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1. ### Physics webassign help?

Welcome to Yahoo!Answers. Let's call the time 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

2. ### Physics Help!!!!?

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

3. ### A batter hits a fly ball which leaves the bat 0.98 m above the ground at an angle of 60 degree with initial speed 28 m/s?

... 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

4. ### Physics question with different numbers please include steps so i can answer the actual question?

... 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

5. ### What is the rpm of an electron whizzing around an atom?

...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

6. ### Projectile Question?

... 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

7. ### I need help with my physics test?

No one is answering 8 questions for 10 points, maybe list each question individually. The solution to number 1 is in the Comment section

3 Answers · Science & Mathematics · 03/09/2019

8. ### A 20.0 kg object moving in +x direction at 6.5m/s collides head on with 15.5kg object moving in -x direction at 4.0?

...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

9. ### Need some help with solving this Physics exercise ? (Planks constant )?

...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

10. ### In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground...?

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