics C Textbook Problems Chapter 13 Pages HW-16: 03. A 200-kg object and a 500-kg object are separated by m. Find the net gravitational force exerted by these objects on a 50.0-kg object placed midway between them. F = F L + F R = - G m L m 0 / r L0 ² + G m R m 0 / r L0 ² = G ( - m L / r L0 ² + m R / r R0 ²) m 0 = (6.673 x ) [ - (200) / (0.2)² + (500) / (0.2)² ] (50) = x 10-5 = 2.50 x 10-5 N, toward the 500-kg object At what position (other than an infinitely remote one) can the 50.0-kg object be placed so as to experience a net force of zero? Anywhere that: 500 / x² = 200 / (0.4 x)² 2 x² = 5 (x² x ) = 5x² - 4 x x² - 4 x = 0 x 1 = m = distance from 500-kg object x 2 = m = distance from 300-kg object 05. Three uniform spheres of mass 2.00 kg, 4.00 kg, and 6.00 kg are placed at the corners of a right triangle as shown in the figure at the right. Calculate the resultant gravitational force on the 4.00-kg object, assuming the spheres are isolated from the rest of the universe. F 24 = G m 2 m 4 / r 24 ² = (6.673 x ) (2) (4) / (3)² = x 10-11, +y direction F 64 = G m 6 m 4 / r 64 ² = (6.673 x ) (6) (4) / (4)² = x 10-10, -x direction F = (-100 i j) pn 07. In introductory physics laboratories, a typical Cavendish balance for measuring the gravitational constant G uses lead spheres with masses of 1.50 kg and 15.0 g whose centers are separated by 4.50 cm. Calculate the gravitational force between these spheres, treating each as a particle located at the center of the sphere. F 12 = G m 1 m 2 / r 12 ² = (6.673 x ) (1.5) (0.015) / (0.045)² = 7.41 x N 09. When a falling meteoroid is at a distance above the Earth s surface of 3.00 times the Earth s radius, what is its acceleration due to the Earth s gravitation? a E = G m E / (4 r E )² = (6.673 x ) (5.98 x ) / (4 x 6.37 x 10 6 )² = = m/s², toward the Earth

2 11. On the way to the Moon the Apollo astronauts reached a point where the Moon s gravitational pull became stronger than the Earth s. Determine the distance of this point from the center of the Earth. M E / R ES ² = M M / R MS ² R MS ² = R ES ² (M M / M E ) = (R ES )² (7.36) / (598) = R ES ² / R MS = R ES / R MS + R ES = 3.84 x 10 8 = R ES / R ES = R ES (1 / ) = R ES R ES = 3.84 x 10 8 / = x 10 8 = 3.46 x 10 8 m What is the acceleration due to the Earth s gravitation at this point? a E = G m E / ( x 10 8 )² = (6.673 x ) (5.98 x ) / ( x 10 8 )² = x 10-3 m/s² HW-17: 13. Plaskett s binary system consists of two stars revolving in a circular orbit about a center of mass midway between them. This means that the masses of the two stars are equal. Assume the orbital speed of each star is 220 km/s and the orbital period of each is 14.4 days. Find the mass M of each star. (For comparison purposes, the mass of our Sun is 1.99 x kg.) Centripetal Force: Gravitational Force: Equating the two forces: M = 4 v² r / G Now, the distance traveled in orbit is: 2 π r = v T r = v T / (2 π) M v² / r G M M / (2 r)² Mv² / r = G M² / (4r²) M = (4 v² / G) (v T / 2 π) = (2 v³ T) / (π G) = (2) (220,000)³ (14.4 x 24 x 3600) / π / G = x / x / π = 1.26 x kg 17. Comet Halley approaches the Sun to within AU, and its orbital period is 75.6 years. (AU is the symbol for astronomical unit, where 1 AU = 1.50 x m is the mean Earth-Sun distance.) How far from the Sun will Halley s comet travel before it starts it return journey? semi-major axis of orbit: a = (0.570 AU + y) / 2 Note that since T² = k a³: when we measure T in terms of Earth years a in terms of AU we have k = 1 T² = k a³ (75.6)² = (1) ( y)³ / 8 ( y)³ = 8 (75.6)² = y = y = AU = 35.2 AU

