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April 24, 2014

# Search: A 18.0 V battery is connected to a 4.10 &micro;F capacitor. How much energy is stored in the capacitor?

Number of results: 689

Physics
A battery charger is connected to a dead battery and delivers a current of 4.5 A for 6.0 hours, keeping the voltage across the battery terminals at 12 V in the process. How much energy is delivered to the battery?
Thursday, September 6, 2007 at 8:19pm by Mary

chemistry
What is the general form of a common automobile battery? How many electrodes does a car battery use? Does it use an acidic aqueous electrolyte solution? Is the battery rechargeable? Is the battery voltaic or electrolytic when discharging? Is the battery voltaic or electrolytic...
Friday, April 27, 2012 at 10:23am by Anonymous

physics
Consider a battery that has Vt = 12.0 V when it is not connected to a circuit. When a 10.0- resistor is connected with the battery, the potential difference across the battery’s terminals drops to 10.9 V. What is the internal resistance of the battery?
Wednesday, September 12, 2012 at 8:32am by anna

physics
A 8 V flashlight battery has an internal resistance of 1.7 Ω when new, and 8 Ω when old. Imagine this is a resistor in series with the battery mounted INSIDE the battery itself, which describes the chemical degradation of the battery with age. Calculate the voltage ...
Tuesday, July 19, 2011 at 2:16pm by Naina

physics
The voltage across the terminals of a 8.90 V battery is 8.00 V when the battery is connected to a 50.0 \Omega load.What is the battery's internal resistance?
Wednesday, March 9, 2011 at 9:36pm by Mitchell

Physics
A battery delivering a current of 55.0 A to a circuit has a terminal voltage of 21.8 V. The electric power being dissipated by the internal resistance of the battery is 36 W. Find the emf of the battery.
Monday, February 18, 2013 at 7:00pm by Anonymous

Physics
If the emf of a battery is 23 V and a current of 66 A is measured when the battery is shorted, what is the internal resistance of the battery? Answer in units of Ω How would you set up the equation to solve?
Monday, March 4, 2013 at 5:09pm by Tiffany

Physics
A battery has an internal resistance of 0.42. A number of identical light bulbs, each with a resistance of 31.500, are connected in parallel across the battery terminals. The terminal voltage of the battery is observed to be one-half the emf of the battery. How many bulbs are ...
Wednesday, September 26, 2012 at 7:47pm by Luis

Physics
A 2.0-ohm resistor is connected in series with a 20.0-V battery and a three-branch parallel network with branches whose resistances are 8.0 ohms each. Ignoring the battery's internal resistance, what is the current in the battery?
Thursday, April 4, 2013 at 5:17pm by leo

PHYSICS
When the resistors are connected in series to a 12.0-V battery, the current from the battery is 1.73 A. When the resistors are connected in parallel to the battery, the total current from the battery is 10.1 A. Determine the two resistances.

Solar Energy
a) Consider a lead acid battery with 100Ah capacity and a rated voltage of 24V. What is the total capacity of energy in Watt-hours that can be stored in the battery? b) Assume that the battery is completely empty. The battery is now charged at a C-rate of 0.50C. What is the ...
Thursday, November 14, 2013 at 6:20am by Anonymous

physics
A new "D" battery has an emf of 1.5 V. When a wire of negligible resistance is connected between the terminals of the battery, a current of 25 A is produced. Find the internal resistance of the battery. ________ Ω
Wednesday, January 26, 2011 at 11:36pm by ali-1

CHEMISTRY
Suppose that a fully charged lead¨Cacid battery contains 1.16 L of 5.00 M H2SO4. What will be the concentration of HSO4- in the battery after 2.83 A of current is drawn from the battery for 6.3 h? Pb(s) + PbO2(s) + 2H+(aq) + 2HSO4−(aq) ¡ú 2PbSO4(s) + 2H2O(l) Enter your ...
Saturday, December 1, 2012 at 12:11am by sabrina:help please

physics
A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing. What is the total charge (in coulombs) that this battery can provide? Determine the maximum current that the ...
Wednesday, January 30, 2008 at 8:50pm by rick

Physics
A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. (C is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged by a battery. For ...
Monday, February 6, 2012 at 7:43pm by Jeff

