Friday

February 12, 2016
Total # Posts: 2,153

**Physics and magnets**

A rectangular loop of wire of mass m and resistance R slides on a friction-free horizontal table. There is a region of uniform magnetic field perpendicular to the table. What type of graph best describes the speed v of the loop as a function of time?
*December 18, 2013*

**magnetism**

infinitely long wire carries a current I100A. Below the wire a rod of length L 10cm is forced to move at a constant speed v=5m/s long horizontal conducting rails. The rod and rails form a conducting loop. The rod has resistance of R 0.4ohms. The rails have neglibible ...
*December 17, 2013*

**manetism help!**

A charged particle with charge q is moving with speed v in a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendiculuar to the same magnetic field. The time to complete one full circular revolution for the first particle T1. The time to...
*December 17, 2013*

**magnetic**

A charged particle with charge Q is moving with speed V in a uniform magnetic field. A second identical charged particle is moving with speed 2V perpendiculuar to the same magnetic field. The time to complete one full circular revolution for the first particle is t1 . The time...
*December 17, 2013*

**Quick science question**

In the newspaper one day, you read that the highest tides of the season are expected in the next month. What can you infer about the positions of the Sun, Earth, and the Moon? What phase of the Moon will probably be visible?
*December 16, 2013*

**Civics**

What happened as a result of the so-called Intolerable Acts?
*December 14, 2013*

**Algebra**

-847
*December 13, 2013*

**Math**

A marching band was in a parade. The band members marched in 8 rows. There were 6 band members in each row. Explain how the fact that 5X6=30 can help you find 8X6. I need help with this question
*December 10, 2013*

**math**

Which of the following statements is always true of similar polygons
*December 9, 2013*

**Physics magnetism**

The inductor in the circuit has a resistance of 100 ohms connected to a long solenoid with a loop density of 100 turns per centimeter and 59 H inductance connected to a 12 V battery. When the switch has been closed for a long time, what is the magnetic field magnitude inside ...
*December 7, 2013*

**physics**

The circuit shown below has a 100 Ohm resistor and 50 Volt-sec/amp (a unit of inductance called the Henry) inductor connected to a 12V battery. It is a freshman physics tradition that inductors are very poorly The switch is closed at t = 0 seconds. What is the magnitude of the...
*December 4, 2013*

**physics**

An obnoxious brat assigns his 0.0221-kilogram pet mouse Mickey the role of stunt mouse by stuffing him into a spring gun and shooting him up into the air at some angle. During the launch process the spring transfers 0.707 J of energy into the \'mouse Earth gravitational ...
*December 3, 2013*

**physics**

An obnoxious brat assigns his 0.0221-kilogram pet mouse Mickey the role of stunt mouse by stuffing him into a spring gun and shooting him up into the air at some angle. During the launch process the spring transfers 0.707 J of energy into the \'mouse Earth gravitational ...
*December 3, 2013*

**Science, Physics, math, calculus**

You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. You fire the arrow at 35.0 m/s oriented 30.0° above the horizontal from a height of 1.30 m while standing 47.0 m away on your first try. You may neglect ...
*November 24, 2013*

**Science, Physics, math, calculus**

Pool players often pride themselves on their ability to impart a large speed on a pool ball. In the sport of billiards, event organizers often remove one of the rails on a pool table to allow players to measure the speed of their break shots (the opening shot of a game in ...
*November 24, 2013*

**Science, Physics, math, calculus**

A toy rocket is fired at v0 = 41.2 m/s at an angle of è = 73.8 degrees with respect to the horizontal on flat level ground. Assuming that air resistance is negligible, what is its maximum height (H) and how far (R) will the rocket have traveled in the horizontal ...
*November 24, 2013*

**current and magnetism**

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? I tried the ...
*November 24, 2013*

**into computers**

What overriding philosophy of the Windows 8 operating system makes it unique compared to earlier Microsoft operating systems?
*November 20, 2013*

**magnets**

A proton with a velocity of 2.0 x 10^7 m/s in the horizontal (+x) direction enters a region of uniform magnetic field that is 1 meter wide and points out of the page with a magnitude of 0.05 Tesla. At what angle below the x-axis, in degrees, does the proton's trajectory ...
*November 20, 2013*

**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?
*November 20, 2013*

**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?
*November 20, 2013*

**Physics**

3. A positive helium ion He+ is released from rest at the surface of a +1000 V flat electrode. It travels in the +x-direction (in vacuum) across a 1 mm gap, passes through a small hole in a +0 V electrode that is parallel to the first one, and enters a region of magnetic field...
*November 19, 2013*

