Answer:
Explanation:
Here we know that initial temperature of ice is given as
now the latent heat of ice is given as
now we also know that the mass of ice is
so here we know that heat required to change the phase of the ice is given as
Answer:
v_s = 34.269 m / s
Explanation:
This is a Doppler effect exercise, in this case the observer is fixed and the sound source is moving.
f ’= f 
where the negative sign is used for when the source approaches the observer and the positive sign for when the source moves away from the observer
In this case when f ’= 5500 Hz approaches and when f’ = 4500 Hz moves away, let's write the two expressions together
5500 = f (
)
4500 = f ( 
)
let's solve these two equations
1.222 (v-v_s) = v + v_s
v_s (1+ 1.22) = v (1.222 -1)
v_s = v 
the speed of sound in air is v = 343 m / s
v_s = 343 0.09990
v_s = 34.269 m / s
5 because there is 5 electrons. In order for an atom to be neutral it has to have the same amount of positive and negative charges.
No problem, and you already know all about it.
Here are a few examples of same volume / different weight:
-- A bottle full of water is heavier than the same bottle when it's full of air.
-- Stones are heavier than styrofoam chunks the same size.
-- A bowl of meat loaf is heavier than a bowl of scrambled eggs.
In each example, two things have the same volume, but one weighs more than
the other. I didn't say anything about mass yet, but that's easy: As long as you
keep everything on Earth, more weight means more mass.
So how come, in each example, things with the same volume have different mass ?
This was your original question.
The answer is just the simple fact that there are millions of different substances, and
each different substance packs a different amount of mass into the same volume.
The amount of mass that a substance packs into a standard volume is called
the <em>density</em> of the substance. Meat loaf is more dense than scrambled eggs.
Stone is more dense than styrofoam. Water is more dense than air. And <em>gold</em>
is 19 times as dense as water. If you have a jar that holds a pound of water, and
you pour out the water and fill the jar with gold, the same jar holds 19 pounds of gold,
because the density of gold is 19 times the density of water.
The reason you were assigned to think about this question for homework is that
next time your Physics class meets, you'll start talking about <em>Density. </em><em /> And you're
all ready for it now.
