Science

Similar Questions

1. Mathematics

   the cost of operating an appliance varies jointly as the number of watts drawn, the hours of the operation and the cost per kilowatt-hour. At P8.99 per kilowatt-hour, how much would it cost when a 70-watt desk fan operates for 2

2. algebra

   The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the

3. algebra

   The light intensity of a light bulb varies inversely as the square of the distance from the light bulb. The function I(d) = k/d^2 models this situation, where I is the light intensity, d is the distance from a light source, and k

4. Science

   An electric light is plugged into a 120-V outlet. If the current in the bulb is 0.5 A, how much electrical energy is used by the bulb in 15 minutes?

1. Optics

   The famous Chinese magician Foo Ling Yu performs a classic magic trick using a concave mirror with a focal length of 1.6 m. Foo uses the mirror to produce an image of a light bulb that is the same size as the light bulb itself and

2. Energy question

   How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?

3. physics

   At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?

4. English

   Which of the following statements in a research paper would need citation? A. Washington, D.C. is the capital of the United States. B. The landing on the moon is one of the most exciting events in recent history.*** C.

1. Math

   A fly starts out 2 meters from a light bulb, flies closer to the light then farther away, 2 meters again. At this point the fly goes toward the bulb again but hits the bulb and flies away. Find a function (it may be piecewise)

2. Physics

   A special kind of light bulb emits monochromatic light of wavelength 630 nm. Electrical energy supplied to it at the rate of 60W, and the bulb is 93% efficient at converting that energy into light energy. How many photons are

3. Physics

   A 100-Watt light bulb plugged into a 120-Volt outlet is left on for 60 seconds. How much energy (in Joules) is used up by the bulb during this time?

4. math

   Power companies typically bill customers based on the number of kilowatt-hours used during a single billing period. A kilowatt is a measure of how much power (energy) a customer is using, while a kilowatt-hour is one kilowatt of

You can view more similar questions or ask a new question.