**physics**

Two forces act on an object. The first force has a magnitude of 17.0 N and is oriented 68.0° counter-clockwise from the x axis, while the 2nd force has x- and y-components (-19.0 N, 16.5 N). Express the magnitude and direction of the net force.
*November 14, 2013*

**Physics**

Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 93.3 N, Jill pulls with 73.1 N in the northeast direction, and Jane pulls to the southeast with 181 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
*November 14, 2013*

**Physics**

A 14.9-kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a 67.7-N horizontal force. Find the tension in the rope and the rope\'s angle from the vertical. The acceleration due to gravity is 9.81 m/s2.
*November 14, 2013*

**Physics**

To better understand the concept of static equilibrium a laboratory procedure asks the student to make a calculation before performing the experiment. The apparatus consists of a round level table in the center of which is a massless ring held in place with a pin. There are ...
*November 14, 2013*

**physics urgent help !**

if a 3e charge is at the origin and a magnesium nucleus is 3 cm from the originin the x-axis direction.what is the magnitude of the net electrostatic force a Boron nucleus would experience at the point half way between magnesium nucleus and 3e charge on the y-axis in N
*November 11, 2013*

**physics**

if 3e charge is at the origin and magnesium nucleus is 3 cm from the origin in the x-direction. what is the magnitude of the net force a boron nucleus would experience half way between magnesium nucleus and 3 e charge
*November 11, 2013*

**physics**

The magnitude of each force is 283 N, the force on the right is applied at an angle 41 and the mass of the block is 27 kg. The coefficient of friction is 0.283. The acceleration of gravity is 9.8 m/s2 . 27 kg μ = 0.283 283 N 41 degrees 283 N What is the ...
*November 10, 2013*

**physics**

A block is at rest on the incline shown in the figure. The coefficients of static and kinetic friction are μs = 0.7 and μk = 0.59, respec- tively. The acceleration of gravity is 9.8 m/s2 What is the frictional force acting on the 29 kg mass? Answer in units of N (...
*November 10, 2013*

**PreCal**

go to wolfram alpha and plug it in
*November 10, 2013*

**physics**

A block accelerates at 3.3 m/s2 down a plane inclined at an angle 27.0. m μk 3.3 m/s2 27 Find μk between the block and the in- clined plane. The acceleration of gravity is 9.81 m/s2 .
*November 10, 2013*

**physics**

Masses 19 kg and 9 kg are connected by a light string that passes over a frictionless pulley as shown in the figure ( The figure shows the 19 kg block on the table connected by a string through a pulley which is connected to the 5 kg block hanging off the table). The ...
*November 10, 2013*

**physics**

Masses 19 kg and 9 kg are connected by a light string that passes over a frictionless pulley as shown in the figure ( The figure shows the 19 kg block on the table connected by a string through a pulley which is connected to the 5 kg block hanging off the table). The ...
*November 10, 2013*

**physics**

A capacitor has a circular plate of radiusr=12cm that are at a distance of .2cm part.this is hooked up to 12 V battery. if this caoacitor is submerged in water what happens to the capacitance?
*November 10, 2013*

**physics**

if 3e charge is at the origin and magnesium nucleus is 3cm fom thr origin in the x-axis. what is the magnitude of the net electrostatic force a Boron nucleus would experience at a point half way between magnesium nucleus and 3e.
*November 10, 2013*

**physics**

if 3e charge is at the origin and the magnesium nucleus is 3cm from the origin in the +x direction, at what position along the x- axis should an electron be placed so that the electron experiences no net force?
*November 9, 2013*

**math**

Mortgage lenders base the mortgage interest rate they offer you on your credit rating. This makes it financially critical to maintain a credit score of 700 or higher. How much more interest would you pay on a $195,000 home if you put 20% down and financed the remaining with a ...
*November 9, 2013*

**calculus**

a spherical balloon filled with gas has a leak that permits the gas to escape at a rate of 1.5 cubic meters per minute. how fast is the surface area of the balloon shrinking when the radius is 4 meters?
*November 7, 2013*

**child development**

aaa
*November 7, 2013*

**physics**

A body of mass 25kg moving at 3m/s on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor.calculate the coefficient of sliding friction(g=10m/s^2)
*October 26, 2013*

**economics**

Clearly explain the different market structure and how they determine the degree of competition among firms and how they maximise profits in the short run and long run Cite the source within the text and bibliography
*October 19, 2013*

**Gen Chm II**

Determine the pressure-based Keq for the reaction: 2SO2(g) + O2(g)<--->2SO3(g) given that 1.00×10−2 moles of SO2 and 2.00×10−2 moles of O2 were initially placed in a 2.00 L reaction chamber. The chamber contained 7.5×10−3 moles of SO3 ...
*October 7, 2013*

