Well, you see, I don't think Alana really is the reference frame.
Call me paranoid, but I think you changed the reference frame
during the question, and didn't tell us.
In which reference frame is the 19 km/hr measured ?
It CAN'T be Alana's reference frame. Your own reference
frame moves along with you, and you can't move in it, even
if your name is Alana.
If Alana is the reference frame, and she throws the tennis ball
at 11 km/hr, then the speed of the ball is 11 km/hr in Alana's
reference frame. Her reference frame moves with her, so
it makes no difference how fast she is skateboarding in any
other reference frame, who she throws the ball at, or whether
or not he sees it coming and catches it.
Yes, this stuff can get confusing. And if you think it's bad now,
wait till you start reading some of Prof. Einstein's stuff, where
two people in the same reference frame can watch the same
tennis ball, and not even agree on how fast it's moving, because
THEY're both moving and their own motion makes their rulers
and clocks change ! So they measure different speeds, and
they're both right !
But I got distracted. I'm sorry. The point I'm trying to make,
right now when you're just starting to learn reference frames,
is that EVERY time you say a speed, you have to tell which
reference frame the speed is in. Because, as you're starting
to learn, the same object can have a different speed in every
reference frame.
And, just in case you're thinking about this later today
and you want to ask "Which one is the REAL speed ?" . . .
THAT's the whole point of learning about reference frames !
There is NO SUCH THING as REAL speed. It ALWAYS
depends on which reference frame it's measured in. They're
all different, they're all real, and they're all correct.
2. Is right..... if not then go with 1
A. - (lambda) per unit length of the inner surface of the cylinder<span>b. (lambda)outer = 3 (lambda)
</span><span>c. E= 3(lambda)/(4 pi epsilon(0) r^2)</span>
Answer:
A. Current power may decrease the fish population.
Explanation:
The statement that best describes the impact of ocean thermal power and current power on the environment is that current power may decrease the fish population.
The environment is made up of living and non-living components that co-exist and interact with one another.
- Harnessing current power from ocean movement will seriously affect the fish population.
- Most fishes are not sedentary. They move and glide through the water.
- When current power causes a change in the environment of the fish.
- This will definitely affect the normal condition prevalent in the body of water.
Have you ever been in a bus, a train, or a car ?
What happens to you when it stops suddenly ?
A body in motion continues in motion unless
an external force acts on it and makes it stop.
Amy's body keeps moving forward when the train stops.
She pitches forward, and if she doesn't reach out and grab
a seat or a seated person, she may lose her footing and fall
on her face.
Choice - 'A' is a very good explanation.
The other choices aren't.
'C' is a good hunch, but it only applies to her feet.
The rest of her keeps going.
'D' is nonsense. There are no mysterious forces of
'repulsion' or 'attraction' on the train.
