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December 21, 2014

Search: LAMP

Number of results: 275

Physics
A 100 W lamp is connected to 120 V, and its current is measured. A resistor is added to the lamp to reduce the current to half its original value. (a) What is the potential difference across the lamp? (b) How much resistance was added to the circuit? (c) How much power is now ...
April 14, 2013 by Billy

Math 8R - HELP!!!!!
Mr. Martanarie bought a new lamp and lamppost for his home. The pole was 6 5/8 ft tall and the lamp was 1 1/4 ft in height. How tall were the lamp and post together?
September 27, 2012 by Laruen

physics
The lowest resistance in a common electric circuit containing a common lamp is in which of these A) connecting wires.B) Both of these.C) Neither of these.D) lamp filament. I would say lamp filament is this correct?
April 14, 2012 by Christy

physics
A 37 ohm lamp and a 59 ohm lamp are connected in series and placed across a potential of 43 V. What is the equivalent resistance of the circuit? What is the current in the circuit? Answer in units of A. What is the voltage drop across the first lamp? Answer in units of V. What...
April 27, 2011 by Leslie

physics
A lamp which is 9.0 cm tall is in front of a concave mirror which has a focal length of 53.0 cm. (a) How tall is the lamp's image if the lamp is a distance of 26.5 cm from the mirror (include sign if negative)? (b) How tall is the lamp's image if the lamp is a distance of 63.6...
January 17, 2013 by m

calculus
A person 150cm tall is walking away from a lamp post at the rate of 15 meter per minute. when the man is 2.5m from the lamp post, his shadow is 3m long. Find the rate at which the length of the shadow is increasing when he is 7m from the lamp post.
April 18, 2014 by nurul

physics
There are electrons in the filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from A) the positive charges that flow in the filament.B) the same electrons.C) different electrons; the ones that flow in the circuit to your lamp
April 13, 2012 by Jim

physics
There are electrons in the filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from A) the positive charges that flow in the filament.B) the same electrons.C) different electrons; the ones that flow in the circuit to your lamp
April 14, 2012 by Jim

Physics
A motorcycle is travelling at a constant acceleration in a straight line. When it passes by the first lamp post, it is travelling at 10ms-1. When is passes by the next lamp post which is 200m from the first lamp post, the motor cycle is travelling at 16 ms-1. What is the ...
June 27, 2014 by Ashley

Physics
A 37 ohm lamp and a 59 ohm lamp are connected in series and placed across a potential of 43 V. What is the equivalent resistance of the circuit? Answer in units of ohm. What is the current in the circuit? Answer in units of A. What is the voltage drop across the first lamp? ...
April 28, 2011 by Maria

Math
For 5 consecutive days, the price of a lamp in jill's store is reduced by 10% from the previous day's price. At the end of the fifth day, by what percetage will the price of the lamp have been reduced from its initial price? I'm not sure where to begin since I don't know what ...
February 10, 2010 by Joe

science
Minska has a problem. When she turns on a lamp, the lamp doesn't light. She wonders if the lamp is plugged into the outlet. She checks the outlet and discovers that it is plugged in. Which stage of the scientific method is Minska in when she looks at the outlet? a) a problem ...
September 6, 2010 by ant

science
Minska has a problem. When she turns on a lamp, the lamp doesn't light. She wonders if the lamp is plugged into the outlet. She checks the outlet and discovers that it is plugged in. Which stage of the scientific method is Minska in when she looks at the outlet? a) a problem ...
September 6, 2010 by ant

science
Minska has a problem. When she turns on a lamp, the lamp doesn't light. She wonders if the lamp is plugged into the outlet. She checks the outlet and discovers that it is plugged in. Which stage of the scientific method is Minska in when she looks at the outlet? a) a problem ...
September 6, 2010 by Happy Labor Day!!!!

English
"I have but one lamp by which my feet are guided; and that is the lamp of experience." This is an example of a. an appeal to authority b. allusion c. conceit d. logic C? Thanks
May 18, 2012 by mysterychicken

physics
An electrical source with internal reistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?(a)R+r/R(b)R-r/R (c)R/R+r (d)R/r
September 15, 2013 by Roy