**Chem**

An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 6635 J. What is the specific heat of the gas?
*October 6, 2013*

**Chem**

An 80.0-gram sample of a gas was heated from 25 °C to 225 °C. During this process, 346 J of work was done by the system and its internal energy increased by 6635 J. What is the specific heat of the gas?
*October 6, 2013*

**Chemistry **

Can someone walk me through how to work this I have no clue where to start. I have converted grams to moles and Celsius to kelvin but I don't know where to go from there. Thank you! A piece of dry ice (solid CO2, d = 0.900 g/mL) weighing 21.0 g is placed in a 0.870 L ...
*October 4, 2013*

**Brief Calc**

Very nice, thanks Reiny
*September 25, 2013*

**Brief Calc**

i submitted the answer steve had first and it came out correct for the previous question
*September 25, 2013*

**Brief Calc**

thank you that one was correct, i just had one other i couldn't get, the problem is find dy/dx using implicit differentiation: 4x+3y=xy i found the derivative to be... y-4/3-x same question as the last one, y=? dy/dx=? Thanks again for your help
*September 25, 2013*

**Brief Calc**

e^x y =3 find dy/dx using implicit differentiation the answer is -y Compare your answer with the result obtained by first solving for y as a function of x and then taking the derivative. y=? dy/dx=? help me out with these last two please I don't know what they are asking
*September 25, 2013*

**Chemistry**

A sample of impure magnesium was analyzed by allowing it to react with excess HCl solution: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) After 1.27 g of the impure metal was treated with 0.100 L of 0.768 M HCl, 0.0125 mol HCl remained. Assuming the impurities do not react, what...
*September 22, 2013*

**Science/ Chemistry**

When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained. a. Determine the empirical formula of the oxide. So for the empirical Formula I got P_2O_5 now it wants me to Write a balanced equation for the reaction of ...
*September 22, 2013*

**Chemistry**

What is the maximum mass of S8 that can be produced by combining 85.0 g of each reactant? 8SO2 + 16H2S yields 3S8 +16H2O
*September 21, 2013*

**physics**

30m
*September 19, 2013*

**Calculus**

Find the Indefinite Integral without u substitution of the following a)(8x-3)/(12x^6) b) 2sqrtx(5x-6) c) (4x+3)/xsqrtx d) (5x-6)^2 / sqrt x e) 16x^2 + x - 20 / 4x^2
*September 18, 2013*

**further Mathematics**

Let A=(cosA -sinA) (sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)
*September 17, 2013*

**further mathematics**

Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(A-B) sin(A B)) (sinA(A B) cos(A-B))
*September 17, 2013*

**Physics**

at the same time
*September 16, 2013*

**math**

In a regular hexagon, what is the ratio of the length of the shortest diagonal to the length of the longest diagonal? Express your answer as a common fraction in the simplest radical form.
*September 8, 2013*

**physics**

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
*September 4, 2013*

**physics**

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
*September 4, 2013*

**physics**

how far has it gone @bobpursley
*September 4, 2013*

**MATH**

THE QUOTIENT IS 45 1/4 WHAT IS THE DIVISOR
*September 3, 2013*

**Algebra**

(3Q+2T+F)/5=0.90 for F
*August 27, 2013*

**math**

Solve 3^x * 9^2x * 8^x/18^x *27^2x *3^2x
*August 24, 2013*

**us history**

The Constitution has endured for more than 200 years. Use what you have learned about the principles of the Constitution to explain why it has lasted as a framework for the nation's government
*August 23, 2013*

**us history**

What is taxation without representation? Why did the colonists consider this practice a problem?
*August 23, 2013*

**physics**

Time=distance/velocity =20/300 =0.067secs s = ut 1/2gt^2 s = 0*0.067 0.5*10*0:067^2 s = 0 5*0.004489 s = 0 0.0224 s = 0.022m
*August 21, 2013*

**physics**

Time=distance/velocity =20/300 =0.067secs s = ut 1/2gt^2 s = 0*0.067 0.5*10*0:067^2 s = 0 5*0.004489 s = 0 0.0224 s = 0.022m
*August 21, 2013*

**physics**

A bullet is fired in a horizontal direction with a muzzle velocity of 300m/s.in the absence of air resistance,how far will it have droppped in travelling a horizontal distance of 20m.
*August 20, 2013*

**writing**

Explain what is wrong with the following sentence and revise as needed to correct the problems: " While repelling from the cliff, my backpack slipped and fell to the canyon floor."
*August 7, 2013*

**Math Statistics**

5. Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 36 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this ...
*July 29, 2013*

