I’m sorry I can’t understand
Answer:
The equation which define the work done by spring is w = 45 x³ - 8 x²
Explanation:
Given as :
The force is the function of distance x
I.e F(x) = a x² - b x
where
a = 45 N/m²
b = 8 N/m
Now, Wok done = Force ×displacement
I.e W = F . ds
So , W = (a x² - b x) × x
or, W = (45 x² - 8 x) × x
Or, w = 45 x³ - 8 x²
So, the equation which define the work done by spring is w = 45 x³ - 8 x²
Hence The equation which define the work done by spring is w = 45 x³ - 8 x² Answer
Answer:
the answer is the diagram B
Answer:
speed in still air is 42 mph
Explanation:
given data
tail wind speed = 14 mph
time t1 = 5 min = 5/60 hr = 1/12 hr
return time t2 = 10 min = 10 /60 hr = 1/6 hr
to find out
how fast they fly
solution
we consider here speed in still air is x
then
speed in wind will be = x + 14
and against wind speed = x - 14
so
distance = speed × time .................1
so in wind distance = ( x + 14 ) × 1/12 ...................2
and against wind distance = ( x - 14 ) × 1/6 ..................3
so from equation 2 and 3
( x + 14 ) × 1/12 = ( x - 14 ) × 1/6
x = 42
so speed in still air is 42 mph