Physics
I have a circuit with three capacitors and a battery. The battery supplies 15V. The battery is in series with C3. C3 is in series with ( C23). C3= 3*10^-6 F C2= 2 *10^-6 F C1= 1*10^-6 F (respectively C2 +C3 are is parallel withe ach other). I know the equivalent capacitance ...
Wednesday, February 10, 2010 at 6:57pm by Sara

physics
To recharge a 12 V battery, a battery charger must move 2.7 × 105 C of charge from the negative terminal to the positive terminal. How much work is done by the battery charger? Answer in units of J
Monday, April 16, 2012 at 1:25pm by Anonymous

Physics
A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. (C is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged by a battery. For ...
Thursday, February 14, 2013 at 9:45pm by Nicole

Physics
A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. (C is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged by a battery. For ...
Thursday, February 14, 2013 at 10:07pm by Nicole

Physics
A car battery is rated at 90A hr, meaning that it can supply a 90A current for 1 hr before being completely discharged. If you leave your headlights on until the battery is completely dead, how much charge leaves the positive terminal of the battery?
Wednesday, February 17, 2010 at 6:24pm by Anthony

Physics
A 79.4-Ω and a 47.7-Ω resistor are connected in parallel. When this combination is connected across a battery, the current delivered by the battery is 0.296 A. When the 47.7-Ω resistor is disconnected, the current from the battery drops to 0.126 A. (a) Determine...
Wednesday, March 6, 2013 at 5:06am by ann

Chemistry
A battery is constructed based on the oxidation of magnesium and the reduction of Cu^2+. The initial concentrations of Mg^2+ and Cu^2+ are 1.2*10^-4M and 1.5M, respectively, in 1.0-L half-cells. The initial voltage of the battery is 2.83V with the standard voltage at 2.71V. ...
Sunday, May 2, 2010 at 8:31pm by Emma

A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V Volts. (C is the capacitance and U is the stored energy.) Select true or false for each statement. 1) With the capacitor connected to ...
Monday, February 6, 2012 at 8:17pm by archi

Chemistry
how do you identify an anode and cathode by direct observation in an electochemical battery when you dont have a voltmeter and the chemicals are no known. I look on the battery for a + and - sign. In a battery, the + pole is the cathode and the - pole is the anode.
Thursday, January 11, 2007 at 10:20pm by lucie

General Physics 2
A dead battery is charged by connecting it to the live battery of another car with jumper cables. Assume that V = 9 V and R = 0.80 Ù. Determine the current in the starter. Determine the current in the dead battery.
Sunday, October 27, 2013 at 12:49am by Sabrina

maths
a computer game and battery costs£21. the game costs £20 more than the battery.so how much does the battery cost?
Sunday, June 8, 2008 at 7:25am by bill

Physics
Suppose the battery on your phone delivers a current of 0.740 mA (that's milliAmperes) over a time of 4.00 hours. What is the total charge that flows out of the battery during this time? AND How many electrons flow out of the battery during this time?
Monday, January 28, 2013 at 1:24pm by Tessa

AP PHYSICS
A 3.0-uF capacitor and a 4.0-uF capacitor are connected in series across a 40.0-V battery. A 10.0-uF capacitor is also connected directly across the battery terminals. Find the total charge that the battery delivers to the capacitors. I NEED HELP WITH THIS PROBLEM. THANKS!
Tuesday, April 1, 2008 at 1:37pm by Becky

Physics
I'm stumped on what formula to use for the following question. A 1.5V battery does 4.5*10^2 J of work in 120s. Calculate the current through the battery Calculate the number of elementary charges that pass through the battery. I've been trying to figure out the formula to ...
Wednesday, August 26, 2009 at 11:03pm by Kate

Physics
Suppose you make an electromagnet with a copper wire and a battery by putting the two ends of the wire on the two ends of the battery. If you switch the side of the battery, are you changing the magnetic poles of the wire?
Wednesday, April 9, 2014 at 1:32pm by Anonymous

Science
Suppose you make an electromagnet with a copper wire and a battery by putting the two ends of the wire on the two ends of the battery. If you switch the side of the battery, are you changing the magnetic poles of the wire?
Wednesday, April 9, 2014 at 4:38pm by Anonymous

calculus
An electrical circuit switches instantaneously from a 3 volt battery to a 23 volt battery 6 seconds after being turned on. Sketch on a sheet of paper a graph the battery voltage against time. Then fill in the formulas below for the function represented by your graph. For t<...
Sunday, September 8, 2013 at 3:08pm by nicole

