Answer:
The work function is
Explanation:
From the question we are told that
The light energy is
The stopping voltage is
Generally work function is mathematically represented as
Where KE is the kinetic energy of the ejected electron and it is mathematically represented as
Where e is the charge on the electron
So
Thus
=>
<span>we know energy = power*time(in hour)
so energy used by 1.20kw(1200 watt) toast oven used for 6.2 min(6.2/60 hour) =
1200*(6.2/60)=1200*0.103 = 124 watt hour.
Energy used by 11 w cfl used for 8.50 hour = (11*8) + (11* (50/60)) = 88+9.166=97.166 watt hour.</span>
Answer:
3894531 coulombs
Explanation:
1 hour = 3600 seconds
Let g = 10m/s2
The distance that the car travel at 25 m/s over an hour is
s = 25 * 3600 = 90000 m
The total mechanical energy of the car is the sum of its kinetic energy to reach 25 m/s, its potential energy to climb up 200m high hill and it work to travel a distance of s = 90000m with F = 500 N force:
This energy is drawn from the battery over an hour (3600 seconds), so its power must be
The system is 12V so its current is
or 1081.8 Coulombs/s
The the total charge it needs for 1 hour (3600 s) is
C = 1081.8 * 3600 = 3894531 coulombs
Here is the answer. The public can further be educated about the use of PFDs and BUI by the use of pamphlets that can be distributed to them when they buy a boat. Also, a commercial or advertisement would be helpful related to PFDs and BUI. In addition, they should also use the owner's manual. Hope this answers your question.