Answer:
Given that the warm water is less dense than the cold water, we have;
The cold water which is more dense than the warm water will remain settled in the lower part of the tub while particles of the less dense warm water will move above the cold water not being able to penetrate lower due of difference in their gravitational potential energiesThis is a case of (lack of) heat transfer due to inability of heat to penetrate into the lower layers and transfer the heat by conduction, from particle to particle, and therefore, one layer, the top remains warm while the other layer, the lower layer, remains coldWith time (over an hour) more and more warm water units will be able to penetrate deeper and make the lower layer warmer while the warm water at the top loses heat by evaporation to the atmosphere, until the entire water reaches equilibriumHeat will continue to be lost by evaporation to the air and by conduction through the porcelain to the steel tub until the water in the tub becomes coldExplanation:
A 3 kg book is at rest on the table. What is the magnitude of the normal force that the table is exerting on the book?
Answer:
30 N
Explanation:
The normal force is the component of a contact force that is perpendicular to the surface that an object contacts. This normal force prevents the surfaces from penetrating each other.
Let us assume that the acceleration due to gravity (g) is 10 m/s². Hence the weight of the book (W) is:
W = mass of book * acceleration due to gravity = 3 kg * 10 m/s² = 30 N
The normal force ([tex]F_n[/tex]) is gotten using:
Summation of vertical force = m[tex]a_y[/tex]
[tex]F_y=ma_y\\\\F_n-mg=0\\\\f_n=mg=3kg(10m/s^2)=30\ N[/tex]
A student uses the circuit shown to determine the resistance of two identical resistors.
H--
А.
V
The voltmeter reading is 2.2V and the ammeter reading is 0.25A.
What is the resistance of each resistor?
A 0.2752
B
0.552
C 4.4Ω
D
8.82
Answer:
B. 0.552
Explanation:
To find the resistance in the circuit above, u simply divide the current in the circuit by the voltage to get the resistance.
If you were capable of converting mass to energy with 100%, efficiency, how much mass would you need to produce 3.5x10^12 Joules of energy?
Answer:
a) 3.9 x 10⁻⁵ kg
Explanation:
The amount of mass required to produce the energy can be given by Einstein's formula:
[tex]E = mc^2\\\\m = \frac{E}{c^2}[/tex]
where,
m = mass required = ?
E = Energy produced = 3.5 x 10¹² J
c = speed of light = 3 x 10⁸ m/s
Therefore,
[tex]m = \frac{3.5\ x\ 10^{12}\ J}{(3\ x\ 10^8\ m/s)^2} \\\\m = 3.9\ x\ 10^{-5}\ kg[/tex]
Hence, the correct option is:
a) 3.9 x 10⁻⁵ kg
A spring with a spring constant of 2.5 N/m is stretched by 0.2 m. What is the potential energy in the spring
Answer:
Explanation:
PE = [tex]\frac{1}{2}k[/tex](Δ[tex]x^2[/tex])
where k is the spring constant and Δx is the displacement of the spring when an object is hung from it. Plugging in:
[tex]PE=\frac{1}{2}(2.5)(.2^2)[/tex] which gives us
PE = .05 J
You have just learned that the planet core of Mars is no longer radiating heat like the core of Earth. With this information what would you communicate to building designers as the lead geologist in regards to suitable building locations on the surface of Mars? Remember your informing builders about locations that would best avoid natural disasters like marsquakes and volcanoes? What evidence or theories do you have to support your statements?
Answer:
Explanation:
That is a fun question!
Without a hot radiating core like Earth, Mars will have very different geological and seismic events. The Mars core will be relatively cold and there will not be any molten magma. So Mars will not have earthquakes or volcano activities. Both only occur when there is magma flowing or tectonic plate motion and they will not occur with a cold core.
a bag of sugar is found to have the same weight on planet earth as an identical bag of dry sawdust on planet Jupiter explain why the masses of the two bags must be different
Answer:
Because Jupiter is a much larger planet than Earth, its gravitational pull is 240% stronger than that of earth. This is why sawdust, which is lighter than its equivalent measure of sugar would weigh more on Jupiter.
