Questions tagged [homework]

If your question is part of your high school or college/university homework, please use this tag. Do not use this as the only tag on a question. It signifies that instead of a direct answer, care should be taken to explaining the steps to the solution, preferably sticking to just giving helpful, conceptual hints. This tag may be applied to questions which are not homework but are similar to a homework problem.

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10 votes
1 answer
267 views

Simplest formula of a calcium phosphate mineral?

I had a homework question: Given the formula: $$\ce{Ca}_x\ce{(PO4)}_y\ce{OH}$$ Find the lowest possible values of $x,y$ and state (look up) the mineral name. Based on the anion charges ...
2 votes
1 answer
653 views

The apparent path of the sun

An American College Test sample question asks: Based on the shadow directions in these experiments, which of the following best describes the difference between the apparent path of the Sun as seen ...
  • 37
1 vote
0 answers
810 views

How to calculate the infiltration rate? [closed]

This is Exercise 4.8.1 in Introduction to Physical Hydrology by Martin Hendriks. The water level above flat terrain during an experiment with double ring infiltrometer is 20 mm. The saturated ...
7 votes
1 answer
358 views

How to calculate hydrostatic equilibrium?

I'm trying to solve the following problem. The sea level in the past was 200 m higher than today. The seawater became in isostatic equilibrium with the ocean basin. what is the increase in the depth $...
4 votes
1 answer
941 views

How and why humidity and vapour pressure change as a parcel of air with an unchanging amount of water vapor rises, expands, and cools

I know that a parcel of air can rise, cool and create clouds and rain but I'm struggling to understand how: absolute humidity relative humidity actual vapour pressure saturation vapour pressure ...
  • 141
7 votes
3 answers
809 views

Oxygen isotope ratio and Glaciers

The question is basically: During the Cretaceous there were no continental ice sheets. The ratio of O-18/O-16 in sea water was: a) Higher than today b) Lower than today The answer ...
  • 181
4 votes
1 answer
2k views

How can I normalize this chemical analysis to a mineral with 3 cations?

$\ce{FeO}$ = 70 wt% $\ce{TiO2}$ = 30 wt% The molecular weight given of $\ce{FeO}$ = 72, and the mw of $\ce{TiO2}$ = 80. The first step I did was divide each wt% by their molecular weights to get a ...
  • 143
3 votes
1 answer
1k views

How to determine if this fault is normal, sinistral?

Studying for an exam tomorrow and stumped on this question (parts d and e). The region show in Map 2 consists of a series of sedimentary strata that have been tilted and then eroded, producing an ...
3 votes
1 answer
636 views

Help determining virtual geomagnetic pole

Magnetic measurements have been made on some lavas found at 60ºN and 90ºW. The inclination angle is 37º. If the horizontal direction of magnetism of these lavas is due west, calculate the position of ...
  • 39
9 votes
1 answer
2k views

A parcel of air in an isothermal layer

I'm having a bit of trouble figuring out a solution to this problem: There is an isothermal layer of air which has a temperature of 0 °C extending from the surface to 1 km height. A parcel is 0.5 °C ...
24 votes
3 answers
29k views

Why is there a seasonal cycle to the amount of CO2 in the atmosphere?

I'm doing some homework on the increase of $\mathrm{CO}_2$ in the atmosphere. On one of the graphs it shows the amount of $\mathrm{CO}_2$ peaks in May and has a low in November. Why is this? Shouldn't ...
11 votes
1 answer
4k views

Lake inflow-outflow problem

The evaporation from a lake is to be calculated by the water balance method. Inflow to the lake occurs through three small rivers, A, B and C. The outflow occurs through the river D. Calculate ...
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