Physical Science Books Physics

physics question..plz..help?

two 3.0 kg physical science textbooks on a bookshelf are 0.15 m apart. What is the magnitude of the gravitational attraction between the books?

Step 1.) Find which equation to use. This problem gives you 2 masses, distance, and it requires you to find “gravitational attraction”. The best equation to use is F = G * (m1 * m2)/r^2.

Step 2.) Plug the equation in. G is the gravitational constant, which equals to 6.674×10−11 N m^2 *kg^-2. Two 3 kilogram science textbooks represent two masses, m1 and m2. 0.15 meters is the distance between the books, which represents r.

F = G * (m1 * m2)/r^2
= 6.674*10^-11* (3*3)/(0.15)^2
= 2.67 * 10^-8 N

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