0 The accelenation due to Planet A is one-sisth whan it is on Planet 1s, the Pla

Question

0 The accelenation due to Planet A is one-sisth whan it is on Planet 1s, the Planet A is one-finarth that of Planet B The mass of Planct A is what fraction of he mass of B) 1/16 2) A small car meshes with a large track in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision it emen mere could h. mo-han ne mmt A) The truck experiences the greater magnitude momentum change B) The small car experiences the greater magnitude momentum change. C) The small car and the truck experience the same D) The magnitade of the momentum change experienced by each one is inversely proportional to its mass magnitnule of the momentum change experienced by each one is directly proportional to its mass. quantities are units of impalse? (There could be more than one correct choice.) E) The A) N m C) kg·m/s D)N S E) kg-m, 2/s2 4) If a quantity you calculated had units of kg-m/swhat type of quantity could it be? (There could be more than one correct choice.) A) momentum B) kinetic energy C) work D) impulse E) force 5) Two planets have the same surface gravity, but planet B has twice the mass of planet A. If planet A has radius r. what is the radius of planet B? A) /2 E) 2r B)r D) 4r 6) Two objects of different mass have equal, non-zero kinetic energies. Which object has the greater magnitude A) the heavier object C) They both have the same magnitude momentum B) the lighter object 7) Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force on each one is F. The masses are changed to 2m and 2.M, and the distance is changed to 4r What is the magnitude of the new gravitational force? C) 16F D) 4F A) F16 E) F/2 B) F4 8) If you stood on a planet having a mass four times that of Earth's mass, and a radius two times that of Earth's radius, you would weigh A) the same as you do on Earth. B) two times more than you do on Earth. C) two times less than you do on Earth. D) four times more than you do on Earth.

Explanation / Answer

1. gA = gB/6

and g = G M / R^2

G MA / RA^2 = G MB / 6 RB^2

MA / MB = (RA/RB)^2 / 6 = (1/4)^2 / 6 =1/96

Ans(D)

2. momentum change = impulse = F t

Magnitude force is same (from Newton's third law)

time will be same/

hence momentum change will be same for both.

Ans(c)

3. Impulse = F t = m delta(v)

N-s Or kg m/s

Ans(C & D)

4. kg m/s = momentum  

if change in momentum then impulse.

Ans(A & D)

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