Answer:
[tex]11.3\ \text{g/cm}^3[/tex]
[tex]7.92\ \text{g/cm}^3[/tex]
[tex]238.1\ \text{cm}^3[/tex]
Explanation:
8) Volume of lead
[tex]V=4.5\times 5.2\times 6\\\Rightarrow V=140.4\ \text{cm}^3[/tex]
m = Mass of block = 1587 g
Density is given by
[tex]\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{1587}{140.4}\\\Rightarrow \rho=11.3\ \text{g/cm}^3[/tex]
Density of lead is [tex]11.3\ \text{g/cm}^3[/tex]
9) Volume of lead = Volume of water displaced = (49.1-45.5) = 3.6 mL = [tex]3.6\ \text{cm}^3[/tex]
m = Mass of iron = 28.5 g
Density is given by
[tex]\rho=\dfrac{m}{V}\\\Rightarrow \rho=\dfrac{28.5}{3.6}\\\Rightarrow \rho=7.92\ \text{g/cm}^3[/tex]
The density of iron is [tex]7.92\ \text{g/cm}^3[/tex]
10) m = Mass of silver = 2500 g
[tex]\rho[/tex] = Density of silver = [tex]10.5\ \text{g/cm}^3[/tex]
Volume is given by
[tex]V=\dfrac{m}{\rho}\\\Rightarrow V=\dfrac{2500}{10.5}\\\Rightarrow V=238.1\ \text{cm}^3[/tex]
The volume of silver is [tex]238.1\ \text{cm}^3[/tex]
A rock is dropped from a height of 3.4 m. How much time does it take to hit
the ground?
O .83 s
O 1.17 s
O 0.59 s
O 33.32 s
Which of the following would double the resistance in a wire?
a. Double the mass of the wire
b. Double the length of the wire
c. Half the mass of the wire
d. Half the length of the wire
Answer:
b. Double the length of the wire
Explanation:
I just took the test.
When we Double the length of the wire would double the resistance in a wire would double. The correct option is B.
What is resistance?Resistance is the obstruction of electrons in an electrically conducting material.
The mathematical relation for variation in resistance with length is given by
R = ρ*L/A
where r is resistance
ρ is the resistivity constant for
L is the length of the wire
A is an area of the cross-section for the wire
As evident from the above relation that resistance is directly proportional to the length of the wire keeping other parameters constant
Thus, by Doubling the length of the wire the resistance of the wire will be doubled, therefore the correct answer is B.
Learn more about resistance,here
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A wheel with radius r rotates freely about its axle with initial angular speed ωi. A point on the wheel's rim moves at linear speed v.
Suddenly, the wheel accelerates so the point moves at linear speed 3v. The final angular speed is ωf.
How does the angular speed of the wheel change?
Answer:
[tex]\dfrac{2\omega_i}{t}[/tex]
Explanation:
r = Radius of wheel
v = Initial linear speed
3v = Final linear speed
Initial angular speed is given by
[tex]\omega_i=\dfrac{v}{r}[/tex]
Final angular speed after time [tex]t[/tex] is given by
[tex]\omega_f=\dfrac{3v}{r}\\\Rightarrow \omega_f=3\dfrac{v}{r}=3\omega_i[/tex]
The angular acceleration of the wheel will give us how the angular speed of the wheel changes.
From the equations of rotational motion we have
[tex]\omega_f=\omega_i+\alpha t\\\Rightarrow 3\omega_i=\omega_i+\alpha t\\\Rightarrow \alpha=\dfrac{3\omega_i-\omega_i}{t}\\\Rightarrow \alpha=\dfrac{2\omega_i}{t}[/tex]
The acceleration wheel is [tex]\dfrac{2\omega_i}{t}[/tex].
Answer:increases by a factor of 3
Explanation: just trust me bro
A soccer ball was kicked off the roof of a building going
20m/s. It took 5 s for the soccer ball to hit the ground?
Find the vertical final velocity, the distance the ball
traveled horizontally, and the height the ball fell.
