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phys2425c

# phys2425c - Name Section REVIEW Chapters 13 16 PHYS 2425...

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Name: Section: R E V I E W Chapters 13 - 16 PHYS 2425 - Brooks Select the response that best answers the given statement. Be sure to write all final multiple choice answers on your Scantron answer sheet. 1. Four particles, each with mass m, are arranged symmetrically about the origin on the x axis. A fifth particle, with mass M , is on the y axis. The direction of the gravitational force on M is: A) B) C) D) E) none of these directions 2. If Earth were to rotate only 100 times per year about its axis: A) airplanes flying west to east would make better time B) we would fly off Earth's surface C) our apparent weight would slightly increase D) Earth's atmosphere would float into outer space E) our apparent weight would slightly decrease 3. The mass of a hypothetical planet is 1/100 that of Earth and its radius is 1/4 that of Earth. If a person weighs 600 N on Earth, what would he weigh on this planet? A) 24 N B) 48 N C) 96 N D) 192 N E) 600 N

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4. An object at the surface of Earth (at a distance R from the center of Earth) weighs 90 N. Its weight at a distance 3 R from the center of Earth is: A) 10 N B) 30 N C) 90 N D) 270 N E) 810 N 5. A spherical shell has inner radius R 1 , outer radius R 2 , and mass M , distributed uniformly throughout the shell. The magnitude of the gravitational force exerted on the shell by a point particle of mass m , located a distance d from the center, outside the inner radius and inside the outer radius, is: A) 0 B) GMm / d 2 C) () 33 2 / GMm R d D) ( 332 12 / GMm d R d R d −− ) 1 E) 1 / GMm d R 6. Each of the four corners of a square with edge a is occupied by a point mass m . There is a fifth mass, also m , at the center of the square. To remove the mass from the center to a point far away the work that must be done be an external agent is given by: A) 4 Gm 2 / a B) –4 Gm 2 / a C) 2 42 / Gm a D) 2 / Gm a E) 4 Gm 2 / a 2 7. The escape velocity at the surface of Earth is approximately 8 km/s. What is the mass, in units of Earth's mass, of a planet with twice the radius of Earth for which the escape speed is twice that for Earth? A) 2 B) 4 C) 8 D) 1/2 E) 1/4
8. Neglecting air resistance, a 1.0-kg projectile has an escape velocity of about 11 km/s at the surface of Earth. The corresponding escape velocity for a 2.0 kg projectile is: A) 3.5 km/s B) 5.5 km/s C) 7.1 km/s D) 10 km/s E) 11 km/s 9. A planet travels in an elliptical orbit about a star as shown. At what pair of points is the speed of the planet the same? A) W and S B) P and T C) P and R D) Q and U E) Vand R 10. Planet 1 and planet 2 are both in circular orbits around the same central star. The orbit of planet 2 has a radius that is much larger than the radius of the orbit of planet 1. This means that: A) the period of planet 1 is greater than the period of planet 2 and the speed of planet 1 is greater than the speed of planet 2 B) the period of planet 1 is greater than the period of planet 2 and the speed of planet 1 is less than the speed of planet 2 C) the period of planet 1 is less than the period of planet 2 and the speed of planet 1 is less than the speed of planet 2 D) the period of planet 1 is less than the period of planet 2 and the speed of planet 1 is greater than the speed of planet 2

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phys2425c - Name Section REVIEW Chapters 13 16 PHYS 2425...

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