A person of mass LaTeX: 80\:kg\:80 k gis lying on the second floor of a building which is LaTeX: 20 \space m20 m above the ground. With how much force is the person pulling the Earth toward her? Following information may be helpful to you: LaTeX: g\:=\:9.8\:m/s^{2}g = 9.8 m / s 2 Gravitational constant, LaTeX: G = 6.67 \times 10^{-11} Nm^2/kg^2G = 6.67 × 10 − 11 N m 2 / k g 2 The Earth has a mass of approximately LaTeX: 6.0\:\times10^{24}\:kg6.0 × 10 24 k g. Approximate distance between Earth and the person is LaTeX: 6400\:km6400 k m. Please choose the best approximation from below.

Two horizontal plates with infinite length and width are separated by a distance h in the z direction. the bottom plate is moving at a velocity u. the incompressible fluid trapped between the plates is moving in the positive x-direction with the bottom plate. align gravity with positive z. assume that the flow is fully-developed and laminar. if the systems operates at steady state and the pressure gradient in x-direction can be ignored, do the following: 1. sketch your system 2. identify the coordinate system to be used. 3. show your coordinates and origin point on the sketch. list all your assumptions. 5. apply the continuity equation to your system. nts of navier stokes equations of choice to your system 7. solve the resulting differential equation to obtain the velocity profile within the system make sure to list your boundary conditions. check units of velocity 8. describe the velocity profile you obtain using engineering terminology. sketch that on the same sketch you provided in (1). 9. obtain the equation that describes the volumetric flow rate in the system. check the units.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

Which situation will have the highest resistance? a.long wire and high temperatureb.short wire and high temperaturec.long wire and cold temperaturedshort wire and low temperature