Monday

April 21, 2014

April 21, 2014

Total # Posts: 1,061

**Physics**

A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...

**Physics **

An astronaut of mass 84.0 kg is taking a space walk to work on the International Space Station. Because of a malfunction with the booster rockets on his spacesuit, he finds himself drifting away from the station with a constant speed of 0.570 m/s. With the booster rockets no l...

**Physics**

Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that experienced by...

**physics (clear answer)**

Multiple-Concept Example 10 provides one model for solving this type of problem. Two wheels have the same mass and radius of 5.0 kg and 0.47 m, respectively. One has (a) the shape of a hoop and the other (b) the shape of a solid disk. The wheels start from rest and have a cons...

**physics (clear answer)**

The wheels, axle, and handles of a wheelbarrow weigh W = 56.2 N. The load chamber and its contents weigh WL = 584 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man's hands apply a force to the han...

**physics (clear answer)**

Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 26.1° above the horizontal. One child, with a mass of 43.6 kg, is hanging 1.31 m along the branch from the tree trunk. The other child, with...

**Physics**

A particular garden hose has an inside diameter of 15/16 in. The nozzle opening has a diameter of 5/16 in. When the flow speed of the water in the hose is 0.58 m/s, what is the flow speed through the nozzle?

**Physics**

A spherical hydrogen-filled balloon is used to lift a load of 5950 N (in addition to the weight of the hydrogen). Suppose the density of the air is 1.18 kg/m3. Find the minimum necessary radius for the balloon

**Phyiscs**

A hollow copper tube (diameter = 4.01 cm) is sealed at one end and loaded with lead shot to give a total mass of 0.218 kg. When the tube is floated in pure water, what is the depth, z, of its bottom end?

**Physics**

A 4.8 kg container of water sits on a scale A. A cube of aluminum with sides of length 11.0 cm is suspended from a spring scale B so that half of the block is submerged in the water. What is the reading (in N) on spring scale B The continual question is What is the reading (i...

**chemistry**

calculate the grams of solute neede to prepare 24 grams of a 13.5% by mass scurose (c12h22o11) solution

**math**

Let y=3(x-4)^2 -3 a) Show that y=3x^2 -24x +45 b) For the graph of y find both x intercepts by solving the equation 3x^2 -24x +45 =0 A) direction of opening B) x intercepts C) y intercept D) Axis of Symmetry E) Vertex F) max or min

**Math**

A person travels 8 mi, due north, 3 mi, due west and 7 mi due south how far are they from were they started?

**chem**

Hydrogen iodide can decompose into hydrogen and iodine gases. 2HI(g) mc026-1.jpg H2(g) + I2(g) K for the reaction is 0.016. If 0.148 atm of HI(g) is sealed in a flask, what is the pressure of each gas when equilibrium is established?

**math**

a piece of wire 24 ft. long is cut into two pieces. one piece is made into a circle and the other piece is made into a square. Let the piece of length x be formed into a circle. allow x to equal 0 or 24, so all the wire is used for the square or for the circle. How long should...

**Physic**

The figure below shows a block of mass m resting on a 20¡ã slope. The block has coefficients of friction ¦Ìs = 0.73 and ¦Ìk = 0.53 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging...

**Literature**

thanks

**Literature**

yes

**Literature**

Can someone help me with, the book "Invisible Man" and which character wore the mask.

**science**

Vanadium has several oxidation states. write correct formulas for vanadium oxide and vanadium oxide.

**science**

Vanadium has several oxidation states. write correct formulas for vanadium (iii) oxide and vanadium (v) oxide.

**Statistics**

Suppose x has a distribution with μ = 11 and σ = 5. (a) If a random sample of size n = 45 is drawn, find μx, σ x and P(11 ≤ x ≤ 13). (Round σx to two decimal places and the probability to four decimal places.)