Physic
Why is the potential difference between the terminals of a battery is not always equal to the e m f of a battery
Thursday, April 3, 2014 at 9:43am by Kenah

Chemistry
Compare & Explain the differences between a lead-acid battery and a dry-cell battery?
Wednesday, November 3, 2010 at 7:21pm by sarah

physics
An old battery with an emf of 9.0 V has a terminal voltage of 7.8 V when it is supplying a current of 1.5 mA. What is the internal resistance of the battery?
Monday, February 24, 2014 at 12:38pm by mercedes

electricity and electronics
a battery consists of five cells connected in series if the voltage developed by each cell is 1,5 the total voltage developed by the battery is 5 x 1.5 = 7.5 V Battery voltages add when connected in series.
Wednesday, August 10, 2005 at 3:25pm by annette

math
A car has a 12 volt battery. The engine has a resistance of 0.22 ohms. How many amps will be drawn from the battery when the key is turned?
Sunday, June 17, 2012 at 11:10pm by Leo

physics- electricity
An electric car uses a lithium metal hydride battery with a mass of 250 kg. The battery delivers 300v and holds a stored charge q of 70 ampere-hours. Calculate the total energy stored in the battery in kWh. Calculate the number of gallons of gas that would have an equivalent ...
Wednesday, February 27, 2013 at 11:37am by Anonymous

physical
A battery of e.m.f 24v and internal resistance of 4ohms is connected to a resistor of 3ohms.what is the terminal potential difference of the battery
Sunday, March 6, 2011 at 1:33pm by vincent

chem
Suppose that a fully charged lead-acidbattery contains 1.50 of 5.00 . What will be the concentration of in the battery after 3.90 of current is drawn from the battery for9.00 ? \
Wednesday, July 31, 2013 at 7:00pm by paco

PHYSICS 2
Two resistors have resistances R(smaller) and R(larger), where R(smaller) < R(larger). When the resistors are connected in series to a 12.0-V battery, the current from the battery is 1.99 A. When the resistors are connected in parallel to the battery, the total current from...

pHYSICS
Two resistors have resistances R(smaller) and R(larger), where R(smaller) < R(larger). When the resistors are connected in series to a 12.0-V battery, the current from the battery is 1.99 A. When the resistors are connected in parallel to the battery, the total current ...

physics
A battery has an internal resistance of 0.016 and an emf of 9.00 V. What is the maximum current that can be drawn from the battery without the terminal voltage dropping below 8.75 V?
Thursday, March 22, 2012 at 8:03am by Anonymous

Physics
A battery has an internal resistance of 0.017 Ù and an emf of 9.00 V. What is the maximum current that can be drawn from the battery without the terminal voltage dropping below 8.75 V?
Saturday, February 23, 2013 at 8:03pm by Don

Math
I = E/R A car has a 12 volt battery. The engine has a resistance of 0.22 ohms. How many amps will be drawn from the battery when the key is turned? I (to the nearest hundredth) = amperes
Monday, June 17, 2013 at 3:17pm by bob

math
Solve by setting up the proper equation to describe the facts given and then carrying out the mathematical calculations to solve for the unknown variable(s). Three batteries are connected in series so that the total voltage is 54 volts. The voltage of the first battery is ...
Friday, July 6, 2012 at 12:21pm by kenny

physics
Suppose a battery output a voltage of 9 volt. Calculate how many joules of energy are imparted to every individual electron moving through this battery?
Wednesday, May 22, 2013 at 1:49am by Abhijit

calculus
A competing technology uses a photovoltaic cell to charge a battery which can then be used to power a LED light. To compare these technologies, we make some reasonable assumptions. We assume the solar cell is 10 cm on a side, and that it has an efficiency of 15%. We assume the...
Wednesday, December 18, 2013 at 3:57pm by Danny Simone

chemistry
A competing technology uses a photovoltaic cell to charge a battery which can then be used to power a LED light. To compare these technologies, we make some reasonable assumptions. We assume the solar cell is 10 cm on a side, and that it has an efficiency of 15%. We assume the...
Wednesday, December 18, 2013 at 5:34pm by Danny Simone

physics
A 2600-pF air gap capacitor is connected to a 9.0 V battery.If a piece of pyrex glass is placed between the plates,how much charge will then flow from the battery?
Monday, February 4, 2008 at 9:11pm by jenish

