# Questions Asked onOctober 31, 2016

1. ## Chemistry

Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X. The enthalpy of formation of MX2 is ΔHf° = –799 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 157 kJ/mol. The first and second ionization energies of M

2. ## Physics

A flywheel in the form of a uniformly thick disk of radius 1.48 m, has a mass of 43.6 kg and spins counterclockwise at 303 rpm. Calculate the constant torque required to stop it in 2.50 min.

3. ## Physics

A uniform disk of radius 0.485 m and unknown mass is constrained to rotate about a perpendicular axis through its center. A ring with same mass as the disk\'s is attached around the disk\'s rim. A tangential force of 0.247 N applied at the rim causes an

4. ## Physics

A student holds a bike wheel and starts it spinning with an initial angular speed of 7.0 rotations per second. The wheel is subject to some friction, so it gradually slows down. In the 10-s period following the inital spin, the bike wheel undergoes 60.0

5. ## Pre-Calc/ Trig

Find the sum of the three smallest positive values of theta such that 4(cos^2)(2theta-pi) =3. (Give your answer in radians.) LaTEX: Find the sum of the three smallest positive values of $\theta$ such that $4\cos^2(2\theta-\pi) =3$. (Give your answer in

6. ## Physics

A piece of copper ball of mass 30grams at 150 degree celcius is placed in a copper calorimeter of mass 70gams containing 60grams of waterof copper 40degree celcius if the final ofthe mixture is 50degree celcius calculate the specific heat capacity of

7. ## Physics

A long, straight wire with a circular cross section of radius R carries a current I. Assume that the current density is not constant across the cross section of the wire, but rather varies as J=αr, where α is a constant. A) By the requirement that J

8. ## Math

Tickets at a fair cost $0.75 each. You can also buy a roll of 25 tickets for$15.00. What is the cost of each ticket if you buy a roll of tickets.

9. ## science, organic chemistry

Determine the amount of compound remaining in the aqueous phase and organic phase and organic phase if a 5.0g organic compound is dissolved in 100 mL of water and is extracted with three 50-mL portion of ether (kb= 10). Compare this with one 150 ml portion

58. ## algebra 2

Reuben deposited $2000 into an account with a 3.8% annual interest rate, compounded semiannually. Assuming that no withdrawals are made, how long will it take for the investment to grow to$3000?

59. ## Physics

A spring is attached to the top of a table. The spring has a spring constant of 500.0 N/m. The spring is initially compressed by 1.50 m by a baseball (0.145 kg). How much energy is present in the system from the compression? After release, what is the

60. ## Algebra2

What is the vertex form of the equation? Show steps y=-x^2+12x-4

69. ## History

What is the main reason some people believe there should not be any limits on presidential terms? A. There should be a monarch instead of a president. B. The people should decide how long a president can serve in a democracy.

70. ## Algebra2

A quadratic equation can be written in vertex form or in standard form. Sometimes one form is more beneficial than the other. Identify which form would be more helpful if you needed to do each task listed below and explain why. a- factor the equation b-

71. ## Math: Help MEEE!!!!!!

–0.6n ≤ 9.6 n ≥ –16 n ≥ 16 n ≤ –16 n ≤ 16 I Think Its n ≤ 16, Can U Help?

72. ## science

A motorcyclist (with a total mass of 180kg) travels up a hill. When she starts at the bottom of the hill (altitude 32m) her velocity is 43km/h. At the top of the hill (altitude 365m) she has a speed of 115km/h. The hill is 12km long and during the journey

73. ## Language Arts urgent!!

A student is writing a paper and needs to make sure she is using the word apprehension correctly. What reference book would help her check its part of speech?

74. ## Algebra

The revenue in dollars from the sale of concert tickets at x dollars each is given by the function R(x)=46,400x-800x^2. Find the difference quotient when x=27 a h=0.1, and when x=31and h=o.1. Intepret your answers

75. ## History

Which statement best explains the reason the Americans were never able to capture St. Augustine in Florida. A) A lack of cooperation among commanders led to poor execution.*** B) Poor planning and incompetent leaders led to disastrous outcomes. C) The

76. ## ENGLISH FAST!!!!