**geometry**

consider a circle of radius 1, and corresponding inscribed and circumscribed polygons with the number of sides n = 3, 4, 5, 6, and 8. A: For each n = 3, 4, 5, 6 & 8, what are the areas of the inscribed and circumscribed polygons with n sides?
*July 27, 2013*

**Math Statistics**

2. A statistics professor has asked his students to flip coins over the years. He has kept track of how many flips land heads and how many land tails. Combining the results of his students over many years, he has formed a 95% confidence interval for the long-run population ...
*July 27, 2013*

**Math Statistics**

Students enrolled in an introductory statistics course at a university were asked to take a survey that indicated whether the student has a visual or verbal learning style. Of the 39 students who took the survey, 25 were judged to have a visual learning style and 14 were ...
*July 25, 2013*

**finance (math)**

nevermind... it's the same as 5%. I get it.
*July 22, 2013*

**finance (math)**

If you just use the Table of Future Value Factors, you'll see that 5% at 15 years is 2.079. Therefore, 75,000 * 2.079 = 155,925. I am really confused as to where the 1.05 comes from...
*July 22, 2013*

**finance (math)**

Where are you getting the 1.05 from?
*July 22, 2013*

**American National Government**

The purpose of gerrymandering a district is to- the influence of certain groups and gurantee that certain representatives keep their seats
*July 21, 2013*

**Math: Calc 2**

Find the volume of the solid obtained by rotating the region under the graph of the function f(x) = x^(13/12) about the x-axis over the interval [1,3]. Thanks!
*July 9, 2013*

**physics**

A 75.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.30 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?
*July 8, 2013*

**Phisics**

A speed boat is required to move at a constant speed of 50 MPH. What is the power needed to overcome a resistive force of 1000 lbs from the water?
*July 3, 2013*

**English**

What is the different between traditional Vietnamese and Vietnamese tradition?
*June 25, 2013*

**Discreet math**

[(pvq)^(p=>)^(q=>)]=>r[(pvq)^(p=>)^(q=>)]=>r
*June 25, 2013*

**Math 61 part 2**

Find the centriod of the boundEd by the curvez y=x^2 and y=2x+3
*June 24, 2013*

**Math 61**

Find the arc length of the curve y^3=8x^2 fr0m x=1 to x=8.
*June 23, 2013*

**statistics**

The customer bills in a family restaurant are normally distributed. The bills mean is $28 and has a standard deviation of $6. a. Identify what the random variable you are measuring is in this problem. b. What is the probability that a randomly selected bill will be at least $...
*June 22, 2013*

**World Geography**

reconciling diverse cultural heritages
*June 19, 2013*

**Geometry**

53. What is the equation of the circle with center (2, –5) that passes through the point (–2, 10)? (1 point) (x – 2)2 + (y – (–5))2 = 25 (x – (–2))2 + (y – 10)2 = 241 (x – 2)2 + (y – (–5))2 = 241 (x – (–2))2 + (y...
*June 10, 2013*

**Geometry**

50. Find the value of x for ° and °. The figure is not drawn to scale. (1 point) 34° 56.5° 22° 68°
*June 10, 2013*

**Geometry**

46. Assume that lines that appear to be tangent are tangent. O is the center of the circle. Find the value of x. Figures are not drawn to scale. mO = 128° (1 point) 52 308 64 256
*June 10, 2013*

**trigonometry**

how do i determine the point of intersection of a circle with a radius of 14 and the line coming in at a 35 degree angle
*June 6, 2013*

**physics**

A juggler traveling in a train on level track throws a ball straight up, relative to the train, with a speed of 5.75 m/s. The train has a velocity of 19 m/s due east. (a) As observed by the juggler, what is the ball's total time of flight? s What is the displacement of the...
*May 30, 2013*

**Physics**

How much work does it take to stretch a spring with k= 150N/M 10cm from equilibrium?
*May 30, 2013*

**Physics**

If the coefficient of kinetic friction is 0.25, how much work do you do when you slide a 45 kg box at constant speed across a 5.8m -wide room?
*May 30, 2013*

**Physics**

Segment A 540-0/120-0 =4.5 Segment B 0-0/0-0 = 0 Segment C 1080-540/288 = 7.5
*May 29, 2013*

**Physics**

A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 60 s per increment, and the scale for the velocity axis is 270 m/s per ...
*May 29, 2013*

**CHEMISTRY**

Which of these statements is not true? lithium reacts with carbon to form ionic carbides, Acetylene is neccesary for the formation of some carbide liquid ammonia is is used to form carbides All metals react with carbon to form carbides
*May 29, 2013*

**Chem**

The molar weight of MgSO4 is 120.366gmol-1. What is the mass/volume percentage of a 2.5M water solution of MgSO4?
*May 27, 2013*