3 19. A synchronous satellite, which always remains above the same point on a planet s equator, is put in orbit around Jupiter to study the famous red spot. Jupiter rotates about its axis once every 9.84 h. Use the data in the table below to find the altitude of the satellite. Centripetal Force: M S v² / r = M S [ 2π (R J + y) / T ]² / (R J + y) = 4π² M S (R J + y) / T² Gravitational Force: G M S M J / r² = G M S M J / (R J + y)² Equating the two forces: 4π² M S (R J + y) / T² = G M S M J / (R J + y)² 4π² / T² = G M J / (R J + y)³ (R J + y)³ = G M J T² / (4 π²) = (6.673 x ) (1.90 x ) (9.84 x 3600)² / (4π²) = x (R J + y) = x 10 8 (6.99 x 10 7 ) + y = x 10 7 m 21. Suppose the Sun s gravity were switched off. The planets would leave their nearly circular orbits and fly away in straight lines, as described by Newton s first law. Would Mercury ever be further from the Sun than Pluto? If so, find how long it would take for Mercury to achieve this passage. If not, give a convincing argument that Pluto is always further from the Sun. Centripetal Force: M P v² / r Gravitational Force: G M S M P / r² Equating the two forces: G M S M P / r² = M P v² / r v² = G M S / r For Mercury: v² = G M S / r = (6.673 x ) (1.991 x ) / (5.79 x ) = x 10 9 v = 47,902 m/s For Pluto: v² = G M S / r = (6.673 x ) (1.991 x ) / (5.91 x ) = x 10 7 v = 4,741 m/s With greater speed, Mercury will ultimately move further from the Sun than Pluto. (Mercury distance from sun)² = d M0 ² + (v M t)² (Pluto distance from sun)² = d P0 ² + (v P t)² d M0 ² + (v M t)² = d P0 ² + (v P t)² (d p0 ² - d M0 ²) = (v M ² - v P ²) t² t² = (d p0 ² - d M0 ²) / (v M ² - v P ²) = [(5.91 x )² - (5.79 x )²] / [( ) x 10 7 ] = ( x ) / ( x 10 7 ) = x t = x 10 8 s = 34,439 hr = 1435 days = 3.93 years Answer book indicates 393 years

4 HW-18: 23. Three objects of equal mass are located at three corners of a square of edge length l as shown in the figure at the right. Find the gravitational field at the fourth corner due to these objects. g = (G m / l²) j + (G m / 2 l²) (cos 45 i + cos 45 j) + (G m / l²) i = (G m / l²) (1 + ½ cos 45) (i + j) = (G m / l²) (1 + (2) / 4) (i + j) g ² = (G m / l²)² (2) (1 + (2) / 4 )² = (G m / l²)² (2) ( (2) + 2 / 4 )² = g = (G m / l²) ( (2) + ½), toward the opposite corner 25. Compute the magnitude and direction of the gravitational field at a point P on the perpendicular bisector of the line joining two objects of equal mass separated by a distance 2a as shown in the figure at the right. Let l² = a² + r² g = (G M / l²) ( - cos ϴ i + sin ϴ j) + (G m / l²) ( - cos ϴ i - sin ϴ j) = - 2 (G M / l²) cos ϴ i = - 2 (G M / l²) (r / l) i g = 2 G M r / l³, in the x direction 27. How much energy is required to move a 1000 kg object from the Earth s surface to an altitude twice the Earth s radius? For object far removed from the Earth s surface: U = - G M m / r U = U(3 R E ) - U( R E ) = - G M m [ (1 / 3R E ) - ( 1 / R E ) ] = - (G M m / R E ) (1/3 1) = (2/3) (G M m / R E ) U = (2/3) (6.673 x ) (5.98 x ) (10³) / (6.37 x 10 6 ) = x J 29. After our Sun exhausts its nuclear fuel, its ultimate fate may be to collapse to a white dwarf state, in which it has approximately the same mass as it has now, but a radius equal to the radius of the Earth. Calculate (c) the average density of the white dwarf, ρ = M S / V = M S / [(4/3) π R E ³] = (1.991 x ) / (4/3) / π / (6.37 x 10 6 )³ = x = 1.84 x 10 9 kg/m³ the free-fall acceleration, and g = G M S / R E ² = (6.673 x ) (1.991 x ) / (6.37 x 10 6 )² = x 10 7 = 3.27 x 10 6 m/s² the gravitational potential energy of a 1.00-kg object at its surface. U = - G M S m / R E = - (6.673 x ) (1.991 x ) (1) / (6.37 x 10 6 ) = x J 31. A system consists of three particles, each of mass 5.00 g, located at the corners of an equilateral triangle with sides of 30.0 cm. Calculate the potential energy of the system. U total = U 12 + U 13 + U 23 = - 3 (G m 1 m 2 / r 12 ) = - (3) (6.673 x ) (0.005) (0.005) / (0.3) = x J If the particles are released simultaneously, where will they collide? At the center of the triangle.