Which synonym for fear most strongly suggests a fear that causes one to freeze in terror? Alarm Dread Fright Panic I say D

77. ## physical chemistry

Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3

78. ## Spanish

Write 2 short paragraphs describing famous people from the Spanish speaking world. Make sure to include their cultural or political significance in your discussion.

79. ## American Gov.

in the case of schenck vs united states justice oliver wendell holmes jr wrote: "the most stringent protection of free speech would not protect a man in falsely shouting fire in a theatre and causing a panic." this is an example of what kind of rights? a.

80. ## check my work (american goverment)

1.  Why was the Department of Defense created? (1 point) to place the U.S. Army and Navy in one executive department to establish a military chain of command to end disagreements between the U.S. Army and Navy

82. ## English Beowulf

How did the culture of Beowulf view pride? Why?

83. ## Algebra

- 2/5 x - 9 < 9/10

84. ## Math

A certain person burn 6.5 calories per minute while walking how many calories will be burned if that person wants for 3 hours round your answer to the nearest tenth

85. ## Geography

Draw diagram to help find M angle ABD when M angle ABC equals 66 M angle ABD equals 5x + 3 and M angle DBC equals X plus 3

86. ## English

In the story “If I Forget Thee, Oh Earth…” why did Marvin’s father take him to see the view of earth from The Colony? A. The Colony had just discovered earth as a new planet in their galaxy, and he wanted to share the exciting news. B. He wanted

87. ## african american history

Does the fact that masters felt compelled or that it was to their benefit to recognize such "rights" indicate the limits of their hegemony over the slave

88. ## chemistry (charges)

just want to check if this group is neutral, R-NH2 thanks!

89. ## Science 7

a student made an electromagnet using a battery electrical tape and metal wire. she wanted to see what the effect would be if she switched the side of the battery she connected each end of the wire to. which of the following would be a correct conclusion

90. ## Math

Situation: You exercised 24 hours each month for a year. How many hours did you exercise by the end of the year? You may be able to do the math mentally thanks to expanded notation and the Distributive Property How would I put this into distributive

91. ## Sand Dunes (Science)

Every year, Eli and his family visit the Great Sand Dunes desert in Colorado. Eli notices that more sand dunes with varied shapes and sizes appear each year. Explain what causes this phenomenon. PLZ DO NOT SAY WIKI!!!!!!!!

92. ## Maths

How would you decide the probability of each of the following? Choose A equally likely outcomes, or B experimental evidence . Write A and B on the answer line. Questions: First: A die is thrown. What proportion of times is 6 scored? Second: One hundred

93. ## physics

a uniform pole 7m long and weighing 10kg suppoted by a boy 2m from one end man3 from other end

94. ## Pretty pleaaase Help

As you watch a surfer ride a wave toward the shoreline, what is the shoreline. a. reference point b.distance being travled c.delta d.displacement refrence

95. ## Pre Algebra

Translate the word phrase into a variable expression: the sum of 16 and 4 times a number

96. ## value

A number is picked from the set p:{2,3,4,5,___9} find the probability that the number is prime.

97. ## Pre Algebra

Translate the variable expression into a word phrase: 2*(3-x)

98. ## Pre Algebra

Look at Arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 Describe the mistake that Arnold made.

99. ## algebra 2

Traveling with the wind, an airplane travels 210 miles im 4 hours. Against the wind, it takes six hours. Find the rate of the plane in still air and the velocity of the wind.

100. ## Math

Jessica has 8 1/7 pounds of dog food. Feeds 1/7 pound per day. How many days will dog food last?

101. ## Pre Algebra

Use a five-step plan to solve the following word problem. Show all five steps in your response: Doug is twice Anne's age. Doug is 34 years old. How old is Anne?

102. ## Applied math

The temperature on Monday was -2 degrees Fahrenheit by noon it had warmed up to 5 degrees Fahrenheit how many degrees did the temperature change

103. ## Math

Two identical circles of largest possible area are to be cut from a 12in by 24in rectangular piece for stock. Find the amount of waste.

104. ## math

If i make 45 cakes and sell 3/5 how many did i sell?...... 45Ã—3/5=?...idk.its for my daughter homework.idk even know how to do it ,let alone the answer. Thank u very much for your time.

105. ## Physics

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 36.761s for the dart to land back at the barrel. What is the maximum

106. ## chemistry

If I only have the name of this transitional coordination compound, bis(enthylenediamine)dinitroiron (III) sulphate how do you find the 2 outside the square bracket of this same thing but in formula form? [Fe (en)2 (NO2)2]2SO4 thanks.

