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Questions (293)

Which is the origin of the sun's energya. nuclear fusion b. burning hydrogen c. solar flairs. c. charged particles
1. 1 answer
2. 133 views
What inference can you make, based on the information in this paragraph?Professor Lucy Dobbs of the School of Industrial and
1. 1 answer
2. 147 views
cotx = -3/5,-pi/2<x<0Use identities to find the exact value for the remaining five trigonometric functions
1. 3 answers
2. 159 views
cosx=-root2/3 and x is in quadrant 3Use identities to find the exact values at x for the remaining five trigonometric functions
1. 1 answer
2. 212 views
Cats and dogs are typically differentiated in terms of their physical attributes, temperament, and behavior. Physically, cats
1. 1 answer
2. 139 views
Explain how to write a function rule from the table below. Then write a function rule.x: 0, 2, 4, 6 y: 2, 1, 0, -1
1. 1 answer
2. 123 views
is brainy a good website
1. 9 answers
2. 95 views
show me a picture
1. 1 answer
2. 86 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. 1 answer
2. 610 views
Amy’s Metaphor, by Elisa Oh, is about a girl that completes an assignment about a metaphor about herself. She tells her
1. 1 answer
2. 395 views
Amy’s Metaphor, by Elisa Oh, is about a girl that completes an assignment about a metaphor about herself. She tells her
1. 1 answer
2. 538 views
Which is the most likely patron for a community mural that will celebrate a city-wide day of reading?
1. 1 answer
2. 226 views
Fill in the blanksPacing is how _____ or _____ the action in the story takes place. This is an important and serious topic.
1. 1 answer
2. 235 views
Fill in the blanksPacing is how _____ or _____ the action in the story takes place. This is an important and serious topic.
1. 1 answer
2. 187 views
Explain how pacing can impact the tone of a narrative piece of writing. Write 1-2 sentences.(2 points)
1. 1 answer
2. 107 views
Which two forms of writing have the similar purpose of entertaining an audience? Select the two correct answers.(1 point)A.
1. 1 answer
2. 165 views
Which two forms of writing have the similar purpose of entertaining an audience? Select the two correct answers.(1 point)
1. 1 answer
2. 314 views
Which word in the sentence appeals to the sense of touch?The sticky juice of the apple remained on her hands in blotchy patches
1. 1 answer
2. 162 views
Determine which word in the following passage was chosen to convey a connotative meaning. Then, explain what this word means.Gag
1. 1 answer
2. 245 views
Determine which word in the following passage was chosen to convey a connotative meaning. Then, explain what this word means.
1. 1 answer
2. 122 views
The following sentences use different words to convey a similar meaning. Assess which sentence uses precise language.Elliot
1. 1 answer
2. 364 views
The following sentences use different words to convey a similar meaning. Assess which sentence uses precise language.
1. 1 answer
2. 166 views
Gage felt a hollow place within his heart. He missed his best friend, Lola, and hoped that she would come back to the town in
1. 1 answer
2. 236 views
In this pulley system, the pulleys will _____ the mechanical force required to lift the block and will change the _____.
1. 2 answers
2. 557 views
Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.Find the function rule.
1. 1 answer
2. 114 views
Which situation describes a non-contact force changing the speed of an object?
1. 1 answer
2. 437 views
A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?
1. 2 answers
2. 485 views
read the following quote from Shirly Jackson's "The Lottery": "The black box grew shabbier each year; by now it was no longer
1. 0 answers
2. 430 views
Choose the word or phrase that best matches the word in italics.Jason was looking forward to a 𝘵𝘢𝘯𝘨𝘪𝘣𝘭𝘦
1. 3 answers
2. 1,181 views
A 50mL of 0.50M hydrofluoric acid (Ka = 7.2 x 10^-4) is titrated with a 0.20Msodium hydroxide solution. What is the pH of the
1. 2 answers
2. 430 views
N2 + 3H2 ⇌ 2NH3, equilibrium constant = 6.0 x 10^-2find the reaction quotient and the direction in which the system will shift
1. 1 answer
2. 518 views
A 50mL of 0.50M hydrofluoric acid (Ka = 7.2 x 10^-4) is titrated with a 0.20Msodium hydroxide solution. What is the pH of the
1. 4 answers
2. 415 views
State the nature of the roots of any quintic function.
1. 1 answer
2. 190 views
find the present value of 5,000 due in eight years if money is worth 12% compounded semi-annually compute also the compound
1. 0 answers
2. 446 views
what kind of speed do you have if your cruise control is set in your car?a. constant b. average c. instantaneous d. velocity
1. 1 answer
2. 216 views
Consider the function f(x)=x^n e^(-2x) for x >/= 0, n > 2A. Find the constant n for which the function f(x) attains its maximum
1. 1 answer
2. 1,309 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. 1 answer
2. 2,927 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. 2 answers
2. 3,810 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. 3 answers
2. 1,272 views
A 100 mL sample of 0.40 M hydrofluoric acid is mixed with 100.0 mL of 0.2M lithium hydroxide. Find the pH of the final solution.