Science
A 6.0 volt battery is hooked up to a light bulb, whose resistance is 3.1 ohms. How many electrons would leave the battery per second? (Hint: 1 electron = 1.6E-19 C)
Monday, September 28, 2009 at 6:50pm by David

Calculus
An electrical circuit switches instantaneously from a 2 volt battery to a 20 volt battery 3 seconds after being turned on. Sketch on a sheet of paper a graph the battery voltage against time. Then fill in the formulas below for the function represented by your graph. For t &...
Saturday, February 5, 2011 at 11:51pm by Abigail

Physics
A circuit consists of a self inductor of L=0.003 H in series with a resistor R1=5 Ohm. Parallel to these is a resistor R2=10 Ohm. A battery of V0=9 volt is driving the circuit. Current has been running for 10 minutes. (a) How much energy (in Joules) is now stored in the self-...
Tuesday, April 9, 2013 at 2:44pm by abdul rahman

Physics
An uncharged capacitor is connected to the terminals of a 3.0 V battery, and 9.0 uC flows to the positive plate. The 3.0 V battery is then disconnected and replaced with a 8.0 V battery, with the positive and negative terminals connected in the same manner as before. How much ...
Wednesday, March 3, 2010 at 3:29am by JOTHEY

Gen Chem II
You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume that the entire battery charge is useable for electroplating. You get ...
Monday, November 18, 2013 at 10:25pm by kyle

Electricity
A battery is connected to the endpoints A and B of a homogeneous wire. Using an ammeter one finds that a current I = 1.5 A flows through the conductor. Then, the wire is bent in the form of a circle and the same battery is connected to points A and B. What is the current in ...
Monday, December 9, 2013 at 10:55pm by Anonymous

PHYSICS
An automobile battery has an emf of 12.6 V and an internal resistance of 0.0500 . The headlights together present equivalent resistance 5.60 (assumed constant). (a) What is the potential difference across the headlight bulbs when they are the only load on the battery? V (b) ...
Friday, September 6, 2013 at 12:29am by priya

Science!
What are the parts of a battery and how do they function? http://home.howstuffworks.com/battery.htm
Thursday, November 16, 2006 at 2:28pm by I REALLY NEED HELP!

physics
a battery with and emf of 12V and an internal resistance of 0.5 ohms, is connected in series to a resistor of 5.0 ohms. what is the terminal voltage (n V) of the battery?
Monday, April 12, 2010 at 6:12pm by mandy

physics
a 2 uF capacitor is connected in series with a 1.2 M ohms resistor and a 5 v battery for a long time. What is the current in the resistor 1s after disconnecting the battery?
Wednesday, November 23, 2011 at 7:20pm by JM

science-physics
a battery of 12v supplies a charge of 1000C to an electric device. how much work is done by the battery in moving the charge?
Monday, July 23, 2012 at 2:43pm by aisha

Physics
What is the emf of a battery with a 0.15 Ω internal resistance if the battery delivers 1.5 A to an externally connected 5.0 Ω resistor?
Monday, February 14, 2011 at 8:15pm by Adam

Chemistry
seriously, any help would be much appreciated. You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume that the entire battery...
Monday, November 18, 2013 at 11:09pm by kyle

physics
After a parallel-plate capacitor is charged by a battery, it is disconnected from the battery and its plate separation is increased. Which of the following statements is correct?
Friday, January 29, 2010 at 8:19am by Cal

A lamp connected to a battery lights up. If a second, identical lamp is connected to the battery in parallel, the current drawn from the battery will _____ , and compared to the original brightness of the first lamp, both lamps will be _____ . will the current increase and ...
Saturday, May 12, 2012 at 4:52pm by matthew

college physics
A certain 9-V battery measures 9.0 V with no load connected to it, but only 8.5 V when connected to a radio which draws 150 mA of current. What is the internal resistance of the battery?
Friday, April 9, 2010 at 5:24pm by Mike

physics - conceptual
Three identical capacitors are connected in series to a battery. If a total charge of Q flows from the battery, how much charge does each capacitor carry? A)9Q B)Q/3 C)Q D)3Q E)Q/9
Sunday, February 3, 2013 at 6:36pm by Liz

physics
A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing.
Wednesday, January 30, 2008 at 8:49pm by rick

Physics - Electricity
Three resistors (15, 20, 25 ohms in this order) are connected to a 13-V battery . The internal resistance of the battery is negligible. What is the voltage difference across the 20-Ω resistance?
Thursday, April 4, 2013 at 11:06am by Amy