FSK 114 (PHYSICS)
A LARGE BOWL CONTAINS WATER 10cm DEEP AND HAS A SMALL ELLECTRIC LAMP AT THE BOTTOM.A DISC OF CARDBOARD IS FLOATING ON THE SURFACE WITH ITS CENTRE VERTICALLY ABOVE THE LAMP, AND IS OF SUCH DIAMETER THAT THE LAMP CAN JUST NOT BE SEEN BY A PERSON LOOKING INTO THE WATER. CALCULATE...
April 13, 2011 by Limema

physics 102
three lamps connected to a 120-V AC (rms) household supply voltage. Lamps 1 and 2 have 75.0-W bulbs; lamp 3 has a 40.0-W bulb. (a) For each bulb, find the rms current. Irms, lamp 1 = A Irms, lamp 2 = A Irms, lamp 3 = A (b) For each bulb, find the resistance. Rlamp 1 = Ω ...
August 9, 2012 by Matt Will

physics
A 50 ohm lamp and a 10 ohm electric iron are connected in series to a generator delivering 120 V. The current through the lamp and the iron is ___ The voltage ccross the lamp is ___ The voltage drop acrowss the iron is ___ How do I set these up? Thank you.
May 18, 2011 by Kriti

Physics - electricity
An incandescent lamp is marked '120v,75W' a)what is the current in the lamp under normal condition of operation? b)How much does it cost per hour to operate the lamp if the price of electrical energy is $6.00 per unit? Please stop posting under different names. Use ohms law, ...
April 17, 2007 by Charles

ipc
investigate and compare economic and environmental impacts of incandescent light bulbs versus the various fluorescent lamps, solar lamp, and oil burning lamp or candles.
April 13, 2011 by poo

Math
In a certain 25-W mercury-vapor ultraviolet lamp, 0.1% of the electric energy input appears as UV radiation of wavelength 2537 A˚ . What is the UV photon emission rate per second from this lamp?
April 13, 2014 by Nam-kung hoon

physics
A lamp is moved from 26 cm to 90 cm above the pages of a book. Compare the illumination on the book before and after the lamp is move.
May 12, 2008 by marc

Science
A lamp is suspended by a massless string from the ceiling of a descending elevator which decelerates at 1.6 m/s2. If the tension in the string is 82.0 N, what is the mass of the lamp?
October 25, 2011 by Mark

math
A girl 1.6 m tall, stands 3.6 m from a lamp post at night. Her shadow from the light is 0.9m long. How high is the lamp post?
March 20, 2013 by Chris

Physics
A 100 watt lamp glows brighter than a 25 watt lamp. What do you know about the resistences of these two lamps. How can you increase their power.
April 4, 2009 by Michael

physics
A 75.0-W lamp is placed in series with a resistor and a 120.0-V source. If the voltage across the lamp is 24 V, what is the resistance R of the resistor?
October 11, 2011 by ashley

Physics
A 100-watt lamp glows brighter than a 25-watt lamp. What do you know about the resistances of these two lamps?
June 24, 2013 by Anonymous

Science please help!
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 ...
May 12, 2012 by matthew

math
A man is 6ft tall is standing 10 feet from the base of a lamp post. The mans shadow has a lenght of 4ft . How tal is he lamp post
January 31, 2011 by jake

Math (grade 10)
On the design plan for a garden, a straight path suns from (-25,20) to (40,36). A lamp is going to be placed at the midpoint of the path. Determine the coordinates for the lamp.
May 28, 2012 by Shellie

math
A woman 5 ft tall is standing near a street lamp that is 12 ft tall. Find a function that models the length L of her shadow in terms of her distance d from the base of the lamp.
October 9, 2009 by David

CALCULUS
A cat walking down the street at a speed of 1 1m/s passes 2 m from a post on which there is a lamp 6 m above the ground. How fast is the distance between the cat and the lamp increasing 3 s later?
April 15, 2013 by rim

math
A boy of height 95 cm is walking away from base of a lamp post at a speed of 1.5 m/s.If the lamp post is 3.8 m above the ground, find the length of his shadow after 5 seconds.
September 25, 2014 by sherry

math
if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp someone helped with this earlier (steve) but I still don't understand how you got your answer...can you please explain further?
November 4, 2012 by karin

physics
What is the total resistance in a parallel circuit with a 10 ohm lamp and a 15 ohm lamp?
May 24, 2010 by maryanne

Physics
A street lamp weighs 150 N. It is supported by two wires that form an angle of 100 with each other. The tensions in the wires are equal. (a) What is the tension in each wire supporting the street lamp? (b) If the angle between the wires supporting the street lamp is reduced ...
November 17, 2012 by Lyna

Physical Science
Turn an incandescent lamp on and off quickly while you are standing near it. You feel it's heat, but you find when you touch the bulb that it is not hot. Explain why you felt the heat from the lamp?
March 10, 2008 by Rachel

