If a cosmic ray proton approaches the Earth from outer

Conceptual Physics 12
Problem 9E If Earth were smaller than it is, but the Alexandria-to-Syene distance were the same, would the shadow of the vertical pillar in Alexandria be longer or shorter at noon during the summer solstice?

Organic Chemistry 8
Problem 3P Write Lewis structures for the following molecular formulas. (a) N 2 (b) HCN (c) HONO (d) CO 2 (e) CH 3 CHNH (f) HCO 2 H (g) C 2 H 3 Cl (h) HNNH (i) C 3 H 6(one double bond) (j) C3H4 (two double bonds) (k) C3H4 (one triple bond)

Classical Mechanics 0
A particle moves in a circle (center O and radius R) with constant angular velocity \(\omega\) counter-clockwise. The circle lies in the xy plane and the particle is on the x axis at time t = 0. Show that the particle's position is given by \(\mathrm{r}(t)=\hat{\mathrm{x}} R

Myers' Psychology for AP 2
Define and give an example of maturation. Define infantile amnesia and explain how maturation contributes to this phenomenon.

Biology 8
The decline of MPF activity at the end of mitosis is due to a. the destruction of the protein kinase Cdk. b. decreased synthesis of cyclin. c. the degradation of cyclin. d. synthesis of DNA. e. an increase in the cell's volume-to-genome ratio.

Krugman's Economics for AP® (High School) 2
Suppose a rise in productivity increases potential output and creates a recessionary gap. Explain how the economy can self-correct in the long run.

Macroeconomics 22nd
Potatoes cost Janice $1 per pound, and she has $5.00 that she could possibly spend on potatoes or other items. If she feels that the first pound of potatoes is worth $1.50, the second pound is worth $1.14, the third pound is worth $1.05, and all subsequent pounds are worth $0.30 per pound, how many p

Principles of Economics 9
Ernie owns a water pump. Because pumping large amounts of water is harder than pumping small amounts, the cost of producing a bottle of water rises as he pumps more. Here is the cost he incurs to produce each bottle of water: Cost of first bottle - $1 Cost of second bottle - $3 Cost of third bottle