**Chemistry 2**

A solution of NaOH (aq) contains 8.2 grams of NaOH(s) per 100.0 mL of solution. Calcualte Ph and POH at 25 degrees celsiuis

**Chemistry 2**

Calcualte PH and POh of an aqueous solution that is 0.050 M in HCL and 0.085 M in HBr at 25 degrees C

**english literature**

can you help me comment on this theme please. awe and amazement

**Pre Algebra**

I have to create two dice (each on has six sides) they have to be numbered in such a way that the probability of rolling the numbers 1-12 are the same? I know this is a function but I am having trouble.

**physics (clear answer)**

An airplane traveling north at 400 m/s is accelerated due east at a rate of 50 m/s2 for 6 s. If the effects of air resistance and gravity are ignored, what is the final speed of the plane?

**physics (this one is killing me clear answer)**

At time t = 0 s, a puck is sliding on a horizontal table with a velocity 3.60 m/s, 35.0° above the +x axis. As the puck slides, a constant acceleration acts on it that has the following components: ax = –0.360 m/s2 and ay = –0.980 m/s2. What is the velocity of th...

**physics (clear answer)**

A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 16.0 m/s at an angle of 38.5° above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air resistanc...

**geometry**

A cylinder has a height of 16 cm and a radius of 5 cm. A cone has a height of 12 cm and a radius of 4 cm. If the cone is placed inside the cylinder as shown, what is the volume of the air space surrounding the cone inside the cylinder? (Use 3.14 as an approximation of π.)

**Algebra**

Thank you Ms. Sue, that helps a lot!

**Algebra**

A road map has a scale of 5/8 for every 125 miles. How many inches would be needed to represent 1000 miles on the map?

**Physics 221**

An electron is accelerated by a uniform electric field (1000 V/m) pointing vertically upward. Use energy methods to get the magnitude and direction of its velocity after it moves 0.10 cm form rest. Does the electron gain or lose potential energy?

**chemistry**

PV = nRT P = pressue V = volume n = moles R = 8.31 T = Temperature (0c = 273K) (103.0)(26.4) = n(8.31)(283) 2719.2 = n(2351.73) 2719.2 / 2351.73 = n m = 1.16

**Health (Ms. Sue)**

Good.

**Reading**

the wrong word is on. it is supposed to be in. you`re welcome.

**electromagnets**

A current loop with radius 20 cm and current 2 A is in a uniform magnetic field of 0.5 T. Considering all possible orientations of the loop relative to the field, what is the largest potential energy difference (in Joules) you can find between two orientations?

**electricity and magnetism**

A current of 20 mA flows in a single circular loop with a radius of 2 meters. A uniform magnetic field of 1.2 T points parallel to the plane of the loop. What is the magnitude of the magnetic moment of the loop in A-m^2? What is the magnitude of the torque on the loop in N-m?

**literature**

I have one more confusing question regarding this. And Thank you Ms.Sue for answering the last question! Franklin's humor in Witch Trial at Mt. Holly depends upon the belief that... a)the belief that religion takes precedence over science b)the belief that the physical law...

**literature (bejamin Franklin)**

I have one more confusing question regarding this. And Thank you Ms.Sue for answering the last question! Franklin's humor in Witch Trial at Mt. Holly depends upon the belief that... a)the belief that religion takes precedence over science b)the belief that the physical law...

**literature (bejamin Franklin)**

As a poor boy, Franklin realized that he could not buy many books, but he came up with an idea that could give people access to as many books as they wanted. This idea was essentially.. a) get a government grant b)get the government to buy the books c)have all your friends eac...

**Math**

An irrigation pump can pump 250 liters of water per minute. How many hours should the system work to water a rectangular ﬁeld 75 m by 135 m to a depth of 3 cm?

**pre cal**

ah i forgot to clarify the 1/2L is being multiplied by the squareroot of T/u

**pre cal**

How do I express this relationship in a language of variation? I know how to do basic ones but this one is really advanced looking. f=1/2L squarert T/u

**History (black death)**

Which best describes the right answer to: The Black Death first came to Europe- a) through sailors in Italian ports. or b) through merchants trading in France. I know that it was spread through ship. But the wordings that she put is so confusing....