Calculus
A man is 6ft tall and is walking at night straight toward a lighted street lamp at a rate of 5 ft/sec. If the lamp is 20 ft above the ground, find the rate at which the length of his shadow is changing.
February 28, 2013 by Trevor

math
if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp
November 4, 2012 by karin

math
if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp
November 4, 2012 by karin

Physics
A lamp fimament is made of tungsten. Why do we get a continuous spectrum rather than a tungsten line spectrum when light from an incandescent lamp is viewed with a spectroscope?
March 27, 2008 by Leigh

Physic
A lamp filament is made of tungsten. Why do we get a continuous spectrum rather than a tungsten line spectrum when light from an incandescent lamp is viewed with a spectroscope?
December 11, 2012 by shelly

scinence
Minska has a problem. When she turns on a lamp, the lamp doesn't light. She wonders if the lamp is plugged into the outlet. She checks the outlet and discovers that it is plugged in. After Minska concludes that her explanation didn't fit the evidence, what would be her next ...
September 6, 2010 by Happy Labor Day!!!!!!!!!!!

Physics
This question makes no sense to me. . . A 100-watt lamp glows brighter than a 25-watt lamp. What do you know about the resistances of these two lamps? ???? That they have different watts...thats all I can think of. Physics is not my strong subject.
October 26, 2007 by Michele

Physics
Capacitors are used in many applications where you need to supply a short burst of energy. A 143 μF capacitor in an electronic flash lamp supplies an average power of 12.6 kW to the lamp for 2.95 ms. To what potential difference must the capacitor initially be charged? ...
January 31, 2012 by Ashley

Physical Science: Series Circuit
There is a circuit of 2 lamps in a series. If a voltage of 6 volts is impressed across the circuit and the voltage across the 1st lamp is 2 volts, what is the voltage across the second lamp? Defend your answer I want to say that the second lamp has a voltage of 4 volts as well...
October 5, 2009 by Britney

math
A lamp pole 12ft high shines on a person and casts a shadow 8ft long. If the person is 10ft from the lamp pole, calculate the person's height.
May 26, 2011 by Mani

Physics
A lamp is 4m from wall. Calculate the focal length of a concave mirror which forms a five time magnified image of lamp on wall. How far from wall must the mirror be placed?
January 22, 2014 by Sykox

Calculus
Suppose a 6ft. man is 10 ft. away from a 24 ft. tall lamp post. If the person is moving away from the lamp post at at rate of 2 ft/sec, at what rate is the length of his shadow changing?
March 14, 2011 by Anonymous

physics
A person wants to push a lamp (mass 7.2 kg) across the floor, for which the coefficient of friction is 0.23. Calculate the maximum height above the floor at which the person can push the lamp so that it slides rather than tips (Fig. 9-62).
October 21, 2012 by Olivia

math
A LAMP POST IS 10 FEET TALL AND CAST A SHADOW. THE DISTANCE FROM THE TOP OF THE LAMP POST TO THE TIP OF THE SHADOW IS 20 FEET. FIND THE ANGLE OF THE ELEVATION.
August 12, 2014 by BRANDI

Math
At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.
September 15, 2014 by Irina

pre-calculus
At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.
September 15, 2014 by Anonymous

Physics
Current flow through a lamp is 1.3 A. How many Coulombs of charge are passed through the lamp in 2 minutes? Formula for coulombs and current? Not sure..
February 3, 2013 by Physics fail

to ms.sue- writing project
what i wrote: every monday, my aunt would come and visit me.everytime my aunt visits me, she would always have something special for me. This monday was different.when my aunt came to visit me today, she was holding a huge box. I heard strange noises coming from it.I heard ...
July 27, 2012 by Celest

physics! HELP!
A filament lamp- cost- 80p effiency- 0.2 expected life- 1000 hours a compact fluorescent lamp (CFL)- cost- 3.00 effiency- 0.8 expected life- 8000 hours a filament lamp with a power rating of 100W gives 2000 units of light. what power rating would a CFL need to provide 2000 ...
February 29, 2012 by 4611star

physics
1A) A filament lamp- cost- 80p effiency- 0.2 expected life- 1000 hours a compact fluorescent lamp (CFL)- cost- 3.00 effiency- 0.8 expected life- 8000 hours a filament lamp with a power rating of 100W gives 2000 units of light. what power rating would a CFL need to provide ...
February 29, 2012 by 4611star

physics
A lamp hangs vertically from a cord in a descending elevator that decelerates at 2.6 m/s2. (a) If the tension in the cord is 54 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 2.6 m/s2?
October 4, 2011 by Rebekah

Physics
A lamp hangs vertically from a cord in a descending elevator that decelerates at 2.9 m/s2. a) If the tension in the cord is 94 N, what is the lamp's mass? b)What is the cord's tension when the elevator ascends with an upward acceleration of 2.9 m/s2?
October 8, 2012 by Aalaa

