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1. ### 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

2. ### 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

3. ### A possible way to enhance and open a dormant time portal?

Nice implementation of kozyrev torsion theories. First you need to determine the ambient speed of time propagation and its relation to the time span it traverse. Is it a...

5 Answers · Science & Mathematics · 23/07/2019

4. ### NEED PHYSICS HELP ON THIS SPECIFIC QUESTION...?

(1/2)v^2 = (1/2)(65^2)+9.8(125) solve for v

1 Answers · Science & Mathematics · 31/07/2019

5. ### I need help with this Astronomy equation question?

It takes about 30000 years for a signal to get there and another 30000 years for the reply to get here.

2 Answers · Science & Mathematics · 07/04/2019

6. ### Can someone help me with my physics HW? (Preferably someone who has taken physics courses) Best answer award will be given.?

Boy, I like the trajectory equation for this -- we don't need to solve for the time of flight. y = h + x·tanΘ - g·x² / (2v²·...

2 Answers · Science & Mathematics · 07/05/2019

7. ### PHYSICS HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!??????????

...force (up), and a friction force (to the left). b/ "constant speed" means "equilibrium". So the friction... = 708 N BONUS: You could solve for the coefficient of friction: f = µ*Fn, and you now...

1 Answers · Science & Mathematics · 23/07/2019

8. ### Physics Homework help?

... If you look at the equation for position Between t=7 and t=16...the heck would that be useful So we need to turn that into the standard "t"...end so I guess it will get up to speed of light and then destroy the universe.

2 Answers · Science & Mathematics · 25/02/2019

9. ### pls help me asap?

...release does the mailbag reach the ground?  we need height and speed at t=4 h(4) = 1.1•4³ = 70.4 m v = h'.../2g = 52.8²/2•9.8 = 142.2 m time for that t = v/g = 52.8/9.8 = 5.39 s it reaches...

1 Answers · Science & Mathematics · 18/09/2019

...p/p0)=10 log(0.5*10^6/20)=60 *0.025=1.5 Wave length= 343/349=0.12 m For the pressure equation you need the amplitude value. I have to guess Wave=sqrt(0.)5 sin wt, pressure will...

2 Answers · Science & Mathematics · 22/10/2019