# joe

Popular questions and responses by joe
1. ## trigonometry

the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65 degree and 40 degree respectively find the two legs. Answer using law of sines pls

2. ## Algebra

THe function h(t)=-16t^2+v0t+h0 describes the height in feet above the ground h(t) of an object thrown vertically from a height of h0 feet, with an initial velocity of v0 feet per second, if there is no air friction and t is the time in seconds sine the

3. ## pre calculus

cube roots of 64i?

4. ## chem

How many moles of C6H12O6 are formed when 0.250 mole of CO2 is consumed in the reaction 6 CO2 + 6 H2O C6H12O6 + 6 O2?

5. ## physics

when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring stretches 2.76 cm. A) what is the force constant of the spring. B) if the 2.50 kg object is removed how far will the spring strecth if a 1.25 kg block is

6. ## Math

5 basketball teams play each other once. How many games are played?

7. ## Chemistry

What volume of “wet” methane would have to be collected at 20.0 oC and 760.0 torr to be sure the sample contained 2.00 x 102 ml of dry methane at the same temperature and pressure ? My Work: All I have so far is that I use P1V1=P2V2 but I don't know

8. ## Chem 2

what is the solubility of silver carbonate in water in 25 degrees celcius if Ksp=8.4X10-12? i don't know what to do Write the equation. Ag2CO3(s) ==> 2Ag^+ + CO3^= Ksp = (Ag^+2)(CO3^=) Let x = solubility of Ag2CO3. At equilibrium,(Ag^+) = 2x; (CO3^=) = x.

9. ## Chemistry

the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.55 years

10. ## algebra

Sophie is buying fabric to make items for a craft fair. The table shows some combinations of how much of each color fabric she might buy. Which equations model the total yards of fabric Sophie will buy? Check all that apply.

11. ## Physics

Block 1, of mass m1 = 0.650kg , is connected over an ideal (massless and frictionless) pulley to block 2, of mass m2, as shown. For an angle of θ = 30.0∘ and a coefficient of kinetic friction between block 2 and the plane of μ = 0.400, an acceleration

12. ## Physics

On a frictionless, horizontal air track, a glider oscillates at the end of an ideal spring of force constant 2.30 N/cm. The graph in the figure shows the acceleration of the glider as a function of time. Find the mass of the glider. Find the maximum

13. ## Math 124

There are several ways you might think you could enter numbers in WebAssign, that would not be interpreted as numbers. N.B. There may be hints in RED!!! You cannot have commas in numbers. You cannot have a space in a number. You cannot substitute the

14. ## Math

112 is the product of Rick's height and 7

15. ## English

This question isn't a homework question, but this relates to English grammar. Would I capitalize the name of this food item? I've seen people use both lowercase and capitalization. This *Chicken Croissant Casserole* was so good!

16. ## English

What are some other ways to say ”That's generous”?

What did the spanish farmer say to his chicken

18. ## Physics

One end of a uniform 3.20-m-long rod of weight Fg is supported by a cable at an angle of θ = 37° with the rod. The other end rests against the wall, where it is held by friction as shown in the figure below. The coefficient of static friction between the

19. ## physics

a longitudinal wave with a frequency of 3.0 Hz takes 1.7 s to travel the length of a 2.5-m slinky (see figure 16.3). Determine the wavelength of the wave.

20. ## math

Macy's Department Stores markup men's cologne 63% on cost for an 8-ounce bottle. A bottle of cologne costs Macy's $23.00. What is the selling price for the 8-ounce bottle?$31.51

21. ## math

a man who is 5 feet tall stands 15 feet from a lamppost that is 27 feet high. how far away from the man is the tip of his shadow?

22. ## physics

A 1.5-kg cart is pulled with a force of 7.3 N at an angle of 40° above the horizontal. If a kinetic friction force of 3.2 N acts against the motion, the cart’s acceleration along the horizontal surface will be

23. ## chemistry

The activation energy of a certain uncatalyzed biochemical reaction is 50.0 kJ/mol. In the presence of a catalyst at 37°C, the rate constant for the reaction increases by a factor of 2.50 ✕ 103 as compared with the uncatalyzed reaction. Assuming the

24. ## math

From a standard 52 card deck, how many 5 card hands will have 2 clubs and 3 hearts?

25. ## Chem

A mass spectrum of phosporus atoms shows only a single peak at a mass of 31 what can you conclude from this observation?