Pre Calc
Dr. Black is standing 15 feet away from the street lamp. The lamp is making his shadow 8 feet long. The angle of elevation from the tip of the shadow to the tip of the streetlamp is 50 degrees. How tall is the streetlamp?
January 26, 2011 by Anonymous

math
a radio uses one-third the number of watts used by lamp, and a heater that uses 15 times as many watts as a lamp. when all are in use, the total electrical power is 1.1 kilowatts how many does the radio use?
September 23, 2014 by sara

Physics
A lamp (R = 151 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 121 V line. What total current is supplied to the circuit? What is the voltage across the fan? What is the current in the lamp? What power is expended in the heater?
October 4, 2010 by chuck

English
He won first prize for the solar lamp in the science fair. (What is the meaning of 'for' in the sentence? Is 'for the solar lamp' an adjective phrase modifying 'prize' or and adverbial phrase modifying 'won'?)
October 31, 2013 by rfvv

physics
Two chains of length 1.0m are used to support a lamp the distance between the two chains along the ceiling is 1.0m. what is the vertical distance from the lamp to the ceiling?
May 23, 2012 by Carri

math
A man 6 feet tall walks at a rate of 5 feet/sec toward a street lamp that is 16 feet above the ground. At what rate is the tip ,of his shadow moving? At what rate is the length of his shadow changing when he is 10 feet from the base of the lamp post?
October 8, 2012 by Prabhakaran

physics
A student wants to compare the luminous flux of a light bulb with that of a 1675 lm lamp. The light bulb and the lamp illuminate a sheet of paper equally. The 1675 lm lamp is 1.28 m away from the sheet of paper; the light bulb is 1.08 m away. What is the light bulb's luminous ...
January 23, 2014 by Felicia

Physics
A lamp hangs vertically from a cord in a descending elevator with a constant deceleration a. If the tension in the cord is T0, answer the following. (Use any variable or symbol stated above along with the following as necessary: g.) (a) What is the lamp's mass? m = (b) What is...
February 11, 2013 by Rachel

physics
It is desired to move a small, 50 kg cat in outer space by strapping a lamp, which emits 100 W of blue light to it. If the cat is free in space, and the wavelength of blue light is 470 nm, what would be the acceleration of the cat? (HINT: Consider how many photons are emitted ...
January 22, 2012 by Anonymous

Math
Brenda wants to attatch a string of beads along the circular bottom edge of a lamp shade shown below. The diameter of the bottomof the lamp shade is 18 centimeters. About how many centimeters long should Brenda make the string of beads? a.25 cm b.79 cm c.56 cm d.201 cm
April 15, 2009 by Hailey

Trig/Precalc
a lamp post that is 8 feet high casts a shadow 5 feet long. how tall is the person standing beside the lamp post if his shadow is 3.5 feet long
November 24, 2013 by Marusa

Algebra II
The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a 74.0 w lamp 8.00 ft from the desk, what size lamp...
November 21, 2011 by Zach

Algebra II
The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a 74.0 w lamp 8.00 ft from the desk, what size lamp...
November 22, 2011 by Ashley

Algebra II
The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a 74.0 w lamp 8.00 ft from the desk, what size ...
November 22, 2011 by Marie

Math
The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a 74.0 w lamp 8.00 ft from the desk, what size lamp...
November 22, 2011 by Jake

writing project
Your aunt arrives with a huge box. You hear strange noises coming from the box. Write a story about whats inside. what i wrote: every monday, my aunt would come and visit me.everytime my aunt visits me, she would always have something special for me. This monday was different...
August 7, 2012 by Celest

Physics
Suppose that one oscillation of a swinging lamp takes 5.5s. What maximum speed does the lamp have if its maximum angle from vertical is 3.0degrees? I first found L to be 7.51m. That was right. Now, I calculated the angular frequency of the pendulum to be 1.14. I'm pretty sure ...
November 13, 2008 by Samantha

Calculus
(It's a related rate question) A man 6ft tall walks away from a lamp post (15ft) at 5ft/sec. How fast is his shadow lengthening? --- I have the picture, and the constants, the man and the lamp post. I have 5ft/sec as dw/dt, and I know I'm looking for ds/dt, the rate of the ...
September 12, 2010 by Nikki

physics
Eva is in a closed, dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light heats her hand. The light bounces off the pages of a book and into her eyes. If this room is a closed system, what happens to the total amount of ...
March 29, 2014 by Help

maths
1 ) Lamp posts,dust bins and benches are paced at intervals of 70 m ,56 m ,and 84 m respectively along a strech of road 8km long.At start of the road,lamp post,dust bin and bench are placed together.Only when the three objects are all placed together,they are painted blue. How...
April 16, 2008 by MTH

