<u>Answer
</u>
D. Salt water is denser than freshwater.
<u>Explanation</u>
A boat is able to float on water because it experiences an upthrust upwards.
The magnitude of the upthrust depends on the density of the liquid.
When the liquid is denser the boat will experience a great upthrust as compared to when in a less dense liquid.
If the boat sinks lower in the freshwater than in salty water, then Salt water is more dense than freshwater.
If a 12-N force is applied continuously through a distance
of 12m, then the amount of work done is
(force) x (distance) = (12 N) x (12 m) = 144 joules.
Power = (work done) / (time to do the work)
= (144 joules) / (3 sec) = 48 joules/sec = 48 watts.
We don't care what purpose the force was used for,
or how much friction was involved.
Answer:
12 hour clock: 9:47
24 hour clock: 21:47
Explanation:
At 12:00 pm, add 12 for the hour. So, 1:00 pm is 13:00.
Answer:
b) n = 1 to n = 4.
Explanation:
a ) n = 4 to n = 1 transition represents release of energy because transition is from high energy orbit to low energy orbit.
Similarly c) n = 2 to n = 1 represents release of energy because transition is from high energy to low energy orbit.
d ) n = 1 to n = 3 is also energy absorbing transition but amount of energy absorbed is less as compared with option b) transition .
So the correct option is b)