if a bar of copper is brought near a magnet, the copper bar will be? A)attracted by the magnet. B)unaffected by the magnet. C)repelled by the magnet. D)made into an induced magnet. B)unaffected by the magnet. Actually there is a

6,518 questions
1. electricity

if a bar of copper is brought near a magnet, the copper bar will be? A)attracted by the magnet. B)unaffected by the magnet. C)repelled by the magnet. D)made into an induced magnet. B)unaffected by the magnet. Actually there is a very slight repulsn due to

asked by angela on August 24, 2005
2. science

if a bar of copper is brought near a magnet, the copper bar will be not magnetic, nonferrous, not attracted to the magnet, etc

asked by rita on October 8, 2006

1. For a bar magnet, the magnetic field lines point a. towards the South pole. b. towards the North pole. c. always towards the magnet. d. always away from the magnet. my answer: a 2. Magnetic field lines a. are straight lines. b. are always circles. c.

asked by Liz on May 10, 2014
4. physics

A compound metal bar has 4 kg of copper making up the first third of the bar, while the remainder is made of 12 kg of lead. The bar is 3 meters in length. In addition, a mass of 2 kg is hung 1m from the left end of the bar, and a mass of 6 kg is hung 2m

asked by tyger2020 on December 5, 2018
5. Physics

A "Bus" bar is in the form of a slab of copper 2meters long, 1cm wide, and 10 cm thick. a) What is the resistance of the bar at 0 degrees celcius? b) What potential difference is needed to push 5000 amps through the bar?

asked by Tristan on May 16, 2010
6. electromagnetism

Two identical bar magnets A and B are held at rest as shown and released to fall simultaneously. Magnet A as it falls passes through the center of a copper ring, magnet B does not. #9 (4 points possible) Which of the following statements is true? -

asked by JuanPro on April 14, 2015
7. strength of materials

The composite bar BCD in the figure is fixed at the wall B (x=0), and has constant cross sectional area A_0. The bar is composed by joining, at section C, two segments (BC and CD) of equal length L. Segment CD is homogeneous, made of copper. Segment BC is

asked by ashwni on July 17, 2016
8. Physics

The composite bar BCD in the figure is fixed at the wall B (x=0), and has constant cross sectional area A_0. The bar is composed by joining, at section C, two segments (BC and CD) of equal length L. Segment CD is homogeneous, made of copper. Segment BC is

asked by skrillex on July 17, 2016
9. science

When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200°C to 85°C. The specific heat of copper is

asked by Anonymous on October 14, 2014
10. Physics

The substation bus bar is made up of 2-iches round copper bars 20 ft. long. What is the resistance of each bar if resistivity is 1.724 x 10-6 ohm-cm.

asked by Jhun on September 25, 2015
11. Physics mit 2.01x

F13Q1_1: COMPOSITE BAR UNDER DISTRIBUTED LOADING The composite bar AB has length L and is fixed at A(x=0). The bar has a constant cross-section and is composed of two steel plates, of modulus Es=2E0 sandwiching a copper core of modulus Ec=E0. The steel

asked by Michael on July 15, 2014
12. Physics

13. George has a bar magnet and a coil connected to a battery. To perform an experiment, he needs to use different values of current through the wire. How can he generate different values of electric current through the wire without connecting any other

asked by Landon on May 26, 2009
13. Science

Place the North Pole of a bar magnet to the North Pole of another bar magnet. Note the distance at which they repel each other. Then place the North Pole of a bar magnet to the South Pole of another bar magnet and take note of the distance at which they

asked by jessie on February 18, 2009
14. Mechanics

The composite bar BCD in the figure is fixed at the wall B (x=0), and has constant cross sectional area A0. The bar is composed by joining, at section C, two segments (BC and CD) of equal length L. Segment CD is homogeneous, made of copper. Segment BC is

asked by Tony on October 28, 2017
15. Physical Science

The Magnetic field lines of a bar magnet begin near the magnet's _____________. I believe this question is asking where the lines begin (ie leave) the bar magnet...which would be the north pole.

