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qwerty
Questions and answers by
qwerty
, page 3
Questions (293)
Four identical pin-pin ended solid concrete cylindrical columns that are L=10m tall need to be able to withstand 6.8×108N of
2 answers
1,007 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 answer
667 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
2 answers
1,039 views
Compare the Young's modulus E∗ of two open-cell foams. Which Young's modulus is higher? Recall that C1=1.
1. polystyrene:
2 answers
831 views
Calculate the elastic buckling collapse stress (the compressive strength), σ∗el, for an open-cell polystyrene foam with a
3 answers
898 views
Given the premises (p ⇒ q) and (r ⇒ s), use Propositional Resolution to prove the conclusion (p ∨ r ⇒ q ∨ s).
Proof
3 answers
964 views
Use Propositional Resolution to show that the clauses {p, q}, {¬p, r}, {¬p, ¬r}, {p, ¬q} are not simultaneously satisfiable.
1 answer
707 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 answer
722 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
3 answers
1,055 views
Consider a sample of well-annealed copper. Find the Burger's vector given that the energy per unit line length is
1 answer
376 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 answer
389 views
The longest neurite of a neuron is typically a:
1. cell body 2. dendrite 3. axon 4. none of the above
1 answer
425 views
The DNA of a neuron is located in its
1. dendrite 2. axon 3. cell body 4. Golgi apparatus
4 answers
807 views
If you move your eyes to the right, the receptive fields of your neurons will shift in the visual world to the
1.left 2.right
1 answer
325 views
Consider two ganglion cells with cell bodies that are adjacent to each other in the retina. Their receptive fields are
1.
1 answer
346 views
The video compared a retinal neuron to a spy looking through a keyhole at the world. The keyhole is analogous to the
1. lens of
1 answer
384 views
You continue to record the spikes of a ganglion cell. Even in total darkness, there is some nonzero rate of spiking (sometimes
1 answer
397 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 answer
449 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 answer
462 views
Consider a competitive firm with a total cost function given by TC(q)=q^2/1000. Suppose that, in order to incentivize higher
3 answers
641 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
4 answers
5,684 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
3 answers
4,347 views
Before leaving for work, Victor checks the weather report in order to decide whether to carry an umbrella. On any given day,
5 answers
6,438 views
Consider the communication network shown in the figure below and suppose that each link can fail with probability p. Assume that
4 answers
5,043 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
5 answers
7,579 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,
4 answers
5,289 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,
2 answers
2,218 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
3 answers
544 views
A fair, 6-sided die is rolled 6 times independently. Assume that the results of the different rolls are independent. Let
7 answers
1,033 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
6 answers
1,907 views
Consider three random variables X, Y, and Z, associated with the same experiment. The random variable X is geometric with
6 answers
1,086 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
3 answers
786 views
Consider three random variables X, Y, and Z, associated with the same experiment. The random variable X is geometric with
3 answers
892 views
Let U, V, and W be independent standard normal random variables (that is, independent normal random variables, each with mean 0
1 answer
1,015 views
Let X be a random variable that takes non-zero values in [1,∞), with a PDF of the form
fX(x)=⎧⎩⎨cx3,0,if x≥1,otherwise.
1 answer
652 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 answer
725 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 answer
528 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 answer
603 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
3 answers
1,076 views
Let X and Y be independent random variables, each uniformly distributed on the interval [0,2].
Find the mean and variance of XY.
3 answers
1,086 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 answer
533 views
Uncle Henry has been having trouble keeping his weight constant. In fact, during each week, his weight changes from the
3 answers
633 views
Let θ be an unknown constant. Let W1,…,Wn be independent exponential random variables each with parameter 1. Let Xi=θ+Wi.
