Questions and answers by

qwerty

Questions (293)

Identify the major macronutrient by weight in each of the following key ingredients.Olive oil Carbohydrates Fats Proteins
1. 1 answer
2. 599 views
Which nutrient is most abundant (by weight) in eggplants?Carbohydrates Fats Proteins Add up the total mass of carbohydrates,
1. 3 answers
2. 1,021 views
Basically the ``Bohr radius'' for the dark matter isrB=ℏ^2 / GN M m^2 where m is the dark matter mass, M is the total amount
1. 0 answers
2. 512 views
How the asymmetry between matterand anti-matter in our Universe might be generated. Why might neutrinos be a key player in
1. 2 answers
2. 662 views
What percentage of the energy budget do electrons occupy? Take the energy budget occupied by matter to be 4.4%.(a) 3.9% (b) 0.1%
1. 3 answers
2. 444 views
The Universe is filled with a frozen in Higgs condensate. If this were to suddenly disappear/evaporate, what would happen?(a)
1. 1 answer
2. 528 views
What were the relative energy densities in the early Universe? (below, DE means dark energy)(a) They remain roughly equal: �rad
1. 0 answers
2. 420 views
Which of the below statements about the CMB are true?(i) The “hot” and “cold” spots are areas where photons have
1. 0 answers
2. 538 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. 0 answers
2. 641 views
How do we image dark matter?(a) We see light from galaxies behind the bullet cluster that is bent (gravitationally lensed) due
1. 1 answer
2. 714 views
Where did CMB radiation originate?(a) It is the radiation from the electroweak phase transition when the weak force was spon-
1. 0 answers
2. 585 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. 3 answers
2. 785 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. 2 answers
2. 710 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. 0 answers
2. 392 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. 485 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. 543 views
What is the maximum value of the wavelength of light that will ionize the hydrogen atom? Express your answer in units of
1. 1 answer
2. 1,530 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. 616 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. 1,760 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. 1,418 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. 0 answers
2. 484 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. 486 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. 0 answers
2. 841 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. 944 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. 1,422 views
β-thalassemia is a human genetic disease that is inherited in an autosomal recessive manner. Individuals with β-thalassemia
1. 4 answers
2. 966 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. 752 views
Consider the following cross involving the genes for pod color and seed shape:P generation: Green pods with round seeds= ____
1. 2 answers
2. 632 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. 2 answers
2. 593 views
Mendel also studied the trait of flower color. Some plants had white flowers, while others had purple flowers.Consider the
1. 0 answers
2. 696 views
In Drosophila melanogaster, the genes for purple eyes (pr) and curved wings (c) are on the same chromosome. The recombination
1. 2 answers
2. 2,358 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. 924 views
Which event is likely to trigger rapid growth in supermassive black hole mass?-A merger of two gas-rich galaxies. -Direct
1. 0 answers
2. 876 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. 482 views
Black holes can be completely described by which three parameters?-angular momentum, spin, and electric charge -angular
1. 1 answer
2. 599 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. 9 answers
2. 1,076 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. 587 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. 737 views
What causes the ionization of the Intergalactic Medium (IGM)?- radiation from star-forming galaxies and quasars - residual
1. 0 answers
2. 538 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. 2 answers
2. 635 views
Which of the following can be considered evidence of galaxy evolution observed in the Milky Way?- differential rotation of the
1. 0 answers
2. 495 views
Dopamine is a neurotransmitter—a chemical released by nerve cells to send signals to other nerve cells. Activities like sex
1. 2 answers
2. 1,362 views
Which of the following bond types is Testosterone capable of forming with a suitable partner molecule? Indicate your answer by
1. 1 answer
2. 684 views
Given the part of the molecule shown below, can the red atom participate in a hydrogen bond with an approriate bonding partner?-
1. 2 answers
2. 612 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. 1 answer
