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Science Physics

10/20/21

A spring scale… PLEASE HELP! :)

A spring scale is used to measure the weight of various objects. when a 100g empty glass bottle is placed on the scale, the spring stretches down 1.8cm. How much water should be poured into the... more

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Science Physics Physics

10/20/21

HOW CAN I SOLVE THIS? HELP

The height of the table is 4 m. by repeated measurements the range of values vary because it is not stretched straight, which causes the heights in the first three trials to be 3.35m, 4.20m, and... more

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Science Mechanical Engineering Thermodynamics

10/20/21

Thermo Question Steady-Flow System

An air-conditioning system involves the mixing of cold air and warm outdoor air before the mixture is routed to the conditioned room in steady operation. Cold air enters the mixing chamber at 7°C... more

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Science Chemistry Chem Ap Chem

10/19/21

ap chem question

For each of the following write the blanched, net ionic reaction.a) Solid zinc hydroxide is sprinkled into a solution of iron (III) acetateb) A solution of cesium chloride has bromine liquid... more

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Science Biology Anatomy Physiology

10/19/21

Please help me with this question

Mr. Jim had R total hip replacement 1 day ago. He's having trouble coughing up secretions after her surgery, complaining of SOB & a sensation of "tightness" in his chest, pale & sweating.... more

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Science Biology Genetics Act Science

10/18/21

A positive correlation between genetic differentiation and geographic distance (isolation by distance) is expected from what type of model?

I think it is B, I tried googling it, but I am very confused. A) Wright-Fisher Model with MigrationB) Continent-Island Model of Migration C) Stepping-Stone Models D) Isolation-with-Migration Models

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Science Biology Genetics

10/18/21

If migration rates are high, then ____________________________________.

I think the answer is C, but I am not sure. I think dependent because migration and mutations allele frequency will be affected in multiple populations. A) different alleles will become fixed in... more

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Science Biology Genetics

10/18/21

What does it mean if something is stochastic?

I think the answer is C because if you have a bunch of data you can find the avg. and potentially predict what may happen next. So maybe you can predict the probability of a mutation in a... more

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Science Biology Genetics

10/18/21

Which of the following statements is true about the equilibrium frequency?

Hi, I think the answer is C because when the mutations even out, they ,maybe will become fixed. I'm not sure though because I know hardy Weinberg equilibrium occurs when there are no mutations.... more

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Science Biology Genetics

10/18/21

If a mutation is irreversible, then the original allele will eventually go extinct in the population. (True or False)

I said it was false because I think the original allele can be recessive and also I think it means that mutation will become fixed.

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Science Biology Anatomy Physiology

10/18/21

Please help me with this question

Mr. Jim had R total hip replacement 1 day ago. He's having trouble coughing up secretions after her surgery, complaining of SOB & a sensation of "tightness" in his chest, pale & sweating.... more

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Science Biology Genetics Population

10/18/21

When are Alleles identical by descent?

A) they are molecularly indistinguishable. B) they are functionally equivalent. C) they are derived from the same ancestral copy. I believe it's the last one, but I am not sure.

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Science Biology Genetics Natural Selection

10/18/21

Which of the following forces always adds genetic diversity?

A) MutationB) Genetic driftC) MigrationD) Selection(i think the answer is mutation, but I'm not sure)

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Science Biology

10/17/21

Two populations of birds with somewhat different coloration live on opposite sides of a peninsula....

Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds. When birds from the two... more

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Science Geology

10/17/21

Biogeochemical Cycles

Why is cycling ______important? (Choose one: carbon, water, nitrogen). Be specific and use appropriate terminology specific to your chosen cycle.

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Science Biology

10/16/21

Atmospheric questions

How does fossil fuel usage affect atmospheric CO2?Question - How does plant biomass (amount of plants) affect atmospheric CO2? Prompt Your Response Claim Statement that answers the question... more

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Science Chemistry

10/13/21

Which of the following statements is true?

A. Activation energy is the energy necessary to start a chemical reaction.B. The gaseous state has the highest amount of entropy associated with it.C. Enthalpy of formation is the change in... more

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Science Chemistry

10/13/21

Which of the following has a △Hf of zero?

_______ has a ΔHf of zero.A. Br-B. Na+C. H2OD. CO2E. O2For this I got E. O2 Would this happen to be correct?

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Science Chemistry

10/13/21

Are my answers to these Chemistry problems correct?

In the equation ΔHo = Σ ΔHfo (products) – Σ ΔHfo (reactants), ΔHo stands for _______.A. standard change of enthalpyB. standard change of entropyC. change in heatD. change in hydrogen bondsE. None... more

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Science Chemistry

10/13/21

potassium nitrate reacts with copper (I) sulfite, how do you predict the product?

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Science Chemistry Physics

10/11/21

Write down one possible random and systematic error that may occur.

Calculating acceleration due to gravity using a simple pendulum Finding density of an irregular shaped object Using a ball in a table to compare free fall and projectile motion

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