Recent content by Hangst

Hello? (hello) Is there anybody in here?

Two pictures of an attempt at a solution (no units)> and

Homework Statement Decide the density parameter from the following data: z=0.04, m= 17.38 and σ=0.19 Homework Equations Definition of the density parameter: Where p0 is the current density and pc is the critical density. The Attempt at a Solution I feel like I don't...

Doesn't matter anymore, figured it out. You can lock this now.

Here is my thinking so far: isolate the scale factor so that you have: and then find values for the two unknowns somehow.

Homework Statement Show that by using the Friedmann-equation you can determine the scale factor for a Universe in it's early stages (starting with the Big Bang) to: Homework Equations The equation for the scale factor: Where r(t) is the distance from us to a given galaxy to the time t...

It is supposed to be e^2n not e^2 n

Homework Statement A little ball bounces straight on a surface in a certain way so that at every bounce it loses a fraction of it's vertical speed (called e in this equation). Assume that the ball is released from a ''resting height' (called H in this equation). Show that after the n'th...

Perhaps you could show me what to do, and maybe I will understand it then?

How far the blood travels or? And I'm not sure how I'm supposed to use this.

Not sure what you mean by displacement. Lost in translation I guess :l

Homework Statement When a human heart during a heartbeat pulls together the overpressure in the outwardgoing arteries is about 16 kPa. Every minute the heart drives 5 liters of blood around in the bloodstream. Calculate the average amount of power that the heart delivers Homework...