26. ## Precalc

Find a possible formula for the trigonometric function whose values are in the following table (note the values in the table may be slightly rounded): x 0.00 0.17 0.33 0.50 0.67 0.83 1.00 1.17 1.33 1.50 1.67 1.83 2.00 g(x) 4.00 5.50 6.60 7.00 6.60 5.50

27. ## Physics

An object of mass 1.00 kg is attached to a vertical spring with spring constant 100 N/m. The object is held at rest in a position such that the spring is stretched upward a distance 1.00 cm beyond its undisturbed length. If the object is released, how far

28. ## Physics

With a 1220–W toaster, how much electrical energy is needed to make a slice of toast (cooking time = 1.3 minute)? At 12.1 cents/kW·h, how much does this cost? (You do not need to enter any units.)

29. ## Physics

An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 8.26 m/s2. Determine the orbital period of the satellite.

30. ## Chemistry

Calculate the pH at the equivalence point for the titration of 0.130M methalamine (CH3NH2) with 0.13M Hcl. The Kb of methyl amine is 5.0x10-4.

31. ## Chemistry

For the reaction 2NH3(g) 3H2(g) N2(g) at 472oC equilibrium is established when [H2] =0.0200M, [N2] = 0.0100M and [NH3] = 5.37x10^_8 M. What is the equilibrium constant for the reverse reaction?

32. ## algebra

The sum of a number and three times another number is 18. Find the number if their product is a maximum.

33. ## math

Chances are 50-50 that a newborn baby will be a girl. For families with five children, what is the probability that all the children are girls

34. ## physics

A science museum has asked you to design a simple pendulum that will make 25.0 complete swings in 85.0 {\rm s}. How long should the pendulum be? in meters

35. ## Math

Calculate the probability that 200 rolls of two dice rolls will include a) more than 30 sums of 5 b) between 30 and 40, inclusive, sums of 5

36. ## Physics

A ball (mass m = 250 g) on the end of an ideal string is moving in a circular motion as a conical pendulum. The length L of the string is 1.84 m and the angle with the vertical is 37 degrees. a) What is the magnitude of the torque (N m) exerted on the ball

37. ## physics

An oxygen molecule consists of two oxygen atoms whose total mass is 5.3 x 10-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.82 × 10-46 kg·m2. From these data, estimate the

38. ## chemistry

1.) How much ethanol, C2H5OH, in liters (d=0.789g/ml) must be dissolved in water to produce 190.5 of 1.65 M C2H5OH? (Molarity problem.) 2.) How much concentrated hydrochloric acid solution (36.0% HCl by mass, d = 1.18g/mL}), in milliliters, is required to

39. ## physics

A 67.7 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.04 m under the surface of the water. Determine the magnitude of the average force that the water exerts on

40. ## Electric Power Tools

I need help with my test, I don't know if they are all right or not. I answered the questions to the best of my ability. My answers are marked with an *. 1. What is the typical no-load speed of a high-speed drill? A. 1,000 rpm *B. 2,500 rpm C. 3,000 rpm D.

41. ## chem

Benzaldehyde, C6H5CHO}, has a normal boiling point of 179.0 C and a critical point at 422 C and 45.9 atm. Using a phase diagram, estimate its vapor pressure at 125 Degrees I'm directing it up again to Dr. Bob. (or anyone else who can help) **** If the

A student wants to know why if the odds in favor of an event are 3:4, the probability of the event occurring is not 3/4 How do you respond?

43. ## physics

A copper telephone wire has essentially no sag between poles 30 m apart on a winter day when the temperature is −16◦C. How much longer is the wire on a summer day when the temperature is 26 ◦C? Assume that the thermal coefficient of copper is

44. ## Physics

A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is the change in kinetic

45. ## Anatatomy and Physiology

The ability of a specific tissue or organ to respond to the presence of a hormone is dependent on:

46. ## Exponential Modeling

A species of frog’s population grows 24% every year. Suppose 100 frogs are released into a pond. How many frogs will there be in 5 years?

47. ## Calculus

Use linear approximation, i.e. the tangent line, to approximate (1/0.504) as follows: Find the equation of the tangent line to f(x)=1/x at a "nice" point near 0.504. Then use this to approximate (1/0.504).

48. ## statistics

In a preliminary study, the sample standard deviation for the duration of a particular back pain suffered by patients was 18.0 months. How large a random sample is needed to construct a 90% confidence interval so that an estimate can be made within 2

49. ## Physics

A 100-Watt light bulb plugged into a 120-Volt outlet is left on for 60 seconds. How much energy (in Joules) is used up by the bulb during this time?

50. ## Math

Suppose that the weather forecast calls for a 30% chance of rain on each of the three days of a long weekend. What are the odds in favour of no rain throughout the entire long weekend? Claudia and Ally are the two favourites to win an upcoming golf

51. ## Ollu

On a steamy mirror wipe away just enough to see your full face. How tall will the wiped are be compared with the vertical dimension of your face?