**History**

Is dark ages same as early middle ages???

**History**

Which do you think best describes the word Feudalism?? a system designed to increase the power of lords rather than vassals or a reciprocal personal economic and political relationship between lords, vassals and peasants

**Math**

Find the points of intersection of the parabolas y=1/2x^2 and y=1-1/2x^2. Show that at each of these points the tangent lines to the two parabolas are similar Answer (+-1,1/2) Please show and explain all steps thank yo

**literature**

In "How the World Began" what we now consider the North American continent, Native Americans saw as Answer a-turtle's back b-a pancake c-a great American desert d-the Land of Oz In "How the World Began," Iagetci's fall from the upper world is fortun...

**Chem**

I have done this so many way and can't seen to get the right answer please help! I'm looking for the Concentration of NiCl2, M from the following Volume of 0.390 M NiCl2, mL 4.0 3.0 2.0 1.0 Volume of water, mL, 0 1.0 2.0 3.0 Absorbance 0.858 0.644 0.429 0.215 I keep ge...

**Science - Physics, I need help with both please. **

A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. What was the average force of air resistance (e.g., friction) acting on the diver? Bonus: What is the force of friction underwater if she reaches a depth of 2.5 m bef...

**Math**

the average american drinks 29 more cokes per year than the average mexican. if together they consume 555 cokes per year how many cokes are consumed each year by the average american and how many by the average mexican? i also have to identify the constraints.

**biology**

what is one example of a specific case used by scientists for organ cloning?? (therapeutic cloning)

**help...**

Identify the facilities and amenities of disney cruise lines.

**physics**

A 2.0 micro Farad capacitor in a circuit in series with a resistance of 1.0 mega ohms is charged with a 6.0v battery. How long would it take to chage the capacitor to three fourths of its maximum voltage.

**physics**

Show that the time for the voltage in the RC circuit to rise to (Vo/2) "half-max" is t1/2 = T ln 2

**physics**

With V = Voe^-(t/T), how many time constants does it take for a capacitor to discharge less than 1% of its initial voltage?

**physics**

What is the voltage across a capacitor after a time of two constants when a. charging from zero voltage and b. discharging from a fully charged condition?

**physics**

Show that the magnitude of the charge on a capacitor is given by Q = (Qo(1-e^-(t/T))) and Q = Qoe^-(t/T) for charging and discharging, respectively.

**math**

Find the inverse of each of these functions a)f(x)=x/x+2 b)f(x)=2x/5-x c)f(x)=3x/2x+1

**quantum physics**

Help please!!!

**Marine Pollution**

Why there is a need for reception facities for ship operation inside the 50 called special areas?

**algebra 2**

find the value or expression f(x)= x^2, g(x)=x-3 if (f*g)(c)

**Quantum Physics**

Time is running out for you. No money means no score sufficient to get the certificate.

**Quantum Physics**

So, are you ready to transfer them to my personal account at the Bank of Nigeria ?

**Quantum Physics**

For $1000, I'd give you the right answer.

**Quantum Physics**

OK, here is the real answer: theta = e*a*t phi = s*H*i*t Job done!

**Quantum Physics**

For 8d. Theta = pi Phi = 0

**Chemistry**

If 5.300 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water? 2C6H6(l) +15O2 (g)----> 12CO2(g)+6H2O(l) +6542

**American History**

informal changes to the constitution include. A.Treaties B.Laws passed in congress C. Supreme court decisions D. All of the above

**Physics**

A car accelerates uniformly from rest to a speed of 23.9 km/h in 8.2 s. Find the distance it travels during this time. Answer in units of m

**Algebra 1**

A rectangle has a length of 4x and a width of 4x-2. its perimeter is 12 inches find the length and width

**Math**

yes

**Physics **

A plane is flying horizontally at a speed of 290m/s. He drops a package (ignoring air resistance). A)If it take 15s for the package to hit the ground, how high above is the plane? B) How far (horizontally) before the island should Steven drop the package? C) Assuming the airpl...