1. 3 answers
2. 1,173 views
150 mL of 2.50 M NaOH is added to a 200 mL solution of 1.80 M HF.1. Write the net ionic equation 2. Determine the pH of the
1. 1 answer
2. 719 views
which of the following was NOT a characteristic of native american societies during the mississippian period
1. 6 answers
2. 2,483 views
the two-party system that we know today developed from which political struggleA: interpretive powers of the supreme court B:
1. 8 answers
2. 4,095 views
The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm
1. 1 answer
2. 2,747 views
If the KCLO3 were not completely decomposed, would your calculated values for percent oxygen in KCLO3 be too high, too low or
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2. 656 views
I want to become an astonomer or study astrophysics but I didnt do maths a level can I still do it? Is there any way you can
1. 1 answer
2. 398 views
How could the development of a smart grid help protect the environment?a. a smart grid uses only renewable energy sources b. a
1. 6 answers
2. 1,634 views
A hollow cylinder with outer radius r0 and inner radius ri is loaded by a uniformly distributed load q across its length L. The
1. 0 answers
2. 798 views
Calculate the ratio of the moments of inertia I1/I2 of two beams of rectangular cross section of the same width, one with a
1. 1 answer
2. 733 views
Calculate the ratio of the moments of inertia I1/I2 of two beams of rectangular cross section of the same width, one with a
1. 1 answer
2. 749 views
Consider a Markov chain X0,X1,X2,… described by the transition probability graph shown below. The chain starts at state 1;
1. 1 answer
2. 1,033 views
A dedicated professor has been holding infinitely long office hours. Undergraduate students arrive according to a Poisson
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2. 630 views
Let θ be an unknown constant. Let W1,…,Wn be independent exponential random variables each with parameter 1. Let Xi=θ+Wi.Wha
1. 1 answer
2. 711 views
Uncle Henry has been having trouble keeping his weight constant. In fact, during each week, his weight changes from the
1. 1 answer
2. 734 views
Suppose that you move to a new house and you are 10% sure that your new house's phone number is 561290. To verify this, you use
1. 0 answers
2. 619 views
Let X and Y be independent random variables, each uniformly distributed on the interval [0,2].Find the mean and variance of XY.
1. 1 answer
2. 1,167 views
A fair coin is tossed repeatedly and independently. We want to determine the expected number of tosses until we first observe
1. 1 answer
2. 2,981 views
Let Θ be an unknown random variable that we wish to estimate. It has a prior distribution with mean 1 and variance 2. Let W be
1. 2 answers
2. 1,197 views
Consider a fire alarm that senses the environment constantly to figure out if there is smoke in the air and hence to conclude
1. 0 answers
2. 675 views
Manhole explosions (usually caused by gas leaks and sparks) are on the rise in your city. On any given day, the manhole cover
1. 0 answers
2. 603 views
Let N,X1,Y1,X2,Y2,… be independent random variables. The random variable N takes positive integer values and has mean a and
1. 0 answers
2. 834 views
Let X be a random variable that takes non-zero values in [1,∞), with a PDF of the formfX(x)=⎧⎩⎨cx3,0,if x≥1,otherwise.