Explanation:
Let's assume that a type of bag can contain 50 kilograms of sugar. If that same bag was filled up with sawdust instead, it would weigh far less than 50Kg.
If that bag of sawdust, on earth weighed 35Kg for instance, on Jupiter, the new weight would be:
35Kg x 2.4 = 84Kg
Put differently, Jupiter simply has a stronger gravitational pull than earth. This extra pull is attributed to its size.
Cheers
Please help with this question
Answer:
That's true
Explanation:
I've gotten it right
A voltage source provides ____ required for electric current. A. the electrons B. the potential difference C. the resistance D. the pathway
The distance between two successive crests of a certain transverse wave is 1.40 m. Eight crests (7 waves) pass a given point along the direction of travel every 15.0 s. How fast are the waves traveling
Answer:
the speed of the wave is 0.65 m/s
Explanation:
Given;
distance between two successive crests, λ = 1.4 m
number of crests, n = 8
number of waves formed = 7
The total distance covered by the wave, d= 7λ = 7 x 1.4 = 9.8 m
time of motion of the wave, t = 15 s
The speed of the wave is calculated as;
V = d/t
V = 9.8 / 15
V = 0.65 m/s
Therefore, the speed of the wave is 0.65 m/s
Planets in the solar system revolve around the Sun in an orbital path and can vary from rocky and terrestrial objects to gaseous and liquid object. Which set of characteristics is unique to the outer planets
Answer:
Gaseous; liquid.
Explanation:
A planet can be defined as a large celestial body having sufficient mass to allow for self-gravity and make it assume a nearly circular shape (hydrostatic equilibrium), revolves in an orbit around the Sun in the solar system and has a cleared neighborhood.
Some examples of the planet are Mars, Venus, Earth, Mercury, Neptune, Jupiter, Saturn, Uranus, Pluto, etc.
Basically, the planets are divided into two (2) main categories and these includes;
I. Inner planets: these planets are the closest to the sun and comprises of mercury, venus, earth and mars.
II. Outer planets: these planets are beyond the asteroid belt and comprises of jupiter, saturn, uranus and neptune, from left to right of the solar system.
These outer planets are made mostly of gases (hydrogen and helium) causing them to be less dense than the solid inner planets. These gases are generally known to be less dense in terms of physical properties.
In conclusion, Planets in the solar system can vary from rocky and terrestrial objects to gaseous and liquid object.
However, the set of characteristics which is unique to the outer planets are gaseous and liquid.
A portion size is always equivalent to the serving size listed on the label. A. True B. False
Answer:
Hi, there your answer is False
Explanation:
Do any of y’all know the answer to this? Please help, I’ve been stuck on this question forever
Answer:
I think it's B , maybe wrong tho....
Nathan is walking to the store and sees a snake slithering across the sidewalk. He jumps over it with an initial vertical velocity of 10 ft/s. How long does it take for Nathan to land back on the ground
Answer:
[tex]0.62\:\mathrm{s}[/tex]
Explanation:
Since the universal SI unit for velocity is meters/second, let's convert ft/s to m/s:
[tex]10\:\mathrm{ft/s}=3.048\:\mathrm{m/s}[/tex]
We can use the following kinematics equation to solve this question:
[tex]v_f=v_i+at[/tex]
What we know:
The initial velocity, [tex]v_i[/tex], is [tex]3.048\:\mathrm{m/s}[/tex] (physics concept) The final velocity must be equal in magnitude but opposite in direction to the initial velocity ([tex]v_f=-3.048\:\mathrm{m/s}[/tex]) Acceleration, [tex]a[/tex], is acceleration due to gravity at about [tex]9.8\:\mathrm{m/s}[/tex]Solving for [tex]t[/tex]:
[tex]-3.048=3.048+(-9.8t),\\-6.096=-9.8t,\\t=\frac{-6.096}{-9.8}\approx \boxed{0.62\:\mathrm{s}}[/tex]
Explain why the poles are colder than the tropics.?
