You would like to know whether silicon will float in mercury and you know that can determine this based on their densities. unfortunately, you have the density of mercury in units of kilogrammeter3 and the density of silicon in other units: 2.33 gramcentimeter3. you decide to convert the density of silicon into units of kilogrammeter3 to perform the comparison. by which combination of conversion factors will you multiply 2.33 gramcentimeter3 to perform the unit conversion?

The answer is; by a factor of 1000

1 g/cm3 is equal to 1000 kilogram/cubic meter  or alternatively 0.001 g/cm3 is equal to 1 kg/m3 . Therefore to convert the 2.33 gramcentimeter3 to kgm3 then multiply it by 1000.

2.33 *1000 = 2330

2.33 gcm3 = 2330kgm3

i believe it is b. what was the cause of the big bang

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the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.