asked by Danny on September 4, 2013
16. physics

A large bar magnet (mass of 0.4 kg) exerts a 5 N force on a small bar magnet (mass of 0.1 kg) located 20 cm away. Calculate the force exerted by the small bar magnet on the large one.

asked by henry on June 7, 2018
17. Science

the specific heat capacity of solid copper metal is 0.385 j/g k. Calculate temperature rise of 100g bar of copper when 250J of heat is transferred into it?

asked by Sanjana on February 14, 2018
18. physics

if theta is the angle between unit vectors A bar and B bar, then (1-A bar.B bar)/(1 plus A bar.B bar) is equal to

asked by raghavendra on July 9, 2014
19. Vector , physics

In a regular hexagon ABCDEF prove that AB bar+AC bar +AD bar+AE bar+AF bar =6AO bar

asked by Sindhuja on August 11, 2016
20. PHYSICS

1...At what temp. of 0^C steel rod and copper rod have length of 800.1 & 99.9 respectively. At what temp. will the 2 rods have the same length. coeff.of linear expansion Copper-.000017 steel-.000013 2...The length of a brass bar increase from 4.001 into

asked by EM on March 13, 2011
21. physics

Hello everyone, I need help with this question: A bartender slides a glass of beer down a bar with an initial velocity of 2m/s. The coefficient of kinetic friction of the bar is 0.05 and the length of the bar is 3m and the height of the bar is 1m. The mas

asked by Leo on September 4, 2012
22. Physics - Conducting Rails

Two conducting rails 39.2 cm apart rest on a 4.11° ramp. They are joined at the bottom by a 0.520 Ω resistor, and at the top a copper bar of mass 0.0450 kg is laid across the rails. The whole apparatus is immersed in a vertical 0.580 T field. What is the

asked by Ashton on October 10, 2014
23. Physics

A bar of aluminum (bar A) is in thermal contact with a bar of iron (bar B) of the same length and area. One end of the compound bar is maintained at Th = 75.5°C while the opposite end is at 30.0°C. Find the temperature at the junction when the energy

asked by Chelsea on November 27, 2010
24. PHYSICS

1..........At what temperature of 0^C steel rod & copper rod have length of 800.1cm and 99.9cm respectively. At what temperature will the 2 rods have the same length. Coefficients of linear expansion (per °C) copper rod----.000017 steel rod-------.000012

asked by eissa on March 14, 2011
25. PHYSICS

1..........At what temperature of 0^C steel rod & copper rod have length of 80.1cm and 99.9cm respectively. At what temperature will the 2 rods have the same length. Coefficients of linear expansion (per °C) copper rod----.000017 steel rod-------.000012

asked by eissa on March 14, 2011
26. Chemistry

Copper dissolves in nitric acid, producing copper (ll) nitrate. After reaction with sodium hydroxide and heating, copper nitrate changes to copper (ll) oxide. Calculate the percent yield of this process if 1.235 g of copper produced 1.452 g of copper

asked by Raj on October 28, 2007
27. ThermoChemistry

If 18 g of Kr initially at 0.5 bar and 18 L is brought to 0.49 bar and 5L, what is the overall change in enthalpy of this process? Assume that Kr is an ideal gas.

asked by LaurenB on December 2, 2011
28. physics

The drawing shows a 156-kg crate hanging from the end of a steel bar (S = 8.1 x 1010 N/m2). The length of the bar is 0.117 m, and its cross-sectional area is 7.44 x 10-4 m2. Neglect the weight of the bar itself and determine (a) the shear stress on the bar

asked by S on November 12, 2014

If you hold a bar magnet in each hand and bring your hands together, will the force be attractive or repulsive if the magnets arte held so that A) the tow north poles are brought close together? B) a north pole and a south pole are brought together?

