Answer:
3.6 MJ
Explanation:
1 kWh = 1 MJ
Remember that this is the same as the equation Power×time = Energy
Step 1: Convert kWh (kiloWatt×hour) to Ws (Watt×second)
1 kW = 1000 Watt
1 h = 60 min×60 sec = 3600 seconds
1000 W×3600s = 3600000 Joules
Divide 3600000 J by 10^6 to get 3.6 Mega Joules
A pile driver is raised to a height if 3. 0m. How high would another pile driver with twice the mass of the first have ti be raised in order to have the same amount of potential energy? Please draw the work out! (20 points!)
The second pile driver must be raised to a height of 1.5m.
Assume the mass of the first pile driver is m and its height is h. Therefore, the potential energy (PE) of the first pile driver is given by:
PE1 = m * g * h
where g is the acceleration due to gravity.
Now, let's find the potential energy of the second pile driver, which has twice the mass of the first pile driver. The mass of the second pile driver is 2m.
To have the same amount of potential energy as the first pile driver, the second pile driver must be raised to a certain height, let's call it h2.
Therefore, the potential energy (PE2) of the second pile driver is given by:
PE2 = (2m) * g * h2
Since we want the potential energy of both pile drivers to be equal, we can set up an equation:
PE1 = PE2
m * g * h = (2m) * g * h2
We can cancel out the mass and acceleration due to gravity:
h = 2 * h2
Now we can solve for h2:
h2 = h / 2
Plugging in the value of h as 3.0m, we have:
h2 = 3.0m / 2
h2 = 1.5m
Therefore, the second pile driver, with twice the mass of the first pile driver, must be raised to a height of 1.5m in order to have the same amount of potential energy.
Here's a visual representation of the work:
First pile driver:
Potential energy (PE1) = m * g * h
Second pile driver:
Potential energy (PE2) = (2m) * g * h2
Since PE1 = PE2, we have m * g * h = (2m) * g * h2
Cancelling out mass and acceleration due to gravity, we get h = 2 * h2
Solving for h2, we find h2 = h / 2
Plugging in the value of h, we have
h2 = 3.0m / 2
= 1.5m
Therefore, the second pile driver must be raised to a height of 1.5m.
To know more about potential energy refer here
https://brainly.com/question/24284560#
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