Answer:
A
Explanation:
You did not list the options. However, knowing the possible options from having seen the material myself - I can infer that the answer option is A. I apologize sincerely if this is wrong.
Which statement is true about Car A?
Car A has a velocity of 40 km/hr
west.
Car A has a velocity of 40 km/hr
east.
Car A has the same velocity Car E.
Car A has a velocity of 40 km/hr.
Answer:
Car A has a velocity of 40 km/hr west.
Explanation:
The velocity of an object is a vector quantity. It has both magnitudes as well as direction.
Arrows are used to show direction.
Car A is moving towards west. Car B is moving towards east-south direction. Car C is moving towards South direction. Car E is moving towards North direction.
So, the correct option is (a) i.e. Car A has a velocity of 40 km/hr west.
At the depth of 10 m, the diver breathes in air from the scuba tank, filling her lungs with air whose pressure equals that of the surrounding water. How does the number of air molecules in her lungs compare with the number she had in a full breath at the surface?
A. Half as many
B. The same
C. Twice as many
D. Four times as many
Answer:
The number of air molecules in her lung compared with the number she had in a full breadth at the surface is;
C. Twice as many
Explanation:
The depth at which the scuba diver fills her lungs with air, d = 10 m
Pressure of fluid = Density, ρ × Acceleration due to gravity, 'g' × Depth, 'd'
Where;
ρ = 970 kg/m³
g ≈ 9.81 m/s²
∴ The pressure of the water of the 10 m water column = 970 kg/m³ × 9.81 m/s² × 10 m = 95,157 Pa
The atmospheric pressure, P₁ = 101,325 Pa
The total pressure at the 10 m depth = The atmospheric pressure + The pressure of the water of the 10 m water column
∴ The total pressure at the 10 m depth, P₂ = 95,157 Pa + 101,325 Pa = 196,482 Pa
By the combined gas law, we have;
P₁·V₁/n₁ = P₂·V₂/n₂
Where;
P₁ = The atmospheric pressure
P₂ = The pressure at 10 m depth
V₁ = V₂ = The volume of her lungs
n₁ = The number of air molecules at the surface that fills her lungs
n₂ = The number of air molecules that fills her lungs at the 10 m depth
Therefore, we have;
P₂/P₁ = n₂/n₁ × V₁/V₂
From V₁ = V₂, we have;
P₂/P₁ = n₂/n₁ × V₁/V₁ = n₂/n₁ × 1
∴ P₂/P₁ = n₂/n₁
P₂/P₁ = 196,482/101,325 ≈ 2
∴ P₂/P₁ = n₂/n₁ ≈ 2
n₂ ≈ 2 × n₁
The number of air molecules that fills her lungs at the 10 m depth, n₂ is approximately 2 times (twice) as many as the number of air molecules at the surface that fills her lungs, n₁
Therefore the correct option is twice as many molecules as she had in a full breath at the surface is required to fill her lungs at the 10 m water depth.
This question involves the concepts of pressure, the equation of state, and the number of molecules.
The number of molecules in hr breathe are "C. twice as many" as compared to the number of molecules in her lungs when she had a full breath at the surface.
According to the equation of state:
[tex]\frac{P_1V_1}{n_1}=\frac{P_2V_2}{n_2}[/tex]
where,
n₁ = no. of molecules in lungs at surface
n₂ = no. of molecules in lungs at depth
P₁ = Pressure at surface = Atmospheric Pressure = 101325 Pa
P₂ = Pressure at depth = 101325 Pa + ρgh
P₂ = 101325 Pa + (1000 kg/m³)(9.81 m/s²)(10 m) = 199425 Pa
V₁ = V₂ = V = Volume of lungs
Therefore,
[tex]\frac{(101325\ Pa)V}{n_1}=\frac{(199425\ Pa)V}{n_2}\\\\[/tex]
n₂ = 2 n₁
Learn more about the equation of state also known as general gas law here:
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Use the galvanometers to determine the amount and direction of the induced current. Which galvanometer is
indicating a current of 4 mA?
Answer:
Option B
Explanation:
Looking at the 3 galvanometer readings given above, for galvanometer A, the reading is -2 mA.
For galvanometer B, the reading is 4 mA.
While for galvanometer C, the reading is -5 MA
Thus, option B is correct.
Answer:
B, the second picture
Explanation:
edge 2022
what is reflection of light question mark write the laws of reflection of light
Answer:
Reflection of light means the bouncing back of light in another direction after hitting a smooth polished surface
laws of reflection1) Angie of incidence is equal to the angle of reflection
2) The nornal ray, reflected ray and the incident ray all lie in the same plane
explain newton's second law of motion
Answer: Newtons second law of motion: the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Explanation:
Hope this helps you! Have a good day!
Answer:
Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Example:Newton's Second Law of Motion says that acceleration (gaining speed) happens when a force acts on a mass (object). Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass. Your leg muscles pushing pushing on the pedals of your bicycle is the force.
Explanation:
~Hope this helps
5. How many kilowatt-hours of energy would be used by a 40 W bulb that runs for 10 hours every
day during the course of one year?
