Posts by Joe
Total # Posts: 2,750

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 to make it move? 
Math
78.50 
Math
it doed say to the tenths 
Math
80 
Math
6.753=7.000 78.456=80.00 
Math
6.750 78.46 
Math
round to the given place 6.64 (tenths) 2.435 (hundredths) 6.753 (ones) 78.456 (tenths) 
math
how do I do long division 
Math
Thank you both 
Math
Ok. My answer was 105mins But converted to 1hr & 45 mins. Thanks! 
Math
That's what I got & my teacher marked it wrong. Is that 1hr & 45 mins 
Math
Meredith took 15 minutes to unpack 4 boxes of books. If she unpacked a total of 28 boxes, how long did it take her to unpack all the boxes? 
math
This is completely incorrect. This is assuming that the price of one television equals the price of one dvd. Since it tells you that one television equals two dvds, you substitute in 4 dvds for two televisions. So you pretend that there are seven dvds. So the price of one dvd ... 
math
 Three hockey teams, the Crabs, the Eels, and the Seals, played each other once with no shutouts ( every team scored at least 1 goal in each game). A team gets 10 points for a win, 5 point for a tie and one point for each goal scored. If the Crabs received 20 points, the Eels... 
math
 Three hockey teams, the Crabs, the Eels, and the Seals, played each other once with no shutouts ( every team scored at least 1 goal in each game). A team gets 10 points for a win, 5 point for a tie and one point for each goal scored. If the Crabs received 20 points, the Eels... 
sociology
which sociological approach focuses on the macrolevel and would tend to view inequality in gender as central to behavior and organization? 
english 3
The space shuttle was both a marvel and huge. 
Math
Solve 2×2×2×3×7 
accounting
Use your knowledge of income statements to fill in the missing items: Sales Cost of goods sold $575,000 Gross profit $1,600,000 General and administrative expense $200,000 Selling and marketing expense $ Depreciation $50,000 Operating income $ Interest $100,000 Income before ... 
math
113,333.33 
physics
A thin spherical shell of mass 0.450 kg and diameter 0.190 m is filled with alcohol (ρ = 806 kg/m3). It is then released from rest on the bottom of a pool of water. Find the acceleration of the alcohol filled shell as it rises toward the surface of the water. 
physics
A thin spherical shell of mass 0.450 kg and diameter 0.190 m is filled with alcohol (ρ = 806 kg/m3). It is then released from rest on the bottom of a pool of water. Find the acceleration of the alcohol filled shell as it rises toward the surface of the water. 
Fractions
What if u have 71/10 and u have to Chang that in to a mixed number 
Math
Estimate each quotient 766÷8 $31.75÷8 
Chemistry
How many hours are required for the deposition of 15.0 grams of Al from molten AlCl3 by a current of 15.0 amps? 
physics
55 
Chemistry
What is the molar mass of a compound if a gaseous sample has a density of 2.807 g/L at 18 °C and 728 torr? 
Chemistry
Dimethylamine burns in oxygen according to the following equation: 4 C2H7N + 15 O2 → 8 CO2 + 14 H2O + 2 N2 (a) How many liters of O2 at 35 °C and 0.840 atm will be needed to burn 7.70 L of C2H7N at 35 °C and 0.840 atm? (b) How many liters of CO2 at 35 °C and ... 
Math
25 ft/sec 
Physics
A 17kg child slides down a 2.7m high playground slide. She starts from rest, and her speed at the bottom is 1.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants? 
Physics
A car is traveling at 10 m/s. By what factor does the car's kinetic energy increase if its speed is doubled to 20 m/s? 
Physics
An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image. 
Math
A high school volleyball team has 20 members. If there is an equal number of members from each of the 4 grades, how many students from each grade are on the team? 
math
how many minutes are there in 6 hours and 45 minutes 
math
Chances are 5050 that a newborn baby will be a girl. For families with five children, what is the probability that all the children are girls 
statistics
Each of the following is a confidence interval for u = true average(population mean) resonance frequency (Hz) for all tennis rackets of a certain type: (114.4, 115.6) (114.1, 115.9) A) What is the value of the sample mean resonance frequency? B) Both intervals were calculated ... 
statistics
Each of the following is a confidence interval for u = true average(population mean) resonance frequency (Hz) for all tennis rackets of a certain type: (114.4, 115.6) (114.1, 115.9) A) What is the value of the sample mean resonance frequency? B) Both intervals were calculated ... 
statistics
Random samples of size n=10 are taken from a normal population whose statndard deviation is known to be 5. Calculate the area under the sampling distribution curve for x bar between the points u1 and u+1. That is find the probability that the sample mean lies within + or = 1 ... 
statistics
Random samples of size n are selected from a normal population whose standard deviation is know to be 2. Suppose you want 90% of the area under the sampling distribution of x bar to lie within + or  1 unit of a population mean u. Find the minimum sample size n that satisfies ... 
