Recent content by aforce20

Someone please help me through this ?

I just don't know where to start in solving the problem :frown:

Here is the example from the book that we are supposed to go off of ---------------------------------------------------------------------- The total energy absorbed for a solar constant, or available power per unit area at Earth's orbit, of 1.35 kW/m2 is, assuming an albedo (reflectivity) of 30%...

Homework Statement 1. If the Sun’s power is reduced by 10%, what would the temperature of the Earth be? Assume an albedo of 0.3 and do not consider greenhouse effects. Homework Equations There is an equation here in the book but it makes no sense to me The Attempt at a Solution...

Thanks to all that helped me with these two problems. Your help is very much appreciated!

The only reason I rounded to 10 , was because the example in the book did the same thing so I figured it was ok to do so, but now that you say something I think I should just keep it as 9.82 So for #1 power= energy/time =700kcal / 30 minutes =23.33 ^ This is the answer, the average...

ok here's my revised #2 I still can't figure out # 1

This is what I have for #2, the speed of the roller coaster with Earth's gravity. Does this look right? And how would i find 1/6 of Earth's gravity? and #1 I came up with this, don't know if it is correct or not.

Homework Statement I really need help on these two problems, I am not sure where to start and for that reason I do not have an attempt at the problem. I am not asking for anyone to do them for me , but could somone give me the equations or the steps needed to solve? 1. I expend 700 Calories...