Physics
By our sign conventions, if a battery is traversed in the actual direction of the current in it, what can you say about the sign of the change in electric potential (the battery’s terminal voltage)?
Sunday, June 5, 2011 at 9:28pm by John

Physics
Where does the energy from a battery come from? When you use the battery to run a flashlight where does the energy go?
Saturday, December 1, 2007 at 4:13pm by Anonymous

Chemistry
Sulfuric acid/ Lead Battery: -the electrodes for the battery are composed of Pb(s), PbO2, and/or PbSO4. What are the half reaction occuring at each electrode? include electrolysis of water: Process Anode/Cathode Initial Charging: Discharging Recharging
Saturday, April 26, 2008 at 5:18pm by sara

physics
Three resistors are connected to a 20 V battery as shown. The internal resistance of the battery is negligible. (a) What is the current through the 15 resistance? (b)What is the voltage difference across the 20 resistance?
Saturday, December 1, 2012 at 9:33pm by luz

Physics
A parallel-plate capacitor is charged by a battery and then the battery is removed and a dielectric of constant K is used to fill the gap between the plates. Inserting the dielectric changes the energy stored by a factor of A)2. B)1/K. C)1 (no change). D)K. E)K-1.
Sunday, February 3, 2013 at 6:38pm by Liz

Physics
Two resistances, R1 and R2, are connected in series across a 15-V battery. The current increases by 0.050 A when R2 is removed, leaving R1 connected across the battery. However, the current increases by just 0.025 A when R1 is removed, leaving R2 connected across the battery. ...
Thursday, February 21, 2013 at 2:36am by Elizabeth

Physics
Batteries are not perfect. Instead they have an "internal resistance, a catch all phrase which describes the internal chemical workings of the battery which prevents it from providing an unchanging voltage regardless ofnits load. A simple model of internal resistance attaches ...
Saturday, March 8, 2008 at 8:33am by jenish

physics
A 1.50-V battery supplies 0.244 W of power to a small flashlight. If the battery moves 2.53 1020 electrons between its terminals during the time the flashlight is in operation, how long was the flashlight used?
Sunday, February 17, 2013 at 9:40pm by taryn

physics
The emf of a battery is equal to its terminal potential difference: A) under all conditions B) only when the battery is being charged C) only when a large current is in the battery D) only when there is no curent in the battery E) under no conditions my answer: d, The chemical...
Tuesday, March 27, 2007 at 10:21am by susane

physics
if there is a circuit that has a battery and a lightbulb: will an electron have more electric potential energy on the positive side of the battery or negative side of the battery? - i think its same because conservation of energy. energy gained by electron on positive side is ...
Friday, February 13, 2009 at 11:26pm by stacey

Physics
A 12 V battery is connected to 5 mega ohm resistor and a 6 micro farad capacitor and an open switch. After how many seconds will the voltage across the resistor reach 9 V? Suppose the battery is replaced by 12 V ac with a frequency of 60 Hz.Calculate the Irms in the circuit
Saturday, May 23, 2009 at 6:04am by Sandhya

Science
When 2 resistors, R1 and R2 are connected in series across a 6V battery the potential difference across R1 is 4V. When R1 and R2 are connected in parallel to the same battery the current through R2 is 0.45 A. Find the values of R1 and R2. Thanks :)
Monday, April 8, 2013 at 2:25pm by Lisa

physics
An old battery with an emf of 9.0 V has a terminal voltage of 7.8 V when it is supplying a current of 1.5 mA. What is the internal resistance of the battery? 800 Ω 900 Ω 400 Ω 600 Ω
Monday, February 24, 2014 at 12:39pm by mercedes

electricity and electronics
a battery consists of 5 dry cells connected in series.if the voltage developed by each cell is 1.5 the total voltage developed by the battery is
Saturday, November 1, 2008 at 9:06am by meeko