physics
a longitudinal wave with a frequency of 3.0 Hz takes 1.7 s to travel the length of a 2.5m slinky (see figure 16.3). Determine the wavelength of the wave. 
physics
a longitudinal wave with a frequency of 3.0 Hz takes 1.7 s to travel the length of a 2.5m slinky (see figure 16.3). Determine the wavelength of the wave. 
physics
Suppose the sound is emitted uniformly in all directions by a public address system. The intensity at a location 22 m away from the sound source is 3.0 x 104 W/m2. What is the intensity at a spot that is 78 m away? 
physics
light is an electromagnetic wave and travels at a speed of 3.00 x 108 m/s. the human eye is most sensitive to yellowgreen light which has a wavelength of 5.45 x 107 m. what is the frequency of this light? 
physics
at a distance of 3.8 m from a siren, the sound intensity is 3.6 x 102 W/m2. Assuming that the siren radiates sound uniformly in all directions, find the total power radiated. 
physics
the distance between a loudspeaker and the left ear of a listener is 2.70 m a) calculate the time required for sound to travel this distance if the air temperature is 20oC. b) assuming that the sound frequency is 523 Hz, how many wavelengths of sound are contained in this ... 
physics
From a vantage point very close to the track at a stock car race, you hear the sound emitted by a moving car. You detect a frequency that is 0.86 times as small as that emitted by the car when it is stationary. The speed of sound is 343 m/s. what is the speed of the car? 
Physics
5g 
math
a particle starts at time t = 0 and moves along the x  axis so that its position at any time t is greater than or equal to zero is given x(t) = (t1)^3(2t3) A. Find the velocity of the particle at any time t greater than or equal to 0. B. For what values of t is the velocity... 
Math
What is another way to write the expression 44n? 44÷n? 
PreAlgebra
A bag contains 10 white golf balls and 6 striped golf balls. A golfer wants to add 112 golf balls to the bag. He wants the ratio of white to striped golf balls to remain the same. How many of each should he add? 
math
Write four million, four thousand, forty in standard form. 
math
Order the following numbers from greatest to least. 2.071; 20.071; 20.71 Is this right 20.71; 20.071; 2.071 
Math
Without multiply how many decimals places r in the product of 4.97 and 3.456? 
math
Isn't 19 + 21 + 40 which is more than the amount of children in the class? Then you add 10 more that don't play it's 50. So how is the class total 38 as implied? 
math
rene gave each of six people 1/10 of a veggie pizza. rene has 2/5 of the pizza left. explain how this is true 
science
How much total work is done by 450N girl who lifts a 52N backpack 1.2m to her shoulders and then climbs a ladder 3.0m high? 
physics
From the moment a 42 m/s fastball touches the catcher's mitt until its completely stopped takes 0.014 s. Calculate the average acceleration of the ball as it is being caught. 
math
a pizza place sold worth 2000 of pizza on saturday. there were 29 small pizzas sold and medium pizzas sold 
physics
A paperweight weighs 6.9N in air. When it is completely submerged in water it appears to weigh 4.3N. A) What is the volume of the paperweight? B) What is the density paperweight? The density of water is 1000kg/m3. 
physics
A 2000 kg truck is at rest at a stop sign. A 1100kg car collides headon with the truck. The car was moving at 15.0m/s before the collision if the collision was completely inelastic, what is the velocity of the car and the truck after the collision? 
physics
A paperweight weighs 6.9N in air. When it is completely submerged in water it appears to weigh 4.3N. A) What is the volume of the paperweight? B) What is the density paperweight? The density of water is 1000kg/m3. 
physics
A fulcrum is placed under the center of a uniform 4.00m long, 3.00kg board. Child A has a mass of 42 kg. This child sits on the left end of the board; Child B has a mass of 26kg. Child B sits on the right end of the board. Where should child C (mass 21 kg) sit in order to have... 
physics
A paperweight weighs 6.9N in air. When it is completely submerged in water it appears to weigh 4.3N. A) What is the volume of the paperweight? B) What is the density paperweight? The density of water is 1000kg/m3. 
physics
A 2000 kg truck is at rest at a stop sign. A 1100kg car collides headon with the truck. The car was moving at 15.0m/s before the collision if the collision was completely inelastic, what is the velocity of the car and the truck after the collision? 
physics
A uniform, horizontal beam is 5.00m long and has a weight of 200N. The beam is hinged at one end to a wall. A 600N weight is attached to the order end of the beam. The beam is supported by cable at the end opposite the wall. The cable attaches to the wall directly above the ... 
physics
A pendulum has a length of 1.35m. What mass should be placed on a spring with a spring constant of 10.0N/m to have oscillations with the same period as the pendulum. 
physics
A duck is floating on water with 26% of its total volume submerged below the surface. If the duck has a mass of 2.6kg, what is the duck’s total volume? You must show all necessary work, the density of water is 1000kg/m3. 
physics
A 3.0 kg sphere moving to the right at 2.0m/s undergoes an elastic headon collision with a 2.0kg sphere. The 2.0kg sphere is initially at rest. What is the speed of each sphere after the collision? 
math
According to a national study, 45% of american adults have hypertension, 20% have hypotension, and 35% have normal blood pressure. A sample of 150 adults was taken and the following data were collected. Hypertensive: 54, Normal: 69, Hypotensive: 27. Test at the 5% level ... 
