Li2O
Lithium is a metal with an oxidation number of 1+ and oxygen is a nonmetal with an oxidation number of 2-. Which chemical formula represents the compound formed by these two elements? Li2O is the correct answer because lithium has one valence electron and oxygen has six.
Hope this helped.
Given:
V1 = initial velocity = 24 m/s
a = acceleration = 2.0 m/s^2
s = time = 8 s
V2 = final velocity = ?
For linear-motion problems with those given terms, the following formula is used:
V2 = V1 + as
Substituting the given values:
V2 = 24 + 2(8)
V2 = 24 + 16
V2 = 40 m/s
Therefore the car will have a speed of 40 m/s as it leaves the tunnel.
Answer: Yes both gases would have the same entropy.
Explanation:
The formula for the change in the entropy is as follows,
Here, \Delta S is the change in the entropy, Q is the heat transfer and T is the temperature.
If the temperature of the system increases then there will be increase in the entropy as the randomness of the system increases.
In the given problem, if the both gases were initially at the same absolute temperature. Then there will be same entropy change in both gases.
Therefore, yes both gases would have the same entropy.
Gravitational potential energy above a reference level is M G H .
In this story,
-- M = 25kg
-- H = 15m
and if the story takes place on Earth, then
-- G = about 9.8m/s².
PE = (M) (G) (H) = (25) (15) (9.8) = <em>3,675 joules</em> .
That's the gravitational potential energy acquired by the suitcase
in the process of being lifted 15 meters straight up.
Sadly, human physical effort is far from 100% efficient, and the woman in
the story has to expend a lot more energy than that just to lift the suitcase
up the stairs. AND PLUS don't forget that she also has to come up with
enough additional energy to increase the potential energy of <em>her own</em> mass,
no matter how dainty it may be, by 15 vertical meters' worth.
Now 25 kg = about 55 pounds,
and 15 meters = about 50 feet, or something like 4 to 5 stories
You can be sure that some beads of glow highlight her forehead
by the time she's done with this job.