Answer:
E = 0.4 kWh
Explanation:
Given that,
The power of a bulb, P = 40 W
Time, t = 10 hours
We need to find the energy used by the bulb. Let it is equal to E. So,
[tex]E=P\times t\\\\E=40\times 10\\\\E=400\ W-h\\\\or\\\\E=0.4\ kWh[/tex]
So, 0.4 kWh of energy would be needed.
Answer: 146,000 Wh or 146 kWh
Explanation:
65 days × 10 hours × 40 W = 146,000 Wh or 146 kWh
What is another term for weak solutions?
A.
supersaturated solutions
B.
concentrated solutions
C.
dilute solutions
D.
saturated solutions
Answer:
c
Explanation:
diluted means weakened
Another term for weak solutions is dilute solution. Thus, the correct option for this question is C.
What is a weak solution?A weak solution may be defined as a type of solution that significantly partially dissociates into its ions in an aqueous solution or water. In contrast, a strong solution fully dissociates into its ions in water.
The concentration of the weak solution is found to be lower as compared to the strong solution. The word dilute also symbolizes the presence of less concentration in any solution.
The main difference between weak and strong solutions is true that for strong solutions we are given a Brownian motion on a given probability space whereas for weak solutions we are free to choose the Brownian motion and the probability space.
Therefore, another term for weak solutions is dilute solution. Thus, the correct option for this question is C.
To learn more about Weak and strong solutions, refer to the link:
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A box is placed on the floor.The area of the box in contact with the floor is 2.4m²Pressure exerted on the floor 16 newtons/m²Work out the force exerted by the box on the floor
Answer:
The force exerted by the block on the floor is 38.4 Newtons
Explanation:
The given parameters are;
The area of the box in contact with the floor, A = 2.4 m²
The pressure exerted by the block on the floor, P = 16 N/m²
The force exerted by the box on the floor is given as follows;
[tex]Pressure, P = \dfrac{Force, F}{Area, A}[/tex]
∴ F = P × A
From the question, P = 16 N/m², and A = 2.4 m²
∴ F = 16 N/m² × 2.4 m² = 38.4 N
The force exerted by the block on the floor, F = 38.4 N.
If I hit a guy in the mouth with my left hand even though I'm right handed, would it count as me hitting them?
Answer:
yes it would u just wouldn't be able to hit him as hard as u would if u were using your dominate hand
Explanation:
Jupiter's gravity is about 2.3 times stronger than Earth's gravity. Calculate the
mass and weight of a scientific instrument if it were on the surface of Jupiter,
given its mass and weight on Earth's surface.
On Earth's Surface
On Jupiter's Surface
Mass
54 ks
A.
B.
Weight
529 N
What is A
What is B
Answer:
Explanation:
There is no change in mass. Therefore, mass = 70 k g
Weight on Jupiter ≈ 1578 N
A swarm of locust eats the leaves of most of the trees in a forest. How would the trees be most directly affected?
Please HELP!
Answer:
A trees food and air source would be deprived because of this. Trees need leaves to perform photosynthesis, so besides their roots soaking up water and nutrients, they wouldn't have any other form of food until those leaves grow back. If they don't and the locusts continue to eat up the tree, it will eventually starve and die.
Explanation:
Imagine the trees trunk and roots as your body and the leaves as your mouth/food source. God Forbid you catch a cold or some sickness. You probably won't have the appetite to eat. Despite that, you'll still have to. But, if you get so sick to the point that eating just makes you throw it up before your body can take in the nutrients and beneficial stuff, you will eventually get to the point where eating is nearly impossible. This will lead up to the sickness taking over your body, as there's no energy going in to help it fight it off, and you would die.
(Gah, sorry for the dark theme... didn't think it would turn like that lol)
Anyways, hope this helped!
Source(s) used: N/A
The Work-Energy Principle states that work is equal to the
change in kinetic energy. What unit measures these variables!
Answer:
the workenergy principle is measured in joules
How many moles are there in 321g of silver hydroxide?
Answer:
2.5705594546378 mol
Explanation:
Used this calculator
http://www.endmemo.com/chem/mmass.php
is oxegen abiotic or biotic
Answer:
Oxygen is abiotic
Explanation:
The noble gas neon is used for filling neon signs. Like other noble elements, it has a full octet (complete outer energy level) of electrons, which makes the gas A. freeze at room temperature. B. react with other gases in the air. C. unlikely to combine with other elements. D. solidify at standard pressure and temperature, chiny pray-colored solid at room
Answer:
C. unlikely to combine with other elements.
Explanation:
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Noble gases are chemical elements with eight valence electrons and as such have a full octet. Some examples are argon, neon, etc.
Hence, the full octet makes the gas (neon) unlikely to combine with other elements.
This distance from the Earth to the Sun given above is a standard for measuring other distances in the solar system and is called an Astronomical Unit or AU. 1AU=_________miles. Write this as a ratio:_________
Answer:
The Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex], the ratio of Astronomical Units per mile is [tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].
Explanation:
The distance from the Earth to the Sun is approximately [tex]92.96\times 10^{6}\,mi[/tex], then the Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex]. The ratio can be described by the quantity of miles per Astronomical Unit, then we define:
[tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].
