LAMP

361 results

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 ...

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?

English

1. The fluorescent lamp is over the desk. 2. An ant is beneath the table. 3. The cat is under the table. 4. A book is on the table. ----------------------- Does #1 mean that the fluorescent lamp is right above the table? If the fluorescent lamp is in the corner and the lamp is...

science

What can be concluded if the family finds out the lights in the bathroom work, but the floor lamp and tv set still do not work? 1. The electrical service to the cabin has not gone off. 2. The bathroom lights are on the same circuit as the floor lamp and tv set. 3. The floor ...

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?

electronics and circuits

A battery in combination with a dependent current source is connected to a lamp in the circuit shown below in Figure 6-1. The battery is modeled as a voltage source in series with a resistor, Rbat, and has an open circuit voltage of 4V. The lamp turns on if the voltage across ...

science

Does the temperature of the water affect the reaction of a lava lamp? Does the size of the bottle affect how many blobs are produced of a lava lamp? Does the effect still work if the cap is put on the bottle of a lava lamp? Does the size of the tablet pieces affect the number ...

science

Does the temperature of the water affect the reaction of a lava lamp? Does the size of the bottle affect how many blobs are produced of a lava lamp? Does the effect still work if the cap is put on the bottle of a lava lamp? Does the size of the tablet pieces affect the number ...

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...

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...

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.

math

A lamp shade is in the form of a frustrum of a cone the button ra duis is thrice the top raduis and the height is 14cm the volume of the lamp shade is 763cm find the button of the raduis , the area of the clothes to cover the lamp shade

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

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

Physics 1014

A large bowl contains water 10cm deep and has a small electric 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 ...

science

An electric lamp rated at 48w,12-v supply. Calculate the current flowing in the lamp and the resistance

math

A lamp that normally sells for $35 is on sale for 35% off. How much will the lamp cost after a 8% sales tax?

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 ...

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? ...

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 ...

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 ...

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 ...

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 ...

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

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

physics

an operating 100-watt lamp is connected to a 120-volt outlet. what is the total energy used by the lamp in 60. seconds

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...

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 ...

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.

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, ...

Physics

On a flat golf course, a golf ball lies 12m from the base of a lamp post. A golfer hits the ball with a club, giving the golf ball an initial velocity of 18 m/s. At 2.9 seconds, after being hit, the golf ball strikes the top of the lamp post. How high (m) is the lamp post?

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.

calc

a man 6 feet tall is walking away from a lamp post at the rate of 60 feet per minute. when the person is 6 feet from the lamp post, his shadow is 12 feet long. find the rate at which the length of his shadow is increasing when he is 145 feet from the lamp post

Math

In a certain 25-W mercury-vapor ultraviolet lamp, 0.1% of the electric energy input appears as UV radiation of wavelength 2537 AËš . What is the UV photon emission rate per second from this lamp?

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.

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?

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?

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.

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?

Physics

A 100-watt lamp glows brighter than a 25-watt lamp. What do you know about the resistances of these two lamps?

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 ...

Chemistry

A 32 W (1 W = 1 J/s) lamp generates violet light at a wavelength of 420 nm. How many photons of this light will the lamp generate in 2.0 s?

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

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.

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.

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?

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.

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?

physics

What is the total resistance in a parallel circuit with a 10 ohm lamp and a 15 ohm lamp?

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 ...

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?

math

Jessica buys a lamp that costs $35 and a table that costs $75.00. If the tax rate is 10%, what will be the total cost of the lamp. I know is not 110, is between. A #117, B $118, C $119, D $120, E $121, Can somebody help me.

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.

Physics

A 24V lamp has a resistance of 8.0 ohms. What resistance must be placed in series with the lamp if it is to be used in a 117V line? I think I understand how resistors work but this HW question is completely over my head..

math

if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp

math

if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp

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?

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?

math

A merchant marks a certain lamp up 30% above cost.then he gives a customer a 15% discount.if the final selling price of the lamp was $99,what was the approximate cost price?

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 ...

math

Jessica buys a lamp that costs $35 and a table that costs $75.00. If the tax rate is 10%, what will be the total cost of the lamp and table?

math

Jessica buys a lamp that costs $35 and a table that costs $75.00. If the tax rate is 10%, what will be the total cost of the lamp and table?

steve reiny proportion help maths reiny!!!

The illumination of a small object by a lamp varies directly as the candle-power of the lamp and inversely as the square of the distance between the lamp and the object.If a light-bulb of 8 candle power,fixed 150cm above a table,is replaced by a 5 candle power bulb,how far ...

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.

sir steve damon reiny steve help maths

A street lamp is 6m above a straight road.A Man 2m tall.walks along the road away from the lamp at a constant speed of 1.5m/s.At what rate is his shadow lengthening?

Science

A switch is closed, a lamp turns on. The switch opened, and the lamp turns off. What does that suppose to mean..?

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? ...

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...

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.

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?

science

Which of the following statement best describes the two different types of electrical energy involved in the situation above? 1.Both the lightning and the electricity used to light the floor lamp are forms of static electricity. 2. Both the lightning and the electricity used ...

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?

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).

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.

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.

College Algebra

A 6 ft tall man is standing 40 feet from the light post, if his shadow is 20 feet, determine the height of the lamp. Here I use simple ratios: 40ft + 20ft = 60ft 6/20 = h/60 Cross multiply both sides with 60: 6 (60)/20 = h 360/20 = h h = 18 Height of the lamp is 18ft. P.S. Is ...

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.

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..

math

A man who is 1.6 m tall is walking on the road at a constant speed of 1 m/s. There is (only) one lamp placed 3.2 m above the road. At a specific moment the man was just under the lamp. What will be the rate at which the length of his shadow will be changing after: a) 2 sec b) ...

math

A man who is 1.6 m tall is walking on the road at a constant speed of 1 m/s. There is (only) one lamp placed 3.2 m above the road. At a specific moment the man was just under the lamp. What will be the rate at which the length of his shadow will be changing after: a) 2 sec b) ...

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 ...

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 ...

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 ...

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?

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?

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?

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?

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?

Science

An existing cord that you use for a lamp is much thinner than an extension cord recommended for use with large appliances. if u plugged in a refrigerator using a lamp extension cord, the plastic coating of the cord could melt and perhaps start a fire. why does this occur? how ...

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'?)

physics

filament lamp: cost-80p efficiency-0.2 expected life- 1000 hours compact fluorescent lamp (CFL): cost- £3.00 efficiency-0.8 expected life- 8000 hours A filament lamp with a power rating of 100 w gives 2000 units of light. what power rating would a CFL need to provide 2000 ...

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?

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?

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 ...

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...

physics

Two 1.30-V batteries-with their positive terminals in the same direction-are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.182Ω, the other an internal resistance of 0.139Ω. When the switch is closed, a current of ...

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 ...

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

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

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...

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