A cyclist rides at an average speed of 1.9 m/s for 3h 30min. How many kilometers does he travel
You need to pick up a book off the floor and place it on a tabletop. You do 1.56J of work to lift the book with a force of 300N. What is the distance?
Answer:
Distance = 0.0052 m
Explanation:
Work =1.56J
Force = 300N
Distance = ?
Work=Force*Distance
1.56 J = 300N * Distance
1.56/300 = Distance
0.0052 m = Distance
help me calculate the kinetic energy (just the middle column) ASAP! SHOW WORK! ON PAPER
Answer:
Explanation:
I can tell you what the answers for the middle column are, but if you don't know how to solve total energy problems, they won't make any sense to you at all.
First row, KE = 0
Second row, KE = 220500 J
Third row, KE = 183750 J
Fourth row, KE = 205800 J
That's also not paying any attention to significant digits because your velocity only had 1 and that's not enough to do the problem justice. I left all the digits in the answer. Round how your teacher tells you to.
What wave phenomena best describes the reason for the dark and light bands that
appear on the optical screen during the double slit experiment?
Answer:
Interference
Explanation:
Interference is the phenomenon in which two waves superimpose to form a wave with smaller, larger or same amplitude.
There are two types of interference namely, constructive interference and destructive interference.
Constructive interference occurs when the waves are in phase and destructive interference occurs when the waves are out of phase.
In a double slit experiment, the two slits acts as sources of light and thus the waves combine to produce interference patterns. When the waves are in phase, that is the angle between them is 0°, they form a constructive interference pattern which gives rise to a light band. When the waves are out of phase, that is the angle between them is 180°, they form a destructive interference pattern which gives rise to a dark band.
Note also that diffraction patterns are also observed for wide slits but can be neglected for smaller slits.
a 5 kg block is on a frictionless surface. A 15 N force is applied to the block in a direction parallel to the surface. what is the acceleration of the block?
A. 3 m/s^2
B. 10 m/s^2
C. 20 m/s^2
D. 75 m/s^2
Answer:
D 75
Explanation:
I'm pretty sure it's just 5x15=75
Answer:
the answer would be 3/s^2
Explanation:
because all u have to do is divide 15 by 5 and u would get 3
I NEED HELP PLEASE HELP ME
A 2400 Kg Space Capsule is on the moon. What is its weights on earth ?
Answer:
24000N
Explanation:
The mass of the object stays the same, regardless of its gravitational field strength. But, weight=mass*gravitational field strength.
So, the gravitational field strength on Earth is 10N. 2400*10=24000.
hope this helps
How does a circuit breaker protect a refrigerator?
Answer:
When the circuit breaker trips and turns off, it can shut off power to the appliance. This not only protects your home from damage, but it also protects the appliance itself.
Explanation:
What is a circuit breaker. A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.
Which statement accurately describes the big bang theory? The universe began at an outer boundary and has been collapsing since its formation.
Answer: The statements are missing hence I will give you a summary of what the big bang theory .
answer : The big bang theory explains how the energies of every speck of the universe came together at a point ( very dense point ) and eventually exploded creating the various galaxies we have today
Explanation:
The Big bang theory describes how the Universe and the various galaxies that exist began some billion of years ago, It describes how the energies of every speck of the universe came together at a point ( very dense point ) and eventually exploded creating the various galaxies we have today
Two forces of 8N and 10N CANNOT give a resultant of
a. 1 N
b. 2 N
c. 9 N
d. 18 N
Answer:
Answer is gonna be B. 2N
This is the Answer for your question :3
I hope you are having a great day ❤️❤️❤️❤️
The resultant force is indeed the single force and corresponding tension derived by vector addition when combining any system of torques acting on a solid body.
Its associated torque is generated mostly by the time of filing the compliance.The Pythagorean theorem is being used to determine the resulting force whenever one force acts perpendicularly to another. Calculating the resultant force which not includes force: [tex]\to 10-8= 2\ N[/tex]Therefore, the final answer is "Option b".
