# Questions

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1. ## Physics

A body of mass 3 kg experiences a force F=(2i +2j) N. If its initial velocity v=( -8i + 4j) m/s, then the time at which it will have a velocity just along the y-axis is ? (The expressions contain vector notations above them)

2. ## Maths

if 5 is added to each observation of data what will be the difference in the median Fast please

3. ## ENGLISH

SENTENCE PATTERN We painted the wall green yesterday

4. ## LIFE ORIENTATION

To what extent has the community have or been supporting communities affected by human right violations

5. ## Life Orientation

What role do the media have in reporting human rights violations in a responsible manner?

6. ## math

a clock is set right 9:00 pm and it gains 1 min in the first three hours and loses 1 min in every fourth hour and follows the same pattern there on .identify the time the clock will show at 1:00 pm the next day .

7. ## Life orientation

Write personal mission statement that clearly indicates your own position in engaging in service delivery protests that will be a good model to youth

8. ## life orienation

draw up any five interview question you will to evaluate the understanding of service delivery protest by the learners in school?

9. ## Life orientation

Give a brief description from your local newspaper of recent (2019-2021) example of how gender based violence has displayed itself in community town?

10. ## Math

A random variable X is generated as follows. We flip a coin. With probability p, the result is Heads, and then X is generated according to a PDF fX|H which is uniform on [0,1]. With probability 1−p the result is Tails, and then X is generated according

11. ## Probability

The random variable X is uniformly distributed over the interval [θ,2θ]. The parameter θ is unknown and is modeled as the value of a continuous random variable Θ, uniformly distributed between zero and one. Given an observation x of X, find the

12. ## Life orientation

Evaluate to what extent the following institutions have supported communities affected by gender based violence: Government Community(NGOs)and religious oganization

13. ## Probability

Let X be uniform on [0,1/2] . Find the PDF fY(y) of Y=X/(1−X) . For 0≤y≤1 : fY(y)= ?

14. ## English

Fame shall sound thy praise from sea to sea which figure of speech

15. ## statistics

Let 𝑋 and 𝑌 be independent positive random variables. Let 𝑍=𝑋/𝑌. In what follows, all occurrences of 𝑥, 𝑦, 𝑧 are assumed to be positive numbers. 1. Suppose that 𝑋 and 𝑌 are discrete, with known PMFs, 𝑝𝑋 and 𝑝𝑌.

16. ## Statistics

Suppose that X , Y , and Z are independent, with E[X]=E[Y]=E[Z]=2 , and E[X2]=E[Y2]=E[Z2]=5 . Find cov(XY,XZ) . cov(XY,XZ)= Let X be a standard normal random variable. Another random variable is determined as follows. We flip a fair coin (independent from

17. ## probability

We are given a stick that extends from 0 to x . Its length, x , is the realization of an exponential random variable X , with mean 1 . We break that stick at a point Y that is uniformly distributed over the interval [0,x] . 1. Find joint PDF fX,Y(x,y) of X

18. ## probability

The lifetime of a type-A bulb is exponentially distributed with parameter λ. The lifetime of a type-B bulb is exponentially distributed with parameter μ, where μ>λ>0. You have a box full of lightbulbs of the same type, and you would like to know

19. ## Life orientation

Write your personal mission statement that clearly indicates your own position in engaging in service delivery protests that will be a good model to the youth.

20. ## Algebra

The perimeter of the rectangle below is 74 units. Find the length of side AB . Write your answer without variables. DC (top) 4z-1 CB (right side) 3z+3 AB (bottom) unknown

21. ## Probability

We have k coins. The probability of Heads is the same for each coin and is the realized value q of a random variable Q that is uniformly distributed on [0,1]. We assume that conditioned on Q=q, all coin tosses are independent. Let Ti be the number of

22. ## Statistics and Probability

Let N be a random variable with mean E[N]=m, and Var(N)=v; let A1, A2,… be a sequence of i.i.d random variables, all independent of N, with mean 1 and variance 1; let B1,B2,… be another sequence of i.i.d. random variables, all independent of N and of

