Physics
F=k•q₁•q₂/r² k =8.98755•10⁹ N•m²/C²
Physics
Point A: h₁= 22 m, v₁=16 m/s; Point B: h₂= 32 m, r₂= 10 m, v₂=?; Δh₁₂ = h₂-h₁=32-22 = 10 m; Point C: h₃=0, r₃= 20 m, v₃=?; Δh₂₃ = h₂-h₃ = 32 – 0 = 32 m. KE₁+PE...
Physics
Number of atoms is N= N(A)•m/μ = =6.022•10²³•0.003/63.5•10⁻³=2.85•10²². Number of nucleons (protons+neutrons) = =2.85•10²²•63=1.8•10²⁴. Energy = 1.8•10²⁴•550&#...
Physics Need help please
The decay constant is λ=ln2/T = 0.693/5730 = 1.209•10⁻⁴ yr⁻¹. The fraction of ¹⁴C << ¹²C, => we use the atomic weight of ¹²C to find the number of carbon atoms in 270 g: N= (270/12)•6.022•10...
physics
R=ρL/A A=πd²/4
physics
ρgh=σ/r r = σ/ ρgh=0.0072/1000•9.8•0.2 = = 3.7•10⁻⁵ m= 37μm
Physics
η=W/Q =(T₁-T₂)/T₁=1-(T₂/T₁), T₂=T₁(1 – W/Q)= 301(1- 216/2360)=280.7 K
Physics
V=V₀sinωt, ω= ω₀=1/sqrt(LC)=1/sqrt(0.015•5•10⁻⁶)= =3652 rad/s. V(t)=40sin3652t. q=CU, q(t) =CV₀sinωt, q(t) =5•10⁻⁶•40sin3652t=2•10⁻⁴sin3652t, I(t) =dq/dt =d(CV₀sinωt)/...
physics
h=(u²- v²)/2g v²=u²- 2gh, KE=m•v²/2= m(u²- 2gh)/2, KE=PE => m(u²- 2gh)/2 =mgh, (u²- 2gh)/2= gh, u²=4gh, h= u²/4g.
SCIENCE
http://en.wikipedia.org/wiki/Atmospheric_pressure
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