1. 0 answers
2. 751 views
Let U, V, and W be independent standard normal random variables (that is, independent normal random variables, each with mean 0
1. 0 answers
2. 1,122 views
Consider three random variables X, Y, and Z, associated with the same experiment. The random variable X is geometric with
1. 2 answers
2. 1,020 views
We are told that events A and B are conditionally independent, given a third event C, and that P(B∣C)>0. For each one of the
1. 1 answer
2. 892 views
Consider three random variables X, Y, and Z, associated with the same experiment. The random variable X is geometric with
1. 5 answers
2. 1,233 views
Let A,B,C be three events and let X=IA, Y=IB, Z=IC be the associated indicator random variables. We already know that X⋅Y is
1. 5 answers
2. 2,286 views
A fair, 6-sided die is rolled 6 times independently. Assume that the results of the different rolls are independent. Let
1. 7 answers
2. 1,150 views
A binary communication system is used to send one of two messages:(i) message A is sent with probability 2/3, and consists of an
1. 2 answers
2. 639 views
Consider a sequence of independent tosses of a biased coin at times k=0,1,2,…,n. On each toss, the probability of Heads is p,
1. 1 answer
2. 2,316 views
Each one of n persons, indexed by 1,2,…,n, has a clean hat and throws it into a box. The persons then pick hats from the box,
1. 1 answer
2. 5,428 views
The newest invention of the 6.041x staff is a three-sided die. On any roll of this die, the result is 1 with probability 1/2, 2
1. 3 answers
2. 8,028 views
Consider the communication network shown in the figure below and suppose that each link can fail with probability p. Assume that
1. 2 answers
2. 5,156 views
Before leaving for work, Victor checks the weather report in order to decide whether to carry an umbrella. On any given day,
1. 3 answers
2. 6,580 views
Oscar has lost his dog in either forest A (with probability 0.4) or in forest B (with probability 0.6).If the dog is in forest A
1. 2 answers
2. 4,491 views
You roll two five-sided dice. The sides of each die are numbered from 1 to 5. The dice are “fair" (all sides are equally
1. 1 answer
2. 5,837 views
Consider a competitive firm with a total cost function given by TC(q)=q^2/1000. Suppose that, in order to incentivize higher
1. 0 answers
2. 760 views
Consider a competitive firm that can sell its products at a price of p=10 $/unit. It's variable cost function is given by
1. 0 answers
2. 540 views
What is the cost of producing 100 units of output for a firm with a production function given by F(k,l)=10(min(2k,l))^0.5?
1. 0 answers
2. 521 views
You continue to record the spikes of a ganglion cell. Even in total darkness, there is some nonzero rate of spiking (sometimes
1. 0 answers
2. 448 views
The video compared a retinal neuron to a spy looking through a keyhole at the world. The keyhole is analogous to the1. lens of
1. 0 answers
2. 449 views
Consider two ganglion cells with cell bodies that are adjacent to each other in the retina. Their receptive fields are1.
1. 0 answers
2. 409 views
If you move your eyes to the right, the receptive fields of your neurons will shift in the visual world to the1.left 2.right
1. 0 answers
2. 376 views
The DNA of a neuron is located in its1. dendrite 2. axon 3. cell body 4. Golgi apparatus
1. 2 answers
2. 895 views
The longest neurite of a neuron is typically a:1. cell body 2. dendrite 3. axon 4. none of the above
1. 0 answers
2. 513 views
A neuron has:1. a single cell body or soma 2. one or two cell bodies or somata 3. its nucleus in the axon 4. none of the above
1. 0 answers
2. 471 views
Consider a sample of well-annealed copper. Find the Burger's vector given that the energy per unit line length is
1. 0 answers
2. 432 views
What is the exact strain energy per unit length of an edge dislocation for a material that has a Young's modulus E of 50GPa, a
1. 2 answers
2. 1,147 views
A material has a Young's modulus E of 50GPa, a Burger's vector b of 0.25nm, and a Poisson's ratio ν of 0.3.What is the
1. 0 answers
2. 783 views
Use Propositional Resolution to show that the clauses {p, q}, {¬p, r}, {¬p, ¬r}, {p, ¬q} are not simultaneously satisfiable.
1. 0 answers
2. 805 views
Given the premises (p ⇒ q) and (r ⇒ s), use Propositional Resolution to prove the conclusion (p ∨ r ⇒ q ∨ s).Proof
1. 2 answers
2. 1,049 views
Calculate the elastic buckling collapse stress (the compressive strength), σ∗el, for an open-cell polystyrene foam with a
1. 2 answers
2. 996 views
Compare the Young's modulus E∗ of two open-cell foams. Which Young's modulus is higher? Recall that C1=1.1. polystyrene:
1. 1 answer
2. 921 views
You have a stainless steel hollow rod (E=193GPa,ν=0.29) that has an inner radius r of 1.2cm, a wall thickness t of 0.7mm, and a
1. 1 answer
2. 1,141 views
You have 1kg of aluminum (E=69GPa) to make a cylindrical tube with a high Euler buckling load. The tube must have a length L of
1. 0 answers
2. 779 views
Four identical pin-pin ended solid concrete cylindrical columns that are L=10m tall need to be able to withstand 6.8×108N of
1. 1 answer
2. 1,091 views
Calculate the deflection v at the free end, B, for the beams shown below. Both beams have the same rectangular cross section.
1. 0 answers
2. 613 views
A rectangular beam, with cross-sectional width b, height h, Young's modulus Erect, has the same flexural rigidity as a circular
1. 1 answer
2. 1,618 views
A cantilever beam, made of a material with a Young's modulus, E with a rectangular cross section with a moment of inertia I, is
1. 3 answers
2. 1,247 views
A hollow cylinder with outer radius r0 and inner radius ri is loaded by a uniformly distributed load q across its length L. The
1. 1 answer
2. 1,477 views

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