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Airida [17]
3 years ago
6

A 2-kW electric heater takes 15 min to boil a quantity of water. If this is done once a day and power costs 10 cents per kWh, wh

at is the cost of its operation for 30 days?
Physics
1 answer:
frozen [14]3 years ago
4 0

Answer:

<h2> $1.50</h2>

Explanation:

Given data

power P= 2 kW

time t= 15 min to hours = 15/60= 1/4 h

cost of power consumption per kWh= 10 cent = $0.1

We are expected to compute the cost of operating the heater for 30 days

but let us computer the energy consumption for one day

Energy of heater  for one day= 2* 1/4 = 0.5 kWh

the cost of operating the heater for 30 days= 0.5*0.1*30= $1.50

<u><em>Hence it will cost  $1.50 for 30 days operation</em></u>

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A sprinter runs 50m. You are given a stopwatch. Describe how you would measure: 1. the average speed of the sprinter over the en
Oksanka [162]

Answer:

Explanation:

Distance = 50 m

1. To find the average speed, first start the stop watch as the sprinter starts running and then stop it when he reaches the finish line.

Now note the time taken by the sprinter to run for 50 m.

The average speed of the sprinter is defined as the ratio of total distance covered to the total time taken.

Average speed = total distance / total time

2. To find the instantaneous speed, check the seed of the sprinter as he is at the finish line.

6 0
3 years ago
3 points
blagie [28]

Answer:

A and D

Explanation:

Acceleration is the active change in speed, increasing or decreasing.

8 0
3 years ago
What happens when electrical devices are added to the circuit ?
Ksivusya [100]

Answer:

they get power.

Explanation:

7 0
3 years ago
During a 40-mile trip, Marla traveled at an average speed of x miles per hour for the first y miles of the trip and at an averag
Ilya [14]

Answer:

\dfrac{32+0.2y}{40}

Explanation:

Total =40 miles.

y miles at x miles/hr.

40- y miles at 1.25 x miles/hr.\

We know that

Distance = time x velocity

For y miles

Lets time taken to cover y miles is t

y = x t

t=y/x                -----------1

For 40- y

Lets time taken to cover 40- y is t'

40- y = 1.25 x t'  

t'=(40-y)/1.25x           -----------2

By adding both equation

t+t'=y/x  + (40-y)/1.25x

t+t'=(32+0.2y)/x

Now lets time T taken by Marla if she will travel at x miles per hr for entire trip.

40 = x T

T=40/x

So

\dfrac{t+t'}{T}=\dfrac{32+0.2y}{40}

To find numerical value of above expression we have to know the value of y.

8 0
4 years ago
A brick is dropped from a high scaffold. <br> a. How far does the brick fall during this time?
Alecsey [184]

Answer:

a: after 1 seconds it will have fallen 0.2452

after 2 seconds it will have fallen 0.981

after 3 seconds it will have fallen 2.2072

after 4 seconds it will have fallen 3.924

Explanation:

the formula for acceleration due to gravity is (ignoring friction I think)

g = G*M/R^2

earths gravitational constant is about 9.807

g = 9.807*M/R^2

The average weight of a brick is 5 pounds and I'm going to say it's 10 feet off the ground.

g = 9.807*5/10^2.         g = 0.4905 so every second the brick will go 0.4905 fps faster. (fps means feet per second.)

after 1 seconds it will have fallen 0.2452

after 2 seconds it will have fallen 0.981

after 3 seconds it will have fallen 2.2072

after 4 seconds it will have fallen 3.924

6 0
3 years ago
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