The local news team is tracking the storm and has reported that it is traveling north, northwest at 20 miles per hour. The repor
2 answers:
Answer:
Velocity of storm
Explanation:
As we know that all vectors are defined by their magnitude and direction both. Here as we can see that the reporter told about the flow speed of air which is 20 miles per hour. Also the reporter mentioned the direction in which this air is blowing.
So here we can find the magnitude of air flow as well as we can also find the direction of air flow.
So here this represents the vector quantity which is known as velocity.
So here we will say that the storm velocity is reported by the reporter here in the given statement
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(a) 423 J
The power of the battery is the ratio between the total energy stored (E) and the time elapsed (t):
However, the power is also the product of the voltage (V) and the current (I):
Linking the two equations together,
Since we know:
V = 9.0 V
We can calculate the total energy:
(b) dollars
The battery has a total energy of E = 423 J. (2)
1 Watt (W) is equal to 1 Joule (J) per second (s):
so 1 kW corresponds to 1000 J/s:
Multiplying both side by 1 hour (1 h):
and , so
So we find the conversion between kWh and Joules. So now we can convert the energy from Joules (2) into kWh:
And since the cost is $0.0660 per kilowatt-hour, the total cost will be
dollars