Answer:
C) steel turning to rust in salt air
Explanation:
The missing options are:
A) ice melting to form liquid water
B) water boiling to form steam
C) steel turning to rust in salt air
D) sugar dissolving into hot coffee
In a chemical change the atoms of the reacting compounds are reordered forming new compounds. In a chemical change, new compounds appear, but in a physical change not.
Then, change of states like ice melting and water boiling are not chemical changes.
During steel rust, components of steel, like iron, are oxidized, that is, reacts with oxygen forming oxides.
The dissolution of sugar into hot coffee is a physical change in which sugar molecules get further apart in the coffee, but they don't change.
Answer:
Ernest Rutherford observed that particles with a positive charge deflected when passing through a thin sheet of gold foil, concluding that the atom's positive part is small and dense.
Explanation:
The Ernest Rutherford experiment describes planetary model of an atom. According to the model, an atom has a tiny, compact, positively charged centre called a nucleus, where almost all of the mass is concentrated, while light, negatively charged particles called electrons orbit far around it, much like planets orbit the Sun. In his experiment, the observation that a positive charge is deflected through a thin sheet of gold foil led to the conclusion that the deflection some of the positive charge occurs in a small region of the atom. At the same time, the majority passed through the atom (which was also concluded to be empty space).
To understand more about planetary model of an atom. click, brainly.com/question/6546005
Answer: 3.53 x 10^-4 s
Explanation:
12.7cm x 1m/100cm = 0.127m
V = d/t
t x V = d
t = d/v = 0.127m/(360m/s) = 0.000353s or 3.53 x 10^-4
Yes they transfer waves in order to get energy of mechanical
Answer:
a
The velocity is
b
The diameter is
Explanation:
The diagram of the set up is shown on the first uploaded image
From the question we are told that
The height of the water tank is
The position of the hole below water level
The rate of water flow
According to Bernoulli's theorem position of the hole
Where u is the initial speed the water through the hole = 0 m/s
is the atmospheric pressure
Substituting value
The Volumetric flow rate is mathematically represented as
Making A the subject
substituting value
Area is mathematically represented as
making d the subject
Substituting values