107. ## Calculus

The velocity of an object is given by v(t)=t(t^2-1)^(1/3) feet per second. Find the total number of feet traveled by the object in the time interval [0,3] seconds. (A)51/4 (B)34/3 (C)45/4 (D)51/8 (E)45/8

108. ## probability and Stats

How can I find standard error from each of the following: a) a proportion & a sample size? b) mean, standard deviation, and sample size? c) mean & standard deviation? thank you

109. ## Probability & Stats

An experiments consists of tossing 4 coins successively. The number of sample points in this experiment is a. 16 b. 8 c. 4 d. 2 Please show work and why it is the answer! Thank you!

1) If a number has 2 and 6 as factors, then it has 12 as a factor 2) if a number has 12 as a factor, then both 2 and 6 are factors. The first statement is false. The second statement is true. Explain why, using words

111. ## Calculus

The measurement of the circumference of a circle is found to be 70 centimeters, with a possible error of 0.9 centimeter. a) Approximate the percent error in computing the area of the circle. (Round your answer to two decimal places.) b) Estimate the

112. ## Science

Imagine Two Artificial Satellites Orbiting Earth At The Same Distance. One Satellite Has A Greater Mass Than The Other One? Which Of The Following Would Be True About Their Motion? A.The satellite with the greater mass is being pulled toward Earth w/ less

113. ## Physics

A girl delivering newspapers travels 3 blocks west, 8 blocks north, then 5 blocks east. 1) What is the magnitude of her resultant displacement? Answer in units of blocks. 2) Find the direction (measured from due east, with counterclockwise positive) of her

114. ## Science

a student made an electromagnet using a battery electrical tape and metal wire. she wanted to see what the effect would be if she switched the side of the battery she connected each end of the wire to. which of the following would be a correct conclusion?

115. ## physics

A car travels at a constant speed around a circular track whose radius is 2.87 km. The car goes once around the track in 332 s. What is the magnitude of the centripetal acceleration of the car?

116. ## Math

How much in 6.5cups = to fl oz ?

117. ## Physics

When the Sun is directly overhead, a hawk dives toward the ground at a speed of 6.09 m/s. If the direction of his motion is at an angle of 78.6 â—¦ below the horizontal, calculate the speed of his shadow along the ground. Answer in units of m/s

118. ## chemistry

what is the name of this coordination compound [CoSO4(NH3)5]Br?

119. ## Math

There are 4 sections of seat in the playhouse theatre. Each section has7 groups of seats.each group has 25 seats. How many seats are there in the theater? 25Ã—7=175 seats

120. ## Science

What caused the syringe to leave a puddle of water after sitting in the sun for 10 minutes ?

121. ## Organic Chemistry

Draw the product of the reaction: CH3CH2CH (double bond) CH2 + Cl2

140. ## Math

One positive number is two more than a second number their product is 168

141. ## Algebra2

Which points are the best approximation of the relative maximum and minimum of the function? f(x)=x^3+3x^2-9x-8

I need to find and write the equation for the problem. Layla wants to but a smart phone online using a $50 discount coupon along with a 20% discount on the original cost of the phone. Layla can spend up to$150. Write an inequality to find the original

143. ## Science

A tree that sheds its leaves in the fall is exhibiting. A geotropism B photomotropism C phototropism D photoperiodism

156. ## Math

Gabriel can ride his bike three times faster than he can run. He runs 9 miles and bikes 45 miles. If the total time for both activities is four hours, how fast can he run ?

157. ## Algebra

In triangle QRS, measure of angle R is 20 degrees more than measure of angle Q and measure of angle S is 115 degrees more than measure of angle Q. Find measure of angle R.

158. ## Math

Alex can complete a model rocket assembly in four hours less time than it takes Sean. Working together, they can complete the assembly in one and a half hours. How long would it take Alex to do the assembly working alone?

159. ## brief calc

Calculate the total area of the region described. Do not count area beneath the x-axis as negative.Bounded by the line y = 6x, the x-axis, and the lines x = 4 and x = 5

160. ## geometry

The radius of a circle given C (4,-1) and (8,2). What is the equation that defines the circle if its center is at the fourth quadrant?