asked by David Nipp on May 5, 2010
30. Chemistry

You synthesized copper (I) chloride and copper (I) oxide. How do they differ from their copper (II) analogs? comment on the stability of these moist solids in air. If unstable, what is the likely product of decomposition? -I'm not really sure where to go

asked by Dan on November 8, 2015
31. physics

a uniform bar of mass is supported by support pivoted at top about which bar can swing like simple pendulum. If force F is applied perpendicular to lower end of the bar.How big F must be in order to held the bar in equilibrium.

asked by bharat narke on January 16, 2011
32. Chemistry

1. is it easy to distinguish between between the different oxidation states of copper? why? 2. You synthesized copper (I) chloride and copper (I) oxide. How do they differ from their copper (II) analogs? comment on the stability of these moist solids in

asked by Dan on November 8, 2015
33. Physics

A 60-cm-long, 500 g bar rotates in a horizontal plane on an axle that passes through the center of the bar. Compressed air is fed in through the axle, passes through a small hole down the length of the bar, and escapes as air jets from holes at the ends of

asked by Zach on November 30, 2009
34. PHYSICS

There's a bar with length of 6.49m and mass of 5.45kg leaning against a frictionless wall. It makes an angle of 66.08 deg with the ground. A block with mass of 44.98 kg hangs from bar at distance d up from point of contact between bar and floor. The

asked by Alie on October 24, 2007
35. physics

A 45.0 g ball of copper has a net charge of 1.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Justin on August 21, 2013
36. physics

A 52.0 g ball of copper has a net charge of 2.1 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by taryn on January 27, 2013
37. Physics

A 45.0 g ball of copper has a net charge of 2.3 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Katelyn on February 7, 2015
38. Physics

A 54.8 g ball of copper has a net charge of 2.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Carlos Montoya on March 9, 2015
39. physics

A 45.0 g ball of copper has a net charge of 1.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Justin on August 24, 2013
40. physics

A 45.0 g ball of copper has a net charge of 1.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

asked by Justin on August 26, 2013
41. physics

The drawing shows a copper wire (negligible resistance) bentinto a circular shape with a radius of 0.48 m. The radial sectionBC is fixed in place, while the copper bar ACsweeps around at an angular speed of 16 rad/s. The bar makeselectrical contact with

asked by Daniel on March 12, 2012
42. physics

bar subjected to gravity load (two segments) the bar in the fig has constant cross sectional area A .the top half of the bar is made of material with mass density and youngs module, the bottom half of the bar made of density and young module total length

asked by mehwish on May 1, 2013
43. physics

bar subjected to gravity load (two segments) the bar in the fig has constant cross sectional area A .the top half of the bar is made of material with mass density and youngs module, the bottom half of the bar made of density and young module total length

asked by mehwish on May 1, 2013
44. physics

bar subjected to gravity load (two segments) the bar in the fig has constant cross sectional area A .the top half of the bar is made of material with mass density and youngs module, the bottom half of the bar made of density and young module total length

asked by mehwish on May 1, 2013
45. Chemistry

38.0kg mass of copper is melted to be cast into a graphite mold at a copper pipe foundtry. If the solid copper starts off at the normal melting temperature of copper and the liquid copper is put into the mold at the crystallization point of copper, how

asked by Jacob on August 15, 2012
46. Science

When a bar magnet is cut into two halves repel each other. Why? What becomes of the original north and south poles of that magnet??

asked by Carl on May 3, 2019
47. Science

When a bar magnet is cut into 2, the two halves repel each other. Why? What becomes the original north and south poles of that magnet?

asked by Lyn on May 2, 2019
48. Science

When a bar magnet is cut into two halves repel each other. Why? What becomes of the original north and south poles of that magnet?

