Recent content by anna sung

So f=mg=GmM/r^2 Then say the mass of Earth is 2. Planet x is 8 times of the earth, so then 16. Earth has gravity 9.8 and planet x has gravity 19.6. Then the equation is really this: g=m/r^2 So Earth is square root ( 2/9.8)=0.45 planet x is square root (16/19.6) = 0.903 Oh, okay yeah...

Isn't g universal gravitational constant which is 6.67 x 10^-11? Or is this where the 19.6m/s^2 should go into?

Homework Statement Planet X has a mass 8 times that of Earth and the acceleration due to gravity at its surface is 19.6 m/s2. The radius of the planet x compared to Earth is: The answer is 2times bigger Homework Equations Fg = gm1m2 / r^2 The Attempt at a Solution Is Earth's...

Homework Statement three objects carrying charges of (a)-4x10^-6 C, (B)-6x10^-6 C, and (c)+9x10^-6 C are placed in a line equally spaced from left to right by a distance of 0.5m. calculate the magnitude and direction of the net force acting on each. Homework Equations Force of the magnitude...

Homework Statement there is a virus that infects a baterium. the viral genome was a 5000base long rna strand and it contained 4 genes for attacking the bacterium and reproducing. this rna strand was placed in a test tube with free nucleotides to allow it to reproduce. thus after many repeated...

Homework Statement the frequency of the dark form (dominant) of mice is =.15 and the light form has 10% more mortality rate than the dark form mice. find the frequency of p and q for the next generation Homework Equations i am stuck here because i don't know the original number or i...

ah man..at lest i did the half correctly . thank you so much for help! it was a great help!

no!so that means in the end you were supposed to add both of the times and that is your final answer? cause this question was on my test i stopped at the kinematic equation.

what? wait. I am still confused so you mean the equation i did was the end. or i had to do add the time i got using the temperature?

wait. sorry i got wrong number from the calculator but the equation is right.right? and also so are you saying that i had to use the temperature. and find thae speed of the time and add it with the time i got from the kinematic equation or just what i did was the end?

Homework Statement a man dropped a stone into a can that is 120m deep. if the temperature of the air is 20degree celsius. how long would it take for a man to hear the sound when the stone hit the can? Homework Equations d=Vi*t + 1/2*a*t^2 The Attempt at a Solution since i know that...

okay thank you so much oh i got the answer it so easy...omg..thank you so much

0.0m/s? because it starts at rest?

sorry? df(t)? you mean vf(t)? velocity final multiply by time??

d= vf(t)-1/2a(t^2) this equation?