23. ## English

I am sure I would have regretted it if I ________ to take the job. a.would agree b.would have agreed* c. did agree d.had agreed*

24. ## unscramble

If you rearrange the letters "CARNEF", you would have the name of? A) a dog B) a city C) a country D) a province

25. ## L.o

Five INTERVIEW questions of service delivery protest

26. ## Probability

Let X and Y be independent positive random variables. Let Z=X/Y . In what follows, all occurrences of x , y , z are assumed to be positive numbers. 1) Suppose that X and Y are discrete, with known PMFs, pX and pY . Then, pZ|Y(z|y)=pX(?). What is the

27. ## Maths

We have Rs.100/-.If we spend Rs.100/-and balance is Rs.102/-,show how is Rs.2/-extra Spent Balance Day 1 Rs 40 Rs 60 Day 2 Rs 30 Rs 30 Day 3 Rs 18 Rs 12 Day 4 Rs 12 Rs 00 -------- -------- Total Rs 100 Rs102......?

28. ## Life Orantaition

State your position on this specific problem in South Africa

29. ## Math

Alice has two coins. The probability of Heads for the first coin is 1/4, and the probability of Heads for the second is 3/4. Other than this difference, the coins are indistinguishable. Alice chooses one of the coins at random and sends it to Bob. The

30. ## statistics

1. A random variable X is generated as follows. We flip a coin. With probability p, the result is Heads, and then X is generated according to a PDF fX|H which is uniform on [0,1]. With probability 1−p the result is Tails, and then X is generated

31. ## Math

A bag contains 3 apples and 2 oranges. Another bag contains 2 apples and 4 oranges . A bag and a fruit are picked at random. The probability that the fruit will be apple is

32. ## Math

Suppose that X, Y, and Z are independent, with E[X]=E[Y]=E[Z]=2, and E[X2]=E[Y2]=E[Z2]=5. Find cov(XY,XZ).

33. ## Life orientation

Describe Two Ways how social media platforms are abused

34. ## Life orientation

The impact of risky behaviour in social, emotional, physical and spiritual

35. ## maths

express 15.7121212... in the form p/q where p and q are integers and q not equal to 0.

36. ## chemistry

1.)An aqueous solution is 34.0% H3PO4 by mass and has a density of 1.207 g/mL. What is the molarity of the solution? AND what is the molality?

37. ## probability

Let 𝑋 and 𝑌 be independent positive random variables. Let 𝑍=𝑋/𝑌 . In what follows, all occurrences of 𝑥 , 𝑦 , 𝑧 are assumed to be positive numbers. 1. Suppose that 𝑋 and 𝑌 are discrete, with known PMFs, 𝑝𝑋 and 𝑝𝑌 .

38. ## maths

Sundaram joined a company for a fixed salary per month. After few months, the management felt happy with his work and multiplied his salary by some n times. This happened every few months and his salary kept getting multiplied and he reached a salary of

39. ## probability

The vertical coordinate (“height") of an object in free fall is described by an equation of the form x(t)=θ0+θ1t+θ2t2, where θ0, θ1, and θ2 are some parameters and t stands for time. At certain times t1,…,tn, we make noisy observations Y1,…,Yn,

40. ## English grammar

"Fame shall sound thy praise from sea to sea". Can this be considered an example of personification?

41. ## math

Conditioned on the result of an unbiased coin flip, the random variables T1,T2,…,Tn are independent and identically distributed, each drawn from a common normal distribution with mean zero. If the result of the coin flip is Heads, this normal

42. ## Science

A free proton and a free electron are placed in a uniform electric field. Which of the 2 will experience a greater acceleration?

43. ## Math

A bus service center has 2 feed services that start together at 8 a.m. Bus A leaves at 15 minutes interval, while bus B leaves at 20 minutes interval. On a particular day , how many times do both services leave together from 8 a.m. to 11 a.m.?