**Mechanics**

Typically, a tennis ball hit during a serve travels away at about 51 m/s. If the ball is at rest mid-air when struck, and it has a mass of 0.058 kg, what is the change in its momentum on leaving the racket? Show the solution and answer.

**Mechanics**

A 1000-kg car whose motor delivers a maximum power of 40.0 hp to its wheel can maintain a steady speed of 130 km/h on a horizontal roadway. How large is the friction force that impedes its motion at this speed? Show the solution and answer

**algebra b**

the cumulative number of car accidents from 2000-2010 can be modeled by the quadratic expression, C=-33x^2+792x+8,877, where x=1corresponds to 2000, x=2 corresponds to 2001, and so on untill x=11 corresponds to 2010 a)find the number of cumulative car accidents in 2005? b)use ...

**algebra b**

the height h in feet of a ball after t seconds is given by h=176t-16t^2. how long did it take to hit the ground

**algebra b**

I'm sorry sue the area is 84 square feet

**algebra b**

the length of a rectangular banner is 5 feet longer than the width. If the width is 84 square feet, find the dimensions

**Mechanics**

a driver of a 1200-kg car notices that the car slows from 20 m/s to 15 m/s as it coasts a distance of 130 m along level ground. How large a force opposes the motion? Show the solution

**Physics**

An AC voltage with 169 peak volts is applied across a 506 ohm resistor. To the nearest tenth of a watt, what is the average power?

**physics**

You are on an archaeological dig and discover a strange artifact. It is a utensil that appears to be carved out of an elephant's tusk You analyze it and discover that it has 0.625 the amount of carbon-14 you would find in a living specimen. 1.How many half-lives has the sp...

**math**

13/28 x 100% =46.4%(corr. to 3 sig. fig.) (we usually correct to 3 significant figure if we see long decimals)

**Math**

I assume you and your friends share the pizza equally and no other people are going to share the pizza. Each one will get = 3 1/8 divided by 5 = 5/8

**physics**

Charge A has a charge of +2C. Charge B has a charge of -3C and is located 1 meter to the right of A. Charge C is located 1 meter to the right of Charge B and has a charge of -1C. If a fourth charge (Charge D) is placed 4 meters to the right of Charge B, how much charge must it...

**Introduction to Physical Science**

When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)

**physics**

An iorn rod (a=11.8 x 10^-6 C^-1) has a length of 1000 meters(or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?

**Physics**

An iorn rod (a=11.8 x 10^-6C^-1) has a length of 1000 meters(or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?

**Physics**

thanks simon76 :)

**Physics**

Anyone have any idea for q2_2_1 Q2_2_3 Q2_2_5 Appreciate your help. Thanks :)

**Physics**

2_1_3 is wrong

**Physics**

Q2_2_5 is incorrect

**Physics**

A boat is constructed in the shape of a rectangular cube. The base of the boat is 2m by 3m and the side of the boat is 2m high. The boat has a total mass of 4500kg. Hint-The density of the water is 1000kg/m^3. a. What is the buoyant force on the boat? Explain answer. b. Calcul...

**Physics**

A ball is rolled off a table that is 0.481 m above the floor. The ball is rolling with a velocity if 1.8 m/s as it goes off the edge of the table. At the exact instant the first ball rolls off the table a second ball is dropped from the same height. A.) How long does it take e...

**physics**

an automobile is travelling towards you at a speed 25.0m/s. When you measure the frequency of its horn, you obtain a value of 26Hz. If the actual frequency of the horn is known to be 240Hz, calculate speed of sound in air? answer is 325m/s

**Physics**

￼

**Physics**

The femur of a human leg (mass 10 kg, length 0.9 m) is in traction, as shown in the figure below. The center of gravity of the leg is one-third of the distance from the pelvis to the bottom of the foot. Two objects, with masses m1 and m2, are hung using pulleys to provide upwa...

**Physics**

49, 24

**physics**

If a cyclist traveling at 14.0m/s skids to a stop in 5.60 s, determine the skidding distance assume uniform acceleration? Answer is 39.2m

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