If the radius of an electron's orbit around a nucleus doubles but the wavelength remains unchanged, what happens to the number of electron wavelengths that can fit in the orbit?
Answer:
Number of electron wavelength will Double
Explanation:
let the radius = r and wavelength = λ
when R doubles and λ ( wavelength ) remains the same
The number of electron electron wavelengths will double as well
Using Bohr's angular momentum quantization to show this
attached below
Which of these shows the position of the Sun, Moon, and Earth when a full moon phase occurs? (8.7B)
Answer:
Lunar eclipse
Explanation:
Lunar eclipse occurs when Earth comes in between sun and Moon. The moon is either partially or fully blocked and the moon sighting appears to be black from earth since the light rays coming from sun are blocked by Earth. Lunar eclipse occurs only at full moon. The moon is aligned with the position of earth and sun so that they all form a straight line.
Water in a tank which is positioned 5 feet above the ground is _____ potential energy? (answers would be like thermal, electric, mechanical)
Answer:
Mechanical
Explanation:
The tank is at rest. And energy of any substance at rest is known as potential energy.
Now, in forms of energy, potential energy is a type of mechanical energy.
Thus, the correct option is mechanical Energy.
Look up how much power a typical light bulb uses/produces. Then look up how much power a typical microwave uses/produces. How do these appliances compare to your physical activities?
The current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.
Energy dissipated by electrical applianceThe amount of energy dissipated by an electrical appliance is the calculated using the following formulas;
P = I²R
where;
P is powerI is currentR is resistanceThe current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.
Learn more about power here: https://brainly.com/question/13881533
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Who wants to do my missing physics work
Answer:
WHAT IF I HATE PHYSICS ?A gas has a volume of 3.00 L at 10.0 °C.
What is the temperature of the gas if it
expands to 6.00 L, assuming constant pressure?
5)
Which statement is true about a liquid but not a gas?
A)
It has more internal energy than the solid state.
B)
It will change shape and take the shape of its container.
It allows particle to move past each other relatively easily.
Eliminate
D)
It has close to a constant volume as pressure is applied to it.
PLS HELP, WILL GIVE BRAINLIEST
what is the right part of a chemical equation called?
2H2 + O2 ---> 2H2O(what is this part called)
a. chemical equation
b. products
c. reactants
d. yields
Answer:
I'm pretty sure its product.
Explanation:
Hope this helps and have a wonderful day!!!!
What is the name of asteroids that stray outside the main belt and cross outside Mars taking them closer to the Sun?
a
Sun-crossing asteroids
b
Mars-crossing asteroids
c
Apollo asteroids
d
Earth-crossing asteroids
Answer:
b im pretty sure (let me know if this is correct!) :)
Explanation:
PLEASE HELPPP! :))))
Answer:
Jupiter Neptune moon Uranus
Explanation:
The coach of the Philadelphia Eagles walks back and forth along the sidelines of Lincoln Financial Field fifteen times in three minutes. What is the frequency of his pacing? Remember to change the time to seconds.
4)What is the mass of an object weighing
3,000N?
Answer:
Explanation:
306.12 Kg,
Answer:
The mass of an object weighing 3000N is 300kg
Explanation:
Here,
Weight (W) = 3000N is given
So,
we will use
W = mg
where,
m = mass of the body
g = acceleration due to gravity
Now,
W = mg
3000 = m × 10
m = 3000 ÷ 10
m = 300kg
Thus, The mass of an object weighing 3000N is 300kg
-TheUnknownScientist
What is the change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on earth? What is it on the moon (g = 1.6 m/s2)?
Answer:
to find the weight, use the following formula
F= m x g
in Earth---> 45 x 9.8= 441 N
in Moon---> 45 x 1.6= 72 N
Explanation:
I HOPE THIS HELPS!!! :)
The change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.
What is Gravitational Potential energy?
Gravitational potential energy is defined as the energy possessed by or acquired by an object due to a change in its position when it is present in a gravitational field. This can be said that gravitational potential energy is the energy which is related to the gravitational force or gravitation.
Gravitational potential energy is expressed as
U=m g h
Where, U = gravitational potential energy
m = mass
g = gravitational field
h = height
For above given example,
The change in gravitational potential energy for Earth
mass= 45kg
Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m
g= [tex]9.8m/s^2[/tex]
U= 45*16*9.8 = 7056J or 7.056kJ
The change in gravitational potential energy for Moon
mass= 45kg
Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m
g= [tex]1.6m/s^2[/tex]
U= 45*16* 1.6= 1152J or 1.152kJ
Thus, the change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.
Learn more about Gravitational potential energy, here:
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a car of mass 1500 kg is moving with the speed of 72 km/ hr (calculated it's kinetic energy)
Answer:
So work require will be 3888×10×10³J
Explanation:
⇒Work done=Change in kinetic energy
⇒KE=1/2mv²
⇒Mass->15000kg
⇒Velocity->72km/h
⇒KE=1/2×15000×(72)²
⇒KE=1/2×15000×5184
⇒KE=7500×5184
⇒KE=3888×10×10³J
