sailey

3. As astronauts consider how to better study Excalibur, they reflect on some of the probes they have used in our own solar system. They recall a probe that they released from a spacecraft onto the moon. The probe sends signals to a transmitter on the spacecraft. Assuming that the probe and transmitter are 10m apart and they have no initial charge, what negative charge must be transferred to the probe to create an attractive force between them of 200N? (Show your work) (5 points)

4. Using your knowledge of Newton's Universal Law of Gravitation and Coulomb's Law, compare and contrast them. How are they similar? How are they different? (5 points)

A car travels along a straight road at a constant speed of 20 meters per second. The car's brakes can decelerate it at a rate of 5 meters per second squared. If the car's driver sees an obstacle and applies the brakes, how far will the car travel before coming to a complete stop?

In terms of intermolecular forces, explain why we see this general trend with formula masses

4. Identify R and R' in Equation 1 when ester, aspirin, is made from salicylic acid and acetic acid. 5. Write the equation for the reaction by which aspirin decomposes in an aqueous ethanol solution

25 *25=?

15*15=?

16*16=?

Business Plan

Given the following demand equation P = 420 - .3Qd, calculate the price elasticity of demand at a price of $60. Now suppose the demand curve shifts to the right and becomes P = 500 - .3Qd. Recalculate the elasticity at the $60 price. 

1. (Elasticity) Using the following demand function

                              Q_d (P)=20,000e^(-P)

1. (3 points) Calculate the point price elasticity of demand at P = 4

1. (3 points) Does demand follow the law of demand at this price? EXPLAIN

Using balanced chemical equations, explain the observed conductivity at the point of faint pink indicator color for:

1) The addition of ammonia to acetic acid.

2) The addition of barium hydroxide to sulfuric acid

1.What is physics?

The aqueous solution of aluminium-permanganete can be made with the combination ofaluminium-sulphate and potassium-permanganate solutions. We can get a pure aluminium-permanganete solution by the fact that potassium-aluminium-sulphate is practically insoluable in water at 0°C.

In what ratio should we combine the two saturated solutions at 80°C to get a pure solution of aluminium-permanganate?

Soluability at 80°C: 

Potassium permanganate: 33.7g/100g water

potassium-aluminium sulphate: 73.1g/100g water

Think about Starbucks. Which change do you think is most important?

◯ Putting coffee in hotel rooms

◯ Opening new stores in airports

◯ Adding new services to stores

Explain why you voted the way you did.

Who is William sheakspear

Light bulb

writing research an invention and who invented

What is the invention describe the invention for ?

When was it invented ?

How was the inventor’s life?

Who was his/her job ?

What education does she / he have ?

Where did he / she live ? In which city ?/ country ?

When did he/she live ?

How do you use this invention? For what reason?

How does this invention improve your life ?

How did this invention change your life?

What would you do without this invention?

Jain and Marshall studied wild oat population genetics in California. One of the traits they examined was the pubescence (hairiness) of the leaf sheath, in which is controlled by a single locus with two alleles; L and I. they found that the frequencies of genotype in one population were:

LL 57.1%

LI 7.1%

II 35.8%

Calculate the allele frequency

Predict what the genotype frequencies should be under hardy-Weinberg equilibrium (HWE)

1) Avena fatua is a species of wild oat (a type of grass). Jain and Marshall studied wild oat population genetics in California. One of the traits they examined was the pubescence (hairiness) of the leaf sheath, which is controlled by a single locus with two alleles, written L and l. They found that the frequencies of genotypes in one population were [LL 57.1% Ll 7.1% ll 35.8%]. Calculate value of the inbreeding coefficient, F.

2) Suppose you put 500 northern Fundulus fish (all genotype AA) and 500 southern fish (all genotype BB) in a large tank, allowed them to breed freely, and then raise the offspring into the next generation. The relative fitnesses of possible genotypes in this system are w_AA = 0.25, w_AB = 1, and w_BB = 0.67. What will be the genotype frequencies after one generation of random mating? What will be the genotype frequencies after the second generation of random mating?

The B locus has two alleles B and b with frequencies of 0.8 and 0.2, respectively, in a population in the current generation. The genotypic fitnesses at this locus are w_BB= 1.0, w_Bb = 1.0 and w_bb = 0.0.

a.) What will the frequency of the b allele be in the next generation?

b.) What will the frequency of the b allele be in two generations?

c.) What will the frequency of the b allele be in two generations if the fitnesses are: w_BB= 1.0, w_Bb = 0.0 and w_bb = 0.0.

d.) Why is the difference between answers in parts b.) and c.) so large?

m=-2. find the det((2a^3)*(b)), where det(b)=1/2.

the picture shows a plank, which is 5 m in length, supported on two trestles. The mass of the plank is 37 kg and the mass of the Electrician is 70 kg. In order to change a lightbulb on a stairwell the electrician has to position themselves at point A, as shown on the picture. To stop the plank tipping, the electriciant attaches weights to a rope at point B.

• a.Draw a diagram showing all the forces acting on the plank and the distances from point B that each force acts.  
  
• b.State, in words, two conditions that must be satisfied for the plank to be stationary and stable.  
  
• c.For each of the two conditions you have identified in part (b), using the information contained in your diagram, write an equation that must be satisfied for the bar to remain stationary. Do not include units in your equations.  
  
• d.What is the minimum weight (in newtons) that the electricain must attach to the rope to prevent the plank from tipping? (Hint: think about the reaction forces at the trestle nearest the rope at the point when the plank just begins to tip.) Give your answer to 2 significant figures.  
  
• e.If the rope has a diameter of 22 mm, calculate the stress in the rope when applying the force you calculated in part (d). Give your answer to 2 significant figures.  
  

In the Carbon 13 NMR of benzil, which carbon is responsible for the resonance at 194.5 ppm? The other peaks are at 134.8, 132.9, 129.8, and 128.9 ppm. Which carbon(s) are responsible for the resonances at 134.8 and 132.9 ppm? You do not need to assign each resonance, but identify which carbon(s) might give rise to these signals.

Which carbon in methyl salicylate is responsible for the resonance at 170.6 ppm? Which is responsible for the resonance at 52.2 ppm?

 Which gas is responsible for the swelling of bread?   

You have prepared a saturated solution of X at 20 degrees celsius using 41.0 grams of water. How much more solute can be dissolved if the temperature is increased to 30 degrees celsius?

How many grams of water will be needed to saturate 25 grams of KBr at 65 Celsius?

90

27.7

2500

74

How many grams of KNO3 will dissolve in 50 grams of water at 70 Celsius?

160g

62.5g

45g

80g

You make a saturated solution of KCI at 10 Celsius. How many more grams of KCI could be dissolved if the temperature were raised to 100 Celsius?

28

30

58

13

Can someone help me Balance the following and remember thatcharge and mass balance exist, water can be
vapor or liquid, and redox stoichiometry may include fractions:

volcanic pyrite roasting:pyrite (s) + O2 (g) =====> SO2 (g) + hematite(s)

Sweet stoichiometry

I need the full answer. Basically how did I get this answer. Show work

3 cups dough + 1 cup chocolate chips 15 cookies 

4.Phospholipids are particularly important in these structures:a)Membranes.b)Lipoproteins.c)The brain and nervous system.d)Membranes, the brain and the nervous system.e)All of these are correct.5.Glycolipids are particularly important in these structures:a)Membranes.b)Lipoproteins.c)The brain and nervous system.d)Membranes, the brain and the nervous system.e)All of these are correct.6.Sphincters are particularly important in these structures:a)Membranesb)Lipoproteinsc)The brain and nervous system.d)Membranes, the brain and the nervous system.e)All of these are correct.

What does echinoderm mean?

Do echinoderms have a brain? A nervous system?

How do echinoderms move ?

Which echinoderm is globular in shape?

How much energy does it take to convert 500ml of liquid water at 60 degrees C to water vapor at 110 degrees C (the density of water is 1.0 x 10^3 kg/m^3)?

Why is density of liquid water is greater than that ice 

How to behave in best way to other person?