5 HW-19: 33. A space probe is fired as a projectile from the Earth s surface with an initial speed of 2.00 x 10 4 m/s. What will its speed be when it is very far from the Earth? Ignore friction and the rotation of the Earth. E initial = ½ m v I ² - G M E m / r I E final = ½ m v F ² - G M E m / r F = E initial = ½ m v I ² - G M E m / r E ½ m v F ² = G M E m / r F + ½ m v I ² - G M E m / r E v F ² = 2 G M E / r F + v I ² - 2 G M E / r E = 0 + (2 x 10 4 )² - (2) (6.673 x ) (5.98 x ) / (6.37 x 10 6 ) = x 10 8 v F = 16,600 m/s 37. A satellite of mass 200 kg is placed in Earth orbit at a height of 200 km above the surface. With a circular orbit, how long does the satellite take to complete one orbit? mv² / r = G m M E / r² v² = G M E / r T = t = 2 π r / v T² = 4 π² r² / v = 4 π² r³ / G M E r = R E + 200,000 = 6.37 x x 10 6 = 6.57 x 10 6 m T² = (4 π²) (6.57 x 10 6 )³ / (6.673 x ) / (5.98 x ) = ( x ) / ( x ) = T = 5297 s = 88.3 min = 1.47 hr (c) What is the satellite s speed? v = 2 π r / T = (2π) (6.57 x 10 6 ) / (5297) = 7793 m/s What is the minimum energy input necessary to place this satellite in orbit? Ignore air resistance, but include the effect of the planet s daily rotation. E initial = ½ m v I ² - G M E m / r I E final = ½ m v F ² - G M E m / r F = E initial + E v I = (2π R E ) / (3600 x 24) = m/s r I = 6.37 x 10 6 m E = E final E initial = ½ m v F ² - G M E m / r F - ½ m v I ² + G M E m / r I = ½ m (v F ² - v I ²) + G M E m (1 / r I - 1 / r F ) = (0.5) (200) [ (7793)² - ( )² ] + (6.673 x ) (5.98 x ) (200) [ 1 / (6.37 x 10 6 ) - 1 / (6.57 x 10 6 ) ] = (100) ( x 10 7 ) + ( x ) ( x 10-9 ) = ( x 10 9 ) + ( x 10 8 ) = x 10 9 = 6.43 x 10 9 J 41. Determine the escape speed for a rocket on the far side of Ganymede, the largest of Jupiter s moons. The radius of Ganymede is 2.64 x 10 6 m, and its mass is x kg. The mass of Jupiter is 1.90 x kg and the distance between Jupiter and Ganymede is x 10 9 m. Be sure to include the gravitational effect due to Jupiter, but you may ignore the motion of Jupiter and Ganymede as they revolve about their center of mass. U Ganamede = - G M 1 M 2 / r = - (6.673 x ) (1.495 x ) (M 2 ) / (2.64 x 10 6 ) = - ( x 10 6 ) M 2 J = U Jupiter = - G M 1 M 2 / r = - (6.673 x ) (1.90 x ) (M 2 ) / (1.071 x 10 9 ) = - ( x 10 8 ) M 2 J U total = x 10 8 M 2 J - ( x 10 8 ) M 2 J Required Kinetic Energy = x 10 8 M 2 J = ½ M 2 v² v² = x 10 8 J v = x 10 4 = 15.6 km/s

6 45. A comet of mass 1.20 x kg moves in an elliptical orbit around the Sun. Its distance from the Sun ranges between AU and 50.0 AU. Note: 1 AU = one astronomical unit = the average distance from Sun to Earth = x m. (c) What is the eccentricity of its orbit? The semi-major axis is: ( ) / 2 AU AU = a a + c = 50 AU c = = AU e = c / a = / = = What is its period? T² = k a³ = (1) (25.25)³ = T = yr = 127 yr At aphelion what is the potential energy of the comet-sun system? U = - G M m / r = - (6.673 x ) (1.991 x ) (1.20 x ) / (50 x x ) = x = x J

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