What are the two main factors thataffect how quickly a coastline erodes?
1 answer:
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Answer:
a) 2.7s
b) 29 m/s
Explanation:
The equation for the velocity and position of a free fall are the following
-(1)
- (2)
Since the hot-air ballon is <em>descending </em>at 2.1m/s and the camera is dropped at 42 m above the ground:
To calculate the time which it takes to reach the ground we use eq(2) with x=0, and look for the positive solution of t:
t = 2.71996
Rounding to two significant figures:
t = 2.7 s
Now we calculate the velocity the camera had just before it lands using eq(1) with t=2.7s
v = -28.782 m/s
Rounding to two significant figures:
v = -29 m/s
where the minus sign indicates the downwards direction
Answer:
dv = 1.03 inch^3
Explanation:
given data:
diameter = 3 inch
radius = 1.5 inch
height 4 inch
top and bottom thickness is 0.02 inch
side thickness = 0.015 inch
we know that volume of the cylinder is given as
by definition of differential we have
where dh = -(0.02 + 0.02) = 0.04 inch [ sum of top and bottom thickness]
the radius is decreased by 0.02 inch, dr = 0.02 inc,
dv = 37.69*(0.02) + 7.06*(0.04)
dv = 1.03 inch^3