44. ## Probability

Let X=U+W with E[U]=m, var(U)=v, E[W]=0, and var(W)=h. Assume that U and W are independent. The LLMS estimator of U based on X is of the form U^=a+bX. Find a and b. Express your answers in terms of m, v, and h using standard notation. a=- unanswered b=-

45. ## Chemistry

Balance the following redox equations. All occur in Acidic solutions. 1. Cr2O7^2-^ + C2O4^2-^ -> Cr^3+^ + CO2 2. Cu + NO3^-^ -> CU^2+^ + NO 3. MnO2+ HNO2 -> Mn^2+^ + NO3^-^ 4. PbO2 + Mn^2+^ + SO4^2-^ -> PbSO4 + MnO4^-^ 5. HNO2 + Cr2O7^2-^ -> Cr^3+^ +

46. ## chemistry

A commercially available sample of sulphuric acid is 15% H2SO4 by mass (density=1.10g/ml) Calculate the molarity ,normality and molality.

47. ## Math

Find the value of an odd natural number x if LCM(x, 40)=1400

48. ## English

Write a debate on the topic;Boys should not help in the kitchen.Speak for or against the motion.

49. ## probability

Let X and Y be independent random variables, each uniformly distributed on the interval [0,1]. Let Z=max{X,Y}. Find the PDF of Z. Express your answer in terms of z using standard notation. For 0

50. ## probability

Let Θ be a Bernoulli random variable that indicates which one of two hypotheses is true, and let P(Θ=1)=p. Under the hypothesis Θ=0, the random variable X has a normal distribution with mean 0, and variance 1. Under the alternative hypothesis Θ=1, X

51. ## Study Skills Practice

What does it mean to survey a text? A. Read the text and take detailed notes B. Look for the main ideas C. Find the answers in your questions (picked this one) D. Answer questions out loud. Why should you consider your teacher a partner? A. Because you are

52. ## chemistry

1. Which example has particles that can be drawn closer to occupy smaller volume? a. fruit juice b. block of wood c. air inside the syringe d. ice cube 2. Which of the following phenomena does NOT involve the application of gas pressure? a. burning fuels

53. ## life orientation

Evaluate extent to which the service delivery protest have described in 2 above met or did not meet the requirements of processes

54. ## Chemistry

1)How many protons and electrons are in a sulfate ion SO4^2- ? I know the answer is 48 protons and 50 electrons but i do not know how to get this from the ion. 2) What is the charge on a sulfide ion? The answer is -2 but im not sure why. Is sulfide always

55. ## Probability

A defective coin minting machine produces coins whose probability of Heads is a random variable Q with PDF fQ(q)={3q2,0,if q∈[0,1],otherwise. A coin produced by this machine is tossed repeatedly, with successive tosses assumed to be independent. Let A be

56. ## Life Orientation project for 2021 june term-2

1.1.1. Define and describe gender-based violence. 1.1.2. Give a brief description from your LOCAL Newspapers of a recent (2019-2021) example of how this problem has displayed itself in your community/town. 1.1.3. State your own position on this specific

57. ## Life orientation

Give a description of a recent (2019 2021) example of how this problem has displayed in your community?

58. ## English

As a school prefect of your school write a speech on what your school needs

59. ## probability

As in the previous exercise, let È be the bias of a coin, i.e., the probability of Heads at each toss. We assume that È is uniformly distributed on [0,1]. Let K be the number of Heads in 9 independent tosses. We have seen that the LMS estimate of K is

60. ## life orientation

invitation letter to the municipal manager on processes of service delivery protest

61. ## Physics

an empty rd bottle weighs 60 grams but weighs 120 gram when completely filled with water when the bottle is completely with an unknown liquid it weighs 90 gram what will be the volume of the rd bottle

62. ## Life Orientation

Provide 4 strategies that communities could engage in to protest Gender based violence in their areas

63. ## physics

A 10uf capacitor is charged from a 30v supply and then connected across an uncharged 50uf capacitor.Calculate a. The final potential difference across the combination b. The final and initial energies

