Kinetic energy and velocity are at zero when the magnets are held apart, and both increase rapidly when they are released and move together. Energy stored in the magnetic field decreases.
Answer:
275 kJ
Explanation:
KE = ½mv² = ½(1200)(25²) = 375,000
Answer: 65mph, 75mph
Explanation:
Let us assume x to be the speed of the slower train, in mph (miles per hour).
Then the speed of the other train is (x+10) mph, according to the question.
We then would have an equation like this
1.6x + 1.6(x+10) = 224.
This is because, the first addend in the left side is the distance covered by the slower train.
The second addend in the left side is the distance covered by the faster train.
The sum is 224 miles, because they together covered all the distance to the moment when they meet each other.
1.6x + 1.6x + 16 = 224
3.2x + 16 = 224
3.2x = 224 - 16
3 2x = 208
x = 208/3.2
x = 65
Thus the speed of the slower train is 65mph, and that of the other train is 65 + 10 = 75mph
Answer:
The helicopter uses 35 gallons to fly for 5 hours.
Explanation:
The amount of gas that a helicopter uses for flying varies directly proportional to the number of hours spent flying.
g ∝ T
where g represents amount of gas and T time of flight.
Then,
The helicopter files 4 hours and uses 28 gallons of fuel.
Here, g₁= 28 gallons, T₁=4 hours
g₂=?, T₂=5 hours.
⇒28×5= g₂×4
⇒ g₂×4=28×5
gallons
The helicopter uses 35 gallons to fly for 5 hours.
Explanation:
Denise, who is five month old baby is been looked after be a baby sitter as her mother, Marie has to work on the weekends. But Denise is reported to be unwell and cranky for a last few days. And Marie arrives home after getting a call from the baby sitter she found her child unresponsive and pulse was also very feeble. This might be because of the reason that Denise was not well for the last few days and she was suffering from sickness. The baby sitter might not be aware of her health and did not pay much attention to her or taken care of her. Due to the illness she might not have eaten any food or drink any milk or liquid which resulted in dehydration in Denise. So she fainted and was unresponsive.