Answer:
77647
Explanation:
= Efficiency = 34%
Power used in 1 home = 0.02 MW
Total power is
![P=\dfrac{800}{\eta}\\\Rightarrow P=\dfrac{800}{0.34}\\\Rightarrow P=2352.94117\ MW](https://tex.z-dn.net/?f=P%3D%5Cdfrac%7B800%7D%7B%5Ceta%7D%5C%5C%5CRightarrow%20P%3D%5Cdfrac%7B800%7D%7B0.34%7D%5C%5C%5CRightarrow%20P%3D2352.94117%5C%20MW)
Waste of power
![2352.94117-800=1552.94117\ W](https://tex.z-dn.net/?f=2352.94117-800%3D1552.94117%5C%20W)
Number of homes would be given by
![n=\dfrac{1552.94117}{0.02}=77647.0585\ homes](https://tex.z-dn.net/?f=n%3D%5Cdfrac%7B1552.94117%7D%7B0.02%7D%3D77647.0585%5C%20homes)
The number of homes that could be heated with the waste heat of this one power plant is 77647
Answer:
-24 m/s
Explanation:
mass of the bowling ball = 3 kg
time (t) = 0.3 seconds
Force = 24 N
initial velocity u = ???
We know that;
Force = mass × acceleration (a)
So;
24 = 3 × a
a = 24/3
a = 8 m/s²
Also;
From equation of motion; acceleration is given by the relation;
![a =\frac{v-u}{t}](https://tex.z-dn.net/?f=a%20%3D%5Cfrac%7Bv-u%7D%7Bt%7D)
if v = 0
then ;
![8 = \frac{0-u}{0.3}](https://tex.z-dn.net/?f=8%20%3D%20%5Cfrac%7B0-u%7D%7B0.3%7D)
24 = 0- u
u = -24 m/s
Thus; the initial velocity of the bowling ball when it first touched the mattress = -24 m/s
Velocity is defined by rate of change in the position
which we can also write as
![v = \frac{ds}{dt}](https://tex.z-dn.net/?f=v%20%3D%20%5Cfrac%7Bds%7D%7Bdt%7D)
while acceleration is defined as rate of change in velocity
![a = \frac{dv}{dt}](https://tex.z-dn.net/?f=a%20%3D%20%5Cfrac%7Bdv%7D%7Bdt%7D)
so acceleration and velocity both are rate of change in position and rate of change in velocity with respect to time respectively
out of all above statement the correct answer must be
<u>Acceleration equals change in velocity divided by time. </u>
Answer:
B. Transformer
Explanation:
A transformer is a device that is used to either raise or lower voltages and currents in an electrical circuit. In modern electrical distribution systems, transformers are used to boost voltage levels so as to decrease line losses during transmission. It basically trades voltage for current in a circuit, while not affecting the total electrical power. This means it takes high-voltage electricity with a small current and changes it into low-voltage electricity with a large current, or vice versa.