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1. ### How is the index of refraction related to the speed of light?

...distance. In other words T = S/c > S/C = t. NOTE: This is important. The speed of light remains at ...

1 Answers · Science & Mathematics · 28/07/2018

2. ### How do balloons float?

...the balloon pushes the balloon up. The difference is the buoyancy. Note again, you do not understand any of buoyancy at this stage. The basic point ...

4 Answers · Science & Mathematics · 27/07/2018

3. ### Why does Niels Bohr get credited for finding the answer to the question "Why didn't the negatively charged particles rush into the posit..."?

...idea. One which is still being developed to this day. Note that this does not discount the idea of firing a high velocity electron at...

3 Answers · Science & Mathematics · 04/07/2018

4. ### Find the work done by gravity if a 12 000 kg space probe originally 2500 km above the earth falls so that it is only 1200 km above the earth?

... = 12000*9.8*(2500 - 1200)*1000 = 1.5288E+11 Joules. ANS. NOTE: I assumed g = constant for simplicity. I practice though the g value...

3 Answers · Science & Mathematics · 21/05/2018

5. ### I am having a lot of trouble with this physics question: Determine the error formula for y=3x^4?

...δx The fraction errors are δx/x and δy/y. Note that 12x³ = 4(3x⁴)/x = 4y/x δy ≈ 12x³δx . . = (4y/x...

3 Answers · Science & Mathematics · 18/05/2018

6. ### Connection between centripital acceleration, radius, and linear velocity?

...2*(300 - 10*n)^2/(300 - 10*n) = m*(49/900)*(300 - 10*n) Newtons Now note as n gets larger 300 - 10*n gets smaller hence ...

1 Answers · Science & Mathematics · 04/04/2018

7. ### Physics question?

... 4 has charge Q = CV = 4 x 60V = 240C Note the total charge remains the same (360+240=600).

1 Answers · Science & Mathematics · 05/02/2018

...s size of the impulse = size of change in momentum = 27.2304 ≈ 27.2 kgm/s ANS* Note: kgm/s ≡ N-s

1 Answers · Science & Mathematics · 25/01/2018

9. ### PHYSICS HELP PLS?

s_vert = y = s0 + ut + (a/2)t^2 y = 5 - 4.905t^2 s0 = 5 height of target and blowgun u = initial velocity (vertically = 0) a = -9.81 m/s^2 (vertical acceleration downward due to gravity) horiz s = 10 = 0 + 35t t = 0.286 s vert s = 5 - 4.905(0.286)^2 s = 4.6 m (height on wall) horiz 10 = 35 cos x t t = 0.286 / cos x s = 5 = 5 + 35 sin x (0.286 / cos x) - 4.905(0.286 / cos x)^2...

1 Answers · Science & Mathematics · 19/01/2018

10. ### Speed and time for a model rocket to reach 20.00 m?

2. How long does it take to reach h = 20 m? 20 = Vo*t-g/2*t^2 20-30t+4.903t^2 = 0 t = (30±√30^2-20*19.612)/9.806 = 0.7614 sec ascending ; 5.3573 sec descending 1. How fast is the rocket traveling when it reaches a height of 20.00 m? V1...

1 Answers · Science & Mathematics · 15/01/2018