Physics : asked on mandy9386
 24.05.2022

If you can. suppose a family replaces ten 60-watt incandescent bulbs with ten 30-watt fluorescent lamps. if each light was used for 4 hours per day and the cost of electricity was 10.0 ¢/kwh, how much money would they save in a year? explain your answer.

. 17

Step-by-step answer

17.02.2022, solved by verified expert
Unlock the full answer

Initially there were 10 bulbs of 60 Watt power

So total power of all bulbs = 60 * 10 = 600 W

now each bulb used for 4 hours daily

so total energy consumed daily

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

now we have total power consumed in 1 year

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

cost of electricity = 10 cents/ kWh

so total cost of energy for one year

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

Now if all 60 Watt bulbs are replaced by 30 Watt bulbs

So total power of all bulbs = 30 * 10 = 300 W

now each bulb used for 4 hours daily

so total energy consumed daily

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

now we have total power consumed in 1 year

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

cost of electricity = 10 cents/ kWh

so total cost of energy for one year

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

total money saved in 1 year

If you can. suppose a family replaces ten 60-watt, №15218348, 24.05.2022 02:20

It is was helpful?

Faq

Physics
Step-by-step answer
P Answered by PhD

Answer:

9.6 meters

Step-by-step explanation:

Time taken by the tomatoes to each the ground

using h = 1/2 g t^2 

t^2 = 2h/g = 2 x 50/ 9.8 = 10.2

t = 3.2 sec 

horizontal ditance = speed x time = 3 x 3.2 = 9.6 meters

Physics
Step-by-step answer
P Answered by PhD

The question specifies the diameter of the screw, therefore the IMA of this screw is 0.812? / 0.318 = 8.02

Physics
Step-by-step answer
P Answered by PhD
First sum applied the Newton's second law motion: F = ma
Force = mass* acceleration
This motion define force as the product of mass times Acceleration (vs.Velocity). Since acceleration is the change in velocity divided by time,
force=(mass*velocity)/time
such that, (mass*velocity)/time=momentum/time
Therefore we get mass*velocity=momentum
Momentum=mass*velocity
Elephant mass=6300 kg; velocity=0.11 m/s
Momentum=6300*0.11
P=693 kg (m/s)
Dolphin mass=50 kg; velocity=10.4 m/s
Momentum=50*10.4
P=520 kg (m/s)
The elephant has more momentum(P) because it is large.
Physics
Step-by-step answer
P Answered by PhD
The change in temperature is 9.52°CExplanation:Since, the heat supplied by the electric kettle is totally used to increase the temperature of the water.Thus, from the law of conservation of energy can be stated as:Heat Supplied by Electric Kettle = Heat Absorbed by WaterHeat Supplied by Electric Kettle = m C ΔTwhere,Heat Supplied by Electric Kettle = 20,000 JMass of water = m = 0.5 kgSpecific Heat Capacity of Water = C = 4200 J/kg.°CChange in Temperature of Water = ΔTTherefore,20,000 J = (0.5 kg)(4200 J/kg.°C) ΔTΔT = 20,000 J/(2100 J/°C)ΔT = 9.52°C
Physics
Step-by-step answer
P Answered by PhD
Weight of barbell (m) = 100 kg
Uplifted to height (h) = 2m
Time taken= 1.5 s
Work done by Jordan = potential energy stored in barbell = mgh
= 100×2×9.8
= 1960J
Power = energy/time
= 1960/1.5
1306.67watts
Physics
Step-by-step answer
P Answered by PhD
Weight of jasmine (m) = 400 N
Height climbed on wall (h) = 5m
Total time taken in climbing = 5 sec
Work done in climbing the wall = rise in potential energy = mgh
= 400×9.8×51
= 19600J
Power generated by Jasmine = potential energy / time
= 19600/5
= 3920Watts
Physics
Step-by-step answer
P Answered by PhD
The horizontal and vertical motions of balloons are independent from each other.
Let vertical component of initial velocity U' horizontal component of initial velocity U"
Time of landing (t) is found with the help of vertical motion.
Since vertical component of initial velocity of balloon is zero(U' = 0)
From equation h = U't + 1/2gt^2
h = 1/2gt^2
t = √(2h/g)
t = √( 2×150/9.8)
t = 5.53 sec
Horizontal velocity = 50m/s
Horizontal range of balloon, R = U"t
= 50× 5.53
= 27.65m
So the balloon will go 27.65 metre away from the bridge
Physics
Step-by-step answer
P Answered by PhD
Gravity acceleration (g) = 9.8m/s^2
Time (t) = 3sec
Acceleration = velocity/time
Velocity = acceleration×time
= 9.8×3
= 29.4m/s

Try asking the Studen AI a question.

It will provide an instant answer!

FREE