Answer:
60 J
Explanation:
KE = ½ mv²
KE = ½ (0.3 kg) (20 m/s)²
KE = 60 J
The correct answer would be <span>Magnesium oxide
Hope this helped :)
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Answer:
I = 12*B (the information about B does not appear in the statement)
Explanation:
The motion of the segment of the circuit, in a constant magnetic field makes that opposite charges inside the segment separate of each other. This generate a induced potential difference at the ends of the segment that is given by the following formula:
(1)
v: speed of the segment = 2.0m/s
B: magnitude of the magnetic field
(2)
The induced current calculated by replacing the result of (2) in the following formula:
(3)
Then, you only have to replace the value of the magnitude of the magnetic field B in (3) to calculate the current.
All we really need to know to answer this one is the speed of sound, and that's not easy. Sound has different speeds in wet air, dry air, warm air, cool air, and air at high or low pressure ... and ALL of these are present on the way from the thunderstorm to you !
So let's just use the number for the speed of sound in dry air at sea level and comfortable temperature: 343 meters/sec.
time = (distance) / (speed)
Time = (1485 meters) / (343 m/s)
Time = (1485/343) second
Time = 4.3 seconds roughly approximately around about
Explanation:
it has no energy when considered with respect to earth ,as it has neither height (i e potential energy) nor velocity (i.e kinetic energy).