Physics
A car owner forgets to turn off the headlights of his car while it is parked in his garage. If the 12.0-V battery in his car is rated at 150.0 A · h and each headlight requires 41.4 W of power, how long will it take the battery to completely discharge?
Thursday, February 7, 2013 at 5:00pm by Mayra

physics
When a capacitor are plugged into the battery, what happens to the Q(charge), potential difference, and C. It would have the same effect if two capacitors connected in parallel plugged into the battery
Sunday, August 15, 2010 at 7:35pm by blast

physics
A 24V battery of internal resistance of 10ohms is connected to a variable resistor. At what value of current drawn from battery the rate of heat produced by the resistor is maximum? Hence find its value.
Tuesday, March 16, 2010 at 12:33pm by Edwin

statistics
The life span of the battery pack is known to be Normally distributed with a mean of 250 hours and a standard deviation of 20 hours. How to find the percentage of the battery packs lasting more than 250 hrs.
Sunday, May 6, 2012 at 4:31pm by noe

Chemistry
In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery. Fe(s) + 2 NiO(OH)(s) + 2 H2O(l) Fe(OH)2(s) + 2 Ni(OH)2(aq) How many mole of Fe(OH)2, is produced when 3.70 mol Fe and 6.95 mol NiO(OH) react?
Monday, February 24, 2014 at 3:26pm by Grace

Physics EM
A battery with EMF 90.0 V has internal resistance R_b = 8.68 Omega. What is the reading V_v of a voltmeter having total resistance R_v = 485 \Omega when it is placed across the terminals of the battery? Express your answer with three significant figures. V_v =88.4V This is the...
Monday, March 10, 2008 at 7:50pm by Spencer

physics
When a capacitor are plugged into the battery, what happens to the Q(charge), potential difference, and C(do all of them increase?). would it have the same effect if two capacitors connected in parallel plugged into the battery
Monday, August 16, 2010 at 3:18am by blast

physics
An electric car accelerates for 7.2 s by drawing energy from its 430-V battery pack. During this time, 1700 C of charge pass through the battery pack. Find the minimum power rating of the car.
Wednesday, February 1, 2012 at 7:57pm by Mike

A battery with EMF 90.0 V has internal resistance R_b = 8.68 Omega. What is the reading V_v of a voltmeter having total resistance R_v = 485 \Omega when it is placed across the terminals of the battery? Express your answer with three significant figures. V_v =88.4V This is the...
Tuesday, March 11, 2008 at 7:31am by Spencer

math
The lifetime of a SuperTough AAA battery is normally distributed with mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random, what is the probability that the lifetime will be 34 hours or less?
Monday, November 26, 2012 at 9:46pm by Sav

Physics
Two 2.9-cm-diameter electrodes with a 0.15-mm-thick sheet of Teflon between them are attached to a 9.0 V battery. Without disconnecting the battery, the Teflon is removed. a) What are the electric field after the Teflon is removed?
Sunday, October 6, 2013 at 10:04pm by Leanna

physics 2
a certain 12v storage battery with an internal resistance of 12 ohms delivers 80 A when used to crank a gasoline engine. if the battery mass is 20 kg and it has average specific heat of 0.2 kcal/kg K. what is its rise in temperaure during 1 min of cranking the engine. assume ...
Thursday, February 20, 2014 at 4:44am by Anne

Math
The lifetime of a SuperTough AAA battery is normally distributed with mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random, what is the probability that the lifetime will be 25 hours or less? a. 0.7454 b. 0.6604 c. 0.2546 d. 0.3396
Sunday, August 7, 2011 at 7:55pm by Justina

Statistics
The lifetime of a certain smart phone battery has an unknown distribution with mean value of 8 hours and standard deviation of 2 hours. What is the approximate probability that the average battery lifetime of a sample of 36 batteries will exceed 8.1 hours?
Monday, December 12, 2011 at 10:06pm by jacob

Statistics
The lifetime of a certain smart phone battery has an unknown distribution with mean value of 8 hours and standard deviation of 2 hours. What is the approximate probability that the average battery lifetime of a sample of 36 batteries will exceed 8.1 hours?
Monday, December 12, 2011 at 10:10pm by jacob

physics
1.) Draw a set of 1.5-volt cells in a series circuit so that the total battery voltage is 9 volts. A.) how many cell does it take? B.) show polarity connection. C.) suppose you connected one of the cells in part (a) so that it was backwards. what would the voltage across the ...
Sunday, September 30, 2012 at 10:56am by nitz

physics
1.) Draw a set of 1.5-volt cells in a series circuit so that the total battery voltage is 9 volts. A.) how many cell does it take? B.) show polarity connection. C.) suppose you connected one of the cells in part (a) so that it was backwards. what would the voltage across the ...
Sunday, September 30, 2012 at 6:47pm by nitz

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