asked by Lyn on April 30, 2019
49. Physics

Tapered bar with end load The small tapered bar BC has length L=0.1 m and is made of a homogeneous material with Young’s modulus E=10 GPa. The cross sectional area of the bar is slowly varying between A0=160 mm^2 (at B) and A0/2 (at C), as described by

asked by helpless on April 30, 2013

One of the reactions involved in the smelting of copper sulfide ores involves copper (I) oxide and copper (I) sulfide: 2Cu2O2 + Cu2S ---> 6Cu + SO2 Assuming that 35.00 g of copper (I) oxide is heated with 25.00 g of copper (I) sulfide A) determine which

asked by Rose on December 7, 2014
51. Physics

A 30m bar with a mass of 20kg is being lifted by a string. The bar makes an angle of 55 degrees above horizontal (between the bar and ground). The string is attached to the ceiling vertically. What is the tension on the string? What is the normal force

asked by Riley on July 16, 2017
52. Chemistry

is it easy to distinguish between between the different oxidation states of copper? why? -I answered yes because copper (I) is not as stable as copper (II), and there is a noticeable colour difference You synthesized copper (I) chloride and copper (I)

asked by Dan on November 8, 2015
53. chemistry

One of the reactions involved in the smelting of copper sulfide ores involves copper(I) oxide and copper (I) sulfide: 2Cu2O(solid) + Cu2S(solid) ---> 6Cu(solid) + SO2(gas) Assuming that 35.00 g of copper (I) oxide is heated with 25.00 g of copper (I)

asked by Anonymous on December 6, 2014
54. AP Chem

Write the net ionic formula. A bar of strontium metal is immersed in a 1.0 M copper (II) nitrate solution. How do I go about doing this?

asked by Needs help on October 3, 2007
55. PHYSICS

A 0.75 Tesla bar magnet is placed inside of a coil made up of 350 turns of wire, each loop having an area of 0.002 m^2. How much electromagnetic flux is created when the magnet is quickly pulled out of the coil? How much voltage is induced in the coil if

asked by GRISSELL on April 8, 2012
56. Science

what are some health risks of copper to humans? what are the environmental riks of copper? what are the benefits of copper to the industry, economy, and society? what are all the organisms that are affected by copper? what is meant by the term

asked by Louis on February 26, 2013
57. Physics

65 kg pole vaulter running at 10.2 m/s vaults over the bar. if height of bar was set at 4.96 m how fast was he moving as he cleared the bar

asked by Anonymous on December 18, 2014
58. science

when current flows through a wrapped in coils around a bar magnet, a temporary magnet known as a _________________ is created. Did you omit a word? perpahs metal. For the blank, are you thinking of electromagnet?

59. physics

how long will it take for a 1.5A current to coat evenly a layer of copper 0.1mm thick on both sides of a 12cm by 12cm copper plate(e.c.e of copper is 0.000331gC; density of copper 9gcm?

asked by poppy on April 26, 2019
60. phys

A 0.190 kg piece of copper is heated and fashioned into a bracelet. The amount of energy transferred as heat to the copper is 6.62 x 10^4 J. If the specific heat of copper is 387 J/kg x °C, what is the change in temp of the copper?

asked by abbigail on November 2, 2009
61. physicss

A 0.190 kg piece of copper is heated and fashioned into a bracelet. The amount of energy transferred as heat to the copper is 6.62 x 10^4 J. If the specific heat of copper is 387 J/kg x °C, what is the change in temp of the copper?

asked by arriell on November 1, 2009
62. Science

1.0 g of copper was heated in a crucible, while stirring, and .2g of unreacted copper was recovered usoing hydrochloric acid as a solvent, how much copper would precipitate when zinc is later added to the copper oxide/acid solution?

asked by R Johnson on March 13, 2013
63. Chemistry

A student was isolating copper metal from a copper salt. If the student started with 1.255g of copper (II) sulfate how many grams of copper solid would you expect them to recover?

asked by Caroline on December 7, 2014
64. math

The cost of a X chocolate bar is \$3.50. The cost of a similar Y bar is \$3.20. (a) Find the percentage saving in buying a Y bar instead of the X bar. (b) Find the percentage loss in buying a X bar instead of the Y bar. Please help...........

asked by running.from.myself on February 7, 2012
65. chemistry

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 22.8 g copper(II) oxide is used?