52. ## Programming

The raptor program displays the grade for each test score and the average of all four test scores. Use a loop to input four test scores. Validate the input. The test scores must be between 0 and 100.

53. ## Math

Show that the curve with parametric equations x=tcost, y=tsint, z=t lies on the cone z^2=x^2+y^2

54. ## Trig 2

What is the smallest value for x where y = sin 2x reaches its maximum ...wtf that means.

55. ## Chem

500.0 Ml of 0.160 M NaOH is added to 565 ml of 0.250 M weak acid. Ka=2.46x10^-5. What is the pH of the resulting buffer

56. ## Differential Equations

A tank originally contains 5 lb of salt dissolved in 200 gal of water: Starting at time t=0, a salt solution containing 0.10 lb/gal is to be pumped into the tank at a constant rate and the well-stirred mixture is to flow out of the tank at the same rate.

57. ## Mathematics

The mass of Aravin to the mass of Bob is in the ratio 17 : 13. If the difference in their masses is 12 kg, find their combined mass.

58. ## physics

A wheel of diameter 28.0 cm is constrained to rotate in the xy plane, about the z axis, which passes through its center. A force = (-38.0 + 39.0 ) N acts at a point on the edge of the wheel that lies exactly on the x axis at a particular instant. What is

59. ## physics

A child lifts a 5.0-newton toy to a height of 0.50 meters. How much work is done on the toy?

60. ## geometry

in the diagram below of triangle abc, de is a midsegment of triangle abc, de=7, ab=10, and bc=13.find the perimeter

61. ## Math

2 apples weigh the same as a banana and a cherry.A banana weighs the same as nine cherries.How many cherries weigh the same as one apple

62. ## statistics

The number of defects in a random sample of 200 parts produced by a machine is binomially distributed with p = .03. Based on this information, the expected number of defects in the sample is 6. Is it True or False?

63. ## accounting

What would you pay for a $50,000 debenture bond that matures in 15 years and pays$5,000 a year in interest if you wanted to earn a yield of: (Round computations to 2 decimal places and use the rounded amounts to calculate the final answer. Round the final

64. ## AP Chemistry

Which action(s) will decrease the equilibrium concentration of a non-reacting gas in water? 1. decreasing the temp. of the water 2. decreasing the volume of water 3. decreasing the pressure of the gas above the liquid a. 1 only b. 2 only c. 3 only d. 1 and

65. ## I don't understand

If it is 143 miles from New York to Albany, 147 from Albany to Syracuse and 80 miles from Syracuse to Rochester, how far is it from New York to Rochester? This question assumes you are travelling along Interstates I-97 and I-90, north along the Hudson to

66. ## Spanish 1 b

please check my answers 2. How do you say one must in Spanish A. Hay que * B. A menudo C. Que más D. Es necesario 5. A person of mixed European and indigenous heritage is commonly to as a____ A. Mixtec B. Mestizo* C. Maya D. Nahuatl 6. Which is not a

67. ## Math

Jennifer rode her bike to the store at a rate of 15 mph. She rode back home at a rate of 10 mph. How far is it to the store if the round trip takes an hour?

68. ## PHYSICS

Determine the resulting temperature when 1kg of ice at 0 Degree celcius is mixed with 9kg of water.

69. ## Physics

A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?

70. ## Physics

A lizard of mass 3.0 g is warming itself in the bright sunlight. It casts a shadow of 1.6 cm^2 on a piece of paper help perpendicularly to the Sun’s rays. The intensity of sunlight at the Earth is 1.4 x 10^3 W/m^2, but only half of this energy penetrates

71. ## math

it is a 6 digit number. there is no repetition of digits. It is divisible by 5 and is more than 3000,000. The digit in the hundreds place is 3 more than the digit in the ones place. The digit in the ten thousands place is 3 times the digit in the hundred

72. ## Calculus

On a certain clock the minute hand is 4 inches long and the hour hand is 3 inches long. How fast is the distance between the tips of the hands changing at 4 pm?

73. ## chemistry

A 25.0 mL sample of 0.100 M pyridine (Kb for pyridine is 1.7 ✕ 10-9) is titrated with 0.100 M HCl solution. Calculate the pH after the addition of the following amounts of HCl with sig figs. a) 24.5 mL b) 25.0 mL c) 26.0 mL d) 28.0 mL e) 30.0 mL

74. ## math

The Davidson family wants to expand its rectangular patio, which currently measures 15 ft by 12 ft. They want to extend the length and width the same amount to increase the total area of the patio by 160 ft2. Which quadratic equation best models the

75. ## Math

Let $f(x) = \dfrac{2-3x}{5-2x}$. For what value of $a$ is $f(a) = 3$? Thanks!

