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qwerty

Questions and answers by visitors named qwerty

Questions (293)

All ships travel at the same speed through a wide canal. Each ship takes days to traverse the length of the canal. Eastbound
1. 3 answers
2. asked by qwerty
3. 6,474 views
In parts 1, 3, 4, and 5 below, your answers will be algebraic expressions. Enter 'lambda' for and 'mu' for . Follow standard
1. 6 answers
2. asked by qwerty
3. 6,962 views
A fair coin is tossed repeatedly and independently. We want to determine the expected number of tosses until we first observe
1. 4 answers
2. 2,807 views
A roughly spherical asteroid with a diameter of 1 km, and a mean density of 4 g/cm^3, hits the Earth with a relative speed 1.5
1. 8 answers
2. 5,660 views
The current peak wavelength of the CMB corresponds to a blackbody of temperature 2.74K. What was the peak wavelength of the CMB
1. 5 answers
2. 2,645 views
A quasar is observed at a redshift of z=1, which corresponds to a comoving radial distance of 3 Gpc. Its observed bolometric
1. 5 answers
2. asked by qwerty
3. 2,645 views
The star Polaris has a surface temperature of roughly 6500 K and a radius of approximately 50 solar radii. Find the luminosity
1. 4 answers
2. 2,364 views
Amy’s Metaphor has a first person point of view. The story is told by the main character Amy. From Scratch has a third-person
1. 4 answers
2. 496 views
Sometimes a crater from the Noachian period can be found inside of a crater from the Amazonian period.Probably true Maybe
1. 4 answers
2. 596 views
In Drosophila melanogaster, the genes for purple eyes (pr) and curved wings (c) are on the same chromosome. The recombination
1. 4 answers
2. 2,165 views
The graph shows the titration curve for 25.0mL of an aqueous solution of B titrated with 0.100MHCl. Which of the following best
1. 5 answers
2. 3,700 views
An equilibrium mixture contains 0.250 mol of each of the products (carbon dioxide and hydrogen gas) and 0.200 mol of each of the
1. 5 answers
2. 4,133 views
Imagine that a rival astronomer proposes that your mysterious object is actually the mouth of a wormhole to another dimension.
1. 3 answers
2. 821 views
Supernovae can eject material at velocities of 0.001c. Will gas ejected by a supernova which occurs inside a dwarf galaxy with a
1. 3 answers
2. 637 views
Solving the equation C = Ba ^ (t/D) - K for t using logarithms with base a gives you:A. D loga (C/B +K) B. loga (D(C+K)/B) C.
1. 5 answers
2. 1,154 views
The decibel level of a sound is given by the equation D=10log 10 (i/i 0), where "i" is the sound's intensity and "i 0"
1. 4 answers
2. 2,724 views
In this pulley system, the pulleys will _____ the mechanical force required to lift the block and will change the _____.
1. 4 answers
2. 441 views
why were the acient assyrians considered the first true emipre?how did they did they do it?
1. 5 answers
2. 576 views
why is the significance of the mandate of heaven in the shang and zhou dynasty?i googled it and browsed around wiki what i
1. 2 answers
2. 629 views
a question i asked yesterdaywhy was the assyrian empire considered the first? i don't have enough specifics can i have some help
1. 2 answers
2. 690 views
compare and contrast two ancient civilizations.i had the choice between -indus -mesoamerica -egypt -mesopotamia -china haung he
1. 10 answers
2. 2,847 views
ok well... my prompt iswhat is the artist's responsibility to right(correct) societal wrongs? i'm just looking for some ideas to
1. 5 answers
2. 490 views
im includingSonny Bono in the essay im going to write... i googled him and read his wiki page but could you tell me more about
1. 1 answer
2. 417 views
well im troubled with a prompt, it is...explain how the path your life would take be diffrent if school ended at 9th grade...
1. 2 answers
2. 641 views
explain how the path your life would take would be diffrent if school ended after 9th grade...well im just looking for a few
1. 7 answers
2. 607 views
this is christian europe 300-1200i have these two questions left from a long study guide what were some of the changes that the
1. 1 answer
2. 470 views
i know how to write/make explicit formulas but i have tried long and hard to find the formula for the sequence 2,7,15,26,40 i
1. 1 answer
2. 361 views
let the function by y = ax^2 + bx + cand sub in (1,2),(2,7), and (3,15) this gives you 3 equations in 3 unknowns which solve
1. 7 answers
2. 387 views
who invented the card game "crazy eights"??plz and thank you
1. 1 answer
2. 413 views
Which of the following solution has greater density?1. 100ml of saturated aqueous solution of Lif. (Ksp(Lif)=1.84*10^-3). 2.
1. 3 answers
2. 562 views
what is acceleration?
