help maths i need help please i cant do this queston

[amd4lif3]

7. Using algebra to solve scientific problems (D2)

(a) In Physics the gravitational force F (unit: newton) between two particles is given by:

F= G m1 m2 / r2



where m1 and m2 are the masses (unit: kilogramme), r is the separation of the masses (unit: metre) and G is the universal gravitational constant with the value 6.673 x 10-11 Nm2kg-2

Calculate the force of gravitational attraction between two protons 2 x 10-15 m apart in a nucleus. Each proton has a mass of 1.673 x 10-27 kg.

(6.673x10-11)(1.673x10-27)(1.673x10-27)/(10-15)2= 1.867725322x10-34
= 1.87x10-34

 

[alexoiu]

OK, and what's the problem?

 

[zeyuanfu]

Google?

 

[Pinhedd]

7. Using algebra to solve scientific problems (D2)

(a) In Physics the gravitational force F (unit: newton) between two particles is given by:

F= G m1 m2 / r2



where m1 and m2 are the masses (unit: kilogramme), r is the separation of the masses (unit: metre) and G is the universal gravitational constant with the value 6.673 x 10-11 Nm2kg-2

Calculate the force of gravitational attraction between two protons 2 x 10-15 m apart in a nucleus. Each proton has a mass of 1.673 x 10-27 kg.

(6.673x10-11)(1.673x10-27)(1.673x10-27)/(10-15)2= 1.867725322x10-34
= 1.87x10-34

I get 4.669E-35 newtons

((6.673E-11)(1.673E-27)(1.673E-27))/((2E-15)(2E-15))

Your numerator is fine, but your denominator is wrong

 

[amd4lif3]

so this is correct

(1.673x10-27) x (1.673x10-27) = 6.9973225x10-25
(2x 10-15)2

(6.9973225x10-25) x (6.673x10-11) = 4.669313304x10-35

 

[amd4lif3]

thank you sooo much

 

[Pinhedd]

You're welcoime. My recommendation is to write everything in big-E notation like I did, it will make your expressions much easier to read and reduce human errors. Get into the habit of doing this because it will make all of the difference on written exams.

aEb = a * 10^b

Please note that big-E notation is not related to the natural exponential function e^x