2. 723 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. 3 answers
2. 2,913 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. 3 answers
2. 4,301 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. 4 answers
2. 585 views
Suppose H|ψ> = 1/√2 (|000> + |111>). What is |ψ> ? Specify the probability amplitude for each component:|000> = |001> =
1. 0 answers
2. 587 views
Which type of emission closely traces the star-forming regions of a galaxy?- molecular CO emission - coronal X-ray emission - 21
1. 0 answers
2. 1,339 views
The majory of galaxies (by number) are:- barred spirals - giant ellipticals - lenticulars - dwarfs
1. 1 answer
2. 368 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. 4 answers
2. 772 views
What is ZX applied to H|0>?
1. 0 answers
2. 929 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. 2 answers
2. 822 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. 534 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. 520 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. 0 answers
2. 441 views
A curvature constant of k=0, as used in the Friedmann equation, means:* The universe is open * The universe is matter-dominated
1. 0 answers
2. 990 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. 0 answers
2. 390 views
In order from earlier to later times, the dominant components of our universe have been:* dark energy, matter, then radiation *
1. 1 answer
2. 569 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. 0 answers
2. 553 views
Lookback time for a given redshift, tL(z), is...* time between the given redshift and the beginning of the Universe. * time
1. 0 answers
2. 481 views
As compared to Cepheids, RR Lyrae stars are...* fainter and slower pulsating. * brighter and faster pulsating. * fainter and
1. 0 answers
2. 351 views
In the Tully-Fisher relation, the scatter is minimized at which wavelength?* Red * Blue * Infrared * UV
1. 0 answers
2. 345 views
The single largest uncertainty in the measurement of the Hubble constant using gravitational lenses comes from uncertainty of...
1. 1 answer
2. 456 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. 512 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. 0 answers
2. 436 views
A Megaparsec is:- The distance to the Andromeda galaxy - The distance from which 1 AU subtends an angle of 1 microarcsecond -
1. 2 answers
2. 662 views
The solution of Olbers' Paradox is:- The universe is opaque at large scales - The universe expands - There is simply not enough
1. 2 answers
2. 609 views
Cosmological redshift is defined as R(t0)/R(te) =- 1+z - 1 / 1−z - 1−z - 1 / 1+z
1. 1 answer
2. 447 views
The scale factor, R, describes how universal expansion changes with:- time - curvature - location - all of the above
1. 2 answers
2. 404 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. 530 views
The equation describing the geometry and mass-energy distribution of a homogeneous and isotropic universe is known as:- The
1. 2 answers
2. 636 views
Which of the following phenomena is NOT a consequence of Special Relativity?- Mass-energy curves space-time - Length contraction
1. 1 answer
2. 441 views
Most of the energy in the Universe today is...- contained in the motion of galaxies. - released through supernova explosions. -
1. 1 answer
2. 469 views
How do we explore the large-scale structure of the Universe in the modern day?- Using large spectroscopic redshift surveys. - By
1. 2 answers
2. 487 views
What observations were used by Edwin Hubble to show that the universe is expanding?- The distance to a galaxy is proportional to
1. 2 answers
2. 650 views
what is easingdefinition of easing
1. 1 answer
2. 377 views
definition of clothing and textiles
1. 2 answers
2. 594 views
what is acceleration?
1. 1 answer
2. 271 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. 2 answers
2. 678 views
who invented the card game "crazy eights"??plz and thank you
1. 1 answer
2. 491 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. 6 answers
2. 499 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. 467 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. 0 answers
2. 573 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. 715 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. 1 answer
2. 727 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. 509 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. 4 answers
2. 589 views
compare and contrast two ancient civilizations.i had the choice between -indus -mesoamerica -egypt -mesopotamia -china haung he
1. 9 answers
2. 3,024 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. 1 answer
2. 813 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. 1 answer
2. 729 views
why were the acient assyrians considered the first true emipre?how did they did they do it?
1. 4 answers
2. 689 views