1. 1 answer
2. 214 views
definition of clothing and textiles
1. 3 answers
2. 519 views
what is easingdefinition of easing
1. 1 answer
2. 302 views
What observations were used by Edwin Hubble to show that the universe is expanding?- The distance to a galaxy is proportional to
1. 3 answers
2. 563 views
How do we explore the large-scale structure of the Universe in the modern day?- Using large spectroscopic redshift surveys. - By
1. 3 answers
2. 402 views
Most of the energy in the Universe today is...- contained in the motion of galaxies. - released through supernova explosions. -
1. 1 answer
2. 378 views
Cosmological redshift is defined as R(t0)/R(te) =- 1+z - 1 / 1−z - 1−z - 1 / 1+z
1. 1 answer
2. 386 views
Which of the following phenomena is NOT a consequence of Special Relativity?- Mass-energy curves space-time - Length contraction
1. 1 answer
2. 358 views
The equation describing the geometry and mass-energy distribution of a homogeneous and isotropic universe is known as:- The
1. 3 answers
2. 472 views
The universe is homogeneous and isotropic on:- large scales (more than 100 Mpc) - neither small nor large scales - small scales
1. 1 answer
2. 438 views
The scale factor, R, describes how universal expansion changes with:- time - curvature - location - all of the above
1. 3 answers
2. 333 views
The solution of Olbers' Paradox is:- The universe is opaque at large scales - The universe expands - There is simply not enough
1. 3 answers
2. 504 views
A Megaparsec is:- The distance to the Andromeda galaxy - The distance from which 1 AU subtends an angle of 1 microarcsecond -
1. 3 answers
2. 514 views
Which of these is NOT a good estimate of the age of the universe?* Decay times of 238U and 232Th in metal-poor stars. *
1. 1 answer
2. 368 views
The most cosmological measurements show that the universe is extremely flat (Ωk≈0) and that the surface brightness of objects
1. 1 answer
2. 423 views
The single largest uncertainty in the measurement of the Hubble constant using gravitational lenses comes from uncertainty of...
1. 1 answer
2. 367 views
In the Tully-Fisher relation, the scatter is minimized at which wavelength?* Red * Blue * Infrared * UV
1. 1 answer
2. 294 views
As compared to Cepheids, RR Lyrae stars are...* fainter and slower pulsating. * brighter and faster pulsating. * fainter and
1. 1 answer
2. 289 views
Lookback time for a given redshift, tL(z), is...* time between the given redshift and the beginning of the Universe. * time
1. 1 answer
2. 380 views
In a universe where the scale factor is proportional to t^α, where t is time and α is a constant less than one, the universe
1. 1 answer
2. 462 views
In order from earlier to later times, the dominant components of our universe have been:* dark energy, matter, then radiation *
1. 2 answers
2. 487 views
In an Einstein-de Sitter (matter-dominated) universe, the scale factor is proportional to time to the power of:* 3/2 * 2/3 * 1/2
1. 1 answer
2. 305 views
A curvature constant of k=0, as used in the Friedmann equation, means:* The universe is open * The universe is matter-dominated
1. 1 answer
2. 886 views
We have a qubit in the state |ψ>= √3/2 |0>+ 1/2 |1>, which we want to measure in the {Cos θ |0> + Sin θ |1>, Sin θ |0> -
1. 1 answer
2. 364 views
Suppose that a qubit is in the state |ψ> = a |0> + √ (1-a^2)|1> where a [-1,1] . If we first perform a standard basis
1. 1 answer
2. 426 views
Suppose we have two qubits in the state α|00⟩+β|11⟩.(a) If we measure the fi rst qubit in the sign basis, what is the
1. 1 answer
2. 421 views
Suppose we have a qubit in the state |ψ>. We know that if we measure it in the standard basis, the probability of getting a 0
1. 4 answers
2. 721 views
What is ZX applied to H|0>?
1. 1 answer
2. 844 views
Alice and Bob share a state a|++> + b|-->, where the first qubit is Alice's and the second qubit is Bob's. Alice measures her
1. 5 answers
2. 622 views
The majory of galaxies (by number) are:- barred spirals - giant ellipticals - lenticulars - dwarfs
1. 1 answer
2. 300 views
Which type of emission closely traces the star-forming regions of a galaxy?- molecular CO emission - coronal X-ray emission - 21
1. 1 answer
2. 1,229 views
Suppose H|ψ> = 1/√2 (|000> + |111>). What is |ψ> ? Specify the probability amplitude for each component:|000> = |001> =
1. 1 answer
2. 468 views
Suppose Alice starts with two qubits in the Bell state 1/√2 (|00> + |11>) and teleports these qubits to Bob by applying the
1. 5 answers
2. 450 views
For each of the following, enter the number of covalent bonds that the atom can form:(A) One atom of carbon (B) One atom of
1. 4 answers
2. 2,734 views
Given these pairs of atoms, indicate whether the following bonds are polar or non-polar covalent bonds.C-H N-H O-H C-C
1. 2 answers
2. 646 views
Given the part of the molecule shown below, can the red atom participate in a hydrogen bond with an approriate bonding partner?-
1. 3 answers
2. 530 views
Which of the following bond types is Testosterone capable of forming with a suitable partner molecule? Indicate your answer by
1. 2 answers