64. ## Life orientation

Give brief description your local newspaper of recent 2019 2021 example of how problems has displayed itself your community town

65. ## Probability

We are given a stick that extends from 0 to x . Its length, x , is the realization of an exponential random variable X , with mean 1 . We break that stick at a point Y that is uniformly distributed over the interval [0,x] . Find joint PDF fX,Y(x,y) of X

66. ## Probability

Question:A fair coin is flipped independently until the first Heads is observed. Let the random variable K be the number of tosses until the first Heads is observed plus 1. For example, if we see TTTHTH, then K=5. For K=1,2,3...K, let Xk be a continuous

67. ## differential equation

A simple pendulum of length is oscillating through a small angle θ in a medium for which the resistance is proportional to the velocity. Obtain the differential equation of its motion and discuss the motion.

68. ## statistics

Suppose that Θ , X1 , and X2 have zero means. Furthermore, Var(X1)=Var(X2)=Var(Θ)=4, and Cov(Θ,X1)=Cov(Θ,X2)=Cov(X1,X2)=1. The LLMS estimator of Θ based on X1 and X2 is of the form Θˆ=a1X1+a2X2+b . Find the coefficients a1 , a2 , and b . Hint: To

69. ## statistics

Recall that the MAP estimator for the problem of estimating the bias of a coin is 𝑋/𝑛 , which is different from the LLMS estimator (𝑋+1)/(𝑛+2) . How do they compare in terms of mean squared error (MSE)?

70. ## Life Orientation

give a description of a recent(2018-2020)example of how xenophobia has displayed itself in your community

71. ## statistics

Suppose that Θ and 𝑊 are independent, both with variance 1 , and that 𝑋=Θ+𝑊 . Furthermore, 𝐄[Θ]=1 and 𝐄[𝑊]=2 . The LLMS estimator Θˆ=𝑎𝑋+𝑏 has

72. ## Math

In the diagram triangle xyz is isosceles with xy=xz.Also,point w is on xz so that xw=wy=yz.The measure of angle xyw is

73. ## math

In a class of 150 students 70 passed in verbal and 90 passed in aptitude.10 failed in both the subject.how many students passed in both subject

74. ## Probability

A couple plans to have three children. What is the probability that a) they have all boys? b) they have at least one girl?

75. ## statistics

Suppose that the random variable Θ takes values in the interval [0,1]. a) Is it true that the LMS estimator is guaranteed to take values only in the interval [0,1]? b) Is it true that the LLMS estimator is guaranteed to take values only in the interval

76. ## General Chemistry

Liquid Freon (CCl2F2) is used as a refrigerant. It is circulated inside the cooling coils of older refrigerators or freezers. As it evaporates, it absorbs heat. How much heat can be removed by 2.00 kg of Freon as it evaporates inside the coils of a

77. ## Physics

A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. How long is she in the air before returning to Earth? (g = 9.81 m/s2)

78. ## math

Suppose that instead of estimators of the form aX+e , we consider estimators of the form Θˆ=aX and ask for the value of a that minimizes the mean squared error. Mimic the derivation you have just seen and find the optimal value of a . Your answer should

79. ## algebra

If p≠q and p² = 5p-3 and q² = 5q-3 the equation having roots as p/q and q/p is

80. ## Probability LMS Estimation

Let Θˆ be an estimator of a random variable Θ, and let Θ˜=Θˆ−Θ be the estimation error. a) In this part of the problem, let Θˆ be specifically the LMS estimator of Θ. We have seen that for the case of the LMS estimator, E[Θ˜∣X=x]=0 for

81. ## chemistry

20) The ideal value of i (van't Hoff factor) for (NH4)3PO4. A) 2 B) 5 C) 4 D) 3 E) 1 I know the answer but how are problems like this figured out?

82. ## chemistry

in what ratio 0.2M NaCl and 0.1M CaCl2 solutions are to be mixed so that in the resulting solution, the concentration of negative ions is 50% greater than the concentration of positive ions?

