Monday
April 21, 2014

Posts by alex


Total # Posts: 2,500

Physics
A car is moving with a velocity of 16 m/s when the brakes are applied and the wheels lock (stop spinning). The car then slides to a stop in 37 m. Find the coefficient of kinetic friction between the tires and the road.

Physics
A person is pushing on a refrigerator that sits on a level floor. Use Newton's third law along with his second law to find the magnitude of the acceleration of a man as he pushes the refrigerator. Assume the man has a mass of 62 kg, he exerts a force of 128 N, the refriger...

algebra
Grace runs 3 miles per day. Find this rate in feet per day

Chemistry - please help!
thank you!

Chemistry - please help!
The decomposition of KClO3 produces oxygen gas and solid KCl. What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133 Celsius and .88 atm? I know I need to use PV=nRT but I can't figure out how.

math
A 20 feet vertical pole cast a shadow of 32 feet. What is the angle of elevation of the sun?

Algebra 2
Simplify (3^−2 − 2^−2)^−1 The answer is -36/5 I just need to know how to do it.

Algebra 2
What are the x-intercepts of the circle with center (0, −2) and radius 3?

Algebra 2
A baseball player swings and hits a pop fly straight up in the air to the catcher. The height of the baseball in meters t seconds after it is hit is given by a quadratic function h(t) = −5t^2 + 10t + 1. What is the maximum height of the baseball?

Algebra 2
How much of a 60% orange juice drink must be mixed with 30 gallons of a 10% orange juice drink to obtain a mixture that is 50% orange juice.

consuer math
Question 1: The cost of joining a gym is $195 plus $50 per month. Rewrite the equation to express cost as a function of time, identify the slope and the y-intercept.

consumer math
The cost of joining a gym is $195 plus $50 per month. Rewrite the equation to express cost as a function of time, identify the slope and the y-intercept.

math
Tommy has right rectangular prism with base length 5 and a cylinder with radius 2.5. If both objects have equal surface areas, what is : a)the height of the right rectangular prism? b) the height of the cylinder? Use Pi =3.14

history
one of president nixons goals was to reduce the number of nuclear weapons the united states had

Physics
A 1.55 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 16.5 cm. (a) Find the total mechanical energy of the system. (b) Find the maximum speed of the mass.

Physics
.819 s

Physics
A uniform rectangular sign of width 47.6 cm, height 25.0 cm, and negligible thickness hangs vertically from supporting hinges attached at its upper edge. Find the period of small-amplitude oscillations of the sign.

Physics
A uniform rectangular sign of width 47.6 cm, height 25.0 cm, and negligible thickness hangs vertically from supporting hinges attached at its upper edge. Find the period of small-amplitude oscillations of the sign.

Physics
Find the length of a simple pendulum that completes 17.0 oscillations in 35.0 s.

Physics
A 1.55 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 16.5 cm. Find the total mechanical energy of the system Find the maximum speed of the mass

Physics
A 1.55 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 16.5 cm. Find the total mechanical energy of the system Find the maximum speed of the mass

Physics
Radio waves are electromagnetic waves that travel at a speed of 3.00 108 m/s, the speed of light. An AM radio station has an assigned frequency of 1350 kHz, which means that the radio waves broadcast by the station are at this frequency. Find the wavelength of these radio waves.

Physics
The free-fall acceleration at the surface of planet 1 is 18 m/s^2. The radius and the mass of planet 2 are twice those of planet 1. What is the free-fall acceleration on planet 2?

Trig
Dalco manufacturing estimate that its weakly profit, P, in hundreds of dollars,can be approximated by the formula P= -4x²+8x+7, where x is the number of units produced per week, in thousands. 1)How many units should the company produce per week to earn maximum profit 2)Fi...

Physics
A certain radio station broadcasts at 1430 kilohertz. This is the frequency of oscillation of electrons in the transmitting antenna producing the radio wave. Find the period of the electrons' motion.

Social Studies
Why were Hoosiers divided over the issues of slavery and loyalty before the Civil War?

calculus
Two consecutive days of the week experience a maximum temperature of 90 degrees F at 1:00pm and a minimum temperature of 44 degrees F at 1:00am. Write a cosine equation measured in house that would model this behavior. Let x=0 represent 1:00pm on the first day.