asked by nikki on January 25, 2011
66. Chemistry

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 34.0 g copper(II) oxide is used?

asked by Grace on February 24, 2014
67. Chemistry

determine how much copper you will use. based on the mass of silver nitrate, calculate how much copper will you need to ensure copper is the excess reactant. you need to use 300% excess copper. Help me please!

asked by Tabatha on December 7, 2011
68. Physics

A bar of length 2L can rotate about a frictionless axle at its center. The bar is initially at rest and is then acted on by the three forces shown. What is the magnitude of the net torque on the bar?

asked by Amanda on November 10, 2016
69. chemistry

using your initial mass of copper, calculate the minimum volume of concentrated 12M nitric acid needed to completely react with your copper to form copper(II) nitrate? Original mass of copper was 0.40g.

asked by anon on September 18, 2014
70. chemistry

Let's say for example I have 5g of copper in a beaker. Mass would be 5g + mass of beaker. If I add any given amount of water to the beaker containing the copper, that will change the mass of the beaker containing the copper. Am I correct so far? So then if

asked by J on November 5, 2014
71. chemistry

An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0% copper. Could these solids be samples of the same copper-containing compound? Please help.

asked by Anonymous on January 21, 2013
72. science

An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0% copper. Could these solids be samples of the same copper-containing compound?

asked by Donald on October 23, 2013
73. Chemistry

Naturally occurring copper contains a mixture of 69.09% copper-63 (63.9298 amu) and 30.91% copper-65 (64.9278 amu). What is the average atomic mass of copper?

asked by ashley on January 27, 2012
74. Physics

A 5.80 kg ball is dropped from a height of 14.5 m above one end of a uniform bar that pivots at its center. The bar has mass 9.00 kg and is 6.40 m in length. At the other end of the bar sits another 5.30 kg ball, unattached to the bar. The dropped ball

asked by Joe on April 5, 2012
75. physics

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density

asked by Joe on July 6, 2016
76. Chemistry

the diameter of a copper atom is roughly 1.3×10^-10 m. how many times can you divide evenly a piece of 10cm copper wire until it is reduce to two seperate copper atoms? (assume there are appropriate tools for the procedure and that copper atoms are lined

asked by Shane Rey on June 27, 2018
77. Chemistry

Give the formula of each of the following copper minerals: A. cuprite, copper (I) oxide B. chalcocite, copper (I) sulfide C. covellite, copper (II) sulfide

asked by Tiffany on January 23, 2012
78. vector mechanics- dynamics

The slender bar AB weights 8 kg and moves in the xy plane, with its ends constrained to follow the smooth horizontal and vertical guides as shown in Figure Qi. By assuming the bar AB is initially at rest; a) Calculate the angular acceleration of the bar.

asked by Farah on October 14, 2014
79. Chemistry

A galvanic cell is connected to a small light bulb for 40.0 minutes. The electrodes are copper and silver and the copper electrode is immersed in a solution of copper sulfate. During that time, the average current drawn by the bulb is 0.12 A. a. What is

80. Physics

On a frictionless table, a glob of clay of mass 0.54 kg strikes a bar of mass 1.24 kg perpendicularly at a point 0.27 m from the center of the bar and sticks to it. 1. If the bar is 1.02 m long and the clay is moving at 6.3 m/s before striking the bar,

asked by Neomi on February 12, 2014
81. Mechanics _ physics

A uniform bar 1m long is pivoted at the centre has a mass of 3kg. It is acted upon by a conquer which cause to possess an angular acceleration of 6rad/sec^2; calculate a. The moment of inertia of the bar b. The torque on the bar

asked by Precious on February 14, 2013
82. Chemistry

Hello I have a question about a reaction. I have to give the final products of mixed copper (II) sulfate, sodium chloride and finally copper. My teacher told me that it is formed a copper chloride, but which of the two that exists? And how would it be the

asked by Mary1989 on December 28, 2017
83. probabilty

Smitty's Bar and Grill has brand name recognition of 61% around the world. Assuming we randomly select 2 people. The assumptions of a Bernoulli process are met. What is the probability a)exacatly 5 of the 12 recognize the name of Smitty's Bar and Grill?

