Answer:
The real cubic expansivity is 0.024 per kelvin
Explanation:
check attachment
Answer:
t = 180 / 1.4 = 129 sec (time to swim horizontally across river)
S = 129 sec * V where V is speed of current and S is the distance he will be carried downstream
The problem does not specify V the speed of the river
Answer:
a. FALSE
b.TRUE
C. FALSE
Explanation:
The formula fot the distance between two points is given as

hence we determine the distances between all the points
a.P(3,2,-4), Q(1,0,-4), R(2,1,1)

For point PR
we have


B. For point RP

for point RQ we have

|RP|=|R Q|
C.

For point Q R


Answer:
A negative potential energy becomes more negative
Explanation:
Let the charges be - Q₁ and Q₂ . Let the distance between them be d .
Potential energy = k -Q₁x Q₂ / R
= - KQ₁ Q₂ / R
Now if the magnitude of R decreases , the magnitude of potential energy increases . So we see that the negative potential energy becomes more negative .
Precisely around 1,800 miles below.