Answer:
Final vertical velocity = -29m/s
Horizontal distance = 100m
Height = 20.41m
Explanation:
1. The vertical final velocity can be calculated thus: vy = vyo - gt
Where;
vy = vertical velocity (m/s)
vyo = vertical initial velocity (20m/s)
g = acceleration due to gravity (9.8m/s²)
t = time (5s)
Hence, vy = vyo - gt
vy = 20 - (9.8 × 5)
vy = 20 - 49
vy = -29m/s
2. x = V0 x t
Where;
x = horizontal distance (m)
Vo = initial velocity
t = time (s)
x = 20 × 5
x = 100m
3. Maximum height = (voy)²/2g
= 20²/ 2 × 9.8
= 400/19.6
= 20.41m
Determine the gravitational energy of your 2 kg physics binder if it is sitting on the ground (height= 0
meters)
Answer:
0J
Explanation:
The gravitational potential energy of the body is 0J because the height is at 0m.
Gravitational potential energy is a form of energy which is highly dependent on the position of a body. The relative position of a body in space accounts for the amount of gravitational potential energy they posses.
A body at height 0m has no gravitational potential energy:Gravitational potential energy = mgh
m is the mass of the body
g is the acceleration due to gravity
h is the height
So, if h = 0, Gravitational potential energy will become 0.
the compound sodium sulfide consists of a ratio of two sodium ions (Na^+) to one sulfide ion (s^2-). Wrote a chemical formula for this compound.
Answer:Na2S
Explanation:
Doing assignment
Between which two atoms of water are hydrogen bonds are formed?
A. between the hydrogen atom of one water molecule and the oxygen atom of another
B. between the hydrogen atoms of two water molecules
C. between the oxygen atoms of two water molecules
Pretty cool, the atoms that exist in your body are some of the same atoms that have existed since the beginning of the universe. You are made of star stuff. What scientist made this observation?
1) Neil Degrasse Tyson
2) Albert Einstein
3) Carl Sagan
Answer:
Your answer is option 3
Explanation:
The statement is that the atoms that exist in our body are the same number of atoms that existed at the beginning of the universe. This statement is said by Carl Sagan. Hence, option (3) is correct.
What is an atom?The atom is the smallest form of matter that can be separated without releasing particles with electrical charge. It is also the smallest material with chemical element-like properties. As a reason, the atom is the basic unit of chemistry.
The most of an atom is made up of space. The remainder consists of a cloud of electrons with negative charge orbiting a positive electrode nucleus composed of protons and neutrons. The nucleus is small and dense in comparison to electrons, the lowest charged particles in nature. Electric forces, which connect electrons to the nucleus of atoms, pull electrons to any positive charge.
To know more about Atom :
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Why does the comet have tails
Answer:
Comets leave long beautiful tails when they come close to the sun. ... But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.
Explanation: I just searched it up on the internet lol.
Answer:
when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and micro particles
Explanation:
:)
The United States has a_____ economy
A command
B. pure market
C. mixed market
D. central planned
Please select the best answer from the choices provided
Answer:
C
Explanation:
The United States has a mixed economy it works according to economic system that features characteristics in both capitalism and socialism it makes economy system protects some private properties and allows a level of economic freedom in the use of capital
Answer:
C. is Levi's fav letter
Explanation:
i thought that ray was ugly but NAH
whos still awake???
Answer:
definitely not me
Explanation:
why would I?
this is my physical science homework on chemical equations please if you can answer them in order thank you!
The energy that is stored in
chemical composition of matter is....
a. Potential Energy
b. Elastic Enersy
c. Chemical Energy
d Mechaneal Energy
Answer:
C
Explanation:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place.
In which situation is no work being done?
Answer:
procrastinating
Explanation:
procrastinating is when someone dose not want to do work
Explanation:
if force is applied but object do not move then
it is situation for no work done
For which optical devices does d¡ always have a negative value?
