Two particles have a mass of 7.2 kg and 13.0 kg, respectively. Part A If they ar

Question

Two particles have a mass of 7.2 kg and 13.0 kg, respectively. Part A If they are 800 mm apart, determine the force of gravity acting between them. Express your answer to three significant figures and include the appropriate units. Part B Compare the result with of each particle. Find weight of the first particle. Express your answer to three significant figures and include the appropriate units. Part C Find weight of the second particle. Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

Part A : The gravtiational force between two particles of mass m1 and m2 separated by distance d is given by

F = Gm1m2/d2

G = Gravitational constant = 6.674*10-11 m3/kg-s2

Here, m1=7.2 kg ; m2 = 13 kg; d = 800mm=0.8m

Substituting these values in above equation, we get

F =  (6.674*10-11*7.2*13)/0.82 =9.76*10-9 N

Part B :

Weight of first particle = m1*acceleration due to gravity = 7.2*9.8 = 70.56 N

the weight is very high compared to gravitaional force of part A

Part C :

Weight of second particle = m2*acceleration due to gravity = 13*9.8 = 127.4 N

the weight is very high compared to gravitaional force of part A

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