Wha
2 answers
613 views
A dedicated professor has been holding infinitely long office hours. Undergraduate students arrive according to a Poisson
1 answer
533 views
Consider a Markov chain X0,X1,X2,… described by the transition probability graph shown below. The chain starts at state 1;
3 answers
929 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
2 answers
672 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
2 answers
638 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 answer
697 views
How could the development of a smart grid help protect the environment?
a. a smart grid uses only renewable energy sources b. a
7 answers
1,539 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 answer
333 views
If the KCLO3 were not completely decomposed, would your calculated values for percent oxygen in KCLO3 be too high, too low or
2 answers
581 views
The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm
4 answers
2,640 views
the two-party system that we know today developed from which political struggle
A: interpretive powers of the supreme court B:
9 answers
4,006 views
which of the following was NOT a characteristic of native american societies during the mississippian period
7 answers
2,386 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
4 answers
639 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.
5 answers
1,068 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.
5 answers
1,163 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
5 answers
3,708 views
Consider the function f(x)=x^n e^(-2x) for x >/= 0, n > 2
A. Find the constant n for which the function f(x) attains its maximum
4 answers
1,195 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 answer
174 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 answer
381 views
State the nature of the roots of any quintic function.
1 answer
152 views
A 50mL of 0.50M hydrofluoric acid (Ka = 7.2 x 10^-4) is titrated with a 0.20M
sodium hydroxide solution. What is the pH of the
5 answers
335 views
N2 + 3H2 ⇌ 2NH3, equilibrium constant = 6.0 x 10^-2
find the reaction quotient and the direction in which the system will shift
1 answer
449 views
A 50mL of 0.50M hydrofluoric acid (Ka = 7.2 x 10^-4) is titrated with a 0.20M
sodium hydroxide solution. What is the pH of the
3 answers
351 views
Choose the word or phrase that best matches the word in italics.
Jason was looking forward to a 𝘵𝘢𝘯𝘨𝘪𝘣𝘭𝘦
4 answers
1,084 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 answer
361 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?
4 answers
425 views
Which situation describes a non-contact force changing the speed of an object?
1 answer
365 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 answer
77 views
In this pulley system, the pulleys will _____ the mechanical force required to lift the block and will change the _____.
4 answers
451 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
3 answers
195 views
The following sentences use different words to convey a similar meaning. Assess which sentence uses precise language.
3 answers
114 views
The following sentences use different words to convey a similar meaning. Assess which sentence uses precise language.
Elliot
3 answers
283 views
Determine which word in the following passage was chosen to convey a connotative meaning. Then, explain what this word means.
1 answer
69 views
Determine which word in the following passage was chosen to convey a connotative meaning. Then, explain what this word means.
Gag
4 answers
186 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
3 answers
114 views
Which two forms of writing have the similar purpose of entertaining an audience? Select the two correct answers.(1 point)
4 answers
238 views
Which two forms of writing have the similar purpose of entertaining an audience? Select the two correct answers.(1 point)
A.
1 answer
122 views
Explain how pacing can impact the tone of a narrative piece of writing. Write 1-2 sentences.(2 points)
1 answer
71 views
Fill in the blanks
Pacing is how _____ or _____ the action in the story takes place. This is an important and serious topic.
1 answer
129 views
Fill in the blanks
Pacing is how _____ or _____ the action in the story takes place. This is an important and serious topic.
1 answer
177 views
Which is the most likely patron for a community mural that will celebrate a city-wide day of reading?
1 answer
151 views
Amy’s Metaphor, by Elisa Oh, is about a girl that completes an assignment about a metaphor about herself. She tells her
4 answers
430 views
Amy’s Metaphor, by Elisa Oh, is about a girl that completes an assignment about a metaphor about herself. She tells her
4 answers
284 views
show me a picture
1 answer
50 views
is brainy a good website
10 answers
65 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 answer
91 views
Cats and dogs are typically differentiated in terms of their physical attributes, temperament, and behavior. Physically, cats
1 answer
90 views
cosx=-root2/3 and x is in quadrant 3
Use identities to find the exact values at x for the remaining five trigonometric functions
2 answers
144 views
cotx = -3/5,-pi/2<x<0
Use identities to find the exact value for the remaining five trigonometric functions
4 answers
97 views
What inference can you make, based on the information in this paragraph?
Professor Lucy Dobbs of the School of Industrial and
2 answers
82 views
Which is the origin of the sun's energy
a. nuclear fusion b. burning hydrogen c. solar flairs. c. charged particles
3 answers
78 views
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