Physics
James Joule once attempted to measure the increase in temperature of the water in a waterfall resulting from its decrease in gravitational potential energy. How high would the waterfall have to be for the temperature at the bottom to be 1°C higher than at the top?

Physics
James Joule once attempted to measure the increase in temperature of the water in a waterfall resulting from its decrease in gravitational potential energy. How high would the waterfall have to be for the temperature at the bottom to be 1°C higher than at the top?

Physics
How much heat is required to raise by 10.30°C the temperature of 1.2 kg of water? How much heat is required to raise by 10.30°C the temperature of 1.2 kg of iron?

Physics
A car of mass 1.25 103 kg is initially moving on a level road at a speed of 17.0 m/s. Compute the increase in temperature of the brakes, assuming that all the mechanical energy ends up as internal energy in the brake system. Assume a total heat capacity of 10,000 J/C°.

physics
Ice of mass 11.0 kg at 0.00° C is placed in an ice chest. The ice chest has 3.00 cm thick walls of thermal conductivity 1.00 10-5 kcal/s · m · C° and a surface area of 1.25 m2. (a) How much heat must be absorbed by the ice before it melts? (b) If the oute...

Calculus
Find the area of the indicated region. We suggest you graph the curves to check whether one is above the other or whether they cross, and that you use technology to check your answer. (Round your answer to four significant digits.) HINT [See Quick Example page 532.] Enclosed b...

Investment
f you invest $25,000 at 8% interest compounded continuously, what is the average amount in your account over one year?

Calculus
Find the area of the indicated region. We suggest you graph the curves to check whether one is above the other or whether they cross, and that you use technology to check your answer. Between y = −x and y = x/2 for x in [0, 6]

Physics
What is the speed of a wave whose frequency is 9.00Hz and wavelength is 0.654m?

social studies
how did geography affect europeans in latin america?

Calculus grade 12
a)3cos*2x

Chemistry
The pressure of an unknown gas is measured with a manometer. Instead of mercury the manometer is filled with a liquid (X) whose density is 0.553 g/cc. The pressure is measured as 653 mmX. What is the pressure in mmHg?

s.s help
Growing there own if i was ona farm id wanna grow my own way much cheaper

math
if you tossed two number cubes, what sum has the greatest probability of occuring? Explain.

Chemistry
Given 3.90mL of 1.80M HCl diluted to .520L, whats the pH?

Chemistry
Given 3.90mL of 1.80M HCl diluted to .520L, whats the pH?

math
A basketball team needs 5 players. The team can choose from a group of 7 players. Explain how to find the number of combinations of players that can be on the team.

Human resources
Role Play In this mock executive team meeting, you will assume the role and responsibility for a specific function (for example, human resources, marketing, finance, legal, and operations). The team will be given a scenario in which strategic decisions are to be made for rapid...

Chemistry
How much ice in grams would have to melt to lower the temperature of 58.2 g of water from 55.0 degrees C to 0 degrees C? Assume the density of water is 1.0 g/mL Any advice on how to tackle this problem would be appreciated. Thanks

statistics
how do you find the quartile Q3 of the list of 24 sorted values: 30,33,35,38,40,46,46,47,47,49,50,51,53,53,54,56,60,65,73,74,77,78. what is the formuala and how do you work it?

chemistry
If you add 5.0 mL of 0.50 M HCl solution to 20.0 mL to Buffer C, what is the pH of the buffer? (where buffer C is 8.203 g sodium acetate with 100.0 mL of 1.0 M acetic acid)

Physics
A girl of mass 55 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with the same speed. The ball is in contact with the wall 0.05 s. What is the average force exerted on the wall by the ball? A) ...

Biology
do all specific proteins have the same function in different living organisms?

chemistry
given the equilibrium constant for the following reaction at 500 K, 2 NO (g) + O2 (g) <==> 2 NO2 (g) Kc = 6.2x10^5 calculate the equilibrium constant for the reaction expressed as partial pressures, Kp. the answer is 1.51x10^4. How do i get this?

chemistry
Why do the concentrations of Pb 2+ and SO4 2- ions in a saturated solution of PbSO4 in contact with solid PbSO4 remain the same when the solution evaporates to half of its original volume? it has to do with equilibrium.

chemistry
For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the temperature is increased. PCl5 (g) <==> PCl3 (g) + Cl2 (g) a) what is the sign of delta S for the reaction? Provide a legitimate rationale for the corre...

ap chemistry
When 50.0 mL of a 0.010 M CuNO3 solution is mixed with 150.0 mL of a 0.010 M NaCl solution, a precipitate forms (Ksp = 1.9 x 10^-7). a) Determine all final ion concentrations b) Determine the mass of the precipitate formed. How do i do this?