asked by dee on September 23, 2011

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees

asked by Joseph on June 6, 2016
85. physics

A copper bar is initially 20 cm long at 10 degrees C. It is then heated to a temperature of 40 degrees C. What will be its new length?

asked by Crystal on March 29, 2011

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees

asked by Joseph on June 6, 2016
87. Chemistry

In chemistry, we did a lab in which we had a certain mass of copper, performed multiple experiments on the copper, and at the end, extracted the copper from a solution and weighed it. The goal was that the mass of the final copper should be the same as the

asked by melbell on October 5, 2014
88. scienc

three vertical wires in the same plane are suspended from horizontal support. they are all in the same length and carry a load by means of rigid cross bar at their lower ends.one end is of copper

asked by mik on September 20, 2015
89. physics

Suppose we wish to use a 4.0 m iron bar to lift a heavy object by using it as a lever. If we place the pivot point at a distance of 0.5 m from the end of the bar that is in contact with the load and we can exert a downward force of 640 N on the other end

asked by lol on November 16, 2014
90. physcial science

Why is a nail attracted to either pole of a magnet, but another magnet is attracted to only one of the poles?

asked by jan on June 24, 2007
91. physics

Is copper (Cu) the same as copper64 (Cu64)? Cu64 is a radioactive isotope of copper. Its half life is 12.8 hours. During the few days it is around, it behaves chemically like any other copper isotope, but eventually it all turns into something else. The

asked by naomi on February 20, 2007
92. Chemistry

Ik this has been answered, but doesn't the copper oxide have something to do with it? And could you explain it in simpler terms? I'm just confused because you said forget the copper oxide, but your using it somehow, what puzzles me is the carbon dioxide,

asked by Harry on February 23, 2014
93. Chemistry

I cannot understand how the mass of the system has changed. There's no need for you to do my work please just explain it to me! :) thanks so much A scientist placed copper powder into a crucible and heated it until all of the copper reacted. The resulting

asked by nicole on September 29, 2015
94. Chemistry

At 25 °C, the equilibrium partial pressures for the following reaction were found to be PA = 4.10 bar, PB = 5.60 bar, PC = 1.20 bar, and PD = 9.70 bar. 2A(g)+2B(g)-->C(g)+ 3D(g) What is the standard change in Gibbs free energy of this reaction at 25 °C.

asked by Alexis on April 25, 2014
95. Physics

Is there any difference in the effect of linear dilation in between a bar and a hollow bar? Which ones dilates the most? My guess is that the hollow bar as there is less material, so it can be heated up faster. I don't know if I am correct.

asked by Fred on February 11, 2019
96. chemistry

consider the reaction between copper metal and chlorine gas producing solid copper(1) chloride. when 16.2g of copper is reacted in an excess of chlorine, how many grams of copper(1) chloride will be produced

asked by janice on April 28, 2012
97. Physics

A 51.8 kg pole vaulter running at 11.5 m/s vaults over the bar. Her speed when she is over the bar is 1.26 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar

asked by Anonymous on March 10, 2013
98. physics

A 52-kg pole vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.

asked by monic on October 12, 2012
99. thermodinamics

2. A sample of an ideal gas underwent an expansion against a constant external pressure of 1.0 bar from 1.0 m3, 20.0 bar, and 273 K to 100.0 m3, 1.0 bar, and 273 K. What is the work done by the system on the surroundings

asked by dhaval on February 28, 2014
100. Physical Chemistry

Take 3.00 mol of an ideal gas at Pi=25.0 bar, Vi=4.50L, and expand it isothermally. Calculate the work done in two different processes. a. Reversible expansion at Pf=4.50 bar b. Irreversible expansion at Pext=4.50 bar

asked by Sarah Kennedy on September 4, 2012