Answer:
Its density decreases, and its volume increases
Explanation:
Density is defined as Mass/Volume. What happens when water transforms into ice is that its density decreases because the volume the molecules now occupy increases.
The denominator of the rational expression
is now larger (while the numerator stays the same), so the quotient gives a smaller number.
Answer:
vB = 12 m/s
W = 36 J
Explanation:
Potential energy converts to kinetic energy
½mv² = mgh
v = √(2gh)
vB = √(2(9.8)(7.1 - 0) = 11.796609... m/s
W = mg(hA) - mg(hB) = 0.8(9.8)(7.1 - 2.5) = 36.064 J
From 1st EQ. of uniform motion
1)20.9-3.44/6=t=2.91 sec
2)28= 0+4.22a
a=6.66m/sec^2
3) Instantaneous acceleration