If you know the rate of movement along a fault, the amount of offset over a period of time can be calculated. The basic relationship is

Rate = distance/time
Movement along the San Andreas Fault is about 3.5 cm/yr.

If a fence were built across the fault in 2005, how far apart will the two sections of the now-broken fence be in 2030?

Was the fence built Jan 1, 2005 or December 31, 2005? I'll assume Jan 1, 2005

distance = rate x time
d = 3.5 cm/yr x #years.
Plug in the # years between the time the fence was built and 2030 and solve for distance in cm. Approximately 90 cm if I plug in 26 years.

To calculate the distance between the two sections of the fence in 2030, we need to use the given rate of movement along the San Andreas Fault.

Given:
Rate of movement = 3.5 cm/yr
Year difference = 2030 - 2005 = 25 years

To calculate the distance between the two sections of the fence, we can use the formula:
Distance = Rate × Time

Substituting the values, we have:
Distance = 3.5 cm/yr × 25 years

Calculating the product:
Distance = 87.5 cm

Therefore, the two sections of the now-broken fence will be approximately 87.5 cm apart in 2030.

To calculate the distance the two sections of the broken fence will be apart in 2030, we can use the given rate of movement along the San Andreas Fault and the time interval of 25 years (2005-2030).

First, let's calculate the total movement of the fault over the given time period:
Movement = Rate * Time
Movement = 3.5 cm/yr * 25 years
Movement = 87.5 cm

Now we know that the fault has moved approximately 87.5 cm over the span of 25 years.

Since the fence was built across the fault in 2005, we need to add the total movement to the initial distance between the two sections of the fence to find the final distance in 2030.

Let's assume the fence was initially built with no gap between the sections. Therefore, the initial distance between the two sections of the fence would be zero.

Final Distance = Initial Distance + Movement
Final Distance = 0 cm + 87.5 cm
Final Distance = 87.5 cm

So, in 2030, the two sections of the broken fence will be approximately 87.5 cm apart.