83. ## Probability

Let Θ be a Bernoulli random variable that indicates which one of two hypotheses is true, and let P(Θ=1)=p. Under the hypothesis Θ=0, the random variable X is uniformly distributed over the interval [0,1]. Under the alternative hypothesis Θ=1, the PDF

84. ## Science

Calculate the normality and molarity of h2so4 solutions containing 4.9g of h2so4 per liter of solutions?

85. ## statistics

We wish to estimate an unknown quantity Θ. Our measuring equipment produces an observation of the form X-Θ3 + W, where W is a noise term which is small relative to the range of Θ. Which type of linear estimator is preferable in such a situation?

86. ## Math

As in an earlier exercise, we assume that the random variables Θ and X are described by a joint PDF which is uniform on the triangular set defined by the constraints 0≤x≤1 , 0≤θ≤x . a) Find an expression for the conditional mean squared error of

87. ## probability

Let Θ and X be jointly continuous nonnegative random variables. A particular value x of X is observed and it turns out that fΘ|X(θ|x)=2e−2θ , for θ≥0 . The following facts may be useful: for an exponential random variable Y with parameter λ , we

88. ## probability

Consider n independent rolls of a k-sided fair die with k≥2: the sides of the die are labelled 1,2,…,k and each side has probability 1/k of facing up after a roll. Let the random variable Xi denote the number of rolls that result in side i facing up.

89. ## Math

The random variables Θ and X are described by a joint PDF which is uniform on the triangular set defined by the constraints 0≤x≤1 , 0≤θ≤x . Find the LMS estimate of Θ given that X=x , for x in the range [0,1] . Express your answer in terms of x

90. ## precalculus

Outside temperature over a day can be modelled as a sinusoidal function. Suppose you know the temperature is 80 degrees at midnight and the high and low temperature during the day are 90 and 70 degrees, respectively. Assuming t is the number of hours since

91. ## probablity

Let Θ1, Θ2, W1, and W2 be independent standard normal random variables. We obtain two observations, X1=Θ1+W1,X2=Θ1+Θ2+W2. Find the MAP estimate θ^(theta hat)=(θ^1,θ^2) of (Θ1,Θ2) if we observe that X1=1, X2=3. 1.θ^1 (theta hat)=? 2.θ^2(theta

92. ## probability

Let È be the bias of a coin, i.e., the probability of Heads at each toss. We assume that È is uniformly distributed on [0,1]. Let K be the number of Heads in 9 independent tosses. By performing some fancy and very precise measurements on the structure of

93. ## life orientation

Give a description of a recent (2018-2021) example of how this problem has display itself in your community

94. ## Math

Sports team won twice as many games as they lost. The sum of games won and games lost was 42 games. How many games did they win?

95. ## Riddle

Is probably seen this dance before your feet don't ever leave the floor the hardest part is getting arms and hips to move at the same time in opposite the name is funny but can also mean something you used to keep your teeth clean what am I

96. ## chemistry

1. In the reaction 2Ca(s) + O2(g) → 2CaO(s), which species is oxidized?

97. ## statistics

Suppose that fÈ and fX|È are described by simple closed-form formulas. Suppose that È is one-dimensional but X is high-dimensional. a) Suppose that a specific value x of the random variable X has been observed. Is it true that the calculation of the LMS

98. ## life orientation

six ways in which human rights violation influences individuals,groups and broader south african community.my answer was 1.it maKES THEM ANGRY BECAUSE THEY GET TO LOSE THEIR BELONGINGS...2.THEY HAVE TO SUFFER EMOYIONALLY OR PHYSICALLY....3.THEY LOSE

99. ## maths

Suppose that the random variables Θ and X are not independent, but E[Θ∣X=x]=3 for all x . Then the LLMS estimator of Θ based on X is of the form aX+b , with a= b=

100. ## math Study guide 3

1. The table shows the results of spinning a four-colored spinner 50 times. Find the experimental probability and express it as a decimal. P(not red) = ? red | blue | green | yellow ----------------------------------------- 20 | 10 | 9 | 11 (1 point) a 0.6