2. 590 views
Dopamine is a neurotransmitter—a chemical released by nerve cells to send signals to other nerve cells. Activities like sex
1. 3 answers
2. 1,197 views
Which of the following can be considered evidence of galaxy evolution observed in the Milky Way?- differential rotation of the
1. 1 answer
2. 425 views
At what cosmic time was/is star formation density at its peak?-At present time. -Within the first billion years after the Big
1. 3 answers
2. 554 views
What causes the ionization of the Intergalactic Medium (IGM)?- radiation from star-forming galaxies and quasars - residual
1. 1 answer
2. 469 views
Let |ψ> = a|0>+b|1> where a and b are nonnegative real numbers. We know that if we apply H to this qubit and then measure the
1. 13 answers
2. 611 views
I) Provide a unitary that maps |+> to |1> and |-> to |0> . Enter 0 in all boxes if no such unitary exists.a b c d II)Provide a
1. 18 answers
2. 450 views
Suppose we are given a single qubit which is either in the state |u> = cos(pi/8) |0> + sin(pi/8) |1> or |v> = cos(3pi/8) |0> +
1. 10 answers
2. 952 views
Black holes can be completely described by which three parameters?-angular momentum, spin, and electric charge -angular
1. 1 answer
2. 492 views
Mergers of two supermassive black holes will be major sources for observations of gravitational waves in the future. What do
1. 1 answer
2. 380 views
Which event is likely to trigger rapid growth in supermassive black hole mass?-A merger of two gas-rich galaxies. -Direct
1. 1 answer
2. 791 views
- What is QFT6 of 1/√2(|0> + |3>?- What is QFT6 of 1/√2(|1> + |4>? - What is QFT6 of 1/√3(|0> + |2> + |4>? - What is QFT6
1. 37 answers
2. 738 views
Mendel also studied the trait of flower color. Some plants had white flowers, while others had purple flowers.Consider the
1. 2 answers
2. 598 views
Mendel also studied pod color, which could be green or yellow, as well as seed shape, which could be round or wrinkled.Consider
1. 3 answers
2. 506 views
Consider the following cross involving the genes for pod color and seed shape:P generation: Green pods with round seeds= ____
1. 3 answers
2. 550 views
Let f:{0,1}->{0,1} with f(101)=1 and f(x)=0 for x ≠ 101 . In this question, we will run through two iterations of the
1. 16 answers
2. 603 views
β-thalassemia is a human genetic disease that is inherited in an autosomal recessive manner. Individuals with β-thalassemia
1. 5 answers
2. 846 views
Amylase is secreted by your pancreas into your small intestine where amylase helps you digest the starches in your diet. Amylase
1. 7 answers
2. 1,272 views
Nicotine is a small molecule produced by the tobacco plant Nicotiana tabacum. Nicotine is produced by the plant to discourage
1. 16 answers
2. 792 views
The ground state wavefunction for a particle in a shallow potential well in 1 dimension is of the form: Ae^(−|x|/2d). Given
1. 3 answers
2. 708 views
Suppose we have a particle in 1-dimension, with wavefunction Ae^(−|x|/2d). What is the probability to find the particle in the
1. 1 answer
2. 388 views
Suppose a particle has wavefunction ψ(x,t=0)=Ae^(−x^2/l^2). What is the average value (expectation value) of p, <p>, for this
1. 1 answer
2. 382 views
Consider a particle whose wavefunction at some fixed time t is represented by-A if -2≤x≤0 ψ(x)= A if 0≤x≤3 0 otherwise
1. 33 answers
2. 1,239 views
Suppose we ran m steps of Grover's algorithm on some function f (which has one marked element y) and the resulting superposition
1. 99 answers
2. 1,451 views
Consider the observable M that corresponds to a measurement in the sign basis where the measurement value is 3 if the outcome is
1. 1 answer
2. 482 views
What is the maximum value of the wavelength of light that will ionize the hydrogen atom? Express your answer in units of
1. 3 answers
2. 1,443 views
A particle with the mass of a proton is trapped in a box. The particle falls from the n=3 state to the n=2 state and emits 0.16
1. 1 answer
2. 439 views
What is the size, i.e. the radius, of a black hole with a mass equal to that of Earth (MEarth=6×1024kg)? Give your answer to
1. 1 answer
2. 322 views
Look up where Voyager 1 is now and compute how many lighthours it is away.Round your answer to the nearest number of light
1. 1 answer
2. 327 views
Each time period corresponds with an event in the list below labeled a to e.Starting with the earliest time period (10^−34 s),
1. 3 answers
2. 606 views
Why didn’t the Universe collapse into a black hole in the past when there was somuch matter in such a small space? (a) Most of
1. 4 answers
2. 645 views
Where did CMB radiation originate?(a) It is the radiation from the electroweak phase transition when the weak force was spon-
1. 2 answers
2. 514 views
How do we image dark matter?(a) We see light from galaxies behind the bullet cluster that is bent (gravitationally lensed) due
1. 3 answers
2. 618 views
Now imagine you’re an astronomer on Earth looking at the spectrum of anobject in space. In the spectrum you are looking for
1. 2 answers
2. 530 views

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