How does an object behave in differents liquids?
Answers
If the object has a lower density it will float and it if it has a higher density it will sink, different liquids may also be heavier or lighter causing a different outcome.
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A metal ball of mass 2 kg is supported by a massless inextensible string, 12 cm long. A horizontal force displaces the ball by 30oto the vertical so that the string remains taut. Find:a) the horizontal force.b) the tension in the thread.
While participating in a blood drive at school, Keona learns that blood has a density of 1.06 g/mL. She donates one pint of blood, which is equal to 473.176 mL. What is the mass of the blood Keona donates
Answers
Mass is a property of a lump of matter. It goes wherever the lump goes,
and it doesn't depend on what else may be nearby.
Weight is the force of gravity between a lump of matter and some other
mass. Since it depends on what else may be nearby, it can be different in
different places.
This is the correct answer in Physical Science. It's also the correct answer
in Biology, Math, Political Science, and Comparative Middle Eastern Religions.
wieght is a body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing.
B. The heavy caffeine molecules are more likely to fall apart than the lighter CuCl2 molecules.
C. The metallic bonds in copper chloride are stronger than the ionic bonds in caffeine.
D. Caffeine is a network solid and has a low melting point like other network solids.
Answers
Answer:
Option-A " The intermolecular forces holding the caffeine molecules together are weaker than the ionic bonds in CuCl₂ ".
Explanation:
There are two types of interactions among the atoms and molecules. One are known as intramolecular forces while the other are known as intermolecular forces.
Examples of Intramolecular forces are ionic bonds and covalent bonds e.t.c. while examples of intermolecular forces are hydrogen bond interactions, dipole-dipole interactions e.t.c.
Remember that intramolecular forces ar far more greater in strength than the intermolecular forces. Hence, in given statement the interactions between Caffeine molecules are intermolecular forces while, that between Cu and Cl ions in CuCl₂ are intramolecular forces.
Answers
It is clear that acceleration is directly proportional to the Force acting on a body. So, the amount of Force acting on a body is directly proportional to the acceleration, when the mass is constant.
This relationship was given be Sir Isaac Newton.
Mathematically ;
F = ma
Where F is force, a is acceleration and m is constant of proportionality , also known as mass.
meters away?
Answers
Answer:
60m/s
Explanation:
v=s÷t
75m÷1.25s=60m/s
Answer
60
Explanation:
This is because if the question gives you the distance and the time, you have to find the speed.
at a distance of 0.2m for m the equilibrium position.
Answers
Answer:
a) 12.8 N
b) 3.2 m/s²
Explanation:
I'm guessing the period is 0.5π s.
Period of a spring in simple harmonic motion is:
T = 2π √(m/k)
Given T = 0.5π and m = 2 kg:
0.5π = 2π √(2/k)
0.25 = √(2/k)
0.0625 = 2/k
k = 32
The spring constant is 32 N/m, and the maximum displacement is 0.4 m. The maximum force can be found with Hooke's law:
F = kx
F = (32 N/m) (0.4 m)
F = 12.8 N
The acceleration can be found with Newton's second law:
∑F = ma
kx = ma
(32 N/m) (0.2 m) = (2 kg) a
a = 3.2 m/s²
nonmetals and metals
metalloids and metals
nonmetals
Answers
Answer:
Nonmetals typically combine to form covalent compounds.
Explanation:
The octet rule states that the atoms of the elements bond each other in the attempt to complete their valence layer with eight electrons. That is to say, the atoms will tend to yield or share electrons to complete eight electrons in the valence layer.
In other words, the objective is to have the closest noble gas electronic configuration, thus having the last complete electron layer and acquiring stability.
The covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements. These elements have many electrons at their outermost level (valence electrons) and tend to gain electrons in order to comply with the octet rule mentioned and be stable. The shared electron pair is common to the two atoms and holds them together.
Then, nonmetals typically combine to form covalent compounds.
Answer: ionic bonds can form between nonmetals and metals, while covalent bonds form when electrons are shared between two nonmetals.
Explanation: