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I did fractional distillation to separate two solvents in my chem lab last week and I was just wondering if someone could check my thinking. So for the first little while after the distillation began, no solvent collected in the receiving flask because the temperature was still making its way...

Homework Statement In a testcross in D. melanogaster, the female heterozygote shv+/shv ; he+/h+e is crossed to a male from the homozygous recssive stock, shv/shv ; he/he. What proportion of the hairy-bodied flies has short veins? What event during meiosis causes this? How does the...

Okay I think I see, the top wire is parallel to each of the bottom wires, just the force from each has both an x-component and y-component. But the x-components cancel out and so the net magnetic force on the top wire is just straight up, isn't it? And looking again at the equation for the...

Homework Statement The figure (http://img.photobucket.com/albums/v80/northerndancer/thefigure.jpg?t=1173558797 [Broken]) is a cross section through three long wires with linear mass density 50 g/m. They each carry equal currents in the directions shown. The lower two wires are 4.0 cm apart and...

Forgot I posted this! Thanks for your response. :)

Homework Statement Which of the substanced KCN, NaF, KBr, LiCl, and NH4Br will react with water to produce non-neutral solutions? a.) KCN, LiCl and NH4Br b.) KCN, NaF and NH4Br c.) NaF, LiCl and NH4Br d.) NaF, KBr and NH4Br e.) KCN, KBr and LiCl Homework Equations The...

Thanks so much! Now I think I can use the kinematics equation to find the relations between the heights, and do likewise for the kinetic energy question. Cool.

Homework Statement Consider three ball bearings, one with a mass of 8 g, one with a mass of 16 g and one with a mass of 32 g. a.) What heights should the three ball bearings be dropped from so that at impact all three ball bearings will have the same velocity? b.) What heights should the...

Homework Statement 8) Suppose the following DNA sequence was mutated from 5'-AGAGAGAGAGAGAGAGAGA to 5'-AGAAGAGAGATCGAGAGA. What amino acid sequence will be generated based on this mutated DNA? A) glu-arg-glu-leu-leu-leu B) ser-leu-ser-leu-ser-leu C) ser-ser-leu D)...

Homework Statement In the attachment: 5aef, 6abc The Attempt at a Solution 5a.) I started by dividing the question into two integrals: the integral of 2sin(x) evaluated from 0 to pi/4 minus the integral of 4sec2(x) evaluated from 0 to pi/4. Then the anti-derivative of 2sin(x) is -2cos(x)...

Ahh, that makes sense. Thanks!

Homework Statement A uniform ladder with mass m2 and length L rests against a smooth wall. A do-it-yourself enthusiast of mass m1 stands on the ladder a distance d from the bottom (measured along the ladder). The ladder makes an angle x with the ground. There is no friction between the wall...

1.) Thanks, that helps! 2.) The diagram in the attachment had O with two lone pairs double bonded to C double bonded to N with two lone pairs and a formal charge of -1 on N. Thanks for the help.

I'm doing a practice exam that I have answers to, but I'm not sure how to go about getting to the right answer for some. Homework Statement A nitrogen laser produces pulses of light of wavelength 337.1 nm. If each pulse contains 10.0 mJ of energy, how many photons are contained in one...

This problem is really frustrating me. Any help is appreciated! Answer the following questions for the function f(x) = \sin^{2}{\frac{x}{6}} defined on the interval [-6π + 0.8, 6π/4 - 0.3]. A. f(x) is concave down on the region ____ to ____. B. A global minimum for this function occurs...

Oops! I wasn't even thinking of that, my bad... Yeah, I think you're probably right, I'm just worried that the solutions are a bit brief compared to what might be expected on an exam. Maybe I'll just talk to my prof about it. Centripetal acceleration is toward the center of the circle...

I've been doing some practice force questions and there are a few I don't understand. I have the solutions to them, so my questions will be relatively short, but I just need to have some things cleared up. The first one: "A circus performer of weight W is walking along a 'high wire' as shown...

Figured it out, thanks!

I'm having trouble coming up with a strategy for this problem. Any help is appreciated! "You are swinging a bucket (mass 1.00 kg) containing 2.00 kg of water at a constant angular speed in a vertical circular path (the path lies in a vertical plane) of radius 1.00 m. a.) What is the...

Oops! Now I feel stupid. This is non-uniform circular motion... so I need to find the net radial force and the net tangential force than use the Pythagorean Theorem to solve for Fnet. Thanks for pointing that out!

Hi there, I was wondering if anyone could help me with a centripetal motion question. "A cyclist competes in a one-lap race around a flat, circular course of radius r. Starting from rest and speeding up at a constant rate throughout the race, the cyclist covers the entire course in a time Δt...

Whoops! Should post here to let you know I used your hints to figure it out, so thanks!

I'm having some difficulty with a projectiles question. "A projectile is fired with an initial speed of 26.0 m/s at an angle of 40.0 degrees above the horizontal. The object hits the ground 8.00 s later." The first part of the question is: "How much higher or lower is the launch point...

Thanks, I got the answer

That makes sense... so I got to where I balanced equation [1] by writing half reactions and cancelling out electrons to get the balanced equation, say [1.5]. And I balanced [2] to get [2.5]. Now I am asked to combine [1.5] and [2.5], in that order. But I'm not sure how to do that? Can I just...

The attachment shows reactions involved in a titration experiment. In the first equation, iodate reacts with iodide in acidic solution to produce iodine. In the second equation, the iodine is titrated with thiosulfate. I know the volume and molar concentration of iodate as well as the volume...

Nevermind, I figured it out. Just needed to give it a little more thought!

Oops, here is the diagram for the question. http://img.photobucket.com/albums/v80/northerndancer/physics.jpg

Sorry, I should have posted this in my other thread! Here's the information for the question: "A man is running at speed c (much less than the speed of light) to catch a bus already at a stop. At t=0, when he is a distance b from the door to the bus, the bus starts moving with the positive...

Thanks a bunch, got the answer!

Having issues fixing the fraction in my answer, so I'll try again here. Here is what I got: \frac{v_{B}t - D_{A}} {v_{A}} = t

I’m having difficulty with an assignment for my Physics class. Here’s the question: “Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance D_{A} beyond the starting line at t = 0. The starting line is at x = 0...