7th grade math Ms. Sue please!
Y'all are lifesavers. "I really don't like Math" is right I took the quiz and got a 100%. 
SCIENCE
Identify the primary biological foundations of psychology linked to behavior. 
math
Chelsea left the White House and traveled toward the capital at an average speed of 34 kn/h. Jasmine left at the same time and traveled in the opposite direction with an average speed of 65km/h. Find the number of hours Jasmine needs to travel before they are 59.4 km/hr 
Statistics
In practical use, oral contraceptives have a 5% chance of failing. If a doctor has 10 patients using oral contraceptives, what is the probability that at least 1 will get pregnant? 
Algebra 1
C is more than half of n 
geometry
Determine the measure of angle B of triangle ABC given the following information A= 42 deg c = 12 C = 96 deg 
trigonometry
Determine the area of triangle ABC, given the following information c = 40m b = 20m A = 48deg 
science physics
A rotating wheel requires 4.17 s to rotate through 37 rev. Its angular speed at the end of the 4.17 s interval is 104 rad/s. What is its constant angular acceleration? Assume the angular acceleration has the same sign as the angular velocity. 
math
Question Part Points Submissions Used Verify that the function satisfies the three hypotheses of Rolle's Theorem on the given interval. Then find all numbers c that satisfy the conclusion of Rolle's Theorem. (Enter your answers as a commaseparated list.) f(x) = cos ... 
math x
5(1 – 3m) = 30 – 2(4m + 7) 
world geography
thank u amanda ;) 
world geography
The statement, "People celebrate their birthdays on January 1st" is an example of what type of region? o climate o cultural o physical o political 
world geo
honestly i dnt kno but culture economic physical political is one of the answers 
world geo
The statement, "Paraguay is one of two landlocked South American nations" describes what type of region? o cultural o economic o physical o political 
statistics
what was the answer??? 
Chemistry
I need to find the average molar mass of an unknown element. The atomic mass is 120; the mass numbers of isotopes are 295, 296, 297, 298 and 299; the percent of each isotope is 2.356%, 4.325%, 15.652%, 48.452% and 29.215%. The mass of the neutron is 1.67262164x10^24g and the ... 
Chemistry
I need to find the average molar mass of an unknown element. The atomic mass is 120; the mass numbers of isotopes are 295, 296, 297, 298 and 299; the percent of each isotope is 2.356%, 4.325%, 15.652%, 48.452% and 29.215%. The mass of the neutron is 1.67262164x10^24g and the ... 
math
James is 15 years older than Sue. In 12 years James will twice Sue's age. How old are James and Sue? 
Math
Find the derivatives of the function g(t)= cosh^3 t. 
chemistry
A home swimming pool is disinfected by the daily addition of 0.50 gal (1 gal = 3.785 L) of a "chlorine" solution–NaOCl in NaOH(aq). To maintain the proper acidity in the pool, the NaOH(aq) in the "chlorine" solution must be neutralized. By experiment ... 
Chemistry
the halflife of cobalt60 is 5.20 years.. how many milligrams of a 2.000mg sample remains after 6.55 years 
Math
Come up with an expression for a function f such that the domain of f is all real numbers, lim (f(x) = 3) as x approaches 2 and f(2) = 3. 
Free Fall
The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.9 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? 
Economics
There are two types of consumers of potatoes: 10 are rich and 50 are poor. Every rich consumer has a demand of 0 for a price of $500/ton; and his/her demand decreases by 1 ton each time the price increases by $1/ton. Every poor consumer has a demand of 0 for a price of $280/... 
social sciences
The market supply for potatoes in New York is 2,000 tons for a price of $200 a ton, and 5,000 tons for a price of $500 a ton. Between these two prices market supply is a straight line. What is the equation of the supply curve? 
chem
Which of the following solutions has the highest concentration of Cl ions? 500 mL of 0.10 M NaCl 100 mL of 0.20 M MgCl2 200 mL of 0.10 M FeCl3 400 mL of 0.30 M NH4Cl 200 mL of 0.20 M KCl 
chemistry
NO ITS RIGHT 
chemistry
it said that was wrong 
physics
46.8 
physics
Three vectors are shown in Fig. 332 (A = 60.0 , B = 56.0°). Their magnitudes are given in arbitrary units. Determine the sum of the three vectors. (a) Give the resultant in terms of components. (b) What is the magnitude of the resultant? What is the resultant's angle ... 
physics
i don't get what theta is or arcsin