76. ## Math

An object is launched at 9.8 meters per second from a 73.5-meter tall platform. The object's height s (in meters) after t seconds is given by the equation s(t)= -4.9t(-4.9t) - 9.8t = 73.5. When does the object strike the ground? I can't figure out how to

77. ## algebra

Find the equation of a horizontal line that goes through the point (5, -3). Explain your answer

78. ## math

If each edge of a cube is increased by 2 inches, the A. volume is increased by 8 cubic inches B. area of each face is increased by 4 square inches D. sum of the edges is increased by 24 inches

79. ## math

from a standard 52 card deck, how many 7 card hands have exactly 5 spades and 2 hearts?

80. ## Physics

A mass is oscillating with amplitude A at the end of a spring. How far (in terms of A) is this mass from the equilibrium position of the spring when the elastic potential energy equals the kinetic energy?

81. ## Physics

A satellite used in a cellular telephone network has a mass of 2160 kg and is in a circular orbit at a height of 670 km above the surface of the earth. What is the gravitational force Fgrav on the satellite? Take the gravitational constant to be =

82. ## Mathematics

OPQRS is a right pyramid whose base is a square of sides 12cm each. Given that the slant height of the pyramid is 15cm. Find the height of the pyramid, the volume of the pyramid, and the total surface area of the pyramid by first drawing the net of the

83. ## math

If you triple 4 and subtract 2 each day, how many days until you have zero?

84. ## REBUS PUZZLES

I need help with some rebus puzzles please. T H R O U G H The letters TRUH are in Bold color. E OV RRAT D E

85. ## Chemistry

The solubility of calcium sulfate at 30 degrees C is .209 g/100mL solution. Calculate its Ksp i calculated it and got 1.5 x 10 ^-2 but the program said that it was wrong if you could help explain how to do it i would appreciate it

86. ## science

What is the molarity of CH3COOH in vinegar containing 4.0% CH3COOH by mass and having a density of 1.02 g/ml?

87. ## Chemistry

The rotten smell of a decaying animal carcass is partially due to a nitrogen-containing compound called putrescine. Elemental analysis of putrescine indicates that it consists of: C, 54.50%, H, 13.73%, and N, 31.77%. Calculate the empirical formula of

88. ## geography

Conflict between North Korea and South Korea was caused by a difference in _____.

89. ## Math

In a study of 800 men,diastolic blood pressure was found to be approximately normally distributed, with a mean of 84 millimeters (mm) of mercury and standard deviation of 10 millimeters. Use the 68-95-99.7% rule to determine what percentage of the test

90. ## Math

Convert ( 4, -pi/6) from polar coordinates to rectangular coordinates. I got sqrt 12, -2 as my answer but it said this was wrong. I checked multiple times and I don't see where I messed up

91. ## Algebra

What is the ninth term of the arithmetic sequence defined by the rule A(n)=-14+(n-1)(2) A)232 B)230 C)2 D)4 Thanks

92. ## Algebra 1

For the 2 functions, f(x) and g(x), tables of values are shown below. What is the value of g(f(3))? x f(x) x g(x) ------- --------- -5 7 -2 3 -2 -5 1 -1 1 3 2 -3 3 2 3 -5

93. ## math

One weekend, there were 95 pizzas ordered for the sophomore dorm. That weekend 19 customers ordered their pizza with just pepperoni, 17 customers ordered their pizza with just sausage, 18 ordered theirs with just onions, 15 ordered theirs with pepperoni

94. ## Statistics

WEB CALCULATOR EXERCISE Descriptive Statistics 1 The table below presents data for a sample of people who completed a religious survey. Age Gender Denomination Church Attendance 56 1 7 4 46 2 6 5 49 2 6 5 49 1 1 5 27 2 9 5 51 1 4 2 47 2 2 3 67 1 5 4 49 2 2

95. ## Physics/electricity

Eighteen-gauge wire has a diameter of 1.024 mm. Calculate the resistance of 19 m of 18 gauge lead wire at 20°C.

96. ## Physics

A 4 kg block rests between the floor and a 3 kg block. The 3 kg block is tied to a wall by a horizontal rope. If the coefficient of static friction is 0.800 between each pair of surfaces in contact, what force must be applied horizontally to the 4 kg block

97. ## Algebra II

If y varies jointly as w and x, and y is 483 when x is 742 and w is 383, find y when x is 274 and w is 756.

98. ## Statistics

In a population of 240 women,the heights of the women are normally distributed with a mean of 64.2 inches and a standard deviation of 3.2 inches. If 36 women are selected at random, find the mean mu x and stand deviation sigma x of the population of sample