Physics
The brakes on a parked car fall and it accelerates at a constant rate, rolling into a lamp post down the hill. the car reaches a velocity of 4.3m/s by the time it smashes into the lamp post. The time between the brakes failing and the smashing of the car is 3.7s. A. what is ...
April 18, 2011 by ron

phy
(Q1)the temperature at which the tungsten filament of a 12v and 36w lamp operates is 1730c.If the temperature coefficient of resistance of tungsten is 0.006/k, find the resistance of the lamp at room temperature of 20c (a)10.00(b)0.45ohms(c)0.39ohms(d)4.00ohms (Q2)At what ...
July 3, 2013 by kate

yr 8 design technology
Systems and Control- inputs ,process and outputs 1) public address system - input ? 2)table lamp - process ? 3) street lamp - input ? 4)burgular alam - process? 5)doorbell-output-doorbell sounds (ding dong is this right?) 6)car windscreen - input-? 7)refrigerater- output- cold...
January 10, 2009 by Ashkin

Health Physics
1. Two blocks of mass 0.1 kg and 0.2 kg approach each other on a frictionless surface at velocities of 0.4 and 1 m/s respectively. If the blocks collide and remain together, calculate their joint velocity after the collision. 2. A cyclotron produces a 100-μA beam of 15-MeV ...
April 13, 2014 by Nam-kung hoon

physical science
the headlamp and 2 identical tail lamp are conected in paralel to batery with unknown internal resistancs.headlamp resistance wth 2.4 ohm controld by switch s1.the tail lamps are controled by s2.the resistance of the connection wired may be ignored. questions:1.determine the ...
January 16, 2012 by queen

physics
A lamp hangs vertically from a cord in a descending elevator that declerates at 2.4m/s^2 a) if the tension in the cord is 89N what is the lamp's mass? b) what is the cord's tension when the elevator is ascends with an upward acceleration of 2.4m/s^2? I know T=w where w=mg. ...
November 13, 2006 by Chris

Physics
what is the illumination if a lamp of 504 lm lights a distance 4.0 m below it?
April 10, 2013 by DeaNiqua

physics!!!!!!!
In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds the paper above the floor, measures the distance between the hole and the floor, and finally measures the length of the light's image on the floor. ...
February 12, 2013 by please help me out!!! please

physics!
In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds the paper above the floor, measures the distance between the hole and the floor, and finally measures the length of the light's image on the floor. ...
February 14, 2013 by please help me out!!!!

Physics
In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds the paper above the floor, measures the distance between the hole and the floor, and finally measures the length of the light's image on the floor. ...
February 16, 2013 by Tony

PHYSICS
In order to measure the length of a long flourescent ceiling lamp, a student makes a very small hole in a piece of paper, holds the paper above the floor, measures the distance between the hole and the floor, and finally measures the length of the light's image on the floor. ...
October 14, 2013 by steve

science
what is the indepenpent variable when i make a home made lava lamp
March 27, 2011 by iliana

science
i need to find a website that has a picture of hafnium lamp filaments
February 20, 2012 by dylan

physics
How many electrons pass through a lamp in 3 minutes.If the current is 300 ma?
July 6, 2014 by Anonymous

Finite with Calculus Applications
The Ball Company manufactures three types of lamps, labeled A,B,and C. Each lamp is processed in two departments, I and II. Total available work-hours per day for departments I and II are 400 and 600, respectively. No additional labor is available. Time requirements and profit...
February 27, 2012 by Andre

calculus
A lamp has a cost function of C(x) = 2500 + 10x, where x is the number of units produced per day and C(x) is in dollars. The revenue function for these lamps is R (X)= 18x−.001x^2. At least 100 lamps and no more than 2000 lamps may be produced per day. a. How many lamps ...
December 3, 2012 by michael

science
which appliance uses the larger current, a toaster or a desk lamp? Explain how you know.
April 29, 2009 by maria nguyen

PHYSICS 1A
how much current is drawn by a lamp that has a resistance of 1.2 O when a voltage of 6.8 V is impressed across it/
January 3, 2012 by ERICK BELTRAN

Physics
Will a cyclist coast farther if the lamp connected to his generator is turned off? Explain.
March 30, 2011 by Nikki

Physical Science
A lamp bulb is rated 100w. Why is a time factor not included in the rating?
September 9, 2014 by Barbara

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