A. A and B
B. A and D
C. Band D
D. B and C
Answer:
Explanation:
A i think
Which of the following is NOT a type of electromagnetic wave?
Answer:
Sound waves
Explanation:
You should let someone else answer too though because I'm not 100% sure that's the correct answer.
50 POINT PHYSICS QUESTION! PLEASE HELP!
A girl, standing on a bridge, throws a stone vertically downward with an initial velocity of 12.0 m/s, into the river below. If the stone hits the water 2.50 seconds later, what is the height of the bridge above the water?
Remember to identify all your data, write the equation, and show your work.
Answer: I solved it and got 30.65 meters.
Explanation: Pic Attached. Hope this helps.
Answer:
30.65
Explanation:
becuase i read the othe part
3. Why does any bonding occur (this includes ionic bonding and covalent bonding)?
A.to avoid nuclear decay
B.to decrease stability
C.to increase nuclear decay
.
D.to increase stability
Answer:im not sure but hope this helps
Explanation:
Covalent bonds are formed because of sharing electrons whereas ionic bonds formation occurs because of transferring of electrons. Molecules are the particles in covalent bonds all through compound formation whereas in ionic bonds these are positively charged and negatively charged ions.
Weight and mass are different because,
Answer:
Explanation:
The answer is [C]
Matching vocabulary terms
Answer:
.
Explanation:
26 = Terminal Velocity
27 = Force
34 = Momentum
33 = Laws of Conversation of Momentum (I think)
Brian and Emily are testing different paper airplane designs to see which will allow a plane to travel the farthest distance. Emily folds her plane and attaches a paperclip to the front of it. After she throws the plane, it travels about fifty feet and then falls to the ground. Why does the plane eventually fall to the ground?
Halp meh pleaase
Answer:
The answer is "The gravity force is stronger than for the powers in the air".
Explanation:
Gravity is the fundamental attraction force which acts among all material. On Earth, each organ does have a weight, and decreasing force of gravity, it relative towards its weight imposed by the earth's mass. Force is measured mostly by acceleration it gives to artifacts that can drop, that's why the plane eventually falls to the ground.
Which of the following materials is a mixture? A. water B. table salt C. seawater D.iron filings
Answer:
eu acho que ê a B
uma bela noite abençoada
Answer:
The answer is "B" table salt
Good look
Explanation:
What is a force ?????
Answer:
A force is a push or pull upon an object resulting from the objects interaction with another object
what are some of the uses of ultra-sound
Answer:
Ultrasound has been used in a variety of clinical settings, including obstetrics and gynecology, cardiology and cancer detection. The main advantage of ultrasound is that certain structures can be observed without using radiation. Ultrasound can also be done much faster than X-rays or other radiographic techniques
Answer:
Ultrasound can be used for various purposes like diagnosing conditions, including those in the heart, blood vessels, liver and more. Yet most commonly to monitor growth and development of a fetus. A echocardiogram is a ultrasound of the heart.
Explanation:
1. The same amount of work can be done when applying a small force over a long distance or applying a large force over a short distance, since work equals blank times blank
Answer:
work done = force × displacement
what equation demonstrates the law of conservation of mass
Answer:sorry i am only in 6 grade but this is a explanation
Explanation:Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
If the velocity of a moving object decreases from 60 m/s to 30 m/s, what happens to its momentum? (2 points) Group of answer choices It is reduced by half It doubles It stays the same It quadruples
Answer:
it is decreased by 1/2
Explanation:
The velocity of the moving object is reduced by half decreasing speed is also decreasing the momentum of a certain object.
Answer:
-1/2
Explanation:
Which arrow is the action and which arrow is the reaction?
A skater increases her velocity from 2.0 m/sec to 10.0 m/sec in 3.0 sec. what is the acceleration of the skater
Final speed 10.0 rn/s Change in time = 3 seconds The acceleration of the skater is 2.7 meters per second Relationship per second. 3.
A car travels for 10 seconds at 5 m/s. How much distance does it travel?