We are given that a 500 kg object is hanging from a spring. To determine the amount the spring is stretched we will use Hook's law, which states the following:

Where:

Since the object is hanging the only force acting on the spring is the weight of the object. The weight of the object is:

Where:

Plugging in the values we get:

Solving the operations:

Now we solve for "x" from Hook's law by dividing both sides by "k":

Now we plug in the known values:

Solving the operations:

Therefore, the spring is stretched by 5.4 meters.
The storm would be at least 7 miles away cause light travels faster than sound and you can tell how many miles away a lightning bolt might have hit by how long it takes the thunder to strike<span />
The child is thrown for 7 seconds
It depends upon the type of graph that you are talking about,
If the graph is Velocity - Time graph, then time lies on the X axis and speed on the Y axis.
If it is Distance - Time graph, the time lies on the X axis and distance on the Y axis.
But generally, it is ALWAYS TIME IN THE ‘X’ AXIS AND DISTANCE ON THE ‘Y’ AXIS.
Let me know if you have any doubts by either commenting or messaging me
Explanation:
It is given that,
Voltage, 
De broglie wavelength in terms of voltage is given by :

m and e are the mass and charge on electron. So,



So, the De broglie wavelength of an electron is 1.53 meters. Hence, this is the required solution.