To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
        
             
        
        
        
Answer:
4m/s
Explanation: 
May be different considering how long the pole is and how heavy the firefighter is.
 
        
             
        
        
        
The S.I. unit for the measure of the pressure is the Pascal (Pa). 1 Pascal corresponds to

We can convert the number given by the problem into Pascal:

And since 

, we have
 
 
        
        
        
Answer:
Explanation:
I got everything but i. Don't know why but it's eluding me. So let's do everything but that.
a. PE = mgh so
    PE = (2.5)(98)(14) and
    PE = 340 J 
b.  so
 so
     and
 and
    KE = 250 J
c. TE = KE + PE so
    TE = 340 + 250 and
    TE = 590 J
d. PE at 8.7 m:
    PE = (2.5)(9.8)(8.7) and
    PE = 210 J
e. The KE at the same height:
    TE = KE + PE and
    590 = KE + 210 so
    KE = 380 J
f. The velocity at that height:
     and
 and
     so
 so
    v = 17 m/s
g. The velocity at a height of 11.6 m (these get a bit more involed as we move forward!). First we need to find the PE at that height and then use it in the TE equation to solve for KE, then use the value for KE in the KE equation to solve for velocity:
    590 = KE + PE and
    PE = (2.5)(9.8)(11.6) so
    PE = 280 then
    590 = KE + 280 so
    KE = 310 then
     and
 and
     so
 so
    v = 16 m/s
h. This one is a one-dimensional problem not using the TE. This one uses parabolic motion equations. We know that the initial velocity of this object was 0 since it started from the launcher. That allows us to find the time at which the object was at a velocity of 26 m/s. Let's do that first:
     and
 and
    26 = 0 + 9.8t and
    26 = 9.8t so the time at 26 m/s is
    t = 2.7 seconds. Now we use that in the equation for displacement:
    Δx =  and filling in the time the object was at 26 m/s:
 and filling in the time the object was at 26 m/s:
    Δx = 0t +  so
 so
    Δx = 36 m
i. ??? In order to find the velocity at which the object hits the ground we would need to know the initial height so we could find the time it takes to hit the ground, and then from there, sub all that in to find final velocity. In my estimations, we have 2 unknowns and I can't seem to see my way around that connundrum.
 
        
             
        
        
        
Answer:
1st: Theatre History
4th Quarter
Upcoming
Due today
Syllabus
Due Sunday1st: Theatre History
4th Quarter
Upcoming
Due today
Syllabus
Due Sunday1st: Theatre History
4th Quarter
Upcoming
Due today
Syllabus
Due Sunday
Explanation:
1st: Theatre History
4th Quarter
Upcoming
Due today
Syllabus
Due Sunday