Learn more:
brainly.com/question/23869482
Can someone help please
Ans: The velocity of the bobsled at the bottom of the hill is = 57.7 [tex]\frac{m}{s}[/tex]
Explanation: (see image attached)
Hope this helps! Good luck with future work! :)
Sobre un barco, que se mueve en forma rectilínea, y con velocidad constante de 30 [km/h], se mueve un perro en el mismo sentido del barco a una velocidad de 10 [km/h]. Si alguien observa sentado desde la playa, ¿a qué velocidad verá correr al perro sobre la cubierta del barco?
Answer:
El observador verá correr al perro sobre la cubierta del barco a una velocidad de 40 kilómetros por hora.
Explanation:
Para determinar la velocidad del perro con respecto al observador sentado desde la playa a través del concepto de velocidad relativa, descrito en la siguiente fórmula:
[tex]v_{P/B} = v_{P} - v_{B}[/tex] (1)
Donde:
[tex]v_{P/B}[/tex] - Velocidad del perro relativo al barco, en kilómetros por hora.
[tex]v_{P}[/tex] - Velocidad del perro con respecto al observador, en kilómetros por hora.
[tex]v_{B}[/tex] - Velocidad del barco con respecto al observador, en kilómetros por hora.
Si sabemos que [tex]v_{B} = 30\,\frac{km}{h}[/tex] y [tex]v_{P/B} = 10\,\frac{km}{h}[/tex], entonces la velocidad del perro con respecto al observador es:
[tex]v_{P} = v_{B} + v_{P/B}[/tex]
[tex]v_{P} = 30\,\frac{km}{h} + 10\,\frac{km}{h}[/tex]
[tex]v_{P} = 40\,\frac{km}{h}[/tex]
El observador verá correr al perro sobre la cubierta del barco a una velocidad de 40 kilómetros por hora.
Does Anybody Know The Answers?
Answer:
I was going to give you the paper where I saw it but since you are not giving enough points I can not give you so I am only going to give you some of these that are here sorry
Explanation:
1.
[tex]9^{2} + 12^2 = x^2\\81 + 144= x^2\\\sqrt{225} = \sqrt{x} \\ 15=x\\\\ 2.\\x^2+12^2+=13^2\\x^2+144 =169\\x^2 = 25\\\sqrt{x^2 =\sqrt{25\\\\[/tex]
x=5
[tex]3.\\12^2+32^2 = x^2\\34.176= x[/tex]
7.
5,12,13
9.
[tex]\frac{x}{4} ,\frac{12}{4} ,\frac{20}{4}\\\\\frac{x}{4},3,5 \\\\x=16\\\\12. \\x^2 + 48^2=50^2\\\\x^2=196\\x=14[/tex]
22. White noise is ...
a very loud sound
a single frequency at the same time
a very quiet sound
a whole bunch of frequencies at the same ttim
23: what does the law of conservation of energy state?
both of these
neither of these
energy can be created
energy can be destroyed
Answer:
white noise is a bunch of frequencies at the same time :)
Explanation:
HELP PLEASE
A virtual image is produced by a convex mirror that is 1.60 cm from the mirror. If the magnification is 0.20, how far from the mirror is the object?
The distance of the object from the mirror Is = –8 cm
Calculation of the object distance of a mirrorThe image distance from the mirror = –1.60cm
The magnification of the image = 0.20
The distance of the object from the mirror can be calculated using the formula below:
magnification= – image distance/ object distance
Substitute the available values into the equation above,
0.20 = – 1.60/ X
Make X the subject of formula,
X = – 1.60/0.20
X = – 8cm
The negative sign indicates that the image is virtual which is formed behind the mirror.
Therefore, the distance of the object from the mirror Is = –8 cm.
Learn more about mirror equations here:
https://brainly.com/question/26257987
(reply with an answer to the question or get reported) Please solve it with the steps ty
Answer:
vertical force=50
horizontal force=35
Suppose the height of object is +3cm and height of image is -12 cm. What is its magnification?
Answer:
magnification is 4
Explanation:
m= image height / object height
m= 12/3
m= 4