PHYSICS HIGH SCHOOL

In the mass-energy equivalence equation, c stands for _________.A. mass
B. energy
C. charge
D. the speed of light

Answers

Answer 1
Answer:

Correct answer is D.

The famous mass-energy equivalence equation is given by Einstein. It states that mass is concentrated energy. The equivalence is expressed as, E=mc². E stands for energy equivalent to the mass m and c is the speed of light.

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Bena thinks that dissolving more salt in water causes the mixture’s freezing temperature to change. Which is the best type of scientific investigation for Bena to use to study this?

Answers

Entropy and the Second Law of Thermodynamics.
Dissolving salt in water lowers the temperature at which the water freezes, or at which the ice melts. 

A hollow plastic sphere is held below the surface of a fresh-water lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.650 cubic meters and the tension in the cord is 900 N. a) Calculate the buoyant force exerted by the water on the sphere. b) what is the mass of the sphere? c) the cord breaks and the sphere rises to the surface. When the sphere comes to rest, what fraction of its volume will be submerged?

Answers

Answer: a) B = 6811N

              b) m = 603.2kg

              c) 86.8%

Explanation: Buoyant force is a force a fluid exerts on a submerged object.

It can be calculated as:

B=\rho_(fluid).V_(obj).g

where:

\rho_(fluid) is density of the fluid the object is in;

V_(obj) is volume of the object;

g is acceleration due to gravity, is constant and equals 9.8m/s²

a) For the hollow plastic sphere, density of water is 1000kg/m³:

B=10^(3).0.695.9.8

B = 6811N

b) Anchored to the bottom, the forces acting on the sphere are Buoyant, Tension and Force due to gravity:

B = T + F_(g)

B = T + mg

mg = B - T

m=(B - T)/(g)

Calculating:

m=(6811 - 900)/(9.8)

m = 603.2kg

c) When the shpere comes to rest on the surface of the water, there are only buoyantandgravity acting on it:

B = m.g

\rho_(w).V_(sub).g=m.g

V_(sub)=(m)/(\rho_(w))

V_(sub)=(603.2)/(1000)

V_(sub) = 0.6032m³

Fraction of the submerged volume is:

(V_(sub))/(V_(obj)) = (0.6932)/(0.695) = 0.868

Final answer:

We use the principles of buoyancy and Archimedes' principle to calculate the buoyant force, the mass of the sphere, and the fraction of volume submerged when the cord breaks. The buoyant force equals the weight of water displaced by the sphere, we will find this by calculating the difference between the weight of the sphere in air and its weight when submerged in water. The sphere's mass can be found using its volume and the density of plastic, whilst the fraction of volume volume submerged when the cord breaks will be such that the weight of water displaced equals the weight of the sphere.


Explanation:

To answer these questions, we will apply the principles of buoyancy and Archimedes' principle. Archimedes' principle states that the buoyant force on an object is equal to the weight of fluid displaced by the object. Buoyant force is hence the difference between the weight of the object in air and its weight when submerged in water.

(a) Calculating the buoyant force:

The total force acting on the sphere when it is submerged is the sum of the weight of the sphere (i.e., mass of sphere times the gravitational acceleration) and the tension in the cord. Since the sphere is at equilibrium, this total force equals the buoyant force exerted by the water. We can calculate the weight of the sphere in water as the weight of the sphere (mass x gravity) less the tension in the cord (900N).

(b) Calculating the mass of the sphere:

We can calculate the mass of the sphere by using the volume of the sphere and its density (which is the mass divided by the volume). Since the sphere is of plastic, we can look up or be provided the density of plastic to plug in here.

(c) Determining the fraction of volume submerged when the cord breaks:

When the cord breaks, the sphere will rise until the buoyant force and the weight of the sphere balance out. This happens when the amount of water displaced weighs the same as the sphere. The fraction of the sphere's volume that needs to be submerged to displace an amount of water with the same weight as the sphere will give the fraction of the spherical volume submerged.

Learn more about Buoyant Force here:

brainly.com/question/20165763


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When magnesium (Mg2+) and fluorine (F1-) combine in an ionic bond, the resulting formula will be A) Mg2F.


B) Mg2F2.


C) MgF.


D) MgF2.

Answers

Answer is: D) MgF₂.

Magnesium fluoride is salt, ionic compound.

1) Magnesium (Mg) is metal from 2. group of Periodic table of elements and has low ionisation energy and electronegativity, which means it easily lose valence electons (two valence electrons).

Magnesium has atomic number 12, which means it has 12 protons and 12 electrons. It lost two electrons to form magnesium cation (Mg²⁺) with stable electron configuration like closest noble gas neon (Ne) with 10 electrons.

Electron configuration of magnesium ion: ₁₂Mg²⁺ 1s² 2s² 2p⁶.

2) Fluorine (F) is nonmetal with greatest electronegativity, which meand it easily gain electrons.

Fluorine jas atomic number 9, which means it has 9 protons and 9 electrons. It gain one electron to form fluorine anion (F⁻) with stable electron configuration like closest noble gas neon (Ne) with 10 electrons.

Electron configuration of fluorine ion: ₉F⁻ 1s² 2s² 2p⁶.
The fluorine has one spare electron per atom and the magnesium has a need for 2. This means for one magnesium you need two fluorine atoms making the formula MgF2.

If a force of 65 N is exerted on a 45 kg sofa and the sofa is moved 6.0 meters, how much work is done in moving the sofa? 17,550 J 171.990 J 390 J none of the above

Answers

Answer:

The answer to your question is:   W = 390 J

Explanation:

Work is the transfer of energy when a body is moved from one place to another.

Data

Force = 65 N

mass = 45 kg

distance = 6 meters

work = ? J

Formula

W = F x d

Process

                   W = 65 N x 6 m

                   W = 390 J

Answer: 390 J

Explanation:

i got it right on my exam :D

Which of the following is not one of da Vinci's contributions to technology?a. effect of the moon on tides
b. modern theory on the formations of the continents
c. precise observations of human anatomy
d. ideas for space travel

Answers

Answer: Option d: ideas of space travel.

Explanation:

Leonardo da Vinci was an Italian. He had numerous skills in various different fields. Leonardo contributed to technology for the effect of moon on the tides,  his theory on formation of continents, human anatomy, art and much more. But he did not contribute in the ideas for space travel. Hence, the correct option is d.

Answer:D

Explanation:

Athen transparent sheet is placed in front of one of slits in ydse experiments the fringe width will

Answers

Answer:

when a thin transport sheet is placed in front of the double

slit no physical quantities affecting the fringe withers changed therefore the fringe width remains the same

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