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**for**the rock to fall "t"; then the time**for**the sound to return from the bottom of...3 Answers · Science & Mathematics · 14/09/2019

This is just a straightforward kinematics problem. You just

**need**to take care with the units. I use the suvat symbols. s = displacement...2 Answers · Science & Mathematics · 25/09/2019

... running the second the baseball was hit.

**Speed**d ÷ = 69.7 ÷ *([(-√568.792 – 14 * √3)] ÷ 9.8 This is approximately 14.3 seconds. I hope this is helpful**for**you.3 Answers · Science & Mathematics · 25/06/2019

... very far apart. Assume they both have the same

**speed**v, and are moving toward each other. Then...kinetic energy = 1/2 mv^2 + 1/2m v^2 = mv^2 --> solve**for**v v = sqrt(U/m) = sqrt(k*q1*q2/(m*d)) = 658.6 m/s...1 Answers · Science & Mathematics · 23/05/2019

...behave that way, the path lengths will vary according to the orbital. you

**need**to define a unit distance**for**a root-mean square "revolution" and divide the**speed**of light by that value to get the average rpm. It is not obvious to ...3 Answers · Science & Mathematics · 18/09/2019

...

**for**t and then double it (up then down). I'll leave that**for**you if you're interested. iii) Now I think we WILL**need**to find the maximum height. H = h0 + v² / 2g = 3m + (25m/s)² / 19...3 Answers · Science & Mathematics · 08/02/2020

No one is answering 8 questions

**for**10 points, maybe list each question individually. The solution to number 1 is in the Comment section3 Answers · Science & Mathematics · 03/09/2019

...in what you know and find the remaining value.

**For**2 how I do it is that both objects...and they must both reflect off it with their relative**speeds**unaltered. The earth and the**speed**in the earth frame...1 Answers · Science & Mathematics · 29/06/2019

...h*f = hc/wl where f = frequency, wl = wavelength of photon, c =

**speed**of light and h = unknown Planck constant. Now... where W = work function of Cesium**For**wl = wl2 = 200nm, the electron has 4.11 eV of...1 Answers · Science & Mathematics · 06/02/2020

d = (1/2)(a)(t^2) = 10.80 = (1/2)(9.81)(t^2). Time to hit the ground, t = 1.48 s. Horizontally, d = vt. v = d / t = 3.9 / 1.48 = 2.63 m/s.

1 Answers · Science & Mathematics · 26/01/2020

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