Math
Suppose that 600 meters of fencing are used to enclose a corral in the shape of a rectangle on three sides, and then a semicircle on the fourth side (The diameter of the semicircle is equal to the width of the rectangle). Find the dimensions of the corral with maximum area.

math
Sorry. n=3/2 or 1.5

math
n= 2/3

math
2/3 x n = 4/9

Physics
An indestructible bullet 1.85 cm long is fired straight through a board that is 11.5 cm thick. The bullet strikes the board with a speed of 400 m/s and emerges with a speed of 285 m/s. (a) What is the average acceleration of the bullet as it passes through the board? Give your...

Physics
Find the angular velocity of a clock's second hand and the linear speed and linear acceleration of a point on the second hand 1.96 cm from the rotation axis.

Physics
Find the angular velocity of a clock's second hand and the linear speed and linear acceleration of a point on the second hand 1.96 cm from the rotation axis.

math
1/2 x 2/3

Physics
2700

Integrals/Related Rates(?)/Volume
Fluid is flowing in a tube that has a radius of 3 centimeters. Water is flowing through a circular cross section at a rate of (9-r^2) cm/s, where r is the distance from the center of the cross section. What is the total amount of water that flows through the cross section in 4...

Math
First, make sure to convert all of your units to meters. Then, sum the sides (so 2*1.4*1.5, two because there are two of the same side, and then do the same for the other two types of sides.

Chemistry
the reaction 2 NO + O2 <=> 2 NO2 (delta H = -114.2 kJ) has a Kc=7.00 x 10^7 at 200 degrees Celsius. what is the value of Kc at 400 degrees celsius? a. 1.25x10^4 b. 1.68x10^8 c.3.91x10^11 d. 5.74x10^22 e. answer not given

Chemistry
what is the solubility in mol/L of insoluble Ca3(PO4)2 (Ksp=1.00x10^-26)in a solution containing .00100 M Na3PO4? a. 2.15x10^-7 b. 7.18x10^-8 c. 7.18x10^-9 d. 1.00x10^-23 e. answer not given

humanities
for my homework my teacher has set me whats the meaning of a human honey pot and i cant find any good websites so i was wondering if you new any

Physics
If a lever is 6 feet long and the fulcrum is six inches from a 500 N boulder, how many newtons of force would be needed to life the boulder?

Physics
Suppose that a 14-m tall platform has a ramp that is 98 m long. If a box needs 245 N of force of lift it, how many N of force is required to push it up the ramp?

Algebra 1
Factor completely 4x^3+x^2y-36x-9y

geometry
Thank You!! Is there any way you can explain a little bit to me how this answer is found? Thank You soo much for your help it is very greatly appreaciated!!

geometry
Robert is making a scale drawing of a painting that is 48in. wide by 120in. high. His paper is 12in. wide and 24in. tall. He decides to use the scale 1in.= 4in. Is this a reasonable scale?

3rd grade math
What is the difference between the perimeter and the area of a polygon?

Chemistry
Assume you begin with 60 g of water at 20 oC and 60 g of water at 80 oC. After adding the two portions of water into your calorimeter, you determine the temperature of the mixed portions of water to be 45 oC. What is the heat capacity of the calorimeter?

organic chemistry
How many steric interactions are there in CIS-1,3-dimethylcyclohexane? Which groups participate in the interactions and whats the total number of interactions of this type??? Also, if i have the steric strain value for one 1,3 H-CH3 interaction, how can i determine the magnitu...

Chemistry
Given the data below, calculate the total heat (in J) needed to convert 20.0 g of liquid ethanol (C2H5OH) at 40.0 oC to gaseous ethanol at 125 oC. A. 3.23 x 103 B. 3.67 x 103 C. 4.17 x 103 D. 2.08x104 E. 2.12 x 104

AP Chemistry
Calculate the pH of each of the following buffered solutions: a. 0.10M C2H5NH2/0.25M C2H5NH3Cl b. 0.25M C2H5NH2/0.50M C2H5NH3Cl c. 0.50M C2H5NH2/0.50M C2H5NH3Cl

chemistry
Liquid nitrogen-powered car students at the university of north Texas and the university of Washington built a car propelled by compressed nitrogen gas. The gas was obtained by boiling liquid nitrogen stored in a 185.0 L tank what volume of N2 is released at 0.900 atm or press...

biology
Question 18 If a child was allergic to a substance scratched onto their skin, the area turned red and swollen within about 10 minutes. Which of the following would cause these symptoms? Answer Release of interleukin-10 Recruitment of B cells Release of histamine The presence o...

biology
If a child was allergic to a substance scratched onto their skin, the area turned red and swollen within about 10 minutes. Which of the following would cause these symptoms? Answer Release of interleukin-10 Recruitment of B cells Release of histamine The presence of flatworms...

biology
If a child was allergic to a substance scratched onto their skin, the area turned red and swollen within about 10 minutes. Which of the following would cause these symptoms?

astronomy
What is the tempertaure range for objects whose wavelength at maximum falls within the visible spectrum, 400 to 700 nm?

allterations
Senteces for allterations

math
Carl have a budget of $290. Explain how you would find amount Carl spent on books.

physics
A cyclist enters a curve of 30 m radius at a speed of 12 m s-1. He applies the brakes and decreases his speed at a constant rate of 0.5 m s-2. Calculate the cyclist’s centripetal (radial) [3 marks] and tangential [15 marks] accelerations when he is travelling at a speed o...

physics
During a throw an athlete exerts a net average torque of 100 Nm on a discus about its axis of spin. The mass of the discus is 2 kg and its radius of gyration about its spin axis is 12 cm. If the discus was not spinning at the beginning of the throw and the throwing action last...

physics
An athlete is supporting a weight of 200N in his hand with his forearm at a right angle to his biceps. Assuming his biceps are in the vertical plane, the axis of rotation of the forearm is 3 cm from the elbow and 25 cm from the centre of gravity of the weight, calculate the fo...

physics
A boy of mass 23 kg sits on a seesaw 1.5 m from the axis of rotation. At what distance from the axis of rotation must his friend, whose mass is 21 kg, be positioned to balance the seesaw? [6 marks]

physics
As part of a training schedule a weightlifter pushes a heavy metal block along the floor. The lifter applies a force of 850 N downwards on the block at an angle of 65° to the vertical (25° to the horizontal). The weightlifter pushes the block forwards 4 m in 1.6 s. Cal...

physics
A puck of mass 5.0 kg moving at 16.5 m/s approaches an identical puck that is stationary on frictionless ice. After the collision, the first puck leaves with a speed v1 at 30º to the orginal line of motion. The second puck leaves with speed v2 at 60º. The speed v1 af...

physics
A puck of mass 5.0 kg moving at 16.5 m/s approaches an identical puck that is stationary on frictionless ice. After the collision, the first puck leaves with a speed v1 at 30º to the orginal line of motion. The second puck leaves with speed v2 at 60º. The speed v1 af...

3 grade english
Jimmy likes checkers, and he is very good at playing it with his mom. Pronouns are "he" and "it" They have lots of fun playing it because they spend time together. Pronouns are "They" and "it" Sometimes, Jimmy's dad plays with them, ...

Chem
how much energy is required to change 42.5 g of molten aluminum into aluminum vapor

Living ENvironment
no am doing a project and i have to label the parts of the diagram if they are enzyme/substrate complex , active site and etc

Living ENvironment
Where is the Enzyme/substrate complex

Physics
A computer is reading data from a rotating CD-ROM. At a point that is 0.0368 m from the center of the disk, the centripetal acceleration is 274 m/s2. What is the centripetal acceleration at a point that is 0.0781 m from the center of the disc?

Physics
Two satellites are in circular orbits around Jupiter. One, with orbital radius r, makes one revolution every 18 h. The other satellite has orbital radius 3.9r. How long does the second satellite take to make one revolution around Jupiter?

Chemistry
KI+H2SO4 Write the balanced net ionic equation.

Chemistry
NaBr+H2SO4 Write the balanced net ionic equation.

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