1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
larisa [96]
3 years ago
13

One deterrent to burglary is to leave your front porch light on all the time. If your local power utility sells energy at 17¢ pe

r kilowatt-hour, how much will it cost to leave the above lamp on for the whole week?
Physics
1 answer:
Natali [406]3 years ago
6 0
To be honest with you, there's not enough information here to calculate
the answer, because we don't know the power consumption of the front
porch light.  The best we can do is represent that as a variable ... pick a
catchy name for it, which will show up in the final answer, and then you
can 'plug in' (get it ?) whatever size light bulb you want to use over the
front porch.

OK.  First we have to give it a name.  I could use a single letter, but
that's what everybody else always does.  Remember ... this is going to
represent the power (watts) consumed by the front porch light when it's
turned on.  It's the symbol that means "Front Porch Light Power" wherever
you see it.  I could easily call it x or y or z, but I'm going to call it " FPLP ".

OK.  FPLP = power consumption of the light, in watts .

0.001 FPLP = power consumption of the light, in kilowatts (kW).

(1 week) · (7 day/week) · (24 hour/day) = 168 hours .

Energy = (power) · (time) = (0.001 FPLP) · (168 hr) = 0.168 FPLP kWhours

Cost = ($0.17 per kWh) · (number of kWh) = (2.86¢) · (FPLP) .

There it is !

For an example, if you use a 100-W bulb in the front porch light,
then FPLP=100 W.  If you leave it on 24/7 for a whole week, then
it's going to cost

        (2.86¢) · (FPLP) = (2.86¢) · (100 W)  =  $2.86
You might be interested in
Static electricity occurs when electrons build up and _________
EleoNora [17]
Static electricity<span> is a </span>buildup<span> of </span>electric<span> charges on objects. Charges </span>build up<span> when negative </span>electrons<span> are transferred from one object to another. The object that gives </span>up electrons<span> becomes positively charged, and the object that accepts the </span>electrons<span> becomes negatively charged. This can </span>happen<span> in several ways</span>
5 0
3 years ago
The device that is made up of many single slits that diffract light and form a diffraction pattern , is called
Sergeeva-Olga [200]

Gọi là máy quang phổ kế

7 0
2 years ago
Read 2 more answers
A 1000.0 kg truck accelerates from 20.0 m/s to 25.0 m/s over a distance of 300.0 m. What is the average net force on the truck?
choli [55]

Answer:

The average net force on the truck is 375 Newtons.

Explanation:

Using Newton's 3rd equation of motion, we have :

v^{2} - u^{2} = 2×a×s

where, v = final velocity = 25 m/s

u = initial velocity = 20 m/s

a = acceleration

s = distance traveled = 300 m

Using these values in the above equation, we get acceleration = 0.375 m/s^{2}

Using Newton's second law, we have:

F=m×a

where m = mass = 1000 kg

a= acceleration = 0.375 m/s^{2}

Putting values we have F=375 N

3 0
3 years ago
What is the average acceleration of a tennis ball that has an initial velocity of 6.0 m/s [E] and a final velocity of 7.3 m/s [W
Marizza181 [45]

Given :

The average acceleration of a tennis ball that has an initial velocity of 6.0 m/s.

and a final velocity of 7.3 m/s.

It is in contact with a tennis racket for 0.094 s

To Find :

The average acceleration of the tennis ball.

Solution :

We know, average acceleration is given by :

a_{avg}=\dfrac{Final \ velocity-Initial\ velocity}{Time\ Taken}\\\\a_{avg}=\dfrac{7.3-6.0}{0.094}\ m/s^2\\\\a_{avg}=13.83\ m/s^2

Therefore, average velocity is given by 13.83 m/s².

Hence, this is the required solution.

7 0
2 years ago
A crowbar makes our work easier by multiplying effort true or false​
OLEGan [10]

Answer:

True

Explanation:

A crowbar makes our work easier by multiply effort because it belongs to first class lever.

And first class lever makes work easier by multiplying the effort

6 0
3 years ago
Other questions:
  • A rigid dam is composed of material of SG = 5 . The dam height is 20 m . What is the minimum thickness b of the dam necessary to
    14·1 answer
  • A negatively charged rubber rod can pick up small, neutrally charged pieces of paper by a process called
    6·1 answer
  • Help please number 8 an 9
    7·1 answer
  • Is a broom an example of a wedge?
    11·1 answer
  • As long as the net force on a falling object is not zero, the object will...
    15·1 answer
  • a 10kg ball is thrown into the air. it is going 3m/s when thrown. How much potential energy will it have at the top?
    14·1 answer
  • Which of the following best defines the science of separating color wavelengths?
    5·2 answers
  • Jupiter, the largest planet in the solar system, has an equatorial radius of about 7.1 x 10^4km (more than 10 times that of Eart
    13·1 answer
  • 3. Automobile companies often test the safety of cars by putting them through crash tests to observe the integrity of the passen
    15·1 answer
  • a city government received a $1 million